| // 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 <optional> |
| #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/check.h" |
| #include "core/fxcrt/compiler_specific.h" |
| #include "core/fxcrt/fx_safe_types.h" |
| #include "core/fxcrt/ptr_util.h" |
| #include "core/fxge/dib/cfx_dibbase.h" |
| #include "core/fxge/dib/fx_dib.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 { |
| // SAFETY: required from library during callback. |
| UNSAFE_BUFFERS(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 { |
| |
| namespace { |
| |
| JpegProgressiveDecoder* g_jpeg_decoder = nullptr; |
| |
| } // namespace |
| |
| // static |
| void JpegProgressiveDecoder::InitializeGlobals() { |
| CHECK(!g_jpeg_decoder); |
| g_jpeg_decoder = new JpegProgressiveDecoder(); |
| } |
| |
| // static |
| void JpegProgressiveDecoder::DestroyGlobals() { |
| delete g_jpeg_decoder; |
| g_jpeg_decoder = nullptr; |
| } |
| |
| // static |
| JpegProgressiveDecoder* JpegProgressiveDecoder::GetInstance() { |
| return g_jpeg_decoder; |
| } |
| |
| // 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) { |
| auto* ctx = static_cast<CJpegContext*>(pContext); |
| ctx->m_Info.scale_denom = 1; |
| 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 |