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campo-sirio/pdf/pdflib/p_jpeg.c
guy 3bf951f42c Patch level : 10.0 
Files correlati     : pdflib
Ricompilazione Demo : [ ]
Commento            :
Aggiornata pdflib.dll alla versione 7.0.4


git-svn-id: svn://10.65.10.50/trunk@18580 c028cbd2-c16b-5b4b-a496-9718f37d4682
2009-03-23 08:55:58 +00:00

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/*---------------------------------------------------------------------------*
| PDFlib - A library for generating PDF on the fly |
+---------------------------------------------------------------------------+
| Copyright (c) 1997-2006 Thomas Merz and PDFlib GmbH. All rights reserved. |
+---------------------------------------------------------------------------+
| |
| This software is subject to the PDFlib license. It is NOT in the |
| public domain. Extended versions and commercial licenses are |
| available, please check http://www.pdflib.com. |
| |
*---------------------------------------------------------------------------*/
/* $Id: p_jpeg.c,v 1.4 2009-03-23 08:51:17 guy Exp $
*
* JPEG processing for PDFlib
*
*/
#include "p_intern.h"
#include "p_color.h"
#include "p_image.h"
#ifndef PDF_JPEG_SUPPORTED
pdc_bool
pdf_is_JPEG_file(PDF *p, pdc_file *fp)
{
(void) p;
(void) fp;
return pdc_false;
}
int
pdf_process_JPEG_data(
PDF *p,
int imageslot)
{
(void) imageslot;
pdc_set_errmsg(p->pdc, PDF_E_UNSUPP_IMAGE, "JPEG", 0, 0, 0);
return -1;
}
void
pdf_cleanup_jpeg(PDF *p, pdf_image *image)
{
(void) p;
(void) image;
}
#else
#include "jinclude.h"
#include "jpeglib.h"
/*
* The following enum is stolen from the IJG JPEG library
* Comments added by tm.
* This table contains far too many names since PDFlib
* is rather simple-minded about markers.
*/
typedef enum { /* JPEG marker codes */
M_SOF0 = 0xc0, /* baseline DCT */
M_SOF1 = 0xc1, /* extended sequential DCT */
M_SOF2 = 0xc2, /* progressive DCT */
M_SOF3 = 0xc3, /* lossless (sequential) */
M_SOF5 = 0xc5, /* differential sequential DCT */
M_SOF6 = 0xc6, /* differential progressive DCT */
M_SOF7 = 0xc7, /* differential lossless */
M_JPG = 0xc8, /* JPEG extensions */
M_SOF9 = 0xc9, /* extended sequential DCT */
M_SOF10 = 0xca, /* progressive DCT */
M_SOF11 = 0xcb, /* lossless (sequential) */
M_SOF13 = 0xcd, /* differential sequential DCT */
M_SOF14 = 0xce, /* differential progressive DCT */
M_SOF15 = 0xcf, /* differential lossless */
M_DHT = 0xc4, /* define Huffman tables */
M_DAC = 0xcc, /* define arithmetic conditioning table */
M_RST0 = 0xd0, /* restart */
M_RST1 = 0xd1, /* restart */
M_RST2 = 0xd2, /* restart */
M_RST3 = 0xd3, /* restart */
M_RST4 = 0xd4, /* restart */
M_RST5 = 0xd5, /* restart */
M_RST6 = 0xd6, /* restart */
M_RST7 = 0xd7, /* restart */
M_SOI = 0xd8, /* start of image */
M_EOI = 0xd9, /* end of image */
M_SOS = 0xda, /* start of scan */
M_DQT = 0xdb, /* define quantization tables */
M_DNL = 0xdc, /* define number of lines */
M_DRI = 0xdd, /* define restart interval */
M_DHP = 0xde, /* define hierarchical progression */
M_EXP = 0xdf, /* expand reference image(s) */
M_APP0 = 0xe0, /* application marker, used for JFIF */
M_APP1 = 0xe1, /* application marker, used for Exif */
M_APP2 = 0xe2, /* application marker, used for FlashPix*
* and ICC Profiles */
M_APP3 = 0xe3, /* application marker */
M_APP4 = 0xe4, /* application marker */
M_APP5 = 0xe5, /* application marker */
M_APP6 = 0xe6, /* application marker */
M_APP7 = 0xe7, /* application marker */
M_APP8 = 0xe8, /* application marker, used for SPIFF */
M_APP9 = 0xe9, /* application marker */
M_APP10 = 0xea, /* application marker */
M_APP11 = 0xeb, /* application marker */
M_APP12 = 0xec, /* application marker */
M_APP13 = 0xed, /* application marker, used by Photoshop*/
M_APP14 = 0xee, /* application marker, used by Adobe */
M_APP15 = 0xef, /* application marker */
M_JPG0 = 0xf0, /* reserved for JPEG extensions */
M_JPG13 = 0xfd, /* reserved for JPEG extensions */
M_COM = 0xfe, /* comment */
M_TEM = 0x01 /* temporary use */
} JPEG_MARKER;
#define JPEG_SEGLIST_CHUNKSIZE 64
#define JPEG_MARKER_LEN 2
#define JPEG_LENGTH_LEN 2
#define JPEG_BUFSIZE 0xFFFF
struct pdf_jpeg_segment_s
{
long pos; /* position of segment */
size_t length; /* length of segement in byte */
};
static void
pdf_register_JPEG_segment(PDF *p, pdf_image *image, long pos, size_t length)
{
static const char fn[] = "pdf_register_JPEG_segment";
pdf_jpeg_info *jpeg = &image->info.jpeg;
size_t len;
pdc_logg_cond(p->pdc, 5, trc_image,
"\t\tKeep segment, position = 0x%lX, length = 0x%lX(%ld)\n",
pos, length, length);
while(length > 0)
{
len = length;
if (len > JPEG_BUFSIZE)
len = JPEG_BUFSIZE;
if (jpeg->number >= jpeg->capacity)
{
if (jpeg->capacity == 0)
{
jpeg->capacity = JPEG_SEGLIST_CHUNKSIZE;
jpeg->seglist = (pdf_jpeg_segment *) pdc_malloc(p->pdc,
jpeg->capacity * sizeof(pdf_jpeg_segment), fn);
}
else
{
jpeg->capacity += JPEG_SEGLIST_CHUNKSIZE;
jpeg->seglist = (pdf_jpeg_segment *) pdc_realloc(p->pdc,
jpeg->seglist, jpeg->capacity* sizeof(pdf_jpeg_segment), fn);
}
}
jpeg->seglist[jpeg->number].pos = pos;
jpeg->seglist[jpeg->number].length = len;
jpeg->number++;
length -= len;
pos += len;
}
}
static void
pdf_data_source_JPEG_init(PDF *p, PDF_data_source *src)
{
static const char fn[] = "pdf_data_source_JPEG_init";
pdf_image *image;
pdf_jpeg_info *jpeg;
image = (pdf_image *) src->private_data;
jpeg = &image->info.jpeg;
jpeg->capacity = jpeg->number;
jpeg->number = 0;
src->buffer_start = (pdc_byte *) pdc_malloc(p->pdc, JPEG_BUFSIZE, fn);
src->buffer_length = JPEG_BUFSIZE;
}
static pdc_bool
pdf_data_source_JPEG_fill(PDF *p, PDF_data_source *src)
{
pdf_image *image;
pdf_jpeg_info *jpeg;
size_t length;
long pos;
(void) p;
image = (pdf_image *) src->private_data;
jpeg = &image->info.jpeg;
if (jpeg->number < jpeg->capacity)
{
pos = jpeg->seglist[jpeg->number].pos;
length = jpeg->seglist[jpeg->number].length;
jpeg->number++;
pdc_fseek(image->fp, pos, SEEK_SET);
src->next_byte = src->buffer_start;
src->bytes_available =
pdc_fread(src->buffer_start, 1, length, image->fp);
}
else
{
src->bytes_available = 0;
}
if (src->bytes_available == 0)
return pdc_false;
else
return pdc_true;
}
static void
pdf_data_source_JPEG_terminate(PDF *p, PDF_data_source *src)
{
pdc_free(p->pdc, (void *) src->buffer_start);
}
/**********************************************************************
*
* Decompression data source routines for the case of
* reading JPEG data from a PDFlib virtual file in
* JPEG library - analogous to ../libs/jpeg/jdatasrc.c
*
**********************************************************************/
typedef struct
{
struct jpeg_source_mgr pub; /* public fields */
pdc_file *infile;
PDF *p; /* required for logging only */
pdf_image *image; /* required for access to the filename */
}
pdf_source_mgr;
typedef pdf_source_mgr * pdf_src_ptr;
static void
pdf_init_JPEG_source (j_decompress_ptr cinfo)
{
(void) cinfo;
}
static boolean
pdf_fill_JPEG_input_buffer (j_decompress_ptr cinfo)
{
pdf_src_ptr src = (pdf_src_ptr) cinfo->src;
JOCTET *buffer;
size_t nbytes;
buffer = (JOCTET *) pdc_freadall(src->infile, &nbytes, NULL);
src->pub.next_input_byte = buffer;
src->pub.bytes_in_buffer = nbytes;
return TRUE;
}
static void
pdf_skip_JPEG_input_data (j_decompress_ptr cinfo, long num_bytes)
{
pdf_src_ptr src = (pdf_src_ptr) cinfo->src;
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
static void
pdf_term_JPEG_source (j_decompress_ptr cinfo)
{
(void) cinfo;
}
static void
pdf_jpeg_pdcread_src(j_decompress_ptr cinfo,
PDF *p, pdc_file *infile, pdf_image *image)
{
pdf_src_ptr src;
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
SIZEOF(pdf_source_mgr));
src = (pdf_src_ptr) cinfo->src;
src->pub.init_source = pdf_init_JPEG_source;
src->pub.fill_input_buffer = pdf_fill_JPEG_input_buffer;
src->pub.skip_input_data = pdf_skip_JPEG_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = pdf_term_JPEG_source;
src->infile = infile;
src->p = p;
src->image = image;
src->pub.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
}
/**********************************************************************
*
* Compression data destination routines for the case of
* emitting JPEG data to a open PDFlib PDF file in
* JPEG library - analogous to ../libs/jpeg/jdatadst.c
*
**********************************************************************/
typedef struct
{
struct jpeg_destination_mgr pub;
PDF *p;
pdf_image *image; /* required for access to the filename */
JOCTET *buffer;
}
pdf_destination_mgr;
typedef pdf_destination_mgr * pdf_dest_ptr;
#define OUTPUT_BUF_SIZE 4096
static void
pdf_init_JPEG_destination (j_compress_ptr cinfo)
{
pdf_dest_ptr dest = (pdf_dest_ptr) cinfo->dest;
dest->buffer = (JOCTET *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
OUTPUT_BUF_SIZE * SIZEOF(JOCTET));
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
}
static boolean
pdf_empty_JPEG_output_buffer (j_compress_ptr cinfo)
{
pdf_dest_ptr dest = (pdf_dest_ptr) cinfo->dest;
pdc_write(dest->p->out, dest->buffer, OUTPUT_BUF_SIZE);
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
return TRUE;
}
static void
pdf_term_JPEG_destination (j_compress_ptr cinfo)
{
pdf_dest_ptr dest = (pdf_dest_ptr) cinfo->dest;
size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
if (datacount)
pdc_write(dest->p->out, dest->buffer, datacount);
}
static void
pdf_jpeg_pdcwrite_dest(j_compress_ptr cinfo, PDF *p, pdf_image *image)
{
pdf_dest_ptr dest;
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
SIZEOF(pdf_destination_mgr));
dest = (pdf_dest_ptr) cinfo->dest;
dest->pub.init_destination = pdf_init_JPEG_destination;
dest->pub.empty_output_buffer = pdf_empty_JPEG_output_buffer;
dest->pub.term_destination = pdf_term_JPEG_destination;
dest->p = p;
dest->image = image;
}
/**********************************************************************/
#define PDF_JMSG_LENGTH_MAX 200
/*
* Private replacements for libjpeg's error message function.
* They serve two purposes:
* - avoid libjpeg writing to stderr
* - write the message to the log file if logging is enabled
* One function is required for each source and destination.
*/
static void
pdf_output_message_src(j_common_ptr cinfo)
{
char buffer[PDF_JMSG_LENGTH_MAX];
/* we use this method only for decompression objects */
j_decompress_ptr cinfo2 = (j_decompress_ptr) cinfo;
pdf_source_mgr *src = (pdf_source_mgr *) cinfo2->src;
if (!pdc_logg_is_enabled(src->p->pdc, 5, trc_image))
return;
/* Create the message */
(*cinfo->err->format_message) (cinfo, buffer);
pdc_logg(src->p->pdc, "\tlibjpeg src: %s\n", buffer);
}
static void
pdf_output_message_dst(j_common_ptr cinfo)
{
char buffer[PDF_JMSG_LENGTH_MAX];
/* we use this method only for compression objects */
j_compress_ptr cinfo2 = (j_compress_ptr) cinfo;
pdf_destination_mgr *dst = (pdf_destination_mgr *) cinfo2->dest;
if (!pdc_logg_is_enabled(dst->p->pdc, 5, trc_image))
return;
/* Create the message */
(*cinfo->err->format_message) (cinfo, buffer);
pdc_logg(dst->p->pdc, "\tlibjpeg dst: %s\n", buffer);
}
/*
* Private replacements for libjpeg's error_exit function.
* They serve three purposes:
* - avoid libjpeg exiting
* - write a message to the log file if logging is enabled
* - return control from libjpeg by raising an exception
* One function is required for each source and destination.
*/
static void
pdf_error_exit_src(j_common_ptr cinfo)
{
PDF *p;
pdf_image *image;
char buffer[PDF_JMSG_LENGTH_MAX];
/* we use this method only for decompression objects */
j_decompress_ptr cinfo2 = (j_decompress_ptr) cinfo;
pdf_source_mgr *src = (pdf_source_mgr *) cinfo2->src;
p = src->p;
image = src->image;
(*cinfo->err->output_message) (cinfo);
(*cinfo->err->format_message) (cinfo, buffer);
if (pdc_logg_is_enabled(p->pdc, 5, trc_image))
pdc_logg(p->pdc, "\tlibjpeg (src) called error_exit routine\n");
/* clean up libjpeg */
jpeg_destroy(cinfo);
pdc_error(p->pdc, PDF_E_JPEG_TRANSCODE,
pdc_errprintf(p->pdc, "%.*s", PDC_ERR_MAXSTRLEN, image->filename),
buffer, 0, 0);
}
static void
pdf_error_exit_dst(j_common_ptr cinfo)
{
PDF *p;
pdf_image *image;
char buffer[PDF_JMSG_LENGTH_MAX];
/* we use this method only for compression objects */
j_compress_ptr cinfo2 = (j_compress_ptr) cinfo;
pdf_destination_mgr *dst = (pdf_destination_mgr *) cinfo2->dest;
p = dst->p;
image = dst->image;
(*cinfo->err->output_message) (cinfo);
(*cinfo->err->format_message) (cinfo, buffer);
if (pdc_logg_is_enabled(p->pdc, 5, trc_image))
pdc_logg(p->pdc, "\tlibjpeg (dst) called error_exit routine\n");
/* clean up libjpeg */
jpeg_destroy(cinfo);
pdc_error(p->pdc, PDF_E_JPEG_TRANSCODE,
pdc_errprintf(p->pdc, "%.*s", PDC_ERR_MAXSTRLEN, image->filename),
buffer, 0, 0);
}
static pdc_bool
pdf_data_source_JPEG_fill_transcode(PDF *p, PDF_data_source *src)
{
pdf_image *image = (pdf_image *) src->private_data;
pdc_bool logg5 = pdc_logg_is_enabled(p->pdc, 5, trc_image);
struct jpeg_decompress_struct srcinfo;
struct jpeg_compress_struct dstinfo;
jvirt_barray_ptr * src_coef_arrays;
struct jpeg_error_mgr jsrcerr, jdsterr;
/* ---------- Setup for decompression ---------- */
/* Initialize the JPEG decompression object with default error handling. */
srcinfo.err = jpeg_std_error(&jsrcerr);
/* Hook up our own message handler for logging */
srcinfo.err->output_message = pdf_output_message_src;
/* Hook up our own fatal error handler */
srcinfo.err->error_exit = pdf_error_exit_src;
/* Extended libjpeg tracing if PDFlib logging is enabled */
if (logg5)
srcinfo.err->trace_level = 5;
jpeg_create_decompress(&srcinfo);
/* Specify data source for decompression analogous to jpeg_stdio_src */
pdf_jpeg_pdcread_src(&srcinfo, p, image->fp, image);
/* ---------- Setup for compression ---------- */
/* Initialize the JPEG compression object with default error handling. */
dstinfo.err = jpeg_std_error(&jdsterr);
/* Hook up our own message handler for logging */
dstinfo.err->output_message = pdf_output_message_dst;
/* Hook up our own fatal error handler */
dstinfo.err->error_exit = pdf_error_exit_dst;
/* Extended libjpeg tracing if PDFlib logging is enabled */
if (logg5)
dstinfo.err->trace_level = 5;
jpeg_create_compress(&dstinfo);
PDC_TRY(p->pdc)
{
/* ---------- start transcoding ---------- */
/* Read file header */
if (jpeg_read_header(&srcinfo, TRUE) != JPEG_HEADER_OK)
{
if (logg5)
pdc_logg(p->pdc, "\tlibjpeg couldn't read header\n");
pdc_error(p->pdc, PDF_E_IMAGE_CORRUPT, "JPEG",
pdc_errprintf(p->pdc, "%.*s", PDC_ERR_MAXSTRLEN,
image->filename), 0, 0);
}
/* Read source file as DCT coefficients */
src_coef_arrays = jpeg_read_coefficients(&srcinfo);
if (src_coef_arrays == NULL)
{
if (logg5)
pdc_logg(p->pdc, "\tlibjpeg couldn't read coefficients\n");
pdc_error(p->pdc, PDF_E_IMAGE_CORRUPT, "JPEG",
pdc_errprintf(p->pdc, "%.*s", PDC_ERR_MAXSTRLEN,
image->filename), 0, 0);
}
/* Initialize destination compression parameters from source values */
jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
/* Specify data destination for compression analogous to
* jpeg_stdio_dest
*/
pdf_jpeg_pdcwrite_dest(&dstinfo, p, image);
/* Start compressor (note no image data is actually written here) */
jpeg_write_coefficients(&dstinfo, src_coef_arrays);
/* Finish compression */
/* DON'T change the order! */
jpeg_finish_compress(&dstinfo);
(void) jpeg_finish_decompress(&srcinfo);
}
PDC_CATCH(p->pdc)
{
image->corrupt = pdc_true;
}
/* Release memory */
jpeg_destroy_compress(&dstinfo);
jpeg_destroy_decompress(&srcinfo);
/* All done. Check for errors */
if (jsrcerr.num_warnings != 0 && logg5)
{
/*
* We don't really care about problems in the input since
* they will be fixed by transcoding. Log them, but don't throw an
* exception.
*/
pdc_logg(p->pdc,
"\tlibjpeg total: %d corrupt data warning(s)\n",
jsrcerr.num_warnings);
}
if (jdsterr.num_warnings != 0)
{
char buffer[PDF_JMSG_LENGTH_MAX];
/*
* Errors in the output are rare, but fatal. Log them,
* and unconditionally throw an exception.
*/
if (logg5)
{
pdc_logg(p->pdc, "\tlibjpeg: %d warning(s) for output\n",
jdsterr.num_warnings);
}
(dstinfo.err->format_message) ((j_common_ptr) &dstinfo, buffer);
pdc_set_errmsg(p->pdc, PDF_E_JPEG_TRANSCODE,
pdf_get_image_filename(p, image), buffer, 0, 0);
image->corrupt = pdc_true;
}
return pdc_false;
}
static pdc_ushort
get_ushort(pdc_file *fp)
{
pdc_byte c[2];
c[0] = (pdc_byte) pdc_fgetc(fp);
c[1] = (pdc_byte) pdc_fgetc(fp);
return pdc_get_be_ushort(c);
}
#define CHECK_LENGTH 1024L
pdc_bool
pdf_is_JPEG_file(PDF *p, pdc_file *fp)
{
long pos = 0L;
int c;
long start = (long) pdc_ftell(fp);
long check_length = start + CHECK_LENGTH;
pdc_logg_cond(p->pdc, 1, trc_image, "\tChecking image type JPEG...\n");
#if !defined(MVS) || !defined(I370)
/* Tommy's special trick for Macintosh JPEGs: simply skip some */
/* hundred bytes at the beginning of the file! */
do
{
do /* skip if not FF */
{
c = pdc_fgetc(fp);
pos++;
}
while (!pdc_feof(fp) && c != 0xFF && pos < check_length);
if (pdc_feof(fp) || pos >= check_length)
{
pdc_fseek(fp, start, SEEK_SET);
return pdc_false;
}
do /* skip repeated FFs */
{
c = pdc_fgetc(fp);
pos++;
}
while (c == 0xFF && pos < check_length);
/* remember start position */
pos = (pdc_off_t1) pdc_ftell(fp);
if (pos < 0L || pos >= check_length)
{
pdc_fseek(fp, start, SEEK_SET);
return pdc_false;
}
pos -= JPEG_MARKER_LEN; /* subtract marker length */
if (c == M_SOI)
{
pdc_fseek(fp, pos, SEEK_SET);
break;
}
}
while (!pdc_feof(fp));
#endif /* !MVS || !I370 */
#define BOGUS_LENGTH 768
/* If we are that far from the start we consider the image as damaged if:
* - OJPEG-TIFF: it does not start at the alleged data offset
* - any other flavor: it has too much garbage at the beginning
*/
if (pdc_feof(fp) || pos > (start ? start : BOGUS_LENGTH))
{
pdc_fseek(fp, start, SEEK_SET);
return pdc_false;
}
return pdc_true;
}
/* This function should be moved to p_color.c once it gets used by other
* image modules as well.
*/
static void
pdf_log_colorspace(PDF *p, int slot)
{
pdf_colorspace *cs;
if (slot < 0 || slot >= p->colorspaces_number)
{
pdc_logg(p->pdc, " Bad color space slot %d", slot);
}
cs = &p->colorspaces[slot];
switch (cs->type) {
case DeviceGray:
pdc_logg(p->pdc, "/DeviceGray");
break;
case DeviceRGB:
pdc_logg(p->pdc, "/DeviceRGB");
break;
case DeviceCMYK:
pdc_logg(p->pdc, "/DeviceCMYK");
break;
case Indexed:
pdc_logg(p->pdc, "/Indexed");
break;
case PatternCS:
pdc_logg(p->pdc, "/Pattern");
break;
default:
pdc_logg(p->pdc, "%d (unknown)", cs->type);
}
}
/* open JPEG image and analyze marker */
int
pdf_process_JPEG_data(
PDF *p,
int imageslot)
{
int c, unit;
unsigned long length, len = 0, slen;
#define APP_MAX 255
pdc_byte appstring[APP_MAX];
const char *filename = NULL;
pdc_bool ismem = pdc_false;
void *filebase = NULL;
size_t filelen;
pdf_image *image;
int transform = 0;
pdc_bool marker_found = pdc_false;
pdc_bool markers_done = pdc_false;
pdc_bool need_transcode = pdc_false;
pdc_bool logg5 = pdc_logg_is_enabled(p->pdc, 5, trc_image);
long pos = 0, endpos = 0;
long adobe_pos = 0, adobe_len = 0;
int errint = 0;
int errcode = 0;
image = &p->images[imageslot];
image->compression = pdf_comp_dct;
image->use_raw = pdc_true;
image->info.jpeg.virtfile = NULL;
image->info.jpeg.seglist = NULL;
image->info.jpeg.capacity = 0;
image->info.jpeg.number = 0;
need_transcode = !image->passthrough;
if (logg5)
{
pdc_logg(p->pdc, "\tjpegoptimize = %s\n",
image->jpegoptimize ? "true" : "false");
if (need_transcode)
pdc_logg(p->pdc, "\ttranscoding...\n");
else
pdc_logg(p->pdc, "\ttranscoding disabled by passthrough option\n");
}
/* jpeg file not available */
if (image->reference != pdf_ref_direct)
{
image->in_use = pdc_true; /* mark slot as used */
pdf_put_image(p, imageslot, pdc_true, pdc_true);
return imageslot;
}
if (!pdc_file_isvirtual(image->fp))
{
/* read whole file */
filebase = (void *) pdc_freadall(image->fp, &filelen, &ismem);
if (filebase == NULL)
{
errcode = PDC_E_IO_READ;
goto PDF_JPEG_ERROR;
}
pdc_fclose(image->fp);
/* temporary memory */
pdc_insert_mem_tmp(p->pdc, filebase, 0, 0);
/* create virtual image file */
filename = "__jpeg__image__data__";
pdc__create_pvf(p->pdc, filename, filebase, filelen, "");
image->info.jpeg.virtfile = filename;
if (logg5)
{
pdc_logg(p->pdc, "\tVirtual file created, "
"length = 0x%lX(%ld)\n", filelen, filelen);
}
/* open virtual file */
image->fp = pdc_fsearch_fopen(p->pdc, filename, NULL, "",
PDC_FILE_BINARY);
}
if (image->info.jpeg.jpegifoffset)
{
/* Just to be sure: if we were handed a OJPEG-compressed TIFF with
* an offset we let libjpeg transcode.
*/
need_transcode = pdc_true;
if (logg5)
{
pdc_logg(p->pdc,
"\ttranscoding because of OJPEG-compressed TIFF\n");
pdc_logg(p->pdc,
"\tseeking to base offset 0x%lX(%ld) (TIFF with OJPEG)\n",
image->info.jpeg.jpegifoffset, image->info.jpeg.jpegifoffset);
}
pdc_fseek(image->fp, image->info.jpeg.jpegifoffset, SEEK_SET);
}
if (pdf_is_JPEG_file(p, image->fp) == pdc_false)
{
errcode = PDF_E_IMAGE_CORRUPT;
goto PDF_JPEG_ERROR;
}
/* JPEG marker loop */
while (1)
{
/* look for next JPEG Marker */
if (!markers_done)
{
do /* repeat if FF/00 */
{
do /* skip to FF */
{
if (pdc_feof(image->fp))
{
errcode = PDF_E_IMAGE_CORRUPT;
goto PDF_JPEG_ERROR;
}
c = pdc_fgetc(image->fp);
}
while (c != 0xFF);
do /* skip repeated FFs */
{
if (pdc_feof(image->fp))
{
errcode = PDF_E_IMAGE_CORRUPT;
goto PDF_JPEG_ERROR;
}
c = pdc_fgetc(image->fp);
}
while (c == 0xFF);
}
while (c == 0);
/* start of new segment */
pos = (pdc_off_t1) pdc_ftell(image->fp) - JPEG_MARKER_LEN;
/* skip garbage at the start of image data */
if (!marker_found && pos > 0)
{
if (logg5 && pos > (long) image->info.jpeg.jpegifoffset)
{
pdc_logg(p->pdc, "\t0x%lX(%ld) bytes garbage "
"at start of image\n", pos, pos);
}
/* we must create a new virtual file */
if (image->info.jpeg.virtfile == 0)
{
/* read whole file */
filebase = (void *) pdc_freadall(image->fp,
&filelen, &ismem);
if (filebase == NULL)
{
errcode = PDC_E_IO_READ;
goto PDF_JPEG_ERROR;
}
/* temporary memory */
pdc_insert_mem_tmp(p->pdc, filebase, 0, 0);
filename = "__jpeg__image__data__";
}
else
{
/* delete virtual file */
pdc__delete_pvf(p->pdc, image->info.jpeg.virtfile);
}
/* [re]create virtual file */
filelen -= pos;
memmove(filebase, (char *) filebase + pos, filelen);
pdc__create_pvf(p->pdc, filename, filebase, filelen, "");
image->info.jpeg.virtfile = filename;
if (logg5)
{
pdc_logg(p->pdc, "\tVirtual file created, "
"length = 0x%lX(%ld)\n",
filelen, filelen);
}
/* [re]open virtual file */
pdc_fclose(image->fp);
image->fp = pdc_fsearch_fopen(p->pdc, filename, NULL, "",
PDC_FILE_BINARY);
/* restart with the cleaned file */
continue;
}
length = 0;
marker_found = pdc_true;
}
else
{
/* enforcing end of image */
pos = (pdc_off_t1) pdc_ftell(image->fp);
pdc_fseek(image->fp, 0L, SEEK_END);
endpos = (pdc_off_t1) pdc_ftell(image->fp) - JPEG_MARKER_LEN;
length = endpos - pos;
c = M_EOI;
}
/* analyzing JPEG Marker */
switch (c)
{
/* markers which are not supported in PDF 1.3 and above */
case M_SOF3:
case M_SOF5:
case M_SOF6:
case M_SOF7:
case M_SOF9:
case M_SOF11:
case M_SOF13:
case M_SOF14:
case M_SOF15:
{
if (logg5)
{
pdc_logg(p->pdc, "\tMarker 0x%X(SOF%d) found - "
"not supported\n", c, c - M_SOF0);
}
errint = c;
errcode = PDF_E_JPEG_COMPRESSION;
}
goto PDF_JPEG_ERROR;
/* markers without any parameters */
case M_SOI:
case M_TEM:
case M_EOI:
case M_RST0:
case M_RST1:
case M_RST2:
case M_RST3:
case M_RST4:
case M_RST5:
case M_RST6:
case M_RST7:
{
if (logg5)
{
pdc_logg(p->pdc, "\tMarker 0x%X", c);
if (c == M_EOI)
pdc_logg(p->pdc, "(EOI)");
pdc_logg(p->pdc, " found - no contents\n");
}
pdf_register_JPEG_segment(p, image, pos,
(size_t) (length + JPEG_MARKER_LEN));
}
break;
/* skip segment if jpegoptimize = true, otherwise keep */
case M_APP0:
case M_APP1:
case M_APP2:
case M_APP3:
case M_APP4:
case M_APP5:
case M_APP6:
case M_APP7:
case M_APP8:
case M_APP9:
case M_APP10:
case M_APP11:
case M_APP12:
case M_APP13:
case M_APP14:
case M_APP15:
case M_COM:
{
if (logg5)
{
pdc_logg(p->pdc, "\tMarker 0x%X", c);
if (c == M_COM)
pdc_logg(p->pdc, "(COM) found\n");
else
pdc_logg(p->pdc, "(APP%d) found\n", c - M_APP0);
}
length = get_ushort(image->fp);
if (!image->jpegoptimize)
pdf_register_JPEG_segment(p, image, pos,
(size_t) (length + JPEG_MARKER_LEN));
else if (logg5)
pdc_logg(p->pdc, "\t\tSkip segment, position=0x%lX, "
"length=0x%lX(%ld)\n",
pos, length, length);
/* We may have to register the Adobe marker later */
if (c == M_APP14)
{
adobe_pos = pos;
adobe_len = length;
}
length -= JPEG_LENGTH_LEN;
}
break;
/* keep segment unconditionally */
case M_SOF0:
case M_SOF1:
case M_SOF2:
case M_SOF10:
case M_SOS:
default:
{
if (logg5)
{
pdc_logg(p->pdc, "\tMarker 0x%X", c);
if (c == M_SOS)
pdc_logg(p->pdc, "(SOS) found\n");
else if (c <= M_SOF15)
pdc_logg(p->pdc, "(SOF%d) found\n", c - M_SOF0);
else
pdc_logg(p->pdc, " found\n");
}
length = get_ushort(image->fp);
pdf_register_JPEG_segment(p, image, pos,
(size_t) (length + JPEG_MARKER_LEN));
length -= JPEG_LENGTH_LEN;
}
break;
}
/* end of image */
if (c == M_EOI)
{
if (logg5)
{
pdc_logg(p->pdc, "\tEnd of image\n");
}
break;
}
/* processing JPEG Marker */
switch (c)
{
/* check for frame header markers */
case M_SOF0:
case M_SOF1:
case M_SOF2:
case M_SOF10:
{
int comp;
image->bpc = pdc_fgetc(image->fp);
image->height = (pdc_scalar) get_ushort(image->fp);
image->width = (pdc_scalar) get_ushort(image->fp);
image->components = pdc_fgetc(image->fp);
length -= 6;
for (comp=0; comp<image->components; comp++)
{
pdc_byte b;
/* We don't support more than 4 components */
if (comp==JPEG_MAX_COMPS) break;
image->info.jpeg.id[comp] = pdc_fgetc(image->fp);
b = pdc_fgetc(image->fp);
image->info.jpeg.hsamp[comp] = (b >> 4) & 0x0F;
image->info.jpeg.vsamp[comp] = b & 0x0F;
image->info.jpeg.table[comp] = pdc_fgetc(image->fp);
length -= 3;
}
/*
* No need to read more markers since multiscan detection
* not required for single-component images.
*/
if (image->components == 1)
markers_done = pdc_true;
if (logg5)
{
pdc_logg(p->pdc, "\t\tbpc = %d\n", image->bpc);
pdc_logg(p->pdc, "\t\theight = %g\n", image->height);
pdc_logg(p->pdc, "\t\twidth = %g\n", image->width);
pdc_logg(p->pdc, "\t\tcomponents = %d\n",
image->components);
for (comp=0; comp<image->components; comp++)
{
if (comp==JPEG_MAX_COMPS)
{
pdc_logg(p->pdc, "\t\tMore components found\n");
break;
}
if (pdc_logg_isprint((int) image->info.jpeg.id[comp]))
{
pdc_logg(p->pdc,
"\t\tcomponent 0x%x (name='%c'): "
"%dhx%dv table=%d\n",
image->info.jpeg.id[comp],
image->info.jpeg.id[comp],
image->info.jpeg.hsamp[comp],
image->info.jpeg.vsamp[comp],
image->info.jpeg.table[comp]);
}
else
{
pdc_logg(p->pdc,
"\t\tcomponent 0x%x: %dhx%dv table=%d\n",
image->info.jpeg.id[comp],
image->info.jpeg.hsamp[comp],
image->info.jpeg.vsamp[comp],
image->info.jpeg.table[comp]);
}
}
}
}
break;
/* check for JFIF marker with resolution */
case M_APP0:
{
len = MIN(APP_MAX, length);
if (!PDC_OK_FREAD(image->fp, appstring, len))
{
errcode = PDF_E_IMAGE_CORRUPT;
goto PDF_JPEG_ERROR;
}
length -= len;
/* Check for JFIF application marker and read density values
* per JFIF spec version 1.02.
*/
#define PDF_STRING_JFIF "\x4A\x46\x49\x46"
slen = strlen(PDF_STRING_JFIF);
if (len > slen &&
!strncmp(PDF_STRING_JFIF, (char *) appstring, slen))
{
/* resolution unit and resolution */
unit = appstring[7];
image->dpi_x = (pdc_scalar)
pdc_get_be_ushort(&appstring[8]);
image->dpi_y = (pdc_scalar)
pdc_get_be_ushort(&appstring[10]);
#define JFIF_ASPECT_RATIO 0 /* JFIF unit byte: aspect ratio only */
#define JFIF_DOTS_PER_INCH 1 /* JFIF unit byte: dots per inch */
#define JFIF_DOTS_PER_CM 2 /* JFIF unit byte: dots per cm */
switch (unit)
{
case JFIF_DOTS_PER_INCH:
break;
case JFIF_DOTS_PER_CM:
image->dpi_x *= 100 * PDC_INCH2METER;
image->dpi_y *= 100 * PDC_INCH2METER;
break;
case JFIF_ASPECT_RATIO:
image->dpi_x *= -1;
image->dpi_y *= -1;
break;
/* unknown ==> ignore */
default:
break;
}
if (logg5)
{
pdc_logg(p->pdc, "\t\tJFIF marker found\n");
pdc_logg(p->pdc, "\t\tJFIF density unit: %d", unit);
switch (unit)
{
case JFIF_DOTS_PER_INCH:
pdc_logg(p->pdc, " (inch)\n");
break;
case JFIF_DOTS_PER_CM:
pdc_logg(p->pdc, " (cm)\n");
break;
case JFIF_ASPECT_RATIO:
pdc_logg(p->pdc, " (aspect ratio)\n");
break;
default:
pdc_logg(p->pdc, " (unknown; ignored)\n");
break;
}
pdc_logg(p->pdc, "\t\tJFIF x resolution = %g\n",
image->dpi_x);
pdc_logg(p->pdc, "\t\tJFIF y resolution = %g\n",
image->dpi_y);
}
}
}
break;
/* check for Adobe marker */
case M_APP14:
{
len = MIN(APP_MAX, length);
if (!PDC_OK_FREAD(image->fp, appstring, len))
{
errcode = PDF_E_IMAGE_CORRUPT;
goto PDF_JPEG_ERROR;
}
length -= len;
/*
* Check for Adobe application marker. It is known
* (per Adobe's TN5116)
* to contain the string "Adobe" at the start
* of the APP14 marker.
*/
#define PDF_STRING_Adobe "\x41\x64\x6F\x62\x65"
slen = strlen(PDF_STRING_Adobe);
if (len > slen &&
!strncmp(PDF_STRING_Adobe, (char *) appstring, slen))
{
if (logg5)
{
pdc_byte *val = appstring+slen;
pdc_logg(p->pdc, "\t\tAdobe marker found\n");
if (len >= 12)
{
pdc_logg(p->pdc, "\t\tversion = 0x%02X 0x%02X\n",
(unsigned char) val[0], (unsigned char) val[1]);
pdc_logg(p->pdc, "\t\tflags0 = 0x%02X 0x%02X\n",
(unsigned char) val[2], (unsigned char) val[3]);
pdc_logg(p->pdc, "\t\tflags1 = 0x%02X 0x%02X\n",
(unsigned char) val[4], (unsigned char) val[5]);
pdc_logg(p->pdc, "\t\tcolor transform = 0x%02X\n",
val[6]);
}
}
if (len >= 12)
transform = appstring[slen+6];
/* Keep Adobe marker for transform == 2 (YCCK) */
if (transform == 2)
{
if (logg5)
pdc_logg(p->pdc,
"\t\tYCCK color space: Keep Adobe marker\n");
pdf_register_JPEG_segment(p, image,
adobe_pos, (size_t) (adobe_len + JPEG_MARKER_LEN));
}
}
}
break;
/* check for start of scan marker */
case M_SOS:
{
pdc_byte comps = pdc_fgetc(image->fp);
length -= 1;
if (logg5)
{
pdc_logg(p->pdc, "\t\tNumber of components in scan = "
"%d\n", comps);
}
/*
* If the scan doesn't contain all components it must be
* a multiscan image, which doesn't work in Acrobat.
*/
if (comps < image->components)
{
need_transcode = pdc_true;
if (logg5)
{
pdc_logg(p->pdc,
"\ttranscoding because of multiscan\n");
}
}
markers_done = pdc_true;
}
break;
default:
break;
}
/* jump to the next marker */
if (length > 0)
{
if (pdc_fseek(image->fp, (long) length, SEEK_CUR) == -1)
{
errcode = PDF_E_IMAGE_CORRUPT;
goto PDF_JPEG_ERROR;
}
}
}
/* do some sanity checks with the parameters */
if (image->height <= 0 || image->width <= 0 || image->components <= 0)
{
errcode = PDF_E_IMAGE_CORRUPT;
goto PDF_JPEG_ERROR;
}
if (image->bpc != 8)
{
errint = image->bpc;
errcode = PDF_E_IMAGE_BADDEPTH;
goto PDF_JPEG_ERROR;
}
{
switch (image->components) {
case 1:
/* spot color may have been applied */
if (image->colorspace == pdc_undef)
image->colorspace = DeviceGray;
break;
case 3:
image->colorspace = DeviceRGB;
break;
case 4:
image->colorspace = DeviceCMYK;
break;
default:
errint = image->components;
errcode = PDF_E_IMAGE_BADCOMP;
goto PDF_JPEG_ERROR;
}
}
if (image->imagemask)
{
if (image->components != 1)
{
errcode = PDF_E_IMAGE_BADMASK;
goto PDF_JPEG_ERROR;
}
if (p->compatibility <= PDC_1_3)
{
errcode = PDF_E_IMAGE_MASK1BIT13;
goto PDF_JPEG_ERROR;
}
else
{
/* images with more than one bit will be written as /SMask,
* and don't require an /ImageMask entry.
*/
image->imagemask = pdc_false;
}
}
if (logg5)
{
pdc_logg(p->pdc, "\tColorspace=");
pdf_log_colorspace(p, image->colorspace);
pdc_logg(p->pdc, "\n");
}
/* special handling for CMYK JPEG files */
if (image->components == 4)
{
/* CMYK JPEGs use inverse polarity */
image->invert = !image->invert;
if (logg5)
pdc_logg(p->pdc,
"\tinverting image because of 4 components\n");
/* Adobe and other CMYK JPEGs always require transcoding */
need_transcode = pdc_true;
if (logg5)
pdc_logg(p->pdc,
"\ttranscoding image because of 4 components\n");
}
image->in_use = pdc_true; /* mark slot as used */
if (need_transcode)
{
if (logg5)
{
pdc_logg(p->pdc, "\tcalling libjpeg for transcoding\n");
}
image->src.init = NULL;
image->src.fill = pdf_data_source_JPEG_fill_transcode;
image->src.terminate = NULL;
}
else
{
image->src.init = pdf_data_source_JPEG_init;
image->src.fill = pdf_data_source_JPEG_fill;
image->src.terminate = pdf_data_source_JPEG_terminate;
}
image->src.private_data = (void *) image;
if (image->doinline)
pdf_put_inline_image(p, imageslot);
else
pdf_put_image(p, imageslot, pdc_true, pdc_true);
if (!image->corrupt)
{
pdf_cleanup_jpeg(p, image);
return imageslot;
}
PDF_JPEG_ERROR:
{
const char *stemp = NULL;
if (errcode)
stemp = pdf_get_image_filename(p, image);
switch (errcode)
{
case PDC_E_IO_READ:
case PDF_E_IMAGE_ICC:
case PDF_E_IMAGE_ICC2:
case PDF_E_IMAGE_COLORIZE:
case PDF_E_IMAGE_BADMASK:
case PDF_E_IMAGE_MASK1BIT13:
pdc_set_errmsg(p->pdc, errcode, stemp, 0, 0, 0);
break;
case PDC_E_IO_BADFORMAT:
pdc_set_errmsg(p->pdc, errcode, stemp, "JPEG", 0, 0);
break;
case PDF_E_IMAGE_CORRUPT:
pdc_set_errmsg(p->pdc, errcode, "JPEG", stemp, 0, 0);
break;
case PDF_E_JPEG_COMPRESSION:
case PDF_E_IMAGE_BADDEPTH:
case PDF_E_IMAGE_BADCOMP:
pdc_set_errmsg(p->pdc, errcode,
pdc_errprintf(p->pdc, "%d", errint), stemp, 0, 0);
break;
case 0: /* error code and message already set */
break;
}
}
pdf_cleanup_jpeg(p, image);
return -1;
}
void
pdf_cleanup_jpeg(PDF *p, pdf_image *image)
{
if (image->info.jpeg.virtfile != NULL)
{
(void) pdc__delete_pvf(p->pdc, image->info.jpeg.virtfile);
image->info.jpeg.virtfile = NULL;
}
if (image->info.jpeg.seglist != NULL)
{
pdc_free(p->pdc, image->info.jpeg.seglist);
image->info.jpeg.seglist = NULL;
}
}
#endif /* PDF_JPEG_SUPPORTED */
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