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// Copyright 2020 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcodec/jpeg/jpeg_progressive_decoder.h"
#include <utility>
#include "core/fxcodec/cfx_codec_memory.h"
#include "core/fxcodec/fx_codec.h"
#include "core/fxcodec/jpeg/jpeg_common.h"
#include "core/fxcodec/scanlinedecoder.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxge/dib/cfx_dibbase.h"
#include "core/fxge/dib/fx_dib.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "third_party/base/check.h"
#include "third_party/base/ptr_util.h"
class CJpegContext final : public ProgressiveDecoderIface::Context {
public:
CJpegContext();
~CJpegContext() override;
jmp_buf& GetJumpMark() { return m_JumpMark; }
jmp_buf m_JumpMark;
jpeg_decompress_struct m_Info = {};
jpeg_error_mgr m_ErrMgr = {};
jpeg_source_mgr m_SrcMgr = {};
unsigned int m_SkipSize = 0;
};
extern "C" {
static void error_fatal(j_common_ptr cinfo) {
auto* pContext = reinterpret_cast<CJpegContext*>(cinfo->client_data);
longjmp(pContext->m_JumpMark, -1);
}
static void src_skip_data(jpeg_decompress_struct* cinfo, long num) {
if (cinfo->src->bytes_in_buffer < static_cast<size_t>(num)) {
auto* pContext = reinterpret_cast<CJpegContext*>(cinfo->client_data);
pContext->m_SkipSize = (unsigned int)(num - cinfo->src->bytes_in_buffer);
cinfo->src->bytes_in_buffer = 0;
} else {
cinfo->src->next_input_byte += num;
cinfo->src->bytes_in_buffer -= num;
}
}
} // extern "C"
static void JpegLoadAttribute(const jpeg_decompress_struct& info,
CFX_DIBAttribute* pAttribute) {
pAttribute->m_nXDPI = info.X_density;
pAttribute->m_nYDPI = info.Y_density;
pAttribute->m_wDPIUnit =
static_cast<CFX_DIBAttribute::ResUnit>(info.density_unit);
}
CJpegContext::CJpegContext() {
m_Info.client_data = this;
m_Info.err = &m_ErrMgr;
m_ErrMgr.error_exit = error_fatal;
m_ErrMgr.emit_message = error_do_nothing_int;
m_ErrMgr.output_message = error_do_nothing;
m_ErrMgr.format_message = error_do_nothing_char;
m_ErrMgr.reset_error_mgr = error_do_nothing;
m_SrcMgr.init_source = src_do_nothing;
m_SrcMgr.term_source = src_do_nothing;
m_SrcMgr.skip_input_data = src_skip_data;
m_SrcMgr.fill_input_buffer = src_fill_buffer;
m_SrcMgr.resync_to_restart = src_resync;
}
CJpegContext::~CJpegContext() {
jpeg_destroy_decompress(&m_Info);
}
namespace fxcodec {
// static
JpegProgressiveDecoder* JpegProgressiveDecoder::GetInstance() {
static pdfium::base::NoDestructor<JpegProgressiveDecoder> s;
return s.get();
}
// static
std::unique_ptr<ProgressiveDecoderIface::Context>
JpegProgressiveDecoder::Start() {
// Use ordinary pointer until past the possibility of a longjump.
auto* pContext = new CJpegContext();
if (setjmp(pContext->m_JumpMark) == -1) {
delete pContext;
return nullptr;
}
jpeg_create_decompress(&pContext->m_Info);
pContext->m_Info.src = &pContext->m_SrcMgr;
pContext->m_SkipSize = 0;
return pdfium::WrapUnique(pContext);
}
// static
jmp_buf& JpegProgressiveDecoder::GetJumpMark(Context* pContext) {
return static_cast<CJpegContext*>(pContext)->GetJumpMark();
}
// static
int JpegProgressiveDecoder::ReadHeader(Context* pContext,
int* width,
int* height,
int* nComps,
CFX_DIBAttribute* pAttribute) {
DCHECK(pAttribute);
auto* ctx = static_cast<CJpegContext*>(pContext);
int ret = jpeg_read_header(&ctx->m_Info, TRUE);
if (ret == JPEG_SUSPENDED)
return 2;
if (ret != JPEG_HEADER_OK)
return 1;
*width = ctx->m_Info.image_width;
*height = ctx->m_Info.image_height;
*nComps = ctx->m_Info.num_components;
JpegLoadAttribute(ctx->m_Info, pAttribute);
return 0;
}
// static
bool JpegProgressiveDecoder::StartScanline(Context* pContext, int down_scale) {
auto* ctx = static_cast<CJpegContext*>(pContext);
ctx->m_Info.scale_denom = static_cast<unsigned int>(down_scale);
return !!jpeg_start_decompress(&ctx->m_Info);
}
// static
bool JpegProgressiveDecoder::ReadScanline(Context* pContext,
unsigned char* dest_buf) {
auto* ctx = static_cast<CJpegContext*>(pContext);
unsigned int nlines = jpeg_read_scanlines(&ctx->m_Info, &dest_buf, 1);
return nlines == 1;
}
FX_FILESIZE JpegProgressiveDecoder::GetAvailInput(Context* pContext) const {
auto* ctx = static_cast<CJpegContext*>(pContext);
return static_cast<FX_FILESIZE>(ctx->m_SrcMgr.bytes_in_buffer);
}
bool JpegProgressiveDecoder::Input(Context* pContext,
RetainPtr<CFX_CodecMemory> codec_memory) {
pdfium::span<uint8_t> src_buf = codec_memory->GetUnconsumedSpan();
auto* ctx = static_cast<CJpegContext*>(pContext);
if (ctx->m_SkipSize) {
if (ctx->m_SkipSize > src_buf.size()) {
ctx->m_SrcMgr.bytes_in_buffer = 0;
ctx->m_SkipSize -= src_buf.size();
return true;
}
src_buf = src_buf.subspan(ctx->m_SkipSize);
ctx->m_SkipSize = 0;
}
ctx->m_SrcMgr.next_input_byte = src_buf.data();
ctx->m_SrcMgr.bytes_in_buffer = src_buf.size();
return true;
}
JpegProgressiveDecoder::JpegProgressiveDecoder() = default;
JpegProgressiveDecoder::~JpegProgressiveDecoder() = default;
} // namespace fxcodec
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