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+//C- -*- C++ -*-
+//C- -------------------------------------------------------------------
+//C- DjVuLibre-3.5
+//C- Copyright (c) 2002 Leon Bottou and Yann Le Cun.
+//C- Copyright (c) 2001 AT&T
+//C-
+//C- This software is subject to, and may be distributed under, the
+//C- GNU General Public License, Version 2. The license should have
+//C- accompanied the software or you may obtain a copy of the license
+//C- from the Free Software Foundation at http://www.fsf.org .
+//C-
+//C- This program is distributed in the hope that it will be useful,
+//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
+//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//C- GNU General Public License for more details.
+//C-
+//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
+//C- distributed by Lizardtech Software. On July 19th 2002, Lizardtech
+//C- Software authorized us to replace the original DjVu(r) Reference
+//C- Library notice by the following text (see doc/lizard2002.djvu):
+//C-
+//C- ------------------------------------------------------------------
+//C- | DjVu (r) Reference Library (v. 3.5)
+//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
+//C- | The DjVu Reference Library is protected by U.S. Pat. No.
+//C- | 6,058,214 and patents pending.
+//C- |
+//C- | This software is subject to, and may be distributed under, the
+//C- | GNU General Public License, Version 2. The license should have
+//C- | accompanied the software or you may obtain a copy of the license
+//C- | from the Free Software Foundation at http://www.fsf.org .
+//C- |
+//C- | The computer code originally released by LizardTech under this
+//C- | license and unmodified by other parties is deemed "the LIZARDTECH
+//C- | ORIGINAL CODE." Subject to any third party intellectual property
+//C- | claims, LizardTech grants recipient a worldwide, royalty-free,
+//C- | non-exclusive license to make, use, sell, or otherwise dispose of
+//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the
+//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU
+//C- | General Public License. This grant only confers the right to
+//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to
+//C- | the extent such infringement is reasonably necessary to enable
+//C- | recipient to make, have made, practice, sell, or otherwise dispose
+//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to
+//C- | any greater extent that may be necessary to utilize further
+//C- | modifications or combinations.
+//C- |
+//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
+//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
+//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+//C- +------------------------------------------------------------------
+//
+// $Id: JPEGDecoder.cpp,v 1.8 2003/11/07 22:08:22 leonb Exp $
+// $Name: release_3_5_15 $
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+#if NEED_GNUG_PRAGMAS
+# pragma implementation
+#endif
+
+#ifdef NEED_JPEG_DECODER
+
+#include "JPEGDecoder.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#undef HAVE_STDLIB_H
+#undef HAVE_STDDEF_H
+#include <stdio.h>
+#include <jconfig.h>
+#include <jpeglib.h>
+#include <jerror.h>
+#ifdef __cplusplus
+}
+#endif
+
+#include "ByteStream.h"
+#include "GPixmap.h"
+#ifdef LIBJPEGNAME
+#include "DjVuDynamic.h"
+#include "GString.h"
+#endif // LIBJPEGNAME
+
+
+
+#ifdef HAVE_NAMESPACES
+namespace DJVU {
+# ifdef NOT_DEFINED // Just to fool emacs c++ mode
+}
+#endif
+#endif
+
+
+class JPEGDecoder::Impl : public JPEGDecoder
+{
+public:
+ static void jpeg_byte_stream_src(j_decompress_ptr, ByteStream &);
+};
+
+extern "C"
+{
+
+struct djvu_error_mgr
+{
+ struct jpeg_error_mgr pub; /* "public" fields */
+
+ jmp_buf setjmp_buffer; /* for return to caller */
+};
+
+typedef struct djvu_error_mgr * djvu_error_ptr;
+
+METHODDEF(void)
+djvu_error_exit (j_common_ptr cinfo)
+{
+ /* cinfo->err really points to a djvu_error_mgr struct, so coerce pointer */
+ djvu_error_ptr djvuerr = (djvu_error_ptr) cinfo->err;
+
+ /* Always display the message. */
+ /* We could postpone this until after returning, if we chose. */
+ (*cinfo->err->output_message) (cinfo);
+
+ /* Return control to the setjmp point */
+ longjmp(djvuerr->setjmp_buffer, 1);
+}
+
+}
+
+GP<GPixmap>
+JPEGDecoder::decode(ByteStream & bs )
+{
+ GP<GPixmap> retval=GPixmap::create();
+ G_TRY
+ {
+ decode(bs,*retval);
+ } G_CATCH_ALL
+ {
+ retval=0;
+ }
+ G_ENDCATCH;
+ return retval;
+}
+
+void
+JPEGDecoder::decode(ByteStream & bs,GPixmap &pix)
+{
+ struct jpeg_decompress_struct cinfo;
+
+ /* We use our private extension JPEG error handler. */
+ struct djvu_error_mgr jerr;
+
+ JSAMPARRAY buffer; /* Output row buffer */
+ int row_stride; /* physical row width in output buffer */
+ int full_buf_size;
+ int isGrey,i;
+
+ cinfo.err = jpeg_std_error(&jerr.pub);
+
+ jerr.pub.error_exit = djvu_error_exit;
+
+ if (setjmp(jerr.setjmp_buffer))
+ {
+
+ jpeg_destroy_decompress(&cinfo);
+ G_THROW( ERR_MSG("GPixmap.unk_PPM") );
+ }
+
+ jpeg_create_decompress(&cinfo);
+
+ Impl::jpeg_byte_stream_src(&cinfo, bs);
+
+ (void) jpeg_read_header(&cinfo, TRUE);
+
+ jpeg_start_decompress(&cinfo);
+
+ /* We may need to do some setup of our own at this point before reading
+ * the data. After jpeg_start_decompress() we have the correct scaled
+ * output image dimensions available, as well as the output colormap
+ * if we asked for color quantization.
+ * In this example, we need to make an output work buffer of the right size.
+ */
+
+ /* JSAMPLEs per row in output buffer */
+ row_stride = cinfo.output_width * cinfo.output_components;
+ full_buf_size = row_stride * cinfo.output_height;
+
+ /* Make a one-row-high sample array that will go away when done with image */
+ buffer = (*cinfo.mem->alloc_sarray)
+ ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
+
+ GP<ByteStream> goutputBlock=ByteStream::create();
+ ByteStream &outputBlock=*goutputBlock;
+ outputBlock.format("P6\n%d %d\n%d\n",cinfo.output_width,
+ cinfo.output_height,255);
+
+ isGrey = ( cinfo.out_color_space == JCS_GRAYSCALE) ? 1 : 0;
+
+ while (cinfo.output_scanline < cinfo.output_height)
+ {
+ (void) jpeg_read_scanlines(&cinfo, buffer, 1);
+
+ if ( isGrey == 1 )
+ {
+ for (i=0; i<row_stride; i++)
+ {
+ outputBlock.write8((char)buffer[0][i]);
+ outputBlock.write8((char)buffer[0][i]);
+ outputBlock.write8((char)buffer[0][i]);
+ }
+ }else
+ {
+ for (i=0; i<row_stride; i++)
+ outputBlock.write8((char)buffer[0][i]);
+ }
+ }
+
+ (void) jpeg_finish_decompress(&cinfo);
+
+ jpeg_destroy_decompress(&cinfo);
+
+ outputBlock.seek(0,SEEK_SET);
+
+ pix.init(outputBlock);
+}
+
+/*** From here onwards code is to make ByteStream as the data
+ source for the JPEG library */
+
+extern "C"
+{
+
+typedef struct
+{
+ struct jpeg_source_mgr pub; /* public fields */
+
+ ByteStream * byteStream; /* source stream */
+ JOCTET * buffer; /* start of buffer */
+ boolean start_of_stream;
+} byte_stream_src_mgr;
+
+
+typedef byte_stream_src_mgr * byte_stream_src_ptr;
+
+#define INPUT_BUF_SIZE 4096
+
+METHODDEF(void)
+init_source (j_decompress_ptr cinfo)
+{
+ byte_stream_src_ptr src = (byte_stream_src_ptr) cinfo->src;
+
+ src->start_of_stream = TRUE;
+}
+
+METHODDEF(boolean)
+fill_input_buffer (j_decompress_ptr cinfo)
+{
+ byte_stream_src_ptr src = (byte_stream_src_ptr) cinfo->src;
+ size_t nbytes;
+
+ nbytes = src->byteStream->readall(src->buffer, INPUT_BUF_SIZE);
+
+ if (nbytes <= 0)
+ {
+ if (src->start_of_stream) /* Treat empty input as fatal error */
+ ERREXIT(cinfo, JERR_INPUT_EMPTY);
+ WARNMS(cinfo, JWRN_JPEG_EOF);
+ /* Insert a fake EOI marker */
+ src->buffer[0] = (JOCTET) 0xFF;
+ src->buffer[1] = (JOCTET) JPEG_EOI;
+ nbytes = 2;
+ }
+
+ src->pub.next_input_byte = src->buffer;
+ src->pub.bytes_in_buffer = nbytes;
+ src->start_of_stream = FALSE;
+
+ return TRUE;
+}
+
+
+METHODDEF(void)
+skip_input_data (j_decompress_ptr cinfo, long num_bytes)
+{
+ byte_stream_src_ptr src = (byte_stream_src_ptr) cinfo->src;
+
+ if (num_bytes > (long) src->pub.bytes_in_buffer)
+ {
+ src->byteStream->seek((num_bytes - src->pub.bytes_in_buffer), SEEK_CUR);
+ (void) fill_input_buffer(cinfo);
+ }else
+ {
+ src->pub.bytes_in_buffer -= num_bytes;
+ src->pub.next_input_byte += num_bytes;
+ }
+}
+
+METHODDEF(void)
+term_source (j_decompress_ptr cinfo)
+{
+ /* no work necessary here */
+}
+
+}
+
+void
+JPEGDecoder::Impl::jpeg_byte_stream_src(j_decompress_ptr cinfo,ByteStream &bs)
+{
+ byte_stream_src_ptr src;
+
+ if (cinfo->src == NULL)
+ { /* first time for this JPEG object? */
+ cinfo->src = (struct jpeg_source_mgr *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+ sizeof(byte_stream_src_mgr));
+ src = (byte_stream_src_ptr) cinfo->src;
+ src->buffer = (JOCTET *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+ INPUT_BUF_SIZE * sizeof(JOCTET));
+ }
+
+ src = (byte_stream_src_ptr) cinfo->src;
+ src->pub.init_source = init_source;
+ src->pub.fill_input_buffer = fill_input_buffer;
+ src->pub.skip_input_data = skip_input_data;
+ src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
+ src->pub.term_source = term_source;
+ src->byteStream = &bs;
+ src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
+ src->pub.next_input_byte = NULL; /* until buffer loaded */
+}
+
+#ifdef LIBJPEGNAME
+void *
+JPEGDecoder::jpeg_lookup(const GUTF8String &name)
+{
+ static DjVuDynamic lib(GUTF8String(LIBJPEGNAME));
+ void *sym=lib.lookup(name);
+ if(!sym)
+ G_THROW(ERR_MSG("DjVuFile.JPEG_bg2"));
+ return sym;
+}
+
+jpeg_error_mgr *
+JPEGDecoder::jpeg_std_error(jpeg_error_mgr *x)
+{
+ static void *sym=jpeg_lookup("jpeg_std_error");
+ return ((jpeg_error_mgr *(*)(jpeg_error_mgr *))sym)(x);
+}
+
+void
+JPEGDecoder::jpeg_CreateDecompress(jpeg_decompress_struct *x,int v, size_t s)
+{
+ static void *sym=jpeg_lookup("jpeg_CreateDecompress");
+ ((void (*)(jpeg_decompress_struct *,int,size_t))sym)(x,v,s);
+}
+
+void
+JPEGDecoder::jpeg_destroy_decompress(j_decompress_ptr x)
+{
+ static void *sym=jpeg_lookup("jpeg_destroy_decompress");
+ ((void (*)(j_decompress_ptr))sym)(x);
+}
+
+int
+JPEGDecoder::jpeg_read_header(j_decompress_ptr x,boolean y)
+{
+ static void *sym=jpeg_lookup("jpeg_read_header");
+ return ((int (*)(j_decompress_ptr,boolean))sym)(x,y);
+}
+
+JDIMENSION
+JPEGDecoder::jpeg_read_scanlines(j_decompress_ptr x,JSAMPARRAY y,JDIMENSION z)
+{
+ static void *sym=jpeg_lookup("jpeg_read_scanlines");
+ return ((JDIMENSION (*)(j_decompress_ptr,JSAMPARRAY,JDIMENSION))sym)(x,y,z);
+}
+
+boolean
+JPEGDecoder::jpeg_finish_decompress(j_decompress_ptr x)
+{
+ static void *sym=jpeg_lookup("jpeg_finish_decompress");
+ return ((boolean (*)(j_decompress_ptr))sym)(x);
+}
+
+boolean
+JPEGDecoder::jpeg_resync_to_restart(jpeg_decompress_struct *x,int d)
+{
+ static void *sym=jpeg_lookup("jpeg_resync_to_restart");
+ return ((boolean (*)(jpeg_decompress_struct *,int))sym)(x,d);
+}
+
+boolean
+JPEGDecoder::jpeg_start_decompress(j_decompress_ptr x)
+{
+ static void *sym=jpeg_lookup("jpeg_start_decompress");
+ return ((boolean (*)(j_decompress_ptr))sym)(x);
+}
+
+#endif // LIBJPEGNAME
+
+
+#ifdef HAVE_NAMESPACES
+}
+# ifndef NOT_USING_DJVU_NAMESPACE
+using namespace DJVU;
+# endif
+#endif
+
+#endif
+
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