diff options
Diffstat (limited to 'core/fxcodec/lgif/cgifcontext.cpp')
| -rw-r--r-- | core/fxcodec/lgif/cgifcontext.cpp | 549 |
1 files changed, 0 insertions, 549 deletions
diff --git a/core/fxcodec/lgif/cgifcontext.cpp b/core/fxcodec/lgif/cgifcontext.cpp deleted file mode 100644 index af1895316f..0000000000 --- a/core/fxcodec/lgif/cgifcontext.cpp +++ /dev/null @@ -1,549 +0,0 @@ -// Copyright 2017 PDFium Authors. All rights reserved. -// 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/lgif/cgifcontext.h" - -#include <algorithm> -#include <utility> - -#include "core/fxcodec/codec/ccodec_gifmodule.h" -#include "core/fxcodec/lbmp/fx_bmp.h" -#include "core/fxcodec/lgif/fx_gif.h" -#include "third_party/base/ptr_util.h" -#include "third_party/base/stl_util.h" - -namespace { - -const int32_t s_gif_interlace_step[4] = {8, 8, 4, 2}; - -} // namespace - -CGifContext::CGifContext(CCodec_GifModule* gif_module, - CCodec_GifModule::Delegate* pDelegate) - : m_pModule(gif_module), - m_pDelegate(pDelegate), - global_pal_exp(0), - img_row_offset(0), - img_row_avail_size(0), - avail_in(0), - decode_status(GIF_D_STATUS_SIG), - skip_size(0), - next_in(nullptr), - width(0), - height(0), - bc_index(0), - pixel_aspect(0), - global_sort_flag(0), - global_color_resolution(0), - img_pass_num(0) { -} - -CGifContext::~CGifContext() {} - -void CGifContext::RecordCurrentPosition(uint32_t* cur_pos_ptr) { - m_pDelegate->GifRecordCurrentPosition(*cur_pos_ptr); -} - -void CGifContext::ReadScanline(int32_t row_num, uint8_t* row_buf) { - m_pDelegate->GifReadScanline(row_num, row_buf); -} - -bool CGifContext::GetRecordPosition(uint32_t cur_pos, - int32_t left, - int32_t top, - int32_t width, - int32_t height, - int32_t pal_num, - GifPalette* pal_ptr, - int32_t delay_time, - bool user_input, - int32_t trans_index, - int32_t disposal_method, - bool interlace) { - return m_pDelegate->GifInputRecordPositionBuf( - cur_pos, FX_RECT(left, top, left + width, top + height), pal_num, pal_ptr, - delay_time, user_input, trans_index, disposal_method, interlace); -} - -GifDecodeStatus CGifContext::ReadHeader() { - uint32_t skip_size_org = skip_size; - GifHeader* gif_header_ptr = nullptr; - if (!ReadData(reinterpret_cast<uint8_t**>(&gif_header_ptr), 6)) - return GifDecodeStatus::Unfinished; - - if (strncmp(gif_header_ptr->signature, GIF_SIGNATURE, 3) != 0 || - gif_header_ptr->version[0] != '8' || gif_header_ptr->version[2] != 'a') - return GifDecodeStatus::Error; - - GifLocalScreenDescriptor* gif_lsd_ptr = nullptr; - if (!ReadData(reinterpret_cast<uint8_t**>(&gif_lsd_ptr), 7)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - if (gif_lsd_ptr->global_flags.global_pal) { - global_pal_exp = gif_lsd_ptr->global_flags.pal_bits; - uint32_t global_pal_size = unsigned(2 << global_pal_exp) * 3u; - uint8_t* global_pal_ptr = nullptr; - if (!ReadData(&global_pal_ptr, global_pal_size)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - global_sort_flag = gif_lsd_ptr->global_flags.sort_flag; - global_color_resolution = gif_lsd_ptr->global_flags.color_resolution; - m_GlobalPalette.resize(global_pal_size / 3); - memcpy(m_GlobalPalette.data(), global_pal_ptr, global_pal_size); - } - - width = static_cast<int>( - GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_lsd_ptr->width))); - height = static_cast<int>( - GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_lsd_ptr->height))); - bc_index = gif_lsd_ptr->bc_index; - pixel_aspect = gif_lsd_ptr->pixel_aspect; - return GifDecodeStatus::Success; -} - -GifDecodeStatus CGifContext::GetFrame() { - GifDecodeStatus ret = GifDecodeStatus::Success; - while (true) { - switch (decode_status) { - case GIF_D_STATUS_TAIL: - return GifDecodeStatus::Success; - case GIF_D_STATUS_SIG: { - uint8_t* sig_ptr = nullptr; - if (!ReadData(&sig_ptr, 1)) - return GifDecodeStatus::Unfinished; - - switch (*sig_ptr) { - case GIF_SIG_EXTENSION: - SaveDecodingStatus(GIF_D_STATUS_EXT); - continue; - case GIF_SIG_IMAGE: - SaveDecodingStatus(GIF_D_STATUS_IMG_INFO); - continue; - case GIF_SIG_TRAILER: - SaveDecodingStatus(GIF_D_STATUS_TAIL); - return GifDecodeStatus::Success; - default: - if (avail_in) { - // The Gif File has non_standard Tag! - SaveDecodingStatus(GIF_D_STATUS_SIG); - continue; - } - // The Gif File Doesn't have Trailer Tag! - return GifDecodeStatus::Success; - } - } - case GIF_D_STATUS_EXT: { - uint8_t* ext_ptr = nullptr; - if (!ReadData(&ext_ptr, 1)) - return GifDecodeStatus::Unfinished; - - switch (*ext_ptr) { - case GIF_BLOCK_CE: - SaveDecodingStatus(GIF_D_STATUS_EXT_CE); - continue; - case GIF_BLOCK_GCE: - SaveDecodingStatus(GIF_D_STATUS_EXT_GCE); - continue; - case GIF_BLOCK_PTE: - SaveDecodingStatus(GIF_D_STATUS_EXT_PTE); - continue; - default: { - int32_t status = GIF_D_STATUS_EXT_UNE; - if (*ext_ptr == GIF_BLOCK_PTE) { - status = GIF_D_STATUS_EXT_PTE; - } - SaveDecodingStatus(status); - continue; - } - } - } - case GIF_D_STATUS_IMG_INFO: { - ret = DecodeImageInfo(); - if (ret != GifDecodeStatus::Success) - return ret; - - continue; - } - case GIF_D_STATUS_IMG_DATA: { - uint8_t* data_size_ptr = nullptr; - uint8_t* data_ptr = nullptr; - uint32_t skip_size_org = skip_size; - if (!ReadData(&data_size_ptr, 1)) - return GifDecodeStatus::Unfinished; - - while (*data_size_ptr != GIF_BLOCK_TERMINAL) { - if (!ReadData(&data_ptr, *data_size_ptr)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - SaveDecodingStatus(GIF_D_STATUS_IMG_DATA); - skip_size_org = skip_size; - if (!ReadData(&data_size_ptr, 1)) - return GifDecodeStatus::Unfinished; - } - SaveDecodingStatus(GIF_D_STATUS_SIG); - continue; - } - default: { - ret = DecodeExtension(); - if (ret != GifDecodeStatus::Success) - return ret; - break; - } - } - } - return GifDecodeStatus::Success; -} - -GifDecodeStatus CGifContext::LoadFrame(int32_t frame_num) { - if (!pdfium::IndexInBounds(m_Images, frame_num)) - return GifDecodeStatus::Error; - - uint8_t* data_size_ptr = nullptr; - uint8_t* data_ptr = nullptr; - uint32_t skip_size_org = skip_size; - GifImage* gif_image_ptr = m_Images[frame_num].get(); - uint32_t gif_img_row_bytes = gif_image_ptr->m_ImageInfo.width; - if (gif_img_row_bytes == 0) - return GifDecodeStatus::Error; - - if (decode_status == GIF_D_STATUS_TAIL) { - gif_image_ptr->m_ImageRowBuf.resize(gif_img_row_bytes); - GifGraphicControlExtension* gif_img_gce_ptr = - gif_image_ptr->m_ImageGCE.get(); - int32_t loc_pal_num = - gif_image_ptr->m_ImageInfo.local_flags.local_pal - ? (2 << gif_image_ptr->m_ImageInfo.local_flags.pal_bits) - : 0; - avail_in = 0; - GifPalette* pLocalPalette = gif_image_ptr->m_LocalPalettes.empty() - ? nullptr - : gif_image_ptr->m_LocalPalettes.data(); - if (!gif_img_gce_ptr) { - bool bRes = GetRecordPosition( - gif_image_ptr->image_data_pos, gif_image_ptr->m_ImageInfo.left, - gif_image_ptr->m_ImageInfo.top, gif_image_ptr->m_ImageInfo.width, - gif_image_ptr->m_ImageInfo.height, loc_pal_num, pLocalPalette, 0, 0, - -1, 0, gif_image_ptr->m_ImageInfo.local_flags.interlace); - if (!bRes) { - gif_image_ptr->m_ImageRowBuf.clear(); - return GifDecodeStatus::Error; - } - } else { - bool bRes = GetRecordPosition( - gif_image_ptr->image_data_pos, gif_image_ptr->m_ImageInfo.left, - gif_image_ptr->m_ImageInfo.top, gif_image_ptr->m_ImageInfo.width, - gif_image_ptr->m_ImageInfo.height, loc_pal_num, pLocalPalette, - static_cast<int32_t>(gif_image_ptr->m_ImageGCE->delay_time), - gif_image_ptr->m_ImageGCE->gce_flags.user_input, - gif_image_ptr->m_ImageGCE->gce_flags.transparency - ? static_cast<int32_t>(gif_image_ptr->m_ImageGCE->trans_index) - : -1, - static_cast<int32_t>( - gif_image_ptr->m_ImageGCE->gce_flags.disposal_method), - gif_image_ptr->m_ImageInfo.local_flags.interlace); - if (!bRes) { - gif_image_ptr->m_ImageRowBuf.clear(); - return GifDecodeStatus::Error; - } - } - - if (gif_image_ptr->image_code_exp > GIF_MAX_LZW_EXP) { - gif_image_ptr->m_ImageRowBuf.clear(); - return GifDecodeStatus::Error; - } - - img_row_offset = 0; - img_row_avail_size = 0; - img_pass_num = 0; - gif_image_ptr->image_row_num = 0; - SaveDecodingStatus(GIF_D_STATUS_IMG_DATA); - } - - if (decode_status == GIF_D_STATUS_IMG_DATA) { - if (!ReadData(&data_size_ptr, 1)) - return GifDecodeStatus::Unfinished; - - if (*data_size_ptr != GIF_BLOCK_TERMINAL) { - if (!ReadData(&data_ptr, *data_size_ptr)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - if (!m_ImgDecoder.get()) - m_ImgDecoder = - CFX_LZWDecoder::Create(!gif_image_ptr->m_LocalPalettes.empty() - ? gif_image_ptr->local_pallette_exp - : global_pal_exp, - gif_image_ptr->image_code_exp); - SaveDecodingStatus(GIF_D_STATUS_IMG_DATA); - img_row_offset += img_row_avail_size; - img_row_avail_size = gif_img_row_bytes - img_row_offset; - GifDecodeStatus ret = - m_ImgDecoder.get() - ? m_ImgDecoder->Decode( - data_ptr, *data_size_ptr, - gif_image_ptr->m_ImageRowBuf.data() + img_row_offset, - &img_row_avail_size) - : GifDecodeStatus::Error; - if (ret == GifDecodeStatus::Error) { - DecodingFailureAtTailCleanup(gif_image_ptr); - return GifDecodeStatus::Error; - } - while (ret != GifDecodeStatus::Error) { - if (ret == GifDecodeStatus::Success) { - ReadScanline(gif_image_ptr->image_row_num, - gif_image_ptr->m_ImageRowBuf.data()); - gif_image_ptr->m_ImageRowBuf.clear(); - SaveDecodingStatus(GIF_D_STATUS_TAIL); - return GifDecodeStatus::Success; - } - if (ret == GifDecodeStatus::Unfinished) { - skip_size_org = skip_size; - if (!ReadData(&data_size_ptr, 1)) - return GifDecodeStatus::Unfinished; - - if (*data_size_ptr != GIF_BLOCK_TERMINAL) { - if (!ReadData(&data_ptr, *data_size_ptr)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - if (!m_ImgDecoder.get()) - m_ImgDecoder = - CFX_LZWDecoder::Create(!gif_image_ptr->m_LocalPalettes.empty() - ? gif_image_ptr->local_pallette_exp - : global_pal_exp, - gif_image_ptr->image_code_exp); - SaveDecodingStatus(GIF_D_STATUS_IMG_DATA); - img_row_offset += img_row_avail_size; - img_row_avail_size = gif_img_row_bytes - img_row_offset; - ret = - m_ImgDecoder.get() - ? m_ImgDecoder->Decode( - data_ptr, *data_size_ptr, - gif_image_ptr->m_ImageRowBuf.data() + img_row_offset, - &img_row_avail_size) - : GifDecodeStatus::Error; - } - } - if (ret == GifDecodeStatus::InsufficientDestSize) { - if (gif_image_ptr->m_ImageInfo.local_flags.interlace) { - ReadScanline(gif_image_ptr->image_row_num, - gif_image_ptr->m_ImageRowBuf.data()); - gif_image_ptr->image_row_num += s_gif_interlace_step[img_pass_num]; - if (gif_image_ptr->image_row_num >= - static_cast<int32_t>(gif_image_ptr->m_ImageInfo.height)) { - img_pass_num++; - if (img_pass_num == FX_ArraySize(s_gif_interlace_step)) { - DecodingFailureAtTailCleanup(gif_image_ptr); - return GifDecodeStatus::Error; - } - gif_image_ptr->image_row_num = - s_gif_interlace_step[img_pass_num] / 2; - } - } else { - ReadScanline(gif_image_ptr->image_row_num++, - gif_image_ptr->m_ImageRowBuf.data()); - } - img_row_offset = 0; - img_row_avail_size = gif_img_row_bytes; - ret = m_ImgDecoder.get() - ? m_ImgDecoder->Decode( - data_ptr, *data_size_ptr, - gif_image_ptr->m_ImageRowBuf.data() + img_row_offset, - &img_row_avail_size) - : GifDecodeStatus::Error; - } - if (ret == GifDecodeStatus::Error) { - DecodingFailureAtTailCleanup(gif_image_ptr); - return GifDecodeStatus::Error; - } - } - } - SaveDecodingStatus(GIF_D_STATUS_TAIL); - } - return GifDecodeStatus::Error; -} - -void CGifContext::SetInputBuffer(uint8_t* src_buf, uint32_t src_size) { - next_in = src_buf; - avail_in = src_size; - skip_size = 0; -} - -uint32_t CGifContext::GetAvailInput(uint8_t** avail_buf_ptr) const { - if (avail_buf_ptr) { - *avail_buf_ptr = nullptr; - if (avail_in > 0) - *avail_buf_ptr = next_in; - } - return avail_in; -} - -int32_t CGifContext::GetFrameNum() const { - return pdfium::CollectionSize<int32_t>(m_Images); -} - -uint8_t* CGifContext::ReadData(uint8_t** des_buf_pp, uint32_t data_size) { - if (avail_in < skip_size + data_size) - return nullptr; - - *des_buf_pp = next_in + skip_size; - skip_size += data_size; - return *des_buf_pp; -} - -void CGifContext::SaveDecodingStatus(int32_t status) { - decode_status = status; - next_in += skip_size; - avail_in -= skip_size; - skip_size = 0; -} - -GifDecodeStatus CGifContext::DecodeExtension() { - uint8_t* data_size_ptr = nullptr; - uint8_t* data_ptr = nullptr; - uint32_t skip_size_org = skip_size; - switch (decode_status) { - case GIF_D_STATUS_EXT_CE: { - if (!ReadData(&data_size_ptr, 1)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - cmt_data.clear(); - while (*data_size_ptr != GIF_BLOCK_TERMINAL) { - uint8_t data_size = *data_size_ptr; - if (!ReadData(&data_ptr, *data_size_ptr) || - !ReadData(&data_size_ptr, 1)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - cmt_data += ByteString(data_ptr, data_size); - } - break; - } - case GIF_D_STATUS_EXT_PTE: { - GifPlainTextExtension* gif_pte = nullptr; - if (!ReadData(reinterpret_cast<uint8_t**>(&gif_pte), 13)) - return GifDecodeStatus::Unfinished; - - m_GraphicControlExtension = nullptr; - if (!ReadData(&data_size_ptr, 1)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - while (*data_size_ptr != GIF_BLOCK_TERMINAL) { - if (!ReadData(&data_ptr, *data_size_ptr) || - !ReadData(&data_size_ptr, 1)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - } - break; - } - case GIF_D_STATUS_EXT_GCE: { - GifGraphicControlExtension* gif_gce_ptr = nullptr; - if (!ReadData(reinterpret_cast<uint8_t**>(&gif_gce_ptr), 6)) - return GifDecodeStatus::Unfinished; - - if (!m_GraphicControlExtension.get()) - m_GraphicControlExtension = - pdfium::MakeUnique<GifGraphicControlExtension>(); - m_GraphicControlExtension->block_size = gif_gce_ptr->block_size; - m_GraphicControlExtension->gce_flags = gif_gce_ptr->gce_flags; - m_GraphicControlExtension->delay_time = GetWord_LSBFirst( - reinterpret_cast<uint8_t*>(&gif_gce_ptr->delay_time)); - m_GraphicControlExtension->trans_index = gif_gce_ptr->trans_index; - break; - } - default: { - if (decode_status == GIF_D_STATUS_EXT_PTE) - m_GraphicControlExtension = nullptr; - if (!ReadData(&data_size_ptr, 1)) - return GifDecodeStatus::Unfinished; - - while (*data_size_ptr != GIF_BLOCK_TERMINAL) { - if (!ReadData(&data_ptr, *data_size_ptr) || - !ReadData(&data_size_ptr, 1)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - } - } - } - SaveDecodingStatus(GIF_D_STATUS_SIG); - return GifDecodeStatus::Success; -} - -GifDecodeStatus CGifContext::DecodeImageInfo() { - if (width == 0 || height == 0) - return GifDecodeStatus::Error; - - uint32_t skip_size_org = skip_size; - GifImageInfo* gif_img_info_ptr = nullptr; - if (!ReadData(reinterpret_cast<uint8_t**>(&gif_img_info_ptr), 9)) - return GifDecodeStatus::Unfinished; - - auto gif_image = pdfium::MakeUnique<GifImage>(); - gif_image->m_ImageInfo.left = - GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->left)); - gif_image->m_ImageInfo.top = - GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->top)); - gif_image->m_ImageInfo.width = - GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->width)); - gif_image->m_ImageInfo.height = - GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->height)); - gif_image->m_ImageInfo.local_flags = gif_img_info_ptr->local_flags; - if (gif_image->m_ImageInfo.left + gif_image->m_ImageInfo.width > width || - gif_image->m_ImageInfo.top + gif_image->m_ImageInfo.height > height) - return GifDecodeStatus::Error; - - GifLocalFlags* gif_img_info_lf_ptr = &gif_img_info_ptr->local_flags; - if (gif_img_info_lf_ptr->local_pal) { - gif_image->local_pallette_exp = gif_img_info_lf_ptr->pal_bits; - uint32_t loc_pal_size = unsigned(2 << gif_img_info_lf_ptr->pal_bits) * 3u; - uint8_t* loc_pal_ptr = nullptr; - if (!ReadData(&loc_pal_ptr, loc_pal_size)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - gif_image->m_LocalPalettes = std::vector<GifPalette>(loc_pal_size / 3); - std::copy(loc_pal_ptr, loc_pal_ptr + loc_pal_size, - reinterpret_cast<uint8_t*>(gif_image->m_LocalPalettes.data())); - } - - uint8_t* code_size_ptr = nullptr; - if (!ReadData(&code_size_ptr, 1)) { - skip_size = skip_size_org; - return GifDecodeStatus::Unfinished; - } - - gif_image->image_code_exp = *code_size_ptr; - RecordCurrentPosition(&gif_image->image_data_pos); - gif_image->image_data_pos += skip_size; - gif_image->m_ImageGCE = nullptr; - if (m_GraphicControlExtension.get()) { - gif_image->m_ImageGCE = std::move(m_GraphicControlExtension); - m_GraphicControlExtension = nullptr; - } - m_Images.push_back(std::move(gif_image)); - SaveDecodingStatus(GIF_D_STATUS_IMG_DATA); - return GifDecodeStatus::Success; -} - -void CGifContext::DecodingFailureAtTailCleanup(GifImage* gif_image_ptr) { - gif_image_ptr->m_ImageRowBuf.clear(); - SaveDecodingStatus(GIF_D_STATUS_TAIL); -} |