diff options
Diffstat (limited to 'filters/kword/pdf/xpdf/xpdf/Stream.cc')
| -rw-r--r-- | filters/kword/pdf/xpdf/xpdf/Stream.cc | 4544 |
1 files changed, 0 insertions, 4544 deletions
diff --git a/filters/kword/pdf/xpdf/xpdf/Stream.cc b/filters/kword/pdf/xpdf/xpdf/Stream.cc deleted file mode 100644 index 8c997d032..000000000 --- a/filters/kword/pdf/xpdf/xpdf/Stream.cc +++ /dev/null @@ -1,4544 +0,0 @@ -//======================================================================== -// -// Stream.cc -// -// Copyright 1996-2002 Glyph & Cog, LLC -// -//======================================================================== - -#include <aconf.h> - -#ifdef USE_GCC_PRAGMAS -#pragma implementation -#endif - -#include <stdio.h> -#include <stdlib.h> -#include <stddef.h> -#include <limits.h> -#ifndef WIN32 -#include <unistd.h> -#endif -#include <string.h> -#include <ctype.h> -#include "gmem.h" -#include "gfile.h" -#include "xpdf_config.h" -#include "Error.h" -#include "Object.h" -#ifndef NO_DECRYPTION -#include "Decrypt.h" -#endif -#include "Stream.h" -#include "JBIG2Stream.h" -#include "Stream-CCITT.h" - -#ifdef __DJGPP__ -static GBool setDJSYSFLAGS = gFalse; -#endif - -#ifdef VMS -#ifdef __GNUC__ -#define SEEK_SET 0 -#define SEEK_CUR 1 -#define SEEK_END 2 -#endif -#endif - -//------------------------------------------------------------------------ -// Stream (base class) -//------------------------------------------------------------------------ - -Stream::Stream() { - ref = 1; -} - -Stream::~Stream() { -} - -void Stream::close() { -} - -int Stream::getRawChar() { - error(-1, "Internal: called getRawChar() on non-predictor stream"); - return EOF; -} - -char *Stream::getLine(char *buf, int size) { - int i; - int c; - - if (lookChar() == EOF) - return NULL; - for (i = 0; i < size - 1; ++i) { - c = getChar(); - if (c == EOF || c == '\n') - break; - if (c == '\r') { - if ((c = lookChar()) == '\n') - getChar(); - break; - } - buf[i] = c; - } - buf[i] = '\0'; - return buf; -} - -GString *Stream::getPSFilter(const char */*indent*/) { - return new GString(); -} - -Stream *Stream::addFilters(Object *dict) { - Object obj, obj2; - Object params, params2; - Stream *str; - int i; - - str = this; - dict->dictLookup("Filter", &obj); - if (obj.isNull()) { - obj.free(); - dict->dictLookup("F", &obj); - } - dict->dictLookup("DecodeParms", ¶ms); - if (params.isNull()) { - params.free(); - dict->dictLookup("DP", ¶ms); - } - if (obj.isName()) { - str = makeFilter(obj.getName(), str, ¶ms); - } else if (obj.isArray()) { - for (i = 0; i < obj.arrayGetLength(); ++i) { - obj.arrayGet(i, &obj2); - if (params.isArray()) - params.arrayGet(i, ¶ms2); - else - params2.initNull(); - if (obj2.isName()) { - str = makeFilter(obj2.getName(), str, ¶ms2); - } else { - error(getPos(), "Bad filter name"); - str = new EOFStream(str); - } - obj2.free(); - params2.free(); - } - } else if (!obj.isNull()) { - error(getPos(), "Bad 'Filter' attribute in stream"); - } - obj.free(); - params.free(); - - return str; -} - -Stream *Stream::makeFilter(const char *name, Stream *str, Object *params) { - int pred; // parameters - int colors; - int bits; - int early; - int encoding; - GBool endOfLine, byteAlign, endOfBlock, black; - int columns, rows; - Object globals, obj; - - if (!strcmp(name, "ASCIIHexDecode") || !strcmp(name, "AHx")) { - str = new ASCIIHexStream(str); - } else if (!strcmp(name, "ASCII85Decode") || !strcmp(name, "A85")) { - str = new ASCII85Stream(str); - } else if (!strcmp(name, "LZWDecode") || !strcmp(name, "LZW")) { - pred = 1; - columns = 1; - colors = 1; - bits = 8; - early = 1; - if (params->isDict()) { - params->dictLookup("Predictor", &obj); - if (obj.isInt()) - pred = obj.getInt(); - obj.free(); - params->dictLookup("Columns", &obj); - if (obj.isInt()) - columns = obj.getInt(); - obj.free(); - params->dictLookup("Colors", &obj); - if (obj.isInt()) - colors = obj.getInt(); - obj.free(); - params->dictLookup("BitsPerComponent", &obj); - if (obj.isInt()) - bits = obj.getInt(); - obj.free(); - params->dictLookup("EarlyChange", &obj); - if (obj.isInt()) - early = obj.getInt(); - obj.free(); - } - str = new LZWStream(str, pred, columns, colors, bits, early); - } else if (!strcmp(name, "RunLengthDecode") || !strcmp(name, "RL")) { - str = new RunLengthStream(str); - } else if (!strcmp(name, "CCITTFaxDecode") || !strcmp(name, "CCF")) { - encoding = 0; - endOfLine = gFalse; - byteAlign = gFalse; - columns = 1728; - rows = 0; - endOfBlock = gTrue; - black = gFalse; - if (params->isDict()) { - params->dictLookup("K", &obj); - if (obj.isInt()) { - encoding = obj.getInt(); - } - obj.free(); - params->dictLookup("EndOfLine", &obj); - if (obj.isBool()) { - endOfLine = obj.getBool(); - } - obj.free(); - params->dictLookup("EncodedByteAlign", &obj); - if (obj.isBool()) { - byteAlign = obj.getBool(); - } - obj.free(); - params->dictLookup("Columns", &obj); - if (obj.isInt()) { - columns = obj.getInt(); - } - obj.free(); - params->dictLookup("Rows", &obj); - if (obj.isInt()) { - rows = obj.getInt(); - } - obj.free(); - params->dictLookup("EndOfBlock", &obj); - if (obj.isBool()) { - endOfBlock = obj.getBool(); - } - obj.free(); - params->dictLookup("BlackIs1", &obj); - if (obj.isBool()) { - black = obj.getBool(); - } - obj.free(); - } - str = new CCITTFaxStream(str, encoding, endOfLine, byteAlign, - columns, rows, endOfBlock, black); - } else if (!strcmp(name, "DCTDecode") || !strcmp(name, "DCT")) { - str = new DCTStream(str); - } else if (!strcmp(name, "FlateDecode") || !strcmp(name, "Fl")) { - pred = 1; - columns = 1; - colors = 1; - bits = 8; - if (params->isDict()) { - params->dictLookup("Predictor", &obj); - if (obj.isInt()) - pred = obj.getInt(); - obj.free(); - params->dictLookup("Columns", &obj); - if (obj.isInt()) - columns = obj.getInt(); - obj.free(); - params->dictLookup("Colors", &obj); - if (obj.isInt()) - colors = obj.getInt(); - obj.free(); - params->dictLookup("BitsPerComponent", &obj); - if (obj.isInt()) - bits = obj.getInt(); - obj.free(); - } - str = new FlateStream(str, pred, columns, colors, bits); - } else if (!strcmp(name, "JBIG2Decode")) { - if (params->isDict()) { - params->dictLookup("JBIG2Globals", &globals); - } - str = new JBIG2Stream(str, &globals); - globals.free(); - } else { - error(getPos(), "Unknown filter '%s'", name); - str = new EOFStream(str); - } - return str; -} - -//------------------------------------------------------------------------ -// BaseStream -//------------------------------------------------------------------------ - -BaseStream::BaseStream(Object *dictA) { - dict = *dictA; -#ifndef NO_DECRYPTION - decrypt = NULL; -#endif -} - -BaseStream::~BaseStream() { - dict.free(); -#ifndef NO_DECRYPTION - if (decrypt) - delete decrypt; -#endif -} - -#ifndef NO_DECRYPTION -void BaseStream::doDecryption(Guchar *fileKey, int keyLength, - int objNum, int objGen) { - decrypt = new Decrypt(fileKey, keyLength, objNum, objGen); -} -#endif - -//------------------------------------------------------------------------ -// FilterStream -//------------------------------------------------------------------------ - -FilterStream::FilterStream(Stream *strA) { - str = strA; -} - -FilterStream::~FilterStream() { -} - -void FilterStream::close() { - str->close(); -} - -void FilterStream::setPos(Guint /*pos*/, int /*dir*/) { - error(-1, "Internal: called setPos() on FilterStream"); -} - -//------------------------------------------------------------------------ -// ImageStream -//------------------------------------------------------------------------ - -ImageStream::ImageStream(Stream *strA, int widthA, int nCompsA, int nBitsA) { - int imgLineSize; - - str = strA; - width = widthA; - nComps = nCompsA; - nBits = nBitsA; - - nVals = width * nComps; - if (nBits == 1) { - imgLineSize = (nVals + 7) & ~7; - } else { - imgLineSize = nVals; - } - imgLine = (Guchar *)gmalloc(imgLineSize * sizeof(Guchar)); - imgIdx = nVals; -} - -ImageStream::~ImageStream() { - gfree(imgLine); -} - -void ImageStream::reset() { - str->reset(); -} - -GBool ImageStream::getPixel(Guchar *pix) { - int i; - - if (imgIdx >= nVals) { - getLine(); - imgIdx = 0; - } - for (i = 0; i < nComps; ++i) { - pix[i] = imgLine[imgIdx++]; - } - return gTrue; -} - -Guchar *ImageStream::getLine() { - Gulong buf, bitMask; - int bits; - int c; - int i; - - if (nBits == 1) { - for (i = 0; i < nVals; i += 8) { - c = str->getChar(); - imgLine[i+0] = (Guchar)((c >> 7) & 1); - imgLine[i+1] = (Guchar)((c >> 6) & 1); - imgLine[i+2] = (Guchar)((c >> 5) & 1); - imgLine[i+3] = (Guchar)((c >> 4) & 1); - imgLine[i+4] = (Guchar)((c >> 3) & 1); - imgLine[i+5] = (Guchar)((c >> 2) & 1); - imgLine[i+6] = (Guchar)((c >> 1) & 1); - imgLine[i+7] = (Guchar)(c & 1); - } - } else if (nBits == 8) { - for (i = 0; i < nVals; ++i) { - imgLine[i] = str->getChar(); - } - } else { - bitMask = (1 << nBits) - 1; - buf = 0; - bits = 0; - for (i = 0; i < nVals; ++i) { - if (bits < nBits) { - buf = (buf << 8) | (str->getChar() & 0xff); - bits += 8; - } - imgLine[i] = (Guchar)((buf >> (bits - nBits)) & bitMask); - bits -= nBits; - } - } - return imgLine; -} - -void ImageStream::skipLine() { - int n, i; - - n = (nVals * nBits + 7) >> 3; - for (i = 0; i < n; ++i) { - str->getChar(); - } -} - -//------------------------------------------------------------------------ -// StreamPredictor -//------------------------------------------------------------------------ - -StreamPredictor::StreamPredictor(Stream *strA, int predictorA, - int widthA, int nCompsA, int nBitsA) { - str = strA; - predictor = predictorA; - width = widthA; - nComps = nCompsA; - nBits = nBitsA; - predLine = NULL; - ok = gFalse; - - nVals = width * nComps; - pixBytes = (nComps * nBits + 7) >> 3; - rowBytes = ((nVals * nBits + 7) >> 3) + pixBytes; - if (width <= 0 || nComps <= 0 || nBits <= 0 || - nComps > 4 || - nBits > 16 || - width >= INT_MAX / nComps || // check for overflow in nVals - nVals >= (INT_MAX - 7) / nBits) // check for overflow in rowBytes - return; - - predLine = (Guchar *)gmalloc(rowBytes); - memset(predLine, 0, rowBytes); - predIdx = rowBytes; - - ok = gTrue; -} - -StreamPredictor::~StreamPredictor() { - gfree(predLine); -} - -int StreamPredictor::lookChar() { - if (predIdx >= rowBytes) { - if (!getNextLine()) { - return EOF; - } - } - return predLine[predIdx]; -} - -int StreamPredictor::getChar() { - if (predIdx >= rowBytes) { - if (!getNextLine()) { - return EOF; - } - } - return predLine[predIdx++]; -} - -GBool StreamPredictor::getNextLine() { - int curPred; - Guchar upLeftBuf[4]; - int left, up, upLeft, p, pa, pb, pc; - int c; - Gulong inBuf, outBuf, bitMask; - int inBits, outBits; - int i, j, k; - - // get PNG optimum predictor number - if (predictor == 15) { - if ((curPred = str->getRawChar()) == EOF) { - return gFalse; - } - curPred += 10; - } else { - curPred = predictor; - } - - // read the raw line, apply PNG (byte) predictor - upLeftBuf[0] = upLeftBuf[1] = upLeftBuf[2] = upLeftBuf[3] = 0; - for (i = pixBytes; i < rowBytes; ++i) { - upLeftBuf[3] = upLeftBuf[2]; - upLeftBuf[2] = upLeftBuf[1]; - upLeftBuf[1] = upLeftBuf[0]; - upLeftBuf[0] = predLine[i]; - if ((c = str->getRawChar()) == EOF) { - break; - } - switch (curPred) { - case 11: // PNG sub - predLine[i] = predLine[i - pixBytes] + (Guchar)c; - break; - case 12: // PNG up - predLine[i] = predLine[i] + (Guchar)c; - break; - case 13: // PNG average - predLine[i] = ((predLine[i - pixBytes] + predLine[i]) >> 1) + - (Guchar)c; - break; - case 14: // PNG Paeth - left = predLine[i - pixBytes]; - up = predLine[i]; - upLeft = upLeftBuf[pixBytes]; - p = left + up - upLeft; - if ((pa = p - left) < 0) - pa = -pa; - if ((pb = p - up) < 0) - pb = -pb; - if ((pc = p - upLeft) < 0) - pc = -pc; - if (pa <= pb && pa <= pc) - predLine[i] = left + (Guchar)c; - else if (pb <= pc) - predLine[i] = up + (Guchar)c; - else - predLine[i] = upLeft + (Guchar)c; - break; - case 10: // PNG none - default: // no predictor or TIFF predictor - predLine[i] = (Guchar)c; - break; - } - } - - // apply TIFF (component) predictor - //~ this is completely untested - if (predictor == 2) { - if (nBits == 1) { - inBuf = predLine[pixBytes - 1]; - for (i = pixBytes; i < rowBytes; i += 8) { - // 1-bit add is just xor - inBuf = (inBuf << 8) | predLine[i]; - predLine[i] ^= inBuf >> nComps; - } - } else if (nBits == 8) { - for (i = pixBytes; i < rowBytes; ++i) { - predLine[i] += predLine[i - nComps]; - } - } else { - upLeftBuf[0] = upLeftBuf[1] = upLeftBuf[2] = upLeftBuf[3] = 0; - bitMask = (1 << nBits) - 1; - inBuf = outBuf = 0; - inBits = outBits = 0; - j = k = pixBytes; - for (i = 0; i < nVals; ++i) { - if (inBits < nBits) { - inBuf = (inBuf << 8) | (predLine[j++] & 0xff); - inBits += 8; - } - upLeftBuf[3] = upLeftBuf[2]; - upLeftBuf[2] = upLeftBuf[1]; - upLeftBuf[1] = upLeftBuf[0]; - upLeftBuf[0] = (upLeftBuf[nComps] + - (inBuf >> (inBits - nBits))) & bitMask; - outBuf = (outBuf << nBits) | upLeftBuf[0]; - inBits -= nBits; - outBits += nBits; - if (outBits > 8) { - predLine[k++] = (Guchar)(outBuf >> (outBits - 8)); - } - } - if (outBits > 0) { - predLine[k++] = (Guchar)(outBuf << (8 - outBits)); - } - } - } - - // reset to start of line - predIdx = pixBytes; - - return gTrue; -} - -//------------------------------------------------------------------------ -// FileStream -//------------------------------------------------------------------------ - -FileStream::FileStream(FILE *fA, Guint startA, GBool limitedA, - Guint lengthA, Object *dictA): - BaseStream(dictA) { - f = fA; - start = startA; - limited = limitedA; - length = lengthA; - bufPtr = bufEnd = buf; - bufPos = start; - savePos = 0; - saved = gFalse; -} - -FileStream::~FileStream() { - close(); -} - -Stream *FileStream::makeSubStream(Guint startA, GBool limitedA, - Guint lengthA, Object *dictA) { - return new FileStream(f, startA, limitedA, lengthA, dictA); -} - -void FileStream::reset() { -#ifdef HAVE_FSEEKO - savePos = (Guint)ftello(f); - fseeko(f, start, SEEK_SET); -#elif defined(HAVE_FSEEK64) && defined(HAVE_FTELL64) - savePos = (Guint)ftell64(f); - fseek64(f, start, SEEK_SET); -#else - savePos = (Guint)ftell(f); - fseek(f, start, SEEK_SET); -#endif - saved = gTrue; - bufPtr = bufEnd = buf; - bufPos = start; -#ifndef NO_DECRYPTION - if (decrypt) - decrypt->reset(); -#endif -} - -void FileStream::close() { - if (saved) { -#ifdef HAVE_FSEEKO - fseeko(f, savePos, SEEK_SET); -#elif defined(HAVE_FSEEK64) && defined(HAVE_FTELL64) - fseek64(f, savePos, SEEK_SET); -#else - fseek(f, savePos, SEEK_SET); -#endif - saved = gFalse; - } -} - -GBool FileStream::fillBuf() { - int n; -#ifndef NO_DECRYPTION - char *p; -#endif - - bufPos += bufEnd - buf; - bufPtr = bufEnd = buf; - if (limited && bufPos >= start + length) { - return gFalse; - } - if (limited && bufPos + fileStreamBufSize > start + length) { - n = start + length - bufPos; - } else { - n = fileStreamBufSize; - } - n = fread(buf, 1, n, f); - bufEnd = buf + n; - if (bufPtr >= bufEnd) { - return gFalse; - } -#ifndef NO_DECRYPTION - if (decrypt) { - for (p = buf; p < bufEnd; ++p) { - *p = (char)decrypt->decryptByte((Guchar)*p); - } - } -#endif - return gTrue; -} - -void FileStream::setPos(Guint pos, int dir) { - Guint size; - - if (dir >= 0) { -#ifdef HAVE_FSEEKO - fseeko(f, pos, SEEK_SET); -#elif defined(HAVE_FSEEK64) && defined(HAVE_FTELL64) - fseek64(f, pos, SEEK_SET); -#else - fseek(f, pos, SEEK_SET); -#endif - bufPos = pos; - } else { -#ifdef HAVE_FSEEKO - fseeko(f, 0, SEEK_END); - size = (Guint)ftello(f); -#elif defined(HAVE_FSEEK64) && defined(HAVE_FTELL64) - fseek64(f, 0, SEEK_END); - size = (Guint)ftell64(f); -#else - fseek(f, 0, SEEK_END); - size = (Guint)ftell(f); -#endif - if (pos > size) - pos = (Guint)size; -#ifdef __CYGWIN32__ - //~ work around a bug in cygwin's implementation of fseek - rewind(f); -#endif -#ifdef HAVE_FSEEKO - fseeko(f, -(int)pos, SEEK_END); - bufPos = (Guint)ftello(f); -#elif defined(HAVE_FSEEK64) && defined(HAVE_FTELL64) - fseek64(f, -(int)pos, SEEK_END); - bufPos = (Guint)ftell64(f); -#else - fseek(f, -(int)pos, SEEK_END); - bufPos = (Guint)ftell(f); -#endif - } - bufPtr = bufEnd = buf; -} - -void FileStream::moveStart(int delta) { - start += delta; - bufPtr = bufEnd = buf; - bufPos = start; -} - -//------------------------------------------------------------------------ -// MemStream -//------------------------------------------------------------------------ - -MemStream::MemStream(char *bufA, Guint lengthA, Object *dictA): - BaseStream(dictA) { - buf = bufA; - needFree = gFalse; - length = lengthA; - bufEnd = buf + length; - bufPtr = buf; -} - -MemStream::~MemStream() { - if (needFree) { - gfree(buf); - } -} - -Stream *MemStream::makeSubStream(Guint start, GBool limited, - Guint lengthA, Object *dictA) { - Guint newLength; - - if (!limited || start + lengthA > length) { - newLength = length - start; - } else { - newLength = lengthA; - } - return new MemStream(buf + start, newLength, dictA); -} - -void MemStream::reset() { - bufPtr = buf; -#ifndef NO_DECRYPTION - if (decrypt) { - decrypt->reset(); - } -#endif -} - -void MemStream::close() { -} - -void MemStream::setPos(Guint pos, int dir) { - if (dir >= 0) { - if (pos > length) { - bufPtr = bufEnd; - } else { - bufPtr = buf + pos; - } - } else { - if (pos > length) { - bufPtr = buf; - } else { - bufPtr = bufEnd - pos; - } - } -} - -void MemStream::moveStart(int delta) { - buf += delta; - bufPtr = buf; -} - -#ifndef NO_DECRYPTION -void MemStream::doDecryption(Guchar *fileKey, int keyLength, - int objNum, int objGen) { - char *newBuf; - char *p, *q; - - this->BaseStream::doDecryption(fileKey, keyLength, objNum, objGen); - if (decrypt) { - newBuf = (char *)gmalloc(bufEnd - buf); - for (p = buf, q = newBuf; p < bufEnd; ++p, ++q) { - *q = (char)decrypt->decryptByte((Guchar)*p); - } - bufEnd = newBuf + (bufEnd - buf); - bufPtr = newBuf + (bufPtr - buf); - buf = newBuf; - needFree = gTrue; - } -} -#endif - -//------------------------------------------------------------------------ -// EmbedStream -//------------------------------------------------------------------------ - -EmbedStream::EmbedStream(Stream *strA, Object *dictA): - BaseStream(dictA) { - str = strA; -} - -EmbedStream::~EmbedStream() { -} - -Stream *EmbedStream::makeSubStream(Guint /*start*/, GBool /*limited*/, - Guint /*length*/, Object */*dictA*/) { - error(-1, "Internal: called makeSubStream() on EmbedStream"); - return NULL; -} - -void EmbedStream::setPos(Guint /*pos*/, int /*dir*/) { - error(-1, "Internal: called setPos() on EmbedStream"); -} - -Guint EmbedStream::getStart() { - error(-1, "Internal: called getStart() on EmbedStream"); - return 0; -} - -void EmbedStream::moveStart(int /*delta*/) { - error(-1, "Internal: called moveStart() on EmbedStream"); -} - -//------------------------------------------------------------------------ -// ASCIIHexStream -//------------------------------------------------------------------------ - -ASCIIHexStream::ASCIIHexStream(Stream *strA): - FilterStream(strA) { - buf = EOF; - eof = gFalse; -} - -ASCIIHexStream::~ASCIIHexStream() { - delete str; -} - -void ASCIIHexStream::reset() { - str->reset(); - buf = EOF; - eof = gFalse; -} - -int ASCIIHexStream::lookChar() { - int c1, c2, x; - - if (buf != EOF) - return buf; - if (eof) { - buf = EOF; - return EOF; - } - do { - c1 = str->getChar(); - } while (isspace(c1)); - if (c1 == '>') { - eof = gTrue; - buf = EOF; - return buf; - } - do { - c2 = str->getChar(); - } while (isspace(c2)); - if (c2 == '>') { - eof = gTrue; - c2 = '0'; - } - if (c1 >= '0' && c1 <= '9') { - x = (c1 - '0') << 4; - } else if (c1 >= 'A' && c1 <= 'F') { - x = (c1 - 'A' + 10) << 4; - } else if (c1 >= 'a' && c1 <= 'f') { - x = (c1 - 'a' + 10) << 4; - } else if (c1 == EOF) { - eof = gTrue; - x = 0; - } else { - error(getPos(), "Illegal character <%02x> in ASCIIHex stream", c1); - x = 0; - } - if (c2 >= '0' && c2 <= '9') { - x += c2 - '0'; - } else if (c2 >= 'A' && c2 <= 'F') { - x += c2 - 'A' + 10; - } else if (c2 >= 'a' && c2 <= 'f') { - x += c2 - 'a' + 10; - } else if (c2 == EOF) { - eof = gTrue; - x = 0; - } else { - error(getPos(), "Illegal character <%02x> in ASCIIHex stream", c2); - } - buf = x & 0xff; - return buf; -} - -GString *ASCIIHexStream::getPSFilter(const char *indent) { - GString *s; - - if (!(s = str->getPSFilter(indent))) { - return NULL; - } - s->append(indent)->append("/ASCIIHexDecode filter\n"); - return s; -} - -GBool ASCIIHexStream::isBinary(GBool /*last*/) { - return str->isBinary(gFalse); -} - -//------------------------------------------------------------------------ -// ASCII85Stream -//------------------------------------------------------------------------ - -ASCII85Stream::ASCII85Stream(Stream *strA): - FilterStream(strA) { - index = n = 0; - eof = gFalse; -} - -ASCII85Stream::~ASCII85Stream() { - delete str; -} - -void ASCII85Stream::reset() { - str->reset(); - index = n = 0; - eof = gFalse; -} - -int ASCII85Stream::lookChar() { - int k; - Gulong t; - - if (index >= n) { - if (eof) - return EOF; - index = 0; - do { - c[0] = str->getChar(); - } while (c[0] == '\n' || c[0] == '\r'); - if (c[0] == '~' || c[0] == EOF) { - eof = gTrue; - n = 0; - return EOF; - } else if (c[0] == 'z') { - b[0] = b[1] = b[2] = b[3] = 0; - n = 4; - } else { - for (k = 1; k < 5; ++k) { - do { - c[k] = str->getChar(); - } while (c[k] == '\n' || c[k] == '\r'); - if (c[k] == '~' || c[k] == EOF) - break; - } - n = k - 1; - if (k < 5 && (c[k] == '~' || c[k] == EOF)) { - for (++k; k < 5; ++k) - c[k] = 0x21 + 84; - eof = gTrue; - } - t = 0; - for (k = 0; k < 5; ++k) - t = t * 85 + (c[k] - 0x21); - for (k = 3; k >= 0; --k) { - b[k] = (int)(t & 0xff); - t >>= 8; - } - } - } - return b[index]; -} - -GString *ASCII85Stream::getPSFilter(const char *indent) { - GString *s; - - if (!(s = str->getPSFilter(indent))) { - return NULL; - } - s->append(indent)->append("/ASCII85Decode filter\n"); - return s; -} - -GBool ASCII85Stream::isBinary(GBool /*last*/) { - return str->isBinary(gFalse); -} - -//------------------------------------------------------------------------ -// LZWStream -//------------------------------------------------------------------------ - -LZWStream::LZWStream(Stream *strA, int predictor, int columns, int colors, - int bits, int earlyA): - FilterStream(strA) { - if (predictor != 1) { - pred = new StreamPredictor(this, predictor, columns, colors, bits); - if ( !pred->isOk()) { - delete pred; - pred = NULL; - } - } else { - pred = NULL; - } - early = earlyA; - eof = gFalse; - inputBits = 0; - clearTable(); -} - -LZWStream::~LZWStream() { - if (pred) { - delete pred; - } - delete str; -} - -int LZWStream::getChar() { - if (pred) { - return pred->getChar(); - } - if (eof) { - return EOF; - } - if (seqIndex >= seqLength) { - if (!processNextCode()) { - return EOF; - } - } - return seqBuf[seqIndex++]; -} - -int LZWStream::lookChar() { - if (pred) { - return pred->lookChar(); - } - if (eof) { - return EOF; - } - if (seqIndex >= seqLength) { - if (!processNextCode()) { - return EOF; - } - } - return seqBuf[seqIndex]; -} - -int LZWStream::getRawChar() { - if (eof) { - return EOF; - } - if (seqIndex >= seqLength) { - if (!processNextCode()) { - return EOF; - } - } - return seqBuf[seqIndex++]; -} - -void LZWStream::reset() { - str->reset(); - eof = gFalse; - inputBits = 0; - clearTable(); -} - -GBool LZWStream::processNextCode() { - int code; - int nextLength; - int i, j; - - // check for EOF - if (eof) { - return gFalse; - } - - // check for eod and clear-table codes - start: - code = getCode(); - if (code == EOF || code == 257) { - eof = gTrue; - return gFalse; - } - if (code == 256) { - clearTable(); - goto start; - } - if (nextCode >= 4097) { - error(getPos(), "Bad LZW stream - expected clear-table code"); - clearTable(); - } - - // process the next code - nextLength = seqLength + 1; - if (code < 256) { - seqBuf[0] = code; - seqLength = 1; - } else if (code < nextCode) { - seqLength = table[code].length; - for (i = seqLength - 1, j = code; i > 0; --i) { - seqBuf[i] = table[j].tail; - j = table[j].head; - } - seqBuf[0] = j; - } else if (code == nextCode) { - seqBuf[seqLength] = newChar; - ++seqLength; - } else { - error(getPos(), "Bad LZW stream - unexpected code"); - eof = gTrue; - return gFalse; - } - newChar = seqBuf[0]; - if (first) { - first = gFalse; - } else { - table[nextCode].length = nextLength; - table[nextCode].head = prevCode; - table[nextCode].tail = newChar; - ++nextCode; - if (nextCode + early == 512) - nextBits = 10; - else if (nextCode + early == 1024) - nextBits = 11; - else if (nextCode + early == 2048) - nextBits = 12; - } - prevCode = code; - - // reset buffer - seqIndex = 0; - - return gTrue; -} - -void LZWStream::clearTable() { - nextCode = 258; - nextBits = 9; - seqIndex = seqLength = 0; - first = gTrue; -} - -int LZWStream::getCode() { - int c; - int code; - - while (inputBits < nextBits) { - if ((c = str->getChar()) == EOF) - return EOF; - inputBuf = (inputBuf << 8) | (c & 0xff); - inputBits += 8; - } - code = (inputBuf >> (inputBits - nextBits)) & ((1 << nextBits) - 1); - inputBits -= nextBits; - return code; -} - -GString *LZWStream::getPSFilter(const char *indent) { - GString *s; - - if (pred) { - return NULL; - } - if (!(s = str->getPSFilter(indent))) { - return NULL; - } - s->append(indent)->append("/LZWDecode filter\n"); - return s; -} - -GBool LZWStream::isBinary(GBool /*last*/) { - return str->isBinary(gTrue); -} - -//------------------------------------------------------------------------ -// RunLengthStream -//------------------------------------------------------------------------ - -RunLengthStream::RunLengthStream(Stream *strA): - FilterStream(strA) { - bufPtr = bufEnd = buf; - eof = gFalse; -} - -RunLengthStream::~RunLengthStream() { - delete str; -} - -void RunLengthStream::reset() { - str->reset(); - bufPtr = bufEnd = buf; - eof = gFalse; -} - -GString *RunLengthStream::getPSFilter(const char *indent) { - GString *s; - - if (!(s = str->getPSFilter(indent))) { - return NULL; - } - s->append(indent)->append("/RunLengthDecode filter\n"); - return s; -} - -GBool RunLengthStream::isBinary(GBool /*last*/) { - return str->isBinary(gTrue); -} - -GBool RunLengthStream::fillBuf() { - int c; - int n, i; - - if (eof) - return gFalse; - c = str->getChar(); - if (c == 0x80 || c == EOF) { - eof = gTrue; - return gFalse; - } - if (c < 0x80) { - n = c + 1; - for (i = 0; i < n; ++i) - buf[i] = (char)str->getChar(); - } else { - n = 0x101 - c; - c = str->getChar(); - for (i = 0; i < n; ++i) - buf[i] = (char)c; - } - bufPtr = buf; - bufEnd = buf + n; - return gTrue; -} - -//------------------------------------------------------------------------ -// CCITTFaxStream -//------------------------------------------------------------------------ - -#if 0 -CCITTFaxStream::CCITTFaxStream(Stream *strA, int encodingA, GBool endOfLineA, - GBool byteAlignA, int columnsA, int rowsA, - GBool endOfBlockA, GBool blackA): - FilterStream(strA) { - encoding = encodingA; - endOfLine = endOfLineA; - byteAlign = byteAlignA; - columns = columnsA; - if (columns < 1 || columns >= INT_MAX / sizeof(short)) { - error(-1, "invalid number of columns"); - exit(1); - } - rows = rowsA; - endOfBlock = endOfBlockA; - black = blackA; - refLine = (short *)gmalloc((columns + 3) * sizeof(short)); - codingLine = (short *)gmalloc((columns + 2) * sizeof(short)); - - eof = gFalse; - row = 0; - nextLine2D = encoding < 0; - inputBits = 0; - codingLine[0] = 0; - codingLine[1] = refLine[2] = columns; - a0 = 1; - - buf = EOF; -} - -CCITTFaxStream::~CCITTFaxStream() { - delete str; - gfree(refLine); - gfree(codingLine); -} - -void CCITTFaxStream::reset() { - int n; - - str->reset(); - eof = gFalse; - row = 0; - nextLine2D = encoding < 0; - inputBits = 0; - codingLine[0] = 0; - codingLine[1] = refLine[2] = columns; - a0 = 1; - buf = EOF; - - // get initial end-of-line marker and 2D encoding tag - if (endOfBlock) { - if (lookBits(12) == 0x001) { - eatBits(12); - } - } else { - for (n = 0; n < 11 && lookBits(n) == 0; ++n) ; - if (n == 11 && lookBits(12) == 0x001) { - eatBits(12); - } - } - if (encoding > 0) { - nextLine2D = !lookBits(1); - eatBits(1); - } -} - -int CCITTFaxStream::lookChar() { - short code1, code2, code3; - int a0New; -#if 0 - GBool err; -#endif - GBool gotEOL; - int ret; - int bits, i; - - // if at eof just return EOF - if (eof && codingLine[a0] >= columns) { - return EOF; - } - - // read the next row -#if 0 - err = gFalse; -#endif - if (codingLine[a0] >= columns) { - - // 2-D encoding - if (nextLine2D) { - for (i = 0; codingLine[i] < columns; ++i) - refLine[i] = codingLine[i]; - refLine[i] = refLine[i + 1] = columns; - b1 = 1; - a0New = codingLine[a0 = 0] = 0; - do { - code1 = getTwoDimCode(); - switch (code1) { - case twoDimPass: - if (refLine[b1] < columns) { - a0New = refLine[b1 + 1]; - b1 += 2; - } - break; - case twoDimHoriz: - if ((a0 & 1) == 0) { - code1 = code2 = 0; - do { - code1 += code3 = getWhiteCode(); - } while (code3 >= 64); - do { - code2 += code3 = getBlackCode(); - } while (code3 >= 64); - } else { - code1 = code2 = 0; - do { - code1 += code3 = getBlackCode(); - } while (code3 >= 64); - do { - code2 += code3 = getWhiteCode(); - } while (code3 >= 64); - } - codingLine[a0 + 1] = a0New + code1; - ++a0; - a0New = codingLine[a0 + 1] = codingLine[a0] + code2; - ++a0; - while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) - b1 += 2; - break; - case twoDimVert0: - a0New = codingLine[++a0] = refLine[b1]; - if (refLine[b1] < columns) { - ++b1; - while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) - b1 += 2; - } - break; - case twoDimVertR1: - a0New = codingLine[++a0] = refLine[b1] + 1; - if (refLine[b1] < columns) { - ++b1; - while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) - b1 += 2; - } - break; - case twoDimVertL1: - a0New = codingLine[++a0] = refLine[b1] - 1; - --b1; - while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) - b1 += 2; - break; - case twoDimVertR2: - a0New = codingLine[++a0] = refLine[b1] + 2; - if (refLine[b1] < columns) { - ++b1; - while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) - b1 += 2; - } - break; - case twoDimVertL2: - a0New = codingLine[++a0] = refLine[b1] - 2; - --b1; - while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) - b1 += 2; - break; - case twoDimVertR3: - a0New = codingLine[++a0] = refLine[b1] + 3; - if (refLine[b1] < columns) { - ++b1; - while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) - b1 += 2; - } - break; - case twoDimVertL3: - a0New = codingLine[++a0] = refLine[b1] - 3; - --b1; - while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) - b1 += 2; - break; - case EOF: - eof = gTrue; - codingLine[a0 = 0] = columns; - return EOF; - default: - error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1); -#if 0 - err = gTrue; - break; -#else - eof = gTrue; - return EOF; -#endif - } - } while (codingLine[a0] < columns); - - // 1-D encoding - } else { - codingLine[a0 = 0] = 0; - while (1) { - code1 = 0; - do { - code1 += code3 = getWhiteCode(); - } while (code3 >= 64); - codingLine[a0+1] = codingLine[a0] + code1; - ++a0; - if (codingLine[a0] >= columns) - break; - code2 = 0; - do { - code2 += code3 = getBlackCode(); - } while (code3 >= 64); - codingLine[a0+1] = codingLine[a0] + code2; - ++a0; - if (codingLine[a0] >= columns) - break; - } - } - - if (codingLine[a0] != columns) { - error(getPos(), "CCITTFax row is wrong length (%d)", codingLine[a0]); -#if 0 - err = gTrue; -#endif - } - - // byte-align the row - if (byteAlign) { - inputBits &= ~7; - } - - // check for end-of-line marker, skipping over any extra zero bits - gotEOL = gFalse; - if (!endOfBlock && row == rows - 1) { - eof = gTrue; - } else { - code1 = lookBits(12); - while (code1 == 0) { - eatBits(1); - code1 = lookBits(12); - } - if (code1 == 0x001) { - eatBits(12); - gotEOL = gTrue; - } else if (code1 == EOF) { - eof = gTrue; - } - } - - // get 2D encoding tag - if (!eof && encoding > 0) { - nextLine2D = !lookBits(1); - eatBits(1); - } - - // check for end-of-block marker - if (endOfBlock && gotEOL) { - code1 = lookBits(12); - if (code1 == 0x001) { - eatBits(12); - if (encoding > 0) { - lookBits(1); - eatBits(1); - } - if (encoding >= 0) { - for (i = 0; i < 4; ++i) { - code1 = lookBits(12); - if (code1 != 0x001) { - error(getPos(), "Bad RTC code in CCITTFax stream"); - } - eatBits(12); - if (encoding > 0) { - lookBits(1); - eatBits(1); - } - } - } - eof = gTrue; - } - } - -#if 0 - // This looks for an end-of-line marker after an error, however - // some (most?) CCITT streams in PDF files don't use end-of-line - // markers, and the just-plow-on technique works better in those - // cases. - else if (err) { - do { - if (code1 == EOF) { - eof = gTrue; - return EOF; - } - eatBits(1); - code1 = look13Bits(); - } while ((code1 >> 1) != 0x001); - eatBits(12); - codingLine[++a0] = columns; - if (encoding > 0) { - eatBits(1); - nextLine2D = !(code1 & 1); - } - } -#endif - - a0 = 0; - outputBits = codingLine[1] - codingLine[0]; - if (outputBits == 0) { - a0 = 1; - outputBits = codingLine[2] - codingLine[1]; - } - - ++row; - } - - // get a byte - if (outputBits >= 8) { - ret = ((a0 & 1) == 0) ? 0xff : 0x00; - if ((outputBits -= 8) == 0) { - ++a0; - if (codingLine[a0] < columns) { - outputBits = codingLine[a0 + 1] - codingLine[a0]; - } - } - } else { - bits = 8; - ret = 0; - do { - if (outputBits > bits) { - i = bits; - bits = 0; - if ((a0 & 1) == 0) { - ret |= 0xff >> (8 - i); - } - outputBits -= i; - } else { - i = outputBits; - bits -= outputBits; - if ((a0 & 1) == 0) { - ret |= (0xff >> (8 - i)) << bits; - } - outputBits = 0; - ++a0; - if (codingLine[a0] < columns) { - outputBits = codingLine[a0 + 1] - codingLine[a0]; - } - } - } while (bits > 0 && codingLine[a0] < columns); - } - buf = black ? (ret ^ 0xff) : ret; - return buf; -} - -short CCITTFaxStream::getTwoDimCode() { - short code; - CCITTCode *p; - int n; - - code = 0; // make gcc happy - if (endOfBlock) { - code = lookBits(7); - p = &twoDimTab1[code]; - if (p->bits > 0) { - eatBits(p->bits); - return p->n; - } - } else { - for (n = 1; n <= 7; ++n) { - code = lookBits(n); - if (n < 7) { - code <<= 7 - n; - } - p = &twoDimTab1[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - } - error(getPos(), "Bad two dim code (%04x) in CCITTFax stream", code); - return EOF; -} - -short CCITTFaxStream::getWhiteCode() { - short code; - CCITTCode *p; - int n; - - code = 0; // make gcc happy - if (endOfBlock) { - code = lookBits(12); - if ((code >> 5) == 0) { - p = &whiteTab1[code]; - } else { - p = &whiteTab2[code >> 3]; - } - if (p->bits > 0) { - eatBits(p->bits); - return p->n; - } - } else { - for (n = 1; n <= 9; ++n) { - code = lookBits(n); - if (n < 9) { - code <<= 9 - n; - } - p = &whiteTab2[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - for (n = 11; n <= 12; ++n) { - code = lookBits(n); - if (n < 12) { - code <<= 12 - n; - } - p = &whiteTab1[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - } - error(getPos(), "Bad white code (%04x) in CCITTFax stream", code); - // eat a bit and return a positive number so that the caller doesn't - // go into an infinite loop - eatBits(1); - return 1; -} - -short CCITTFaxStream::getBlackCode() { - short code; - CCITTCode *p; - int n; - - code = 0; // make gcc happy - if (endOfBlock) { - code = lookBits(13); - if ((code >> 7) == 0) { - p = &blackTab1[code]; - } else if ((code >> 9) == 0) { - p = &blackTab2[(code >> 1) - 64]; - } else { - p = &blackTab3[code >> 7]; - } - if (p->bits > 0) { - eatBits(p->bits); - return p->n; - } - } else { - for (n = 2; n <= 6; ++n) { - code = lookBits(n); - if (n < 6) { - code <<= 6 - n; - } - p = &blackTab3[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - for (n = 7; n <= 12; ++n) { - code = lookBits(n); - if (n < 12) { - code <<= 12 - n; - } - if (code >= 64) { - p = &blackTab2[code - 64]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - } - for (n = 10; n <= 13; ++n) { - code = lookBits(n); - if (n < 13) { - code <<= 13 - n; - } - p = &blackTab1[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - } - error(getPos(), "Bad black code (%04x) in CCITTFax stream", code); - // eat a bit and return a positive number so that the caller doesn't - // go into an infinite loop - eatBits(1); - return 1; -} - -short CCITTFaxStream::lookBits(int n) { - int c; - - while (inputBits < n) { - if ((c = str->getChar()) == EOF) { - if (inputBits == 0) { - return EOF; - } - // near the end of the stream, the caller may ask for more bits - // than are available, but there may still be a valid code in - // however many bits are available -- we need to return correct - // data in this case - return (inputBuf << (n - inputBits)) & (0xffff >> (16 - n)); - } - inputBuf = (inputBuf << 8) + c; - inputBits += 8; - } - return (inputBuf >> (inputBits - n)) & (0xffff >> (16 - n)); -} -#else // secfix -CCITTFaxStream::CCITTFaxStream(Stream *strA, int encodingA, GBool endOfLineA, - GBool byteAlignA, int columnsA, int rowsA, - GBool endOfBlockA, GBool blackA): - FilterStream(strA) { - encoding = encodingA; - endOfLine = endOfLineA; - byteAlign = byteAlignA; - columns = columnsA; - if (columns < 1) { - columns = 1; - } else if (columns > (INT_MAX - 2)/sizeof(int)) { - columns = (INT_MAX - 2)/sizeof(int); - } - rows = rowsA; - endOfBlock = endOfBlockA; - black = blackA; - // 0 <= codingLine[0] < codingLine[1] < ... < codingLine[n] = columns - // ---> max codingLine size = columns + 1 - // refLine has one extra guard entry at the end - // ---> max refLine size = columns + 2 - codingLine = (int *)gmalloc((columns + 1) * sizeof(int)); - refLine = (int *)gmalloc((columns + 2) * sizeof(int)); - - eof = gFalse; - row = 0; - nextLine2D = encoding < 0; - inputBits = 0; - codingLine[0] = columns; - a0i = 0; - outputBits = 0; - - buf = EOF; -} - -CCITTFaxStream::~CCITTFaxStream() { - delete str; - gfree(refLine); - gfree(codingLine); -} - -void CCITTFaxStream::reset() { - short code1; - - str->reset(); - eof = gFalse; - row = 0; - nextLine2D = encoding < 0; - inputBits = 0; - codingLine[0] = columns; - a0i = 0; - outputBits = 0; - buf = EOF; - - // skip any initial zero bits and end-of-line marker, and get the 2D - // encoding tag - while ((code1 = lookBits(12)) == 0) { - eatBits(1); - } - if (code1 == 0x001) { - eatBits(12); - } - if (encoding > 0) { - nextLine2D = !lookBits(1); - eatBits(1); - } -} - -inline void CCITTFaxStream::addPixels(int a1, int blackPixels) { - if (a1 > codingLine[a0i]) { - if (a1 > columns) { - error(getPos(), "CCITTFax row is wrong length (%d)", a1); - err = gTrue; - a1 = columns; - } - if ((a0i & 1) ^ blackPixels) { - ++a0i; - } - codingLine[a0i] = a1; - } -} - -inline void CCITTFaxStream::addPixelsNeg(int a1, int blackPixels) { - if (a1 > codingLine[a0i]) { - if (a1 > columns) { - error(getPos(), "CCITTFax row is wrong length (%d)", a1); - err = gTrue; - a1 = columns; - } - if ((a0i & 1) ^ blackPixels) { - ++a0i; - } - codingLine[a0i] = a1; - } else if (a1 < codingLine[a0i]) { - if (a1 < 0) { - error(getPos(), "Invalid CCITTFax code"); - err = gTrue; - a1 = 0; - } - while (a0i > 0 && a1 <= codingLine[a0i - 1]) { - --a0i; - } - codingLine[a0i] = a1; - } -} - -int CCITTFaxStream::lookChar() { - short code1, code2, code3; - int b1i, blackPixels, i, bits; - GBool gotEOL; - - if (buf != EOF) { - return buf; - } - - // read the next row - if (outputBits == 0) { - - // if at eof just return EOF - if (eof) { - return EOF; - } - - err = gFalse; - - // 2-D encoding - if (nextLine2D) { - for (i = 0; codingLine[i] < columns; ++i) { - refLine[i] = codingLine[i]; - } - refLine[i++] = columns; - refLine[i] = columns; - codingLine[0] = 0; - a0i = 0; - b1i = 0; - blackPixels = 0; - // invariant: - // refLine[b1i-1] <= codingLine[a0i] < refLine[b1i] < refLine[b1i+1] - // <= columns - // exception at left edge: - // codingLine[a0i = 0] = refLine[b1i = 0] = 0 is possible - // exception at right edge: - // refLine[b1i] = refLine[b1i+1] = columns is possible - while (codingLine[a0i] < columns) { - code1 = getTwoDimCode(); - switch (code1) { - case twoDimPass: - addPixels(refLine[b1i + 1], blackPixels); - if (refLine[b1i + 1] < columns) { - b1i += 2; - } - break; - case twoDimHoriz: - code1 = code2 = 0; - if (blackPixels) { - do { - code1 += code3 = getBlackCode(); - } while (code3 >= 64); - do { - code2 += code3 = getWhiteCode(); - } while (code3 >= 64); - } else { - do { - code1 += code3 = getWhiteCode(); - } while (code3 >= 64); - do { - code2 += code3 = getBlackCode(); - } while (code3 >= 64); - } - addPixels(codingLine[a0i] + code1, blackPixels); - if (codingLine[a0i] < columns) { - addPixels(codingLine[a0i] + code2, blackPixels ^ 1); - } - while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { - b1i += 2; - } - break; - case twoDimVertR3: - addPixels(refLine[b1i] + 3, blackPixels); - blackPixels ^= 1; - if (codingLine[a0i] < columns) { - ++b1i; - while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { - b1i += 2; - } - } - break; - case twoDimVertR2: - addPixels(refLine[b1i] + 2, blackPixels); - blackPixels ^= 1; - if (codingLine[a0i] < columns) { - ++b1i; - while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { - b1i += 2; - } - } - break; - case twoDimVertR1: - addPixels(refLine[b1i] + 1, blackPixels); - blackPixels ^= 1; - if (codingLine[a0i] < columns) { - ++b1i; - while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { - b1i += 2; - } - } - break; - case twoDimVert0: - addPixels(refLine[b1i], blackPixels); - blackPixels ^= 1; - if (codingLine[a0i] < columns) { - ++b1i; - while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { - b1i += 2; - } - } - break; - case twoDimVertL3: - addPixelsNeg(refLine[b1i] - 3, blackPixels); - blackPixels ^= 1; - if (codingLine[a0i] < columns) { - if (b1i > 0) { - --b1i; - } else { - ++b1i; - } - while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { - b1i += 2; - } - } - break; - case twoDimVertL2: - addPixelsNeg(refLine[b1i] - 2, blackPixels); - blackPixels ^= 1; - if (codingLine[a0i] < columns) { - if (b1i > 0) { - --b1i; - } else { - ++b1i; - } - while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { - b1i += 2; - } - } - break; - case twoDimVertL1: - addPixelsNeg(refLine[b1i] - 1, blackPixels); - blackPixels ^= 1; - if (codingLine[a0i] < columns) { - if (b1i > 0) { - --b1i; - } else { - ++b1i; - } - while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { - b1i += 2; - } - } - break; - case EOF: - addPixels(columns, 0); - eof = gTrue; - break; - default: - error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1); - addPixels(columns, 0); - err = gTrue; - break; - } - } - - // 1-D encoding - } else { - codingLine[0] = 0; - a0i = 0; - blackPixels = 0; - while (codingLine[a0i] < columns) { - code1 = 0; - if (blackPixels) { - do { - code1 += code3 = getBlackCode(); - } while (code3 >= 64); - } else { - do { - code1 += code3 = getWhiteCode(); - } while (code3 >= 64); - } - addPixels(codingLine[a0i] + code1, blackPixels); - blackPixels ^= 1; - } - } - - // byte-align the row - if (byteAlign) { - inputBits &= ~7; - } - - // check for end-of-line marker, skipping over any extra zero bits - gotEOL = gFalse; - if (!endOfBlock && row == rows - 1) { - eof = gTrue; - } else { - code1 = lookBits(12); - while (code1 == 0) { - eatBits(1); - code1 = lookBits(12); - } - if (code1 == 0x001) { - eatBits(12); - gotEOL = gTrue; - } else if (code1 == EOF) { - eof = gTrue; - } - } - - // get 2D encoding tag - if (!eof && encoding > 0) { - nextLine2D = !lookBits(1); - eatBits(1); - } - - // check for end-of-block marker - if (endOfBlock && gotEOL) { - code1 = lookBits(12); - if (code1 == 0x001) { - eatBits(12); - if (encoding > 0) { - lookBits(1); - eatBits(1); - } - if (encoding >= 0) { - for (i = 0; i < 4; ++i) { - code1 = lookBits(12); - if (code1 != 0x001) { - error(getPos(), "Bad RTC code in CCITTFax stream"); - } - eatBits(12); - if (encoding > 0) { - lookBits(1); - eatBits(1); - } - } - } - eof = gTrue; - } - - // look for an end-of-line marker after an error -- we only do - // this if we know the stream contains end-of-line markers because - // the "just plow on" technique tends to work better otherwise - } else if (err && endOfLine) { - while (1) { - code1 = lookBits(13); - if (code1 == EOF) { - eof = gTrue; - return EOF; - } - if ((code1 >> 1) == 0x001) { - break; - } - eatBits(1); - } - eatBits(12); - if (encoding > 0) { - eatBits(1); - nextLine2D = !(code1 & 1); - } - } - - // set up for output - if (codingLine[0] > 0) { - outputBits = codingLine[a0i = 0]; - } else { - outputBits = codingLine[a0i = 1]; - } - - ++row; - } - - // get a byte - if (outputBits >= 8) { - buf = (a0i & 1) ? 0x00 : 0xff; - outputBits -= 8; - if (outputBits == 0 && codingLine[a0i] < columns) { - ++a0i; - outputBits = codingLine[a0i] - codingLine[a0i - 1]; - } - } else { - bits = 8; - buf = 0; - do { - if (outputBits > bits) { - buf <<= bits; - if (!(a0i & 1)) { - buf |= 0xff >> (8 - bits); - } - outputBits -= bits; - bits = 0; - } else { - buf <<= outputBits; - if (!(a0i & 1)) { - buf |= 0xff >> (8 - outputBits); - } - bits -= outputBits; - outputBits = 0; - if (codingLine[a0i] < columns) { - ++a0i; - outputBits = codingLine[a0i] - codingLine[a0i - 1]; - } else if (bits > 0) { - buf <<= bits; - bits = 0; - } - } - } while (bits); - } - if (black) { - buf ^= 0xff; - } - return buf; -} - -short CCITTFaxStream::getTwoDimCode() { - short code; - CCITTCode *p; - int n; - - code = 0; // make gcc happy - if (endOfBlock) { - code = lookBits(7); - p = &twoDimTab1[code]; - if (p->bits > 0) { - eatBits(p->bits); - return p->n; - } - } else { - for (n = 1; n <= 7; ++n) { - code = lookBits(n); - if (n < 7) { - code <<= 7 - n; - } - p = &twoDimTab1[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - } - error(getPos(), "Bad two dim code (%04x) in CCITTFax stream", code); - return EOF; -} - -short CCITTFaxStream::getWhiteCode() { - short code; - CCITTCode *p; - int n; - - code = 0; // make gcc happy - if (endOfBlock) { - code = lookBits(12); - if (code == EOF) { - return 1; - } - if ((code >> 5) == 0) { - p = &whiteTab1[code]; - } else { - p = &whiteTab2[code >> 3]; - } - if (p->bits > 0) { - eatBits(p->bits); - return p->n; - } - } else { - for (n = 1; n <= 9; ++n) { - code = lookBits(n); - if (code == EOF) { - return 1; - } - if (n < 9) { - code <<= 9 - n; - } - p = &whiteTab2[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - for (n = 11; n <= 12; ++n) { - code = lookBits(n); - if (code == EOF) { - return 1; - } - if (n < 12) { - code <<= 12 - n; - } - p = &whiteTab1[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - } - error(getPos(), "Bad white code (%04x) in CCITTFax stream", code); - // eat a bit and return a positive number so that the caller doesn't - // go into an infinite loop - eatBits(1); - return 1; -} - -short CCITTFaxStream::getBlackCode() { - short code; - CCITTCode *p; - int n; - - code = 0; // make gcc happy - if (endOfBlock) { - code = lookBits(13); - if (code == EOF) { - return 1; - } - if ((code >> 7) == 0) { - p = &blackTab1[code]; - } else if ((code >> 9) == 0 && (code >> 7) != 0) { - p = &blackTab2[(code >> 1) - 64]; - } else { - p = &blackTab3[code >> 7]; - } - if (p->bits > 0) { - eatBits(p->bits); - return p->n; - } - } else { - for (n = 2; n <= 6; ++n) { - code = lookBits(n); - if (code == EOF) { - return 1; - } - if (n < 6) { - code <<= 6 - n; - } - p = &blackTab3[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - for (n = 7; n <= 12; ++n) { - code = lookBits(n); - if (code == EOF) { - return 1; - } - if (n < 12) { - code <<= 12 - n; - } - if (code >= 64) { - p = &blackTab2[code - 64]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - } - for (n = 10; n <= 13; ++n) { - code = lookBits(n); - if (code == EOF) { - return 1; - } - if (n < 13) { - code <<= 13 - n; - } - p = &blackTab1[code]; - if (p->bits == n) { - eatBits(n); - return p->n; - } - } - } - error(getPos(), "Bad black code (%04x) in CCITTFax stream", code); - // eat a bit and return a positive number so that the caller doesn't - // go into an infinite loop - eatBits(1); - return 1; -} - -short CCITTFaxStream::lookBits(int n) { - int c; - - while (inputBits < n) { - if ((c = str->getChar()) == EOF) { - if (inputBits == 0) { - return EOF; - } - // near the end of the stream, the caller may ask for more bits - // than are available, but there may still be a valid code in - // however many bits are available -- we need to return correct - // data in this case - return (inputBuf << (n - inputBits)) & (0xffff >> (16 - n)); - } - inputBuf = (inputBuf << 8) + c; - inputBits += 8; - } - return (inputBuf >> (inputBits - n)) & (0xffff >> (16 - n)); -} - -#endif - -GString *CCITTFaxStream::getPSFilter(const char *indent) { - GString *s; - char s1[50]; - - if (!(s = str->getPSFilter(indent))) { - return NULL; - } - s->append(indent)->append("<< "); - if (encoding != 0) { - sprintf(s1, "/K %d ", encoding); - s->append(s1); - } - if (endOfLine) { - s->append("/EndOfLine true "); - } - if (byteAlign) { - s->append("/EncodedByteAlign true "); - } - sprintf(s1, "/Columns %d ", columns); - s->append(s1); - if (rows != 0) { - sprintf(s1, "/Rows %d ", rows); - s->append(s1); - } - if (!endOfBlock) { - s->append("/EndOfBlock false "); - } - if (black) { - s->append("/BlackIs1 true "); - } - s->append(">> /CCITTFaxDecode filter\n"); - return s; -} - -GBool CCITTFaxStream::isBinary(GBool /*last*/) { - return str->isBinary(gTrue); -} - -//------------------------------------------------------------------------ -// DCTStream -//------------------------------------------------------------------------ - -// IDCT constants (20.12 fixed point format) -#define dctCos1 4017 // cos(pi/16) -#define dctSin1 799 // sin(pi/16) -#define dctCos3 3406 // cos(3*pi/16) -#define dctSin3 2276 // sin(3*pi/16) -#define dctCos6 1567 // cos(6*pi/16) -#define dctSin6 3784 // sin(6*pi/16) -#define dctSqrt2 5793 // sqrt(2) -#define dctSqrt1d2 2896 // sqrt(2) / 2 - -// color conversion parameters (16.16 fixed point format) -#define dctCrToR 91881 // 1.4020 -#define dctCbToG -22553 // -0.3441363 -#define dctCrToG -46802 // -0.71413636 -#define dctCbToB 116130 // 1.772 - -// clip [-256,511] --> [0,255] -#define dctClipOffset 256 -static Guchar dctClip[768]; -static int dctClipInit = 0; - -// zig zag decode map -static int dctZigZag[64] = { - 0, - 1, 8, - 16, 9, 2, - 3, 10, 17, 24, - 32, 25, 18, 11, 4, - 5, 12, 19, 26, 33, 40, - 48, 41, 34, 27, 20, 13, 6, - 7, 14, 21, 28, 35, 42, 49, 56, - 57, 50, 43, 36, 29, 22, 15, - 23, 30, 37, 44, 51, 58, - 59, 52, 45, 38, 31, - 39, 46, 53, 60, - 61, 54, 47, - 55, 62, - 63 -}; - -DCTStream::DCTStream(Stream *strA): - FilterStream(strA) { - int i, j; - - progressive = interleaved = gFalse; - width = height = 0; - mcuWidth = mcuHeight = 0; - numComps = 0; - comp = 0; - x = y = dy = 0; - for (i = 0; i < 4; ++i) { - for (j = 0; j < 32; ++j) { - rowBuf[i][j] = NULL; - } - frameBuf[i] = NULL; - } - - if (!dctClipInit) { - for (i = -256; i < 0; ++i) - dctClip[dctClipOffset + i] = 0; - for (i = 0; i < 256; ++i) - dctClip[dctClipOffset + i] = i; - for (i = 256; i < 512; ++i) - dctClip[dctClipOffset + i] = 255; - dctClipInit = 1; - } -} - -DCTStream::~DCTStream() { - int i, j; - - delete str; - if (progressive || !interleaved) { - for (i = 0; i < numComps; ++i) { - gfree(frameBuf[i]); - } - } else { - for (i = 0; i < numComps; ++i) { - for (j = 0; j < mcuHeight; ++j) { - gfree(rowBuf[i][j]); - } - } - } -} - -void DCTStream::reset() { - int minHSample, minVSample; - int i, j; - - str->reset(); - - progressive = interleaved = gFalse; - width = height = 0; - numComps = 0; - numQuantTables = 0; - numDCHuffTables = 0; - numACHuffTables = 0; - colorXform = 0; - gotAdobeMarker = gFalse; - restartInterval = 0; - - if (!readHeader()) { - y = height; - return; - } - - // compute MCU size - mcuWidth = minHSample = compInfo[0].hSample; - mcuHeight = minVSample = compInfo[0].vSample; - for (i = 1; i < numComps; ++i) { - if (compInfo[i].hSample < minHSample) - minHSample = compInfo[i].hSample; - if (compInfo[i].vSample < minVSample) - minVSample = compInfo[i].vSample; - if (compInfo[i].hSample > mcuWidth) - mcuWidth = compInfo[i].hSample; - if (compInfo[i].vSample > mcuHeight) - mcuHeight = compInfo[i].vSample; - } - for (i = 0; i < numComps; ++i) { - compInfo[i].hSample /= minHSample; - compInfo[i].vSample /= minVSample; - } - mcuWidth = (mcuWidth / minHSample) * 8; - mcuHeight = (mcuHeight / minVSample) * 8; - - // figure out color transform - if (!gotAdobeMarker && numComps == 3) { - if (compInfo[0].id == 1 && compInfo[1].id == 2 && compInfo[2].id == 3) { - colorXform = 1; - } - } - - if (progressive || !interleaved) { - - // allocate a buffer for the whole image - bufWidth = ((width + mcuWidth - 1) / mcuWidth) * mcuWidth; - bufHeight = ((height + mcuHeight - 1) / mcuHeight) * mcuHeight; - if (bufWidth <= 0 || bufHeight <= 0 || - bufWidth > INT_MAX / bufWidth / (int)sizeof(int)) { - error(getPos(), "Invalid image size in DCT stream"); - y = height; - return; - } - for (i = 0; i < numComps; ++i) { - frameBuf[i] = (int *)gmalloc(bufWidth * bufHeight * sizeof(int)); - memset(frameBuf[i], 0, bufWidth * bufHeight * sizeof(int)); - } - - // read the image data - do { - restartMarker = 0xd0; - restart(); - readScan(); - } while (readHeader()); - - // decode - decodeImage(); - - // initialize counters - comp = 0; - x = 0; - y = 0; - - } else { - - // allocate a buffer for one row of MCUs - bufWidth = ((width + mcuWidth - 1) / mcuWidth) * mcuWidth; - for (i = 0; i < numComps; ++i) { - for (j = 0; j < mcuHeight; ++j) { - rowBuf[i][j] = (Guchar *)gmalloc(bufWidth * sizeof(Guchar)); - } - } - - // initialize counters - comp = 0; - x = 0; - y = 0; - dy = mcuHeight; - - restartMarker = 0xd0; - restart(); - } -} - -int DCTStream::getChar() { - int c; - - if (y >= height) { - return EOF; - } - if (progressive || !interleaved) { - c = frameBuf[comp][y * bufWidth + x]; - if (++comp == numComps) { - comp = 0; - if (++x == width) { - x = 0; - ++y; - } - } - } else { - if (dy >= mcuHeight) { - if (!readMCURow()) { - y = height; - return EOF; - } - comp = 0; - x = 0; - dy = 0; - } - c = rowBuf[comp][dy][x]; - if (++comp == numComps) { - comp = 0; - if (++x == width) { - x = 0; - ++y; - ++dy; - if (y == height) { - readTrailer(); - } - } - } - } - return c; -} - -int DCTStream::lookChar() { - if (y >= height) { - return EOF; - } - if (progressive || !interleaved) { - return frameBuf[comp][y * bufWidth + x]; - } else { - if (dy >= mcuHeight) { - if (!readMCURow()) { - y = height; - return EOF; - } - comp = 0; - x = 0; - dy = 0; - } - return rowBuf[comp][dy][x]; - } -} - -void DCTStream::restart() { - int i; - - inputBits = 0; - restartCtr = restartInterval; - for (i = 0; i < numComps; ++i) { - compInfo[i].prevDC = 0; - } - eobRun = 0; -} - -// Read one row of MCUs from a sequential JPEG stream. -GBool DCTStream::readMCURow() { - int data1[64]; - Guchar data2[64]; - Guchar *p1, *p2; - int pY, pCb, pCr, pR, pG, pB; - int h, v, horiz, vert, hSub, vSub; - int x1, x2, y2, x3, y3, x4, y4, x5, y5, cc, i; - int c; - - for (x1 = 0; x1 < width; x1 += mcuWidth) { - - // deal with restart marker - if (restartInterval > 0 && restartCtr == 0) { - c = readMarker(); - if (c != restartMarker) { - error(getPos(), "Bad DCT data: incorrect restart marker"); - return gFalse; - } - if (++restartMarker == 0xd8) - restartMarker = 0xd0; - restart(); - } - - // read one MCU - for (cc = 0; cc < numComps; ++cc) { - h = compInfo[cc].hSample; - v = compInfo[cc].vSample; - horiz = mcuWidth / h; - vert = mcuHeight / v; - hSub = horiz / 8; - vSub = vert / 8; - for (y2 = 0; y2 < mcuHeight; y2 += vert) { - for (x2 = 0; x2 < mcuWidth; x2 += horiz) { - if (!readDataUnit(&dcHuffTables[scanInfo.dcHuffTable[cc]], - &acHuffTables[scanInfo.acHuffTable[cc]], - &compInfo[cc].prevDC, - data1)) { - return gFalse; - } - transformDataUnit(quantTables[compInfo[cc].quantTable], - data1, data2); - if (hSub == 1 && vSub == 1) { - for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) { - p1 = &rowBuf[cc][y2+y3][x1+x2]; - p1[0] = data2[i]; - p1[1] = data2[i+1]; - p1[2] = data2[i+2]; - p1[3] = data2[i+3]; - p1[4] = data2[i+4]; - p1[5] = data2[i+5]; - p1[6] = data2[i+6]; - p1[7] = data2[i+7]; - } - } else if (hSub == 2 && vSub == 2) { - for (y3 = 0, i = 0; y3 < 16; y3 += 2, i += 8) { - p1 = &rowBuf[cc][y2+y3][x1+x2]; - p2 = &rowBuf[cc][y2+y3+1][x1+x2]; - p1[0] = p1[1] = p2[0] = p2[1] = data2[i]; - p1[2] = p1[3] = p2[2] = p2[3] = data2[i+1]; - p1[4] = p1[5] = p2[4] = p2[5] = data2[i+2]; - p1[6] = p1[7] = p2[6] = p2[7] = data2[i+3]; - p1[8] = p1[9] = p2[8] = p2[9] = data2[i+4]; - p1[10] = p1[11] = p2[10] = p2[11] = data2[i+5]; - p1[12] = p1[13] = p2[12] = p2[13] = data2[i+6]; - p1[14] = p1[15] = p2[14] = p2[15] = data2[i+7]; - } - } else { - i = 0; - for (y3 = 0, y4 = 0; y3 < 8; ++y3, y4 += vSub) { - for (x3 = 0, x4 = 0; x3 < 8; ++x3, x4 += hSub) { - for (y5 = 0; y5 < vSub; ++y5) - for (x5 = 0; x5 < hSub; ++x5) - rowBuf[cc][y2+y4+y5][x1+x2+x4+x5] = data2[i]; - ++i; - } - } - } - } - } - } - --restartCtr; - - // color space conversion - if (colorXform) { - // convert YCbCr to RGB - if (numComps == 3) { - for (y2 = 0; y2 < mcuHeight; ++y2) { - for (x2 = 0; x2 < mcuWidth; ++x2) { - pY = rowBuf[0][y2][x1+x2]; - pCb = rowBuf[1][y2][x1+x2] - 128; - pCr = rowBuf[2][y2][x1+x2] - 128; - pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16; - rowBuf[0][y2][x1+x2] = dctClip[dctClipOffset + pR]; - pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr + 32768) >> 16; - rowBuf[1][y2][x1+x2] = dctClip[dctClipOffset + pG]; - pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16; - rowBuf[2][y2][x1+x2] = dctClip[dctClipOffset + pB]; - } - } - // convert YCbCrK to CMYK (K is passed through unchanged) - } else if (numComps == 4) { - for (y2 = 0; y2 < mcuHeight; ++y2) { - for (x2 = 0; x2 < mcuWidth; ++x2) { - pY = rowBuf[0][y2][x1+x2]; - pCb = rowBuf[1][y2][x1+x2] - 128; - pCr = rowBuf[2][y2][x1+x2] - 128; - pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16; - rowBuf[0][y2][x1+x2] = 255 - dctClip[dctClipOffset + pR]; - pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr + 32768) >> 16; - rowBuf[1][y2][x1+x2] = 255 - dctClip[dctClipOffset + pG]; - pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16; - rowBuf[2][y2][x1+x2] = 255 - dctClip[dctClipOffset + pB]; - } - } - } - } - } - return gTrue; -} - -// Read one scan from a progressive or non-interleaved JPEG stream. -void DCTStream::readScan() { - int data[64]; - int x1, y1, dy1, x2, y2, y3, cc, i; - int h, v, horiz, vert, hSub, vSub; - int *p1; - int c; - - if (scanInfo.numComps == 1) { - for (cc = 0; cc < numComps; ++cc) { - if (scanInfo.comp[cc]) { - break; - } - } - dy1 = mcuHeight / compInfo[cc].vSample; - } else { - dy1 = mcuHeight; - } - - for (y1 = 0; y1 < bufHeight; y1 += dy1) { - for (x1 = 0; x1 < bufWidth; x1 += mcuWidth) { - - // deal with restart marker - if (restartInterval > 0 && restartCtr == 0) { - c = readMarker(); - if (c != restartMarker) { - error(getPos(), "Bad DCT data: incorrect restart marker"); - return; - } - if (++restartMarker == 0xd8) { - restartMarker = 0xd0; - } - restart(); - } - - // read one MCU - for (cc = 0; cc < numComps; ++cc) { - if (!scanInfo.comp[cc]) { - continue; - } - - h = compInfo[cc].hSample; - v = compInfo[cc].vSample; - horiz = mcuWidth / h; - vert = mcuHeight / v; - hSub = horiz / 8; - vSub = vert / 8; - for (y2 = 0; y2 < dy1; y2 += vert) { - for (x2 = 0; x2 < mcuWidth; x2 += horiz) { - - // pull out the current values - p1 = &frameBuf[cc][(y1+y2) * bufWidth + (x1+x2)]; - for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) { - data[i] = p1[0]; - data[i+1] = p1[1]; - data[i+2] = p1[2]; - data[i+3] = p1[3]; - data[i+4] = p1[4]; - data[i+5] = p1[5]; - data[i+6] = p1[6]; - data[i+7] = p1[7]; - p1 += bufWidth * vSub; - } - - // read one data unit - if (progressive) { - if (!readProgressiveDataUnit( - &dcHuffTables[scanInfo.dcHuffTable[cc]], - &acHuffTables[scanInfo.acHuffTable[cc]], - &compInfo[cc].prevDC, - data)) { - return; - } - } else { - if (!readDataUnit(&dcHuffTables[scanInfo.dcHuffTable[cc]], - &acHuffTables[scanInfo.acHuffTable[cc]], - &compInfo[cc].prevDC, - data)) { - return; - } - } - - // add the data unit into frameBuf - p1 = &frameBuf[cc][(y1+y2) * bufWidth + (x1+x2)]; - for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) { - p1[0] = data[i]; - p1[1] = data[i+1]; - p1[2] = data[i+2]; - p1[3] = data[i+3]; - p1[4] = data[i+4]; - p1[5] = data[i+5]; - p1[6] = data[i+6]; - p1[7] = data[i+7]; - p1 += bufWidth * vSub; - } - } - } - } - --restartCtr; - } - } -} - -// Read one data unit from a sequential JPEG stream. -GBool DCTStream::readDataUnit(DCTHuffTable *dcHuffTable, - DCTHuffTable *acHuffTable, - int *prevDC, int data[64]) { - int run, size, amp; - int c; - int i, j; - - if ((size = readHuffSym(dcHuffTable)) == 9999) { - return gFalse; - } - if (size > 0) { - if ((amp = readAmp(size)) == 9999) { - return gFalse; - } - } else { - amp = 0; - } - data[0] = *prevDC += amp; - for (i = 1; i < 64; ++i) { - data[i] = 0; - } - i = 1; - while (i < 64) { - run = 0; - while ((c = readHuffSym(acHuffTable)) == 0xf0 && run < 0x30) { - run += 0x10; - } - if (c == 9999) { - return gFalse; - } - if (c == 0x00) { - break; - } else { - run += (c >> 4) & 0x0f; - size = c & 0x0f; - amp = readAmp(size); - if (amp == 9999) { - return gFalse; - } - i += run; - j = dctZigZag[i++]; - data[j] = amp; - } - } - return gTrue; -} - -// Read one data unit from a sequential JPEG stream. -GBool DCTStream::readProgressiveDataUnit(DCTHuffTable *dcHuffTable, - DCTHuffTable *acHuffTable, - int *prevDC, int data[64]) { - int run, size, amp, bit, c; - int i, j, k; - - // get the DC coefficient - i = scanInfo.firstCoeff; - if (i == 0) { - if (scanInfo.ah == 0) { - if ((size = readHuffSym(dcHuffTable)) == 9999) { - return gFalse; - } - if (size > 0) { - if ((amp = readAmp(size)) == 9999) { - return gFalse; - } - } else { - amp = 0; - } - data[0] += (*prevDC += amp) << scanInfo.al; - } else { - if ((bit = readBit()) == 9999) { - return gFalse; - } - data[0] += bit << scanInfo.al; - } - ++i; - } - if (scanInfo.lastCoeff == 0) { - return gTrue; - } - - // check for an EOB run - if (eobRun > 0) { - while (i <= scanInfo.lastCoeff) { - j = dctZigZag[i++]; - if (data[j] != 0) { - if ((bit = readBit()) == EOF) { - return gFalse; - } - if (bit) { - data[j] += 1 << scanInfo.al; - } - } - } - --eobRun; - return gTrue; - } - - // read the AC coefficients - while (i <= scanInfo.lastCoeff) { - if ((c = readHuffSym(acHuffTable)) == 9999) { - return gFalse; - } - - // ZRL - if (c == 0xf0) { - k = 0; - while (k < 16) { - j = dctZigZag[i++]; - if (data[j] == 0) { - ++k; - } else { - if ((bit = readBit()) == EOF) { - return gFalse; - } - if (bit) { - data[j] += 1 << scanInfo.al; - } - } - } - - // EOB run - } else if ((c & 0x0f) == 0x00) { - j = c >> 4; - eobRun = 0; - for (k = 0; k < j; ++k) { - if ((bit = readBit()) == EOF) { - return 9999; - } - eobRun = (eobRun << 1) | bit; - } - eobRun += 1 << j; - while (i <= scanInfo.lastCoeff) { - j = dctZigZag[i++]; - if (data[j] != 0) { - if ((bit = readBit()) == EOF) { - return gFalse; - } - if (bit) { - data[j] += 1 << scanInfo.al; - } - } - } - --eobRun; - break; - - // zero run and one AC coefficient - } else { - run = (c >> 4) & 0x0f; - size = c & 0x0f; - if ((amp = readAmp(size)) == 9999) { - return gFalse; - } - k = 0; - do { - j = dctZigZag[i++]; - while (data[j] != 0) { - if ((bit = readBit()) == EOF) { - return gFalse; - } - if (bit) { - data[j] += 1 << scanInfo.al; - } - j = dctZigZag[i++]; - } - ++k; - } while (k <= run); - data[j] = amp << scanInfo.al; - } - } - - return gTrue; -} - -// Decode a progressive JPEG image. -void DCTStream::decodeImage() { - int dataIn[64]; - Guchar dataOut[64]; - Guchar *quantTable; - int pY, pCb, pCr, pR, pG, pB; - int x1, y1, x2, y2, x3, y3, x4, y4, x5, y5, cc, i; - int h, v, horiz, vert, hSub, vSub; - int *p0, *p1, *p2; - - for (y1 = 0; y1 < bufHeight; y1 += mcuHeight) { - for (x1 = 0; x1 < bufWidth; x1 += mcuWidth) { - for (cc = 0; cc < numComps; ++cc) { - quantTable = quantTables[compInfo[cc].quantTable]; - h = compInfo[cc].hSample; - v = compInfo[cc].vSample; - horiz = mcuWidth / h; - vert = mcuHeight / v; - hSub = horiz / 8; - vSub = vert / 8; - for (y2 = 0; y2 < mcuHeight; y2 += vert) { - for (x2 = 0; x2 < mcuWidth; x2 += horiz) { - - // pull out the coded data unit - p1 = &frameBuf[cc][(y1+y2) * bufWidth + (x1+x2)]; - for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) { - dataIn[i] = p1[0]; - dataIn[i+1] = p1[1]; - dataIn[i+2] = p1[2]; - dataIn[i+3] = p1[3]; - dataIn[i+4] = p1[4]; - dataIn[i+5] = p1[5]; - dataIn[i+6] = p1[6]; - dataIn[i+7] = p1[7]; - p1 += bufWidth * vSub; - } - - // transform - transformDataUnit(quantTable, dataIn, dataOut); - - // store back into frameBuf, doing replication for - // subsampled components - p1 = &frameBuf[cc][(y1+y2) * bufWidth + (x1+x2)]; - if (hSub == 1 && vSub == 1) { - for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) { - p1[0] = dataOut[i] & 0xff; - p1[1] = dataOut[i+1] & 0xff; - p1[2] = dataOut[i+2] & 0xff; - p1[3] = dataOut[i+3] & 0xff; - p1[4] = dataOut[i+4] & 0xff; - p1[5] = dataOut[i+5] & 0xff; - p1[6] = dataOut[i+6] & 0xff; - p1[7] = dataOut[i+7] & 0xff; - p1 += bufWidth; - } - } else if (hSub == 2 && vSub == 2) { - p2 = p1 + bufWidth; - for (y3 = 0, i = 0; y3 < 16; y3 += 2, i += 8) { - p1[0] = p1[1] = p2[0] = p2[1] = dataOut[i] & 0xff; - p1[2] = p1[3] = p2[2] = p2[3] = dataOut[i+1] & 0xff; - p1[4] = p1[5] = p2[4] = p2[5] = dataOut[i+2] & 0xff; - p1[6] = p1[7] = p2[6] = p2[7] = dataOut[i+3] & 0xff; - p1[8] = p1[9] = p2[8] = p2[9] = dataOut[i+4] & 0xff; - p1[10] = p1[11] = p2[10] = p2[11] = dataOut[i+5] & 0xff; - p1[12] = p1[13] = p2[12] = p2[13] = dataOut[i+6] & 0xff; - p1[14] = p1[15] = p2[14] = p2[15] = dataOut[i+7] & 0xff; - p1 += bufWidth * 2; - p2 += bufWidth * 2; - } - } else { - i = 0; - for (y3 = 0, y4 = 0; y3 < 8; ++y3, y4 += vSub) { - for (x3 = 0, x4 = 0; x3 < 8; ++x3, x4 += hSub) { - p2 = p1 + x4; - for (y5 = 0; y5 < vSub; ++y5) { - for (x5 = 0; x5 < hSub; ++x5) { - p2[x5] = dataOut[i] & 0xff; - } - p2 += bufWidth; - } - ++i; - } - p1 += bufWidth * vSub; - } - } - } - } - } - - // color space conversion - if (colorXform) { - // convert YCbCr to RGB - if (numComps == 3) { - for (y2 = 0; y2 < mcuHeight; ++y2) { - p0 = &frameBuf[0][(y1+y2) * bufWidth + x1]; - p1 = &frameBuf[1][(y1+y2) * bufWidth + x1]; - p2 = &frameBuf[2][(y1+y2) * bufWidth + x1]; - for (x2 = 0; x2 < mcuWidth; ++x2) { - pY = *p0; - pCb = *p1 - 128; - pCr = *p2 - 128; - pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16; - *p0++ = dctClip[dctClipOffset + pR]; - pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr + - 32768) >> 16; - *p1++ = dctClip[dctClipOffset + pG]; - pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16; - *p2++ = dctClip[dctClipOffset + pB]; - } - } - // convert YCbCrK to CMYK (K is passed through unchanged) - } else if (numComps == 4) { - for (y2 = 0; y2 < mcuHeight; ++y2) { - p0 = &frameBuf[0][(y1+y2) * bufWidth + x1]; - p1 = &frameBuf[1][(y1+y2) * bufWidth + x1]; - p2 = &frameBuf[2][(y1+y2) * bufWidth + x1]; - for (x2 = 0; x2 < mcuWidth; ++x2) { - pY = *p0; - pCb = *p1 - 128; - pCr = *p2 - 128; - pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16; - *p0++ = 255 - dctClip[dctClipOffset + pR]; - pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr + - 32768) >> 16; - *p1++ = 255 - dctClip[dctClipOffset + pG]; - pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16; - *p2++ = 255 - dctClip[dctClipOffset + pB]; - } - } - } - } - } - } -} - -// Transform one data unit -- this performs the dequantization and -// IDCT steps. This IDCT algorithm is taken from: -// Christoph Loeffler, Adriaan Ligtenberg, George S. Moschytz, -// "Practical Fast 1-D DCT Algorithms with 11 Multiplications", -// IEEE Intl. Conf. on Acoustics, Speech & Signal Processing, 1989, -// 988-991. -// The stage numbers mentioned in the comments refer to Figure 1 in this -// paper. -void DCTStream::transformDataUnit(Guchar *quantTable, - int dataIn[64], Guchar dataOut[64]) { - int v0, v1, v2, v3, v4, v5, v6, v7, t; - int *p; - int i; - - // dequant - for (i = 0; i < 64; ++i) { - dataIn[i] *= quantTable[i]; - } - - // inverse DCT on rows - for (i = 0; i < 64; i += 8) { - p = dataIn + i; - - // check for all-zero AC coefficients - if (p[1] == 0 && p[2] == 0 && p[3] == 0 && - p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] == 0) { - t = (dctSqrt2 * p[0] + 512) >> 10; - p[0] = t; - p[1] = t; - p[2] = t; - p[3] = t; - p[4] = t; - p[5] = t; - p[6] = t; - p[7] = t; - continue; - } - - // stage 4 - v0 = (dctSqrt2 * p[0] + 128) >> 8; - v1 = (dctSqrt2 * p[4] + 128) >> 8; - v2 = p[2]; - v3 = p[6]; - v4 = (dctSqrt1d2 * (p[1] - p[7]) + 128) >> 8; - v7 = (dctSqrt1d2 * (p[1] + p[7]) + 128) >> 8; - v5 = p[3] << 4; - v6 = p[5] << 4; - - // stage 3 - t = (v0 - v1+ 1) >> 1; - v0 = (v0 + v1 + 1) >> 1; - v1 = t; - t = (v2 * dctSin6 + v3 * dctCos6 + 128) >> 8; - v2 = (v2 * dctCos6 - v3 * dctSin6 + 128) >> 8; - v3 = t; - t = (v4 - v6 + 1) >> 1; - v4 = (v4 + v6 + 1) >> 1; - v6 = t; - t = (v7 + v5 + 1) >> 1; - v5 = (v7 - v5 + 1) >> 1; - v7 = t; - - // stage 2 - t = (v0 - v3 + 1) >> 1; - v0 = (v0 + v3 + 1) >> 1; - v3 = t; - t = (v1 - v2 + 1) >> 1; - v1 = (v1 + v2 + 1) >> 1; - v2 = t; - t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12; - v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12; - v7 = t; - t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12; - v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12; - v6 = t; - - // stage 1 - p[0] = v0 + v7; - p[7] = v0 - v7; - p[1] = v1 + v6; - p[6] = v1 - v6; - p[2] = v2 + v5; - p[5] = v2 - v5; - p[3] = v3 + v4; - p[4] = v3 - v4; - } - - // inverse DCT on columns - for (i = 0; i < 8; ++i) { - p = dataIn + i; - - // check for all-zero AC coefficients - if (p[1*8] == 0 && p[2*8] == 0 && p[3*8] == 0 && - p[4*8] == 0 && p[5*8] == 0 && p[6*8] == 0 && p[7*8] == 0) { - t = (dctSqrt2 * dataIn[i+0] + 8192) >> 14; - p[0*8] = t; - p[1*8] = t; - p[2*8] = t; - p[3*8] = t; - p[4*8] = t; - p[5*8] = t; - p[6*8] = t; - p[7*8] = t; - continue; - } - - // stage 4 - v0 = (dctSqrt2 * p[0*8] + 2048) >> 12; - v1 = (dctSqrt2 * p[4*8] + 2048) >> 12; - v2 = p[2*8]; - v3 = p[6*8]; - v4 = (dctSqrt1d2 * (p[1*8] - p[7*8]) + 2048) >> 12; - v7 = (dctSqrt1d2 * (p[1*8] + p[7*8]) + 2048) >> 12; - v5 = p[3*8]; - v6 = p[5*8]; - - // stage 3 - t = (v0 - v1 + 1) >> 1; - v0 = (v0 + v1 + 1) >> 1; - v1 = t; - t = (v2 * dctSin6 + v3 * dctCos6 + 2048) >> 12; - v2 = (v2 * dctCos6 - v3 * dctSin6 + 2048) >> 12; - v3 = t; - t = (v4 - v6 + 1) >> 1; - v4 = (v4 + v6 + 1) >> 1; - v6 = t; - t = (v7 + v5 + 1) >> 1; - v5 = (v7 - v5 + 1) >> 1; - v7 = t; - - // stage 2 - t = (v0 - v3 + 1) >> 1; - v0 = (v0 + v3 + 1) >> 1; - v3 = t; - t = (v1 - v2 + 1) >> 1; - v1 = (v1 + v2 + 1) >> 1; - v2 = t; - t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12; - v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12; - v7 = t; - t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12; - v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12; - v6 = t; - - // stage 1 - p[0*8] = v0 + v7; - p[7*8] = v0 - v7; - p[1*8] = v1 + v6; - p[6*8] = v1 - v6; - p[2*8] = v2 + v5; - p[5*8] = v2 - v5; - p[3*8] = v3 + v4; - p[4*8] = v3 - v4; - } - - // convert to 8-bit integers - for (i = 0; i < 64; ++i) { - dataOut[i] = dctClip[dctClipOffset + 128 + ((dataIn[i] + 8) >> 4)]; - } -} - -int DCTStream::readHuffSym(DCTHuffTable *table) { - Gushort code; - int bit; - int codeBits; - - code = 0; - codeBits = 0; - do { - // add a bit to the code - if ((bit = readBit()) == EOF) - return 9999; - code = (code << 1) + bit; - ++codeBits; - - // look up code - if (code - table->firstCode[codeBits] < table->numCodes[codeBits]) { - code -= table->firstCode[codeBits]; - return table->sym[table->firstSym[codeBits] + code]; - } - } while (codeBits < 16); - - error(getPos(), "Bad Huffman code in DCT stream"); - return 9999; -} - -int DCTStream::readAmp(int size) { - int amp, bit; - int bits; - - amp = 0; - for (bits = 0; bits < size; ++bits) { - if ((bit = readBit()) == EOF) - return 9999; - amp = (amp << 1) + bit; - } - if (amp < (1 << (size - 1))) - amp -= (1 << size) - 1; - return amp; -} - -int DCTStream::readBit() { - int bit; - int c, c2; - - if (inputBits == 0) { - if ((c = str->getChar()) == EOF) - return EOF; - if (c == 0xff) { - do { - c2 = str->getChar(); - } while (c2 == 0xff); - if (c2 != 0x00) { - error(getPos(), "Bad DCT data: missing 00 after ff"); - return EOF; - } - } - inputBuf = c; - inputBits = 8; - } - bit = (inputBuf >> (inputBits - 1)) & 1; - --inputBits; - return bit; -} - -GBool DCTStream::readHeader() { - GBool doScan; - int n; - int c = 0; - int i; - - // read headers - doScan = gFalse; - while (!doScan) { - c = readMarker(); - switch (c) { - case 0xc0: // SOF0 - if (!readBaselineSOF()) { - return gFalse; - } - break; - case 0xc2: // SOF2 - if (!readProgressiveSOF()) { - return gFalse; - } - break; - case 0xc4: // DHT - if (!readHuffmanTables()) { - return gFalse; - } - break; - case 0xd8: // SOI - break; - case 0xd9: // EOI - return gFalse; - break; - case 0xda: // SOS - if (!readScanInfo()) { - return gFalse; - } - doScan = gTrue; - break; - case 0xdb: // DQT - if (!readQuantTables()) { - return gFalse; - } - break; - case 0xdd: // DRI - if (!readRestartInterval()) { - return gFalse; - } - break; - case 0xee: // APP14 - if (!readAdobeMarker()) { - return gFalse; - } - break; - case EOF: - error(getPos(), "Bad DCT header"); - return gFalse; - default: - // skip APPn / COM / etc. - if (c >= 0xe0) { - n = read16() - 2; - for (i = 0; i < n; ++i) { - str->getChar(); - } - } else { - error(getPos(), "Unknown DCT marker <%02x>", c); - return gFalse; - } - break; - } - } - - return gTrue; -} - -GBool DCTStream::readBaselineSOF() { - int length; - int prec; - int i; - int c; - - length = read16(); - prec = str->getChar(); - height = read16(); - width = read16(); - numComps = str->getChar(); - if (numComps <= 0 || numComps > 4) { - numComps = 0; - error(getPos(), "Bad number of components in DCT stream"); - return gFalse; - } - if (prec != 8) { - error(getPos(), "Bad DCT precision %d", prec); - return gFalse; - } - for (i = 0; i < numComps; ++i) { - compInfo[i].id = str->getChar(); - c = str->getChar(); - compInfo[i].hSample = (c >> 4) & 0x0f; - compInfo[i].vSample = c & 0x0f; - compInfo[i].quantTable = str->getChar(); - } - progressive = gFalse; - return gTrue; -} - -GBool DCTStream::readProgressiveSOF() { - int length; - int prec; - int i; - int c; - - length = read16(); - prec = str->getChar(); - height = read16(); - width = read16(); - numComps = str->getChar(); - if (numComps <= 0 || numComps > 4) { - numComps = 0; - error(getPos(), "Bad number of components in DCT stream"); - return gFalse; - } - if (prec != 8) { - error(getPos(), "Bad DCT precision %d", prec); - return gFalse; - } - for (i = 0; i < numComps; ++i) { - compInfo[i].id = str->getChar(); - c = str->getChar(); - compInfo[i].hSample = (c >> 4) & 0x0f; - compInfo[i].vSample = c & 0x0f; - compInfo[i].quantTable = str->getChar(); - } - progressive = gTrue; - return gTrue; -} - -GBool DCTStream::readScanInfo() { - int length; - int id, c; - int i, j; - - length = read16() - 2; - scanInfo.numComps = str->getChar(); - if (scanInfo.numComps <= 0 || scanInfo.numComps > 4) { - scanInfo.numComps = 0; - error(getPos(), "Bad number of components in DCT stream"); - return gFalse; - } - --length; - if (length != 2 * scanInfo.numComps + 3) { - error(getPos(), "Bad DCT scan info block"); - return gFalse; - } - interleaved = scanInfo.numComps == numComps; - for (j = 0; j < numComps; ++j) { - scanInfo.comp[j] = gFalse; - } - for (i = 0; i < scanInfo.numComps; ++i) { - id = str->getChar(); - for (j = 0; j < numComps; ++j) { - if (id == compInfo[j].id) { - break; - } - } - if (j == numComps) { - error(getPos(), "Bad DCT component ID in scan info block"); - return gFalse; - } - scanInfo.comp[j] = gTrue; - c = str->getChar(); - scanInfo.dcHuffTable[j] = (c >> 4) & 0x0f; - scanInfo.acHuffTable[j] = c & 0x0f; - } - scanInfo.firstCoeff = str->getChar(); - scanInfo.lastCoeff = str->getChar(); - if (scanInfo.firstCoeff < 0 || scanInfo.lastCoeff > 63 || - scanInfo.firstCoeff > scanInfo.lastCoeff) { - error(getPos(), "Bad DCT coefficient numbers in scan info block"); - return gFalse; - } - c = str->getChar(); - scanInfo.ah = (c >> 4) & 0x0f; - scanInfo.al = c & 0x0f; - return gTrue; -} - -GBool DCTStream::readQuantTables() { - int length; - int i; - int index; - - length = read16() - 2; - while (length > 0) { - index = str->getChar(); - if ((index & 0xf0) || index >= 4) { - error(getPos(), "Bad DCT quantization table"); - return gFalse; - } - if (index == numQuantTables) - numQuantTables = index + 1; - for (i = 0; i < 64; ++i) - quantTables[index][dctZigZag[i]] = str->getChar(); - length -= 65; - } - return gTrue; -} - -GBool DCTStream::readHuffmanTables() { - DCTHuffTable *tbl; - int length; - int index; - Gushort code; - Guchar sym; - int i; - int c; - - length = read16() - 2; - while (length > 0) { - index = str->getChar(); - --length; - if ((index & ~0x10) >= 4 || (index & ~0x10) < 0) { - error(getPos(), "Bad DCT Huffman table"); - return gFalse; - } - if (index & 0x10) { - index &= 0x03; - if (index >= numACHuffTables) - numACHuffTables = index+1; - tbl = &acHuffTables[index]; - } else { - if (index >= numDCHuffTables) - numDCHuffTables = index+1; - tbl = &dcHuffTables[index]; - } - sym = 0; - code = 0; - for (i = 1; i <= 16; ++i) { - c = str->getChar(); - tbl->firstSym[i] = sym; - tbl->firstCode[i] = code; - tbl->numCodes[i] = c; - sym += c; - code = (code + c) << 1; - } - length -= 16; - for (i = 0; i < sym; ++i) - tbl->sym[i] = str->getChar(); - length -= sym; - } - return gTrue; -} - -GBool DCTStream::readRestartInterval() { - int length; - - length = read16(); - if (length != 4) { - error(getPos(), "Bad DCT restart interval"); - return gFalse; - } - restartInterval = read16(); - return gTrue; -} - -GBool DCTStream::readAdobeMarker() { - int length, i; - char buf[12]; - int c; - - length = read16(); - if (length < 14) { - goto err; - } - for (i = 0; i < 12; ++i) { - if ((c = str->getChar()) == EOF) { - goto err; - } - buf[i] = c; - } - if (strncmp(buf, "Adobe", 5)) { - goto err; - } - colorXform = buf[11]; - gotAdobeMarker = gTrue; - for (i = 14; i < length; ++i) { - if (str->getChar() == EOF) { - goto err; - } - } - return gTrue; - - err: - error(getPos(), "Bad DCT Adobe APP14 marker"); - return gFalse; -} - -GBool DCTStream::readTrailer() { - int c; - - c = readMarker(); - if (c != 0xd9) { // EOI - error(getPos(), "Bad DCT trailer"); - return gFalse; - } - return gTrue; -} - -int DCTStream::readMarker() { - int c; - - do { - do { - c = str->getChar(); - if(c == EOF) return EOF; - } while (c != 0xff); - do { - c = str->getChar(); - if(c == EOF) return EOF; - } while (c == 0xff); - } while (c == 0x00); - return c; -} - -int DCTStream::read16() { - int c1, c2; - - if ((c1 = str->getChar()) == EOF) - return EOF; - if ((c2 = str->getChar()) == EOF) - return EOF; - return (c1 << 8) + c2; -} - -GString *DCTStream::getPSFilter(const char *indent) { - GString *s; - - if (!(s = str->getPSFilter(indent))) { - return NULL; - } - s->append(indent)->append("<< >> /DCTDecode filter\n"); - return s; -} - -GBool DCTStream::isBinary(GBool /*last*/) { - return str->isBinary(gTrue); -} - -//------------------------------------------------------------------------ -// FlateStream -//------------------------------------------------------------------------ - -int FlateStream::codeLenCodeMap[flateMaxCodeLenCodes] = { - 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 -}; - -FlateDecode FlateStream::lengthDecode[flateMaxLitCodes-257] = { - {0, 3}, - {0, 4}, - {0, 5}, - {0, 6}, - {0, 7}, - {0, 8}, - {0, 9}, - {0, 10}, - {1, 11}, - {1, 13}, - {1, 15}, - {1, 17}, - {2, 19}, - {2, 23}, - {2, 27}, - {2, 31}, - {3, 35}, - {3, 43}, - {3, 51}, - {3, 59}, - {4, 67}, - {4, 83}, - {4, 99}, - {4, 115}, - {5, 131}, - {5, 163}, - {5, 195}, - {5, 227}, - {0, 258} -}; - -FlateDecode FlateStream::distDecode[flateMaxDistCodes] = { - { 0, 1}, - { 0, 2}, - { 0, 3}, - { 0, 4}, - { 1, 5}, - { 1, 7}, - { 2, 9}, - { 2, 13}, - { 3, 17}, - { 3, 25}, - { 4, 33}, - { 4, 49}, - { 5, 65}, - { 5, 97}, - { 6, 129}, - { 6, 193}, - { 7, 257}, - { 7, 385}, - { 8, 513}, - { 8, 769}, - { 9, 1025}, - { 9, 1537}, - {10, 2049}, - {10, 3073}, - {11, 4097}, - {11, 6145}, - {12, 8193}, - {12, 12289}, - {13, 16385}, - {13, 24577} -}; - -FlateStream::FlateStream(Stream *strA, int predictor, int columns, - int colors, int bits): - FilterStream(strA) { - if (predictor != 1) { - pred = new StreamPredictor(this, predictor, columns, colors, bits); - if ( !pred->isOk()) { - delete pred; - pred = NULL; - } - } else { - pred = NULL; - } - litCodeTab.codes = NULL; - distCodeTab.codes = NULL; -} - -FlateStream::~FlateStream() { - gfree(litCodeTab.codes); - gfree(distCodeTab.codes); - if (pred) { - delete pred; - } - delete str; -} - -void FlateStream::reset() { - int cmf, flg; - - index = 0; - remain = 0; - codeBuf = 0; - codeSize = 0; - compressedBlock = gFalse; - endOfBlock = gTrue; - eof = gTrue; - - str->reset(); - - // read header - //~ need to look at window size? - endOfBlock = eof = gTrue; - cmf = str->getChar(); - flg = str->getChar(); - if (cmf == EOF || flg == EOF) - return; - if ((cmf & 0x0f) != 0x08) { - error(getPos(), "Unknown compression method in flate stream"); - return; - } - if ((((cmf << 8) + flg) % 31) != 0) { - error(getPos(), "Bad FCHECK in flate stream"); - return; - } - if (flg & 0x20) { - error(getPos(), "FDICT bit set in flate stream"); - return; - } - - eof = gFalse; -} - -int FlateStream::getChar() { - int c; - - if (pred) { - return pred->getChar(); - } - while (remain == 0) { - if (endOfBlock && eof) - return EOF; - readSome(); - } - c = buf[index]; - index = (index + 1) & flateMask; - --remain; - return c; -} - -int FlateStream::lookChar() { - int c; - - if (pred) { - return pred->lookChar(); - } - while (remain == 0) { - if (endOfBlock && eof) - return EOF; - readSome(); - } - c = buf[index]; - return c; -} - -int FlateStream::getRawChar() { - int c; - - while (remain == 0) { - if (endOfBlock && eof) - return EOF; - readSome(); - } - c = buf[index]; - index = (index + 1) & flateMask; - --remain; - return c; -} - -GString *FlateStream::getPSFilter(const char */*indent*/) { - return NULL; -} - -GBool FlateStream::isBinary(GBool /*last*/) { - return str->isBinary(gTrue); -} - -void FlateStream::readSome() { - int code1, code2; - int len, dist; - int i, j, k; - int c; - - if (endOfBlock) { - if (!startBlock()) - return; - } - - if (compressedBlock) { - if ((code1 = getHuffmanCodeWord(&litCodeTab)) == EOF) - goto err; - if (code1 < 256) { - buf[index] = code1; - remain = 1; - } else if (code1 == 256) { - endOfBlock = gTrue; - remain = 0; - } else { - code1 -= 257; - code2 = lengthDecode[code1].bits; - if (code2 > 0 && (code2 = getCodeWord(code2)) == EOF) - goto err; - len = lengthDecode[code1].first + code2; - if ((code1 = getHuffmanCodeWord(&distCodeTab)) == EOF) - goto err; - code2 = distDecode[code1].bits; - if (code2 > 0 && (code2 = getCodeWord(code2)) == EOF) - goto err; - dist = distDecode[code1].first + code2; - i = index; - j = (index - dist) & flateMask; - for (k = 0; k < len; ++k) { - buf[i] = buf[j]; - i = (i + 1) & flateMask; - j = (j + 1) & flateMask; - } - remain = len; - } - - } else { - len = (blockLen < flateWindow) ? blockLen : flateWindow; - for (i = 0, j = index; i < len; ++i, j = (j + 1) & flateMask) { - if ((c = str->getChar()) == EOF) { - endOfBlock = eof = gTrue; - break; - } - buf[j] = c & 0xff; - } - remain = i; - blockLen -= len; - if (blockLen == 0) - endOfBlock = gTrue; - } - - return; - -err: - error(getPos(), "Unexpected end of file in flate stream"); - endOfBlock = eof = gTrue; - remain = 0; -} - -GBool FlateStream::startBlock() { - int blockHdr; - int c; - int check; - - // free the code tables from the previous block - gfree(litCodeTab.codes); - litCodeTab.codes = NULL; - gfree(distCodeTab.codes); - distCodeTab.codes = NULL; - - // read block header - blockHdr = getCodeWord(3); - if (blockHdr & 1) - eof = gTrue; - blockHdr >>= 1; - - // uncompressed block - if (blockHdr == 0) { - compressedBlock = gFalse; - if ((c = str->getChar()) == EOF) - goto err; - blockLen = c & 0xff; - if ((c = str->getChar()) == EOF) - goto err; - blockLen |= (c & 0xff) << 8; - if ((c = str->getChar()) == EOF) - goto err; - check = c & 0xff; - if ((c = str->getChar()) == EOF) - goto err; - check |= (c & 0xff) << 8; - if (check != (~blockLen & 0xffff)) - error(getPos(), "Bad uncompressed block length in flate stream"); - codeBuf = 0; - codeSize = 0; - - // compressed block with fixed codes - } else if (blockHdr == 1) { - compressedBlock = gTrue; - loadFixedCodes(); - - // compressed block with dynamic codes - } else if (blockHdr == 2) { - compressedBlock = gTrue; - if (!readDynamicCodes()) { - goto err; - } - - // unknown block type - } else { - goto err; - } - - endOfBlock = gFalse; - return gTrue; - -err: - error(getPos(), "Bad block header in flate stream"); - endOfBlock = eof = gTrue; - return gFalse; -} - -void FlateStream::loadFixedCodes() { - int i; - - // build the literal code table - for (i = 0; i <= 143; ++i) { - codeLengths[i] = 8; - } - for (i = 144; i <= 255; ++i) { - codeLengths[i] = 9; - } - for (i = 256; i <= 279; ++i) { - codeLengths[i] = 7; - } - for (i = 280; i <= 287; ++i) { - codeLengths[i] = 8; - } - compHuffmanCodes(codeLengths, flateMaxLitCodes, &litCodeTab); - - // build the distance code table - for (i = 0; i < flateMaxDistCodes; ++i) { - codeLengths[i] = 5; - } - compHuffmanCodes(codeLengths, flateMaxDistCodes, &distCodeTab); -} - -GBool FlateStream::readDynamicCodes() { - int numCodeLenCodes; - int numLitCodes; - int numDistCodes; - int codeLenCodeLengths[flateMaxCodeLenCodes]; - FlateHuffmanTab codeLenCodeTab; - int len, repeat, code; - int i; - - // read lengths - if ((numLitCodes = getCodeWord(5)) == EOF) { - goto err; - } - numLitCodes += 257; - if ((numDistCodes = getCodeWord(5)) == EOF) { - goto err; - } - numDistCodes += 1; - if ((numCodeLenCodes = getCodeWord(4)) == EOF) { - goto err; - } - numCodeLenCodes += 4; - if (numLitCodes > flateMaxLitCodes || - numDistCodes > flateMaxDistCodes || - numCodeLenCodes > flateMaxCodeLenCodes) { - goto err; - } - - // build the code length code table - for (i = 0; i < flateMaxCodeLenCodes; ++i) { - codeLenCodeLengths[i] = 0; - } - for (i = 0; i < numCodeLenCodes; ++i) { - if ((codeLenCodeLengths[codeLenCodeMap[i]] = getCodeWord(3)) == -1) { - goto err; - } - } - compHuffmanCodes(codeLenCodeLengths, flateMaxCodeLenCodes, &codeLenCodeTab); - - // build the literal and distance code tables - len = 0; - repeat = 0; - i = 0; - while (i < numLitCodes + numDistCodes) { - if ((code = getHuffmanCodeWord(&codeLenCodeTab)) == EOF) { - goto err; - } - if (code == 16) { - if ((repeat = getCodeWord(2)) == EOF) { - goto err; - } - for (repeat += 3; repeat > 0; --repeat) { - codeLengths[i++] = len; - } - } else if (code == 17) { - if ((repeat = getCodeWord(3)) == EOF) { - goto err; - } - len = 0; - for (repeat += 3; repeat > 0; --repeat) { - codeLengths[i++] = 0; - } - } else if (code == 18) { - if ((repeat = getCodeWord(7)) == EOF) { - goto err; - } - len = 0; - for (repeat += 11; repeat > 0; --repeat) { - codeLengths[i++] = 0; - } - } else { - codeLengths[i++] = len = code; - } - } - compHuffmanCodes(codeLengths, numLitCodes, &litCodeTab); - compHuffmanCodes(codeLengths + numLitCodes, numDistCodes, &distCodeTab); - - gfree(codeLenCodeTab.codes); - return gTrue; - -err: - error(getPos(), "Bad dynamic code table in flate stream"); - gfree(codeLenCodeTab.codes); - return gFalse; -} - -// Convert an array <lengths> of <n> lengths, in value order, into a -// Huffman code lookup table. -void FlateStream::compHuffmanCodes(int *lengths, int n, FlateHuffmanTab *tab) { - int tabSize, len, code, code2, skip, val, i, t; - - // find max code length - tab->maxLen = 0; - for (val = 0; val < n; ++val) { - if (lengths[val] > tab->maxLen) { - tab->maxLen = lengths[val]; - } - } - - // allocate the table - tabSize = 1 << tab->maxLen; - tab->codes = (FlateCode *)gmalloc(tabSize * sizeof(FlateCode)); - - // clear the table - for (i = 0; i < tabSize; ++i) { - tab->codes[i].len = 0; - tab->codes[i].val = 0; - } - - // build the table - for (len = 1, code = 0, skip = 2; - len <= tab->maxLen; - ++len, code <<= 1, skip <<= 1) { - for (val = 0; val < n; ++val) { - if (lengths[val] == len) { - - // bit-reverse the code - code2 = 0; - t = code; - for (i = 0; i < len; ++i) { - code2 = (code2 << 1) | (t & 1); - t >>= 1; - } - - // fill in the table entries - for (i = code2; i < tabSize; i += skip) { - tab->codes[i].len = (Gushort)len; - tab->codes[i].val = (Gushort)val; - } - - ++code; - } - } - } -} - -int FlateStream::getHuffmanCodeWord(FlateHuffmanTab *tab) { - FlateCode *code; - int c; - - while (codeSize < tab->maxLen) { - if ((c = str->getChar()) == EOF) { - break; - } - codeBuf |= (c & 0xff) << codeSize; - codeSize += 8; - } - code = &tab->codes[codeBuf & ((1 << tab->maxLen) - 1)]; - if (codeSize == 0 || codeSize < code->len || code->len == 0) { - return EOF; - } - codeBuf >>= code->len; - codeSize -= code->len; - return (int)code->val; -} - -int FlateStream::getCodeWord(int bits) { - int c; - - while (codeSize < bits) { - if ((c = str->getChar()) == EOF) - return EOF; - codeBuf |= (c & 0xff) << codeSize; - codeSize += 8; - } - c = codeBuf & ((1 << bits) - 1); - codeBuf >>= bits; - codeSize -= bits; - return c; -} - -//------------------------------------------------------------------------ -// EOFStream -//------------------------------------------------------------------------ - -EOFStream::EOFStream(Stream *strA): - FilterStream(strA) { -} - -EOFStream::~EOFStream() { - delete str; -} - -//------------------------------------------------------------------------ -// FixedLengthEncoder -//------------------------------------------------------------------------ - -FixedLengthEncoder::FixedLengthEncoder(Stream *strA, int lengthA): - FilterStream(strA) { - length = lengthA; - count = 0; -} - -FixedLengthEncoder::~FixedLengthEncoder() { - if (str->isEncoder()) - delete str; -} - -void FixedLengthEncoder::reset() { - str->reset(); - count = 0; -} - -void FixedLengthEncoder::close() { -} - -int FixedLengthEncoder::getChar() { - if (length >= 0 && count >= length) - return EOF; - ++count; - return str->getChar(); -} - -int FixedLengthEncoder::lookChar() { - if (length >= 0 && count >= length) - return EOF; - return str->getChar(); -} - -//------------------------------------------------------------------------ -// ASCIIHexEncoder -//------------------------------------------------------------------------ - -ASCIIHexEncoder::ASCIIHexEncoder(Stream *strA): - FilterStream(strA) { - bufPtr = bufEnd = buf; - lineLen = 0; - eof = gFalse; -} - -ASCIIHexEncoder::~ASCIIHexEncoder() { - if (str->isEncoder()) { - delete str; - } -} - -void ASCIIHexEncoder::reset() { - str->reset(); - bufPtr = bufEnd = buf; - lineLen = 0; - eof = gFalse; -} - -void ASCIIHexEncoder::close() { -} - -GBool ASCIIHexEncoder::fillBuf() { - static const char *hex = "0123456789abcdef"; - int c; - - if (eof) { - return gFalse; - } - bufPtr = bufEnd = buf; - if ((c = str->getChar()) == EOF) { - *bufEnd++ = '>'; - eof = gTrue; - } else { - if (lineLen >= 64) { - *bufEnd++ = '\n'; - lineLen = 0; - } - *bufEnd++ = hex[(c >> 4) & 0x0f]; - *bufEnd++ = hex[c & 0x0f]; - lineLen += 2; - } - return gTrue; -} - -//------------------------------------------------------------------------ -// ASCII85Encoder -//------------------------------------------------------------------------ - -ASCII85Encoder::ASCII85Encoder(Stream *strA): - FilterStream(strA) { - bufPtr = bufEnd = buf; - lineLen = 0; - eof = gFalse; -} - -ASCII85Encoder::~ASCII85Encoder() { - if (str->isEncoder()) - delete str; -} - -void ASCII85Encoder::reset() { - str->reset(); - bufPtr = bufEnd = buf; - lineLen = 0; - eof = gFalse; -} - -void ASCII85Encoder::close() { -} - -GBool ASCII85Encoder::fillBuf() { - Gulong t; - char buf1[5]; - int c; - int n, i; - - if (eof) - return gFalse; - t = 0; - for (n = 0; n < 4; ++n) { - if ((c = str->getChar()) == EOF) - break; - t = (t << 8) + c; - } - bufPtr = bufEnd = buf; - if (n > 0) { - if (n == 4 && t == 0) { - *bufEnd++ = 'z'; - if (++lineLen == 65) { - *bufEnd++ = '\n'; - lineLen = 0; - } - } else { - if (n < 4) - t <<= 8 * (4 - n); - for (i = 4; i >= 0; --i) { - buf1[i] = (char)(t % 85 + 0x21); - t /= 85; - } - for (i = 0; i <= n; ++i) { - *bufEnd++ = buf1[i]; - if (++lineLen == 65) { - *bufEnd++ = '\n'; - lineLen = 0; - } - } - } - } - if (n < 4) { - *bufEnd++ = '~'; - *bufEnd++ = '>'; - eof = gTrue; - } - return bufPtr < bufEnd; -} - -//------------------------------------------------------------------------ -// RunLengthEncoder -//------------------------------------------------------------------------ - -RunLengthEncoder::RunLengthEncoder(Stream *strA): - FilterStream(strA) { - bufPtr = bufEnd = nextEnd = buf; - eof = gFalse; -} - -RunLengthEncoder::~RunLengthEncoder() { - if (str->isEncoder()) - delete str; -} - -void RunLengthEncoder::reset() { - str->reset(); - bufPtr = bufEnd = nextEnd = buf; - eof = gFalse; -} - -void RunLengthEncoder::close() { -} - -// -// When fillBuf finishes, buf[] looks like this: -// +-----+--------------+-----------------+-- -// + tag | ... data ... | next 0, 1, or 2 | -// +-----+--------------+-----------------+-- -// ^ ^ ^ -// bufPtr bufEnd nextEnd -// -GBool RunLengthEncoder::fillBuf() { - int c, c1, c2; - int n; - - // already hit EOF? - if (eof) - return gFalse; - - // grab two bytes - if (nextEnd < bufEnd + 1) { - if ((c1 = str->getChar()) == EOF) { - eof = gTrue; - return gFalse; - } - } else { - c1 = bufEnd[0] & 0xff; - } - if (nextEnd < bufEnd + 2) { - if ((c2 = str->getChar()) == EOF) { - eof = gTrue; - buf[0] = 0; - buf[1] = c1; - bufPtr = buf; - bufEnd = &buf[2]; - return gTrue; - } - } else { - c2 = bufEnd[1] & 0xff; - } - - // check for repeat - c = 0; // make gcc happy - if (c1 == c2) { - n = 2; - while (n < 128 && (c = str->getChar()) == c1) - ++n; - buf[0] = (char)(257 - n); - buf[1] = c1; - bufEnd = &buf[2]; - if (c == EOF) { - eof = gTrue; - } else if (n < 128) { - buf[2] = c; - nextEnd = &buf[3]; - } else { - nextEnd = bufEnd; - } - - // get up to 128 chars - } else { - buf[1] = c1; - buf[2] = c2; - n = 2; - while (n < 128) { - if ((c = str->getChar()) == EOF) { - eof = gTrue; - break; - } - ++n; - buf[n] = c; - if (buf[n] == buf[n-1]) - break; - } - if (buf[n] == buf[n-1]) { - buf[0] = (char)(n-2-1); - bufEnd = &buf[n-1]; - nextEnd = &buf[n+1]; - } else { - buf[0] = (char)(n-1); - bufEnd = nextEnd = &buf[n+1]; - } - } - bufPtr = buf; - return gTrue; -} |