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//========================================================================
//
// DCTStream.cc
//
// This file is licensed under the GPLv2 or later
//
// Copyright 2005 Jeff Muizelaar <jeff@infidigm.net>
// Copyright 2005-2010 Albert Astals Cid <aacid@kde.org>
// Copyright 2009 Ryszard Trojnacki <rysiek@menel.com>
//
//========================================================================
#include "DCTStream.h"
static void str_init_source(j_decompress_ptr cinfo)
{
}
static boolean str_fill_input_buffer(j_decompress_ptr cinfo)
{
int c;
struct str_src_mgr * src = (struct str_src_mgr *)cinfo->src;
if (src->index == 0) {
c = 0xFF;
src->index++;
}
else if (src->index == 1) {
c = 0xD8;
src->index++;
}
else c = src->str->getChar();
if (c != EOF)
{
src->buffer = c;
src->pub.next_input_byte = &src->buffer;
src->pub.bytes_in_buffer = 1;
return TRUE;
}
else return FALSE;
}
static void str_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
struct str_src_mgr * src = (struct str_src_mgr *)cinfo->src;
if (num_bytes > 0) {
while (num_bytes > (long) src->pub.bytes_in_buffer) {
num_bytes -= (long) src->pub.bytes_in_buffer;
str_fill_input_buffer(cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
static void str_term_source(j_decompress_ptr cinfo)
{
}
DCTStream::DCTStream(Stream *strA, int colorXformA) :
FilterStream(strA) {
init();
}
DCTStream::~DCTStream() {
jpeg_destroy_decompress(&cinfo);
delete str;
}
static void exitErrorHandler(jpeg_common_struct *error) {
j_decompress_ptr cinfo = (j_decompress_ptr)error;
str_src_mgr * src = (struct str_src_mgr *)cinfo->src;
longjmp(src->setjmp_buffer, 1);
}
void DCTStream::init()
{
jpeg_std_error(&jerr);
jerr.error_exit = &exitErrorHandler;
src.pub.init_source = str_init_source;
src.pub.fill_input_buffer = str_fill_input_buffer;
src.pub.skip_input_data = str_skip_input_data;
src.pub.resync_to_restart = jpeg_resync_to_restart;
src.pub.term_source = str_term_source;
src.pub.bytes_in_buffer = 0;
src.pub.next_input_byte = NULL;
src.str = str;
src.index = 0;
current = NULL;
limit = NULL;
cinfo.err = &jerr;
jpeg_create_decompress(&cinfo);
cinfo.src = (jpeg_source_mgr *)&src;
row_buffer = NULL;
}
void DCTStream::reset() {
int row_stride;
str->reset();
if (row_buffer)
{
jpeg_destroy_decompress(&cinfo);
init();
}
// JPEG data has to start with 0xFF 0xD8
// but some pdf like the one on
// https://bugs.freedesktop.org/show_bug.cgi?id=3299
// does have some garbage before that this seeks for
// the start marker...
bool startFound = false;
int c = 0, c2 = 0;
while (!startFound)
{
if (!c)
{
c = str->getChar();
if (c == -1)
{
error(-1, "Could not find start of jpeg data");
return;
}
if (c != 0xFF) c = 0;
}
else
{
c2 = str->getChar();
if (c2 != 0xD8)
{
c = 0;
c2 = 0;
}
else startFound = true;
}
}
if (!setjmp(src.setjmp_buffer)) {
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
row_stride = cinfo.output_width * cinfo.output_components;
row_buffer = cinfo.mem->alloc_sarray((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
}
}
int DCTStream::getChar() {
int c;
if (current == limit) {
if (cinfo.output_scanline < cinfo.output_height)
{
if (!setjmp(src.setjmp_buffer))
{
if (!jpeg_read_scanlines(&cinfo, row_buffer, 1)) return EOF;
current = &row_buffer[0][0];
limit = &row_buffer[0][(cinfo.output_width - 1) * cinfo.output_components] + cinfo.output_components;
}
else return EOF;
}
else return EOF;
}
c = *current;
++current;
return c;
}
int DCTStream::lookChar() {
return *current;
}
GooString *DCTStream::getPSFilter(int psLevel, char *indent) {
GooString *s;
if (psLevel < 2) {
return NULL;
}
if (!(s = str->getPSFilter(psLevel, indent))) {
return NULL;
}
s->append(indent)->append("<< >> /DCTDecode filter\n");
return s;
}
GBool DCTStream::isBinary(GBool last) {
return str->isBinary(gTrue);
}
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