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-rw-r--r--kpdf/xpdf/xpdf/Lexer.cc521
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diff --git a/kpdf/xpdf/xpdf/Lexer.cc b/kpdf/xpdf/xpdf/Lexer.cc
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index 1ef37175..00000000
--- a/kpdf/xpdf/xpdf/Lexer.cc
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-//========================================================================
-//
-// Lexer.cc
-//
-// Copyright 1996-2003 Glyph & Cog, LLC
-//
-//========================================================================
-
-#include <aconf.h>
-
-#ifdef USE_GCC_PRAGMAS
-#pragma implementation
-#endif
-
-#include <stdlib.h>
-#include <stddef.h>
-#include <string.h>
-#include <ctype.h>
-#include "Lexer.h"
-#include "Error.h"
-#include "XRef.h"
-
-//------------------------------------------------------------------------
-
-// A '1' in this array means the character is white space. A '1' or
-// '2' means the character ends a name or command.
-static char specialChars[256] = {
- 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, // 0x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1x
- 1, 0, 0, 0, 0, 2, 0, 0, 2, 2, 0, 0, 0, 0, 0, 2, // 2x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, // 3x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 4x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, // 5x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 6x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, // 7x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // ax
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // bx
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // cx
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // dx
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // ex
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 // fx
-};
-
-//------------------------------------------------------------------------
-// Lexer
-//------------------------------------------------------------------------
-
-Lexer::Lexer(XRef *xrefA, Stream *str) {
- Object obj;
-
- xref = xrefA;
-
- curStr.initStream(str);
- streams = new Array(xref);
- streams->add(curStr.copy(&obj));
- strPtr = 0;
- freeArray = gTrue;
- curStr.streamReset();
-}
-
-Lexer::Lexer(XRef *xrefA, Object *obj) {
- Object obj2;
-
- xref = xrefA;
-
- if (obj->isStream()) {
- streams = new Array(xref);
- freeArray = gTrue;
- streams->add(obj->copy(&obj2));
- } else {
- streams = obj->getArray();
- freeArray = gFalse;
- }
- strPtr = 0;
- if (streams->getLength() > 0) {
- streams->get(strPtr, &curStr);
- curStr.streamReset();
- }
-}
-
-Lexer::~Lexer() {
- if (!curStr.isNone()) {
- curStr.streamClose();
- curStr.free();
- }
- if (freeArray) {
- delete streams;
- }
-}
-
-int Lexer::getChar() {
- int c;
-
- c = EOF;
- while (!curStr.isNone() && (c = curStr.streamGetChar()) == EOF) {
- curStr.streamClose();
- curStr.free();
- ++strPtr;
- if (strPtr < streams->getLength()) {
- streams->get(strPtr, &curStr);
- curStr.streamReset();
- }
- }
- return c;
-}
-
-int Lexer::lookChar() {
- if (curStr.isNone()) {
- return EOF;
- }
- return curStr.streamLookChar();
-}
-
-Object *Lexer::getObj(Object *obj, int objNum) {
- char *p;
- int c, c2;
- GBool comment, neg, done;
- int numParen;
- int xi;
- double xf, scale;
- GString *s;
- int n, m;
-
- // skip whitespace and comments
- comment = gFalse;
- while (1) {
- if ((c = getChar()) == EOF) {
- return obj->initEOF();
- }
- if (comment) {
- if (c == '\r' || c == '\n')
- comment = gFalse;
- } else if (c == '%') {
- comment = gTrue;
- } else if (specialChars[c] != 1) {
- break;
- }
- }
-
- // start reading token
- switch (c) {
-
- // number
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- case '-': case '.':
- neg = gFalse;
- xi = 0;
- if (c == '-') {
- neg = gTrue;
- } else if (c == '.') {
- goto doReal;
- } else {
- xi = c - '0';
- }
- while (1) {
- c = lookChar();
- if (isdigit(c)) {
- getChar();
- xi = xi * 10 + (c - '0');
- } else if (c == '.') {
- getChar();
- goto doReal;
- } else {
- break;
- }
- }
- if (neg)
- xi = -xi;
- obj->initInt(xi);
- break;
- doReal:
- xf = xi;
- scale = 0.1;
- while (1) {
- c = lookChar();
- if (c == '-') {
- // ignore minus signs in the middle of numbers to match
- // Adobe's behavior
- error(getPos(), "Badly formatted number");
- getChar();
- continue;
- }
- if (!isdigit(c)) {
- break;
- }
- getChar();
- xf = xf + scale * (c - '0');
- scale *= 0.1;
- }
- if (neg)
- xf = -xf;
- obj->initReal(xf);
- break;
-
- // string
- case '(':
- p = tokBuf;
- n = 0;
- numParen = 1;
- done = gFalse;
- s = NULL;
- do {
- c2 = EOF;
- switch (c = getChar()) {
-
- case EOF:
-#if 0
- // This breaks some PDF files, e.g., ones from Photoshop.
- case '\r':
- case '\n':
-#endif
- error(getPos(), "Unterminated string");
- done = gTrue;
- break;
-
- case '(':
- ++numParen;
- c2 = c;
- break;
-
- case ')':
- if (--numParen == 0) {
- done = gTrue;
- } else {
- c2 = c;
- }
- break;
-
- case '\\':
- switch (c = getChar()) {
- case 'n':
- c2 = '\n';
- break;
- case 'r':
- c2 = '\r';
- break;
- case 't':
- c2 = '\t';
- break;
- case 'b':
- c2 = '\b';
- break;
- case 'f':
- c2 = '\f';
- break;
- case '\\':
- case '(':
- case ')':
- c2 = c;
- break;
- case '0': case '1': case '2': case '3':
- case '4': case '5': case '6': case '7':
- c2 = c - '0';
- c = lookChar();
- if (c >= '0' && c <= '7') {
- getChar();
- c2 = (c2 << 3) + (c - '0');
- c = lookChar();
- if (c >= '0' && c <= '7') {
- getChar();
- c2 = (c2 << 3) + (c - '0');
- }
- }
- break;
- case '\r':
- c = lookChar();
- if (c == '\n') {
- getChar();
- }
- break;
- case '\n':
- break;
- case EOF:
- error(getPos(), "Unterminated string");
- done = gTrue;
- break;
- default:
- c2 = c;
- break;
- }
- break;
-
- default:
- c2 = c;
- break;
- }
-
- if (c2 != EOF) {
- if (n == tokBufSize) {
- if (!s)
- s = new GString(tokBuf, tokBufSize);
- else
- s->append(tokBuf, tokBufSize);
- p = tokBuf;
- n = 0;
-
- // we are growing see if the document is not malformed and we are growing too much
- if (objNum > 0 && xref != NULL)
- {
- int newObjNum = xref->getNumEntry(curStr.streamGetPos());
- if (newObjNum != objNum)
- {
- error(getPos(), "Unterminated string");
- done = gTrue;
- delete s;
- n = -2;
- }
- }
- }
- *p++ = (char)c2;
- ++n;
- }
- } while (!done);
- if (n >= 0) {
- if (!s)
- s = new GString(tokBuf, n);
- else
- s->append(tokBuf, n);
- obj->initString(s);
- } else {
- obj->initEOF();
- }
- break;
-
- // name
- case '/':
- p = tokBuf;
- n = 0;
- s = NULL;
- while ((c = lookChar()) != EOF && !specialChars[c]) {
- getChar();
- if (c == '#') {
- c2 = lookChar();
- if (c2 >= '0' && c2 <= '9') {
- c = c2 - '0';
- } else if (c2 >= 'A' && c2 <= 'F') {
- c = c2 - 'A' + 10;
- } else if (c2 >= 'a' && c2 <= 'f') {
- c = c2 - 'a' + 10;
- } else {
- goto notEscChar;
- }
- getChar();
- c <<= 4;
- c2 = getChar();
- if (c2 >= '0' && c2 <= '9') {
- c += c2 - '0';
- } else if (c2 >= 'A' && c2 <= 'F') {
- c += c2 - 'A' + 10;
- } else if (c2 >= 'a' && c2 <= 'f') {
- c += c2 - 'a' + 10;
- } else {
- error(getPos(), "Illegal digit in hex char in name");
- }
- }
- notEscChar:
- if (n == tokBufSize) {
- if (!s)
- s = new GString(tokBuf, tokBufSize);
- else
- {
- // the spec says 127 is the maximum, we are already at 256 so bail out
- error(getPos(), "Name token too long");
- break;
- }
- p = tokBuf;
- n = 0;
- }
- *p++ = c;
- ++n;
- }
- *p = '\0';
- if (s) {
- s->append(tokBuf, n);
- obj->initName(s->getCString());
- delete s;
- } else obj->initName(tokBuf);
- break;
-
- // array punctuation
- case '[':
- case ']':
- tokBuf[0] = c;
- tokBuf[1] = '\0';
- obj->initCmd(tokBuf);
- break;
-
- // hex string or dict punctuation
- case '<':
- c = lookChar();
-
- // dict punctuation
- if (c == '<') {
- getChar();
- tokBuf[0] = tokBuf[1] = '<';
- tokBuf[2] = '\0';
- obj->initCmd(tokBuf);
-
- // hex string
- } else {
- p = tokBuf;
- m = n = 0;
- c2 = 0;
- s = NULL;
- while (1) {
- c = getChar();
- if (c == '>') {
- break;
- } else if (c == EOF) {
- error(getPos(), "Unterminated hex string");
- break;
- } else if (specialChars[c] != 1) {
- c2 = c2 << 4;
- if (c >= '0' && c <= '9')
- c2 += c - '0';
- else if (c >= 'A' && c <= 'F')
- c2 += c - 'A' + 10;
- else if (c >= 'a' && c <= 'f')
- c2 += c - 'a' + 10;
- else
- error(getPos(), "Illegal character <%02x> in hex string", c);
- if (++m == 2) {
- if (n == tokBufSize) {
- if (!s)
- s = new GString(tokBuf, tokBufSize);
- else
- s->append(tokBuf, tokBufSize);
- p = tokBuf;
- n = 0;
- }
- *p++ = (char)c2;
- ++n;
- c2 = 0;
- m = 0;
- }
- }
- }
- if (!s)
- s = new GString(tokBuf, n);
- else
- s->append(tokBuf, n);
- if (m == 1)
- s->append((char)(c2 << 4));
- obj->initString(s);
- }
- break;
-
- // dict punctuation
- case '>':
- c = lookChar();
- if (c == '>') {
- getChar();
- tokBuf[0] = tokBuf[1] = '>';
- tokBuf[2] = '\0';
- obj->initCmd(tokBuf);
- } else {
- error(getPos(), "Illegal character '>'");
- obj->initError();
- }
- break;
-
- // error
- case ')':
- case '{':
- case '}':
- error(getPos(), "Illegal character '%c'", c);
- obj->initError();
- break;
-
- // command
- default:
- p = tokBuf;
- *p++ = c;
- n = 1;
- while ((c = lookChar()) != EOF && !specialChars[c]) {
- getChar();
- if (++n == tokBufSize) {
- error(getPos(), "Command token too long");
- break;
- }
- *p++ = c;
- }
- *p = '\0';
- if (tokBuf[0] == 't' && !strcmp(tokBuf, "true")) {
- obj->initBool(gTrue);
- } else if (tokBuf[0] == 'f' && !strcmp(tokBuf, "false")) {
- obj->initBool(gFalse);
- } else if (tokBuf[0] == 'n' && !strcmp(tokBuf, "null")) {
- obj->initNull();
- } else {
- obj->initCmd(tokBuf);
- }
- break;
- }
-
- return obj;
-}
-
-void Lexer::skipToNextLine() {
- int c;
-
- while (1) {
- c = getChar();
- if (c == EOF || c == '\n') {
- return;
- }
- if (c == '\r') {
- if ((c = lookChar()) == '\n') {
- getChar();
- }
- return;
- }
- }
-}
-
-GBool Lexer::isSpace(int c) {
- return c >= 0 && c <= 0xff && specialChars[c] == 1;
-}
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