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qpdf/libqpdf/Pl_DCT.cc
Thorsten Schöning 2c704b99a1 Undefined functions because of missing std:: or header. (#295)
* [bcc32 Error] QPDF.cc(375): E2268 Call to undefined function 'atof'
  Full parser context
    QPDF.cc(358): parsing: void QPDF::parse(const char *)

* [bcc32 Error] QPDFTokenizer.cc(183): E2268 Call to undefined function 'strtol'
  Full parser context
    QPDFTokenizer.cc(163): parsing: void QPDFTokenizer::resolveLiteral()

* [bcc32 Error] pdf-split-pages.cc(52): E2268 Call to undefined function 'exit'
  Full parser context
    pdf-split-pages.cc(50): parsing: void usage()

* PR #295: Including "cstdlib" should be replaced with "stdlib.h" to be more consistent. At the same time I changed the order of the surrounding includes to reflect alphabetical order, because at some files this already have been the case.
2019-03-12 10:05:29 -04:00

343 lines
9.7 KiB
C++

#include <qpdf/Pl_DCT.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/QTC.hh>
#include <setjmp.h>
#include <stdexcept>
#include <stdlib.h>
#include <string>
#if BITS_IN_JSAMPLE != 8
# error "qpdf does not support libjpeg built with BITS_IN_JSAMPLE != 8"
#endif
struct qpdf_jpeg_error_mgr
{
struct jpeg_error_mgr pub;
jmp_buf jmpbuf;
std::string msg;
};
static void
error_handler(j_common_ptr cinfo)
{
qpdf_jpeg_error_mgr* jerr =
reinterpret_cast<qpdf_jpeg_error_mgr*>(cinfo->err);
char buf[JMSG_LENGTH_MAX];
(*cinfo->err->format_message)(cinfo, buf);
jerr->msg = buf;
longjmp(jerr->jmpbuf, 1);
}
Pl_DCT::Pl_DCT(char const* identifier, Pipeline* next) :
Pipeline(identifier, next),
action(a_decompress),
buf("DCT compressed image")
{
}
Pl_DCT::Pl_DCT(char const* identifier, Pipeline* next,
JDIMENSION image_width,
JDIMENSION image_height,
int components,
J_COLOR_SPACE color_space,
CompressConfig* config_callback) :
Pipeline(identifier, next),
action(a_compress),
buf("DCT uncompressed image"),
image_width(image_width),
image_height(image_height),
components(components),
color_space(color_space),
config_callback(config_callback)
{
}
Pl_DCT::~Pl_DCT()
{
}
void
Pl_DCT::write(unsigned char* data, size_t len)
{
this->buf.write(data, len);
}
void
Pl_DCT::finish()
{
this->buf.finish();
// Using a PointerHolder<Buffer> here and passing it into compress
// and decompress causes a memory leak with setjmp/longjmp. Just
// use a pointer and delete it.
Buffer* b = this->buf.getBuffer();
if (b->getSize() == 0)
{
// Special case: empty data will never succeed and probably
// means we're calling finish a second time from an exception
// handler.
delete b;
this->getNext()->finish();
return;
}
struct jpeg_compress_struct cinfo_compress;
struct jpeg_decompress_struct cinfo_decompress;
struct qpdf_jpeg_error_mgr jerr;
cinfo_compress.err = jpeg_std_error(&(jerr.pub));
cinfo_decompress.err = jpeg_std_error(&(jerr.pub));
jerr.pub.error_exit = error_handler;
bool error = false;
// The jpeg library is a "C" library, so we use setjmp and longjmp
// for exception handling.
if (setjmp(jerr.jmpbuf) == 0)
{
try
{
if (this->action == a_compress)
{
compress(reinterpret_cast<void*>(&cinfo_compress), b);
}
else
{
decompress(reinterpret_cast<void*>(&cinfo_decompress), b);
}
}
catch (std::exception& e)
{
// Convert an exception back to a longjmp so we can ensure
// that the right cleanup happens. This will get converted
// back to an exception.
jerr.msg = e.what();
longjmp(jerr.jmpbuf, 1);
}
}
else
{
error = true;
}
delete b;
if (this->action == a_compress)
{
jpeg_destroy_compress(&cinfo_compress);
}
if (this->action == a_decompress)
{
jpeg_destroy_decompress(&cinfo_decompress);
}
if (error)
{
throw std::runtime_error(jerr.msg);
}
}
struct dct_pipeline_dest
{
struct jpeg_destination_mgr pub; /* public fields */
unsigned char* buffer;
size_t size;
Pipeline* next;
};
static void
init_pipeline_destination(j_compress_ptr)
{
}
static boolean
empty_pipeline_output_buffer(j_compress_ptr cinfo)
{
QTC::TC("libtests", "Pl_DCT empty_pipeline_output_buffer");
dct_pipeline_dest* dest =
reinterpret_cast<dct_pipeline_dest*>(cinfo->dest);
dest->next->write(dest->buffer, dest->size);
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = dest->size;
return TRUE;
}
static void
term_pipeline_destination(j_compress_ptr cinfo)
{
QTC::TC("libtests", "Pl_DCT term_pipeline_destination");
dct_pipeline_dest* dest =
reinterpret_cast<dct_pipeline_dest*>(cinfo->dest);
dest->next->write(dest->buffer, dest->size - dest->pub.free_in_buffer);
}
static void
jpeg_pipeline_dest(j_compress_ptr cinfo,
unsigned char* outbuffer, size_t size,
Pipeline* next)
{
cinfo->dest = static_cast<struct jpeg_destination_mgr *>(
(*cinfo->mem->alloc_small)(reinterpret_cast<j_common_ptr>(cinfo),
JPOOL_PERMANENT,
sizeof(dct_pipeline_dest)));
dct_pipeline_dest* dest =
reinterpret_cast<dct_pipeline_dest*>(cinfo->dest);
dest->pub.init_destination = init_pipeline_destination;
dest->pub.empty_output_buffer = empty_pipeline_output_buffer;
dest->pub.term_destination = term_pipeline_destination;
dest->pub.next_output_byte = dest->buffer = outbuffer;
dest->pub.free_in_buffer = dest->size = size;
dest->next = next;
}
static void
init_buffer_source(j_decompress_ptr)
{
}
static boolean
fill_buffer_input_buffer(j_decompress_ptr)
{
// The whole JPEG data is expected to reside in the supplied memory
// buffer, so any request for more data beyond the given buffer size
// is treated as an error.
throw std::runtime_error("invalid jpeg data reading from buffer");
return TRUE;
}
static void
skip_buffer_input_data(j_decompress_ptr cinfo, long num_bytes)
{
if (num_bytes < 0)
{
throw std::runtime_error(
"reading jpeg: jpeg library requested"
" skipping a negative number of bytes");
}
size_t to_skip = static_cast<size_t>(num_bytes);
if ((to_skip > 0) && (to_skip <= cinfo->src->bytes_in_buffer))
{
cinfo->src->next_input_byte += to_skip;
cinfo->src->bytes_in_buffer -= to_skip;
}
else if (to_skip != 0)
{
cinfo->src->next_input_byte += cinfo->src->bytes_in_buffer;
cinfo->src->bytes_in_buffer = 0;
}
}
static void
term_buffer_source(j_decompress_ptr)
{
}
static void
jpeg_buffer_src(j_decompress_ptr cinfo, Buffer* buffer)
{
cinfo->src = reinterpret_cast<jpeg_source_mgr *>(
(*cinfo->mem->alloc_small)(reinterpret_cast<j_common_ptr>(cinfo),
JPOOL_PERMANENT,
sizeof(jpeg_source_mgr)));
jpeg_source_mgr* src = cinfo->src;
src->init_source = init_buffer_source;
src->fill_input_buffer = fill_buffer_input_buffer;
src->skip_input_data = skip_buffer_input_data;
src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->term_source = term_buffer_source;
src->bytes_in_buffer = buffer->getSize();
src->next_input_byte = buffer->getBuffer();
}
void
Pl_DCT::compress(void* cinfo_p, Buffer* b)
{
struct jpeg_compress_struct* cinfo =
reinterpret_cast<jpeg_compress_struct*>(cinfo_p);
#if ((defined(__GNUC__) && ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406) || \
defined(__clang__))
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wold-style-cast"
#endif
jpeg_create_compress(cinfo);
#if ((defined(__GNUC__) && ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406) || \
defined(__clang__))
# pragma GCC diagnostic pop
#endif
static int const BUF_SIZE = 65536;
PointerHolder<unsigned char> outbuffer_ph(
true, new unsigned char[BUF_SIZE]);
unsigned char* outbuffer = outbuffer_ph.getPointer();
jpeg_pipeline_dest(cinfo, outbuffer, BUF_SIZE, this->getNext());
cinfo->image_width = this->image_width;
cinfo->image_height = this->image_height;
cinfo->input_components = this->components;
cinfo->in_color_space = this->color_space;
jpeg_set_defaults(cinfo);
if (this->config_callback)
{
this->config_callback->apply(cinfo);
}
jpeg_start_compress(cinfo, TRUE);
int width = cinfo->image_width * cinfo->input_components;
size_t expected_size =
cinfo->image_height * cinfo->image_width * cinfo->input_components;
if (b->getSize() != expected_size)
{
throw std::runtime_error(
"Pl_DCT: image buffer size = " +
QUtil::int_to_string(b->getSize()) + "; expected size = " +
QUtil::int_to_string(expected_size));
}
JSAMPROW row_pointer[1];
unsigned char* buffer = b->getBuffer();
while (cinfo->next_scanline < cinfo->image_height)
{
// We already verified that the buffer is big enough.
row_pointer[0] = &buffer[cinfo->next_scanline * width];
(void) jpeg_write_scanlines(cinfo, row_pointer, 1);
}
jpeg_finish_compress(cinfo);
this->getNext()->finish();
}
void
Pl_DCT::decompress(void* cinfo_p, Buffer* b)
{
struct jpeg_decompress_struct* cinfo =
reinterpret_cast<jpeg_decompress_struct*>(cinfo_p);
#if ((defined(__GNUC__) && ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406) || \
defined(__clang__))
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wold-style-cast"
#endif
jpeg_create_decompress(cinfo);
#if ((defined(__GNUC__) && ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406) || \
defined(__clang__))
# pragma GCC diagnostic pop
#endif
jpeg_buffer_src(cinfo, b);
(void) jpeg_read_header(cinfo, TRUE);
(void) jpeg_calc_output_dimensions(cinfo);
int width = cinfo->output_width * cinfo->output_components;
JSAMPARRAY buffer = (*cinfo->mem->alloc_sarray)
(reinterpret_cast<j_common_ptr>(cinfo), JPOOL_IMAGE, width, 1);
(void) jpeg_start_decompress(cinfo);
while (cinfo->output_scanline < cinfo->output_height)
{
(void) jpeg_read_scanlines(cinfo, buffer, 1);
this->getNext()->write(reinterpret_cast<unsigned char*>(buffer[0]),
width * sizeof(buffer[0][0]));
}
(void) jpeg_finish_decompress(cinfo);
this->getNext()->finish();
}