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// This file implements a memory destination for libjpeg
// The design is very similar to jdatadst.c in libjpeg
// These functions are not meant to be used directly, see jpeg_mem.h instead.
// We are filling out stubs required by jpeglib, those stubs are private to
// the implementation, we are just making available JPGMemSrc, JPGMemDest
#include "tensorflow/core/lib/jpeg/jpeg_handle.h"
#include <setjmp.h>
#include <stddef.h>
#include "tensorflow/core/platform/logging.h"
namespace tensorflow {
namespace jpeg {
void CatchError(j_common_ptr cinfo) {
(*cinfo->err->output_message)(cinfo);
jmp_buf *jpeg_jmpbuf = reinterpret_cast<jmp_buf *>(cinfo->client_data);
jpeg_destroy(cinfo);
longjmp(*jpeg_jmpbuf, 1);
}
// *****************************************************************************
// *****************************************************************************
// *****************************************************************************
// Destination functions
// -----------------------------------------------------------------------------
void MemInitDestination(j_compress_ptr cinfo) {
MemDestMgr *dest = reinterpret_cast<MemDestMgr *>(cinfo->dest);
VLOG(1) << "Initializing buffer=" << dest->bufsize << " bytes";
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = dest->bufsize;
dest->datacount = 0;
if (dest->dest) {
dest->dest->clear();
}
}
// -----------------------------------------------------------------------------
boolean MemEmptyOutputBuffer(j_compress_ptr cinfo) {
MemDestMgr *dest = reinterpret_cast<MemDestMgr *>(cinfo->dest);
VLOG(1) << "Writing " << dest->bufsize << " bytes";
if (dest->dest) {
dest->dest->append(reinterpret_cast<char *>(dest->buffer), dest->bufsize);
}
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = dest->bufsize;
return TRUE;
}
// -----------------------------------------------------------------------------
void MemTermDestination(j_compress_ptr cinfo) {
MemDestMgr *dest = reinterpret_cast<MemDestMgr *>(cinfo->dest);
VLOG(1) << "Writing " << dest->bufsize - dest->pub.free_in_buffer << " bytes";
if (dest->dest) {
dest->dest->append(reinterpret_cast<char *>(dest->buffer),
dest->bufsize - dest->pub.free_in_buffer);
VLOG(1) << "Total size= " << dest->dest->size();
}
dest->datacount = dest->bufsize - dest->pub.free_in_buffer;
}
// -----------------------------------------------------------------------------
void SetDest(j_compress_ptr cinfo, void *buffer, int bufsize) {
SetDest(cinfo, buffer, bufsize, NULL);
}
// -----------------------------------------------------------------------------
void SetDest(j_compress_ptr cinfo, void *buffer, int bufsize,
string *destination) {
MemDestMgr *dest;
if (cinfo->dest == NULL) {
cinfo->dest = reinterpret_cast<struct jpeg_destination_mgr *>(
(*cinfo->mem->alloc_small)(reinterpret_cast<j_common_ptr>(cinfo),
JPOOL_PERMANENT, sizeof(MemDestMgr)));
}
dest = reinterpret_cast<MemDestMgr *>(cinfo->dest);
dest->bufsize = bufsize;
dest->buffer = static_cast<JOCTET *>(buffer);
dest->dest = destination;
dest->pub.init_destination = MemInitDestination;
dest->pub.empty_output_buffer = MemEmptyOutputBuffer;
dest->pub.term_destination = MemTermDestination;
}
// *****************************************************************************
// *****************************************************************************
// *****************************************************************************
// Source functions
// -----------------------------------------------------------------------------
void MemInitSource(j_decompress_ptr cinfo) {
MemSourceMgr *src = reinterpret_cast<MemSourceMgr *>(cinfo->src);
src->pub.next_input_byte = src->data;
src->pub.bytes_in_buffer = src->datasize;
}
// -----------------------------------------------------------------------------
// We emulate the same error-handling as fill_input_buffer() from jdatasrc.c,
// for coherency's sake.
boolean MemFillInputBuffer(j_decompress_ptr cinfo) {
static const JOCTET kEOIBuffer[2] = {0xff, JPEG_EOI};
MemSourceMgr *src = reinterpret_cast<MemSourceMgr *>(cinfo->src);
if (src->pub.bytes_in_buffer == 0 && src->pub.next_input_byte == src->data) {
// empty file -> treated as an error.
ERREXIT(cinfo, JERR_INPUT_EMPTY);
return FALSE;
} else if (src->pub.bytes_in_buffer) {
// if there's still some data left, it's probably corrupted
return src->try_recover_truncated_jpeg ? TRUE : FALSE;
} else if (src->pub.next_input_byte != kEOIBuffer &&
src->try_recover_truncated_jpeg) {
// In an attempt to recover truncated files, we insert a fake EOI
WARNMS(cinfo, JWRN_JPEG_EOF);
src->pub.next_input_byte = kEOIBuffer;
src->pub.bytes_in_buffer = 2;
return TRUE;
} else {
// We already inserted a fake EOI and it wasn't enough, so this time
// it's really an error.
ERREXIT(cinfo, JERR_FILE_READ);
return FALSE;
}
}
// -----------------------------------------------------------------------------
void MemTermSource(j_decompress_ptr cinfo) {}
// -----------------------------------------------------------------------------
void MemSkipInputData(j_decompress_ptr cinfo, long jump) {
MemSourceMgr *src = reinterpret_cast<MemSourceMgr *>(cinfo->src);
src->pub.bytes_in_buffer -= jump;
src->pub.next_input_byte += jump;
}
// -----------------------------------------------------------------------------
void SetSrc(j_decompress_ptr cinfo, const void *data,
unsigned long int datasize, bool try_recover_truncated_jpeg) {
MemSourceMgr *src;
cinfo->src = reinterpret_cast<struct jpeg_source_mgr *>(
(*cinfo->mem->alloc_small)(reinterpret_cast<j_common_ptr>(cinfo),
JPOOL_PERMANENT, sizeof(MemSourceMgr)));
src = reinterpret_cast<MemSourceMgr *>(cinfo->src);
src->pub.init_source = MemInitSource;
src->pub.fill_input_buffer = MemFillInputBuffer;
src->pub.skip_input_data = MemSkipInputData;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = MemTermSource;
src->data = reinterpret_cast<const unsigned char *>(data);
src->datasize = datasize;
src->pub.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
src->try_recover_truncated_jpeg = try_recover_truncated_jpeg;
}
} // namespace jpeg
} // namespace tensorflow
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