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authorRyan Harrison <rharrison@chromium.org>2018-02-06 15:31:04 +0000
committerChromium commit bot <commit-bot@chromium.org>2018-02-06 15:31:04 +0000
commitb105152222f9dfb387efa6a70dedf3dd0ceb2cd5 (patch)
tree8d1421a7f40b094315bd87ad26deedd457f3e890 /core/fxcodec/bmp/fx_bmp.cpp
parent980beeb5b06facc5bf178c03394ad9487b9b4b69 (diff)
downloadpdfium-b105152222f9dfb387efa6a70dedf3dd0ceb2cd5.tar.xz
Move core/fxcodec/lbmp/ -> core/fxcodec/bmp/
BUG=chromium:808336 Change-Id: Id721787dd77d1bcac6daf6e3c149f79e8d1d9fe4 Reviewed-on: https://pdfium-review.googlesource.com/25610 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Diffstat (limited to 'core/fxcodec/bmp/fx_bmp.cpp')
-rw-r--r--core/fxcodec/bmp/fx_bmp.cpp675
1 files changed, 675 insertions, 0 deletions
diff --git a/core/fxcodec/bmp/fx_bmp.cpp b/core/fxcodec/bmp/fx_bmp.cpp
new file mode 100644
index 0000000000..31a93287f1
--- /dev/null
+++ b/core/fxcodec/bmp/fx_bmp.cpp
@@ -0,0 +1,675 @@
+// Copyright 2014 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/bmp/fx_bmp.h"
+
+#include <algorithm>
+#include <limits>
+
+#include "core/fxcrt/fx_system.h"
+#include "third_party/base/logging.h"
+#include "third_party/base/ptr_util.h"
+
+static_assert(sizeof(BmpFileHeader) == 14,
+ "BmpFileHeader should have a size of 14");
+
+namespace {
+
+const size_t kBmpCoreHeaderSize = 12;
+const size_t kBmpInfoHeaderSize = 40;
+
+uint8_t HalfRoundUp(uint8_t value) {
+ uint16_t value16 = value;
+ return static_cast<uint8_t>((value16 + 1) / 2);
+}
+
+} // namespace
+
+BMPDecompressor::BMPDecompressor()
+ : context_ptr_(nullptr),
+ next_in_(nullptr),
+ header_offset_(0),
+ width_(0),
+ height_(0),
+ compress_flag_(0),
+ components_(0),
+ src_row_bytes_(0),
+ out_row_bytes_(0),
+ bit_counts_(0),
+ color_used_(0),
+ imgTB_flag_(false),
+ pal_num_(0),
+ pal_type_(0),
+ data_size_(0),
+ img_data_offset_(0),
+ img_ifh_size_(0),
+ row_num_(0),
+ col_num_(0),
+ dpi_x_(0),
+ dpi_y_(0),
+ mask_red_(0),
+ mask_green_(0),
+ mask_blue_(0),
+ avail_in_(0),
+ skip_size_(0),
+ decode_status_(BMP_D_STATUS_HEADER) {}
+
+BMPDecompressor::~BMPDecompressor() {}
+
+void BMPDecompressor::Error() {
+ longjmp(jmpbuf_, 1);
+}
+
+void BMPDecompressor::ReadScanline(uint32_t row_num_,
+ const std::vector<uint8_t>& row_buf) {
+ auto* p = reinterpret_cast<CBmpContext*>(context_ptr_);
+ p->m_pDelegate->BmpReadScanline(row_num_, row_buf);
+}
+
+bool BMPDecompressor::GetDataPosition(uint32_t rcd_pos) {
+ auto* p = reinterpret_cast<CBmpContext*>(context_ptr_);
+ return p->m_pDelegate->BmpInputImagePositionBuf(rcd_pos);
+}
+
+int32_t BMPDecompressor::ReadHeader() {
+ uint32_t skip_size_org = skip_size_;
+ if (decode_status_ == BMP_D_STATUS_HEADER) {
+ BmpFileHeader* pBmp_header = nullptr;
+ if (!ReadData(reinterpret_cast<uint8_t**>(&pBmp_header),
+ sizeof(BmpFileHeader))) {
+ return 2;
+ }
+
+ pBmp_header->bfType =
+ FXWORD_GET_LSBFIRST(reinterpret_cast<uint8_t*>(&pBmp_header->bfType));
+ pBmp_header->bfOffBits = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_header->bfOffBits));
+ data_size_ =
+ FXDWORD_GET_LSBFIRST(reinterpret_cast<uint8_t*>(&pBmp_header->bfSize));
+ if (pBmp_header->bfType != BMP_SIGNATURE) {
+ Error();
+ NOTREACHED();
+ }
+ if (avail_in_ < sizeof(uint32_t)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ img_ifh_size_ =
+ FXDWORD_GET_LSBFIRST(static_cast<uint8_t*>(next_in_ + skip_size_));
+ pal_type_ = 0;
+ static_assert(sizeof(BmpCoreHeader) == kBmpCoreHeaderSize,
+ "BmpCoreHeader has wrong size");
+ static_assert(sizeof(BmpInfoHeader) == kBmpInfoHeaderSize,
+ "BmpInfoHeader has wrong size");
+ switch (img_ifh_size_) {
+ case kBmpCoreHeaderSize: {
+ pal_type_ = 1;
+ BmpCoreHeader* pBmp_core_header = nullptr;
+ if (!ReadData(reinterpret_cast<uint8_t**>(&pBmp_core_header),
+ img_ifh_size_)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ width_ = FXWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_core_header->bcWidth));
+ height_ = FXWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_core_header->bcHeight));
+ bit_counts_ = FXWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_core_header->bcBitCount));
+ compress_flag_ = BMP_RGB;
+ imgTB_flag_ = false;
+ } break;
+ case kBmpInfoHeaderSize: {
+ BmpInfoHeader* pBmp_info_header = nullptr;
+ if (!ReadData(reinterpret_cast<uint8_t**>(&pBmp_info_header),
+ img_ifh_size_)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ width_ = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biWidth));
+ int32_t signed_height = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biHeight));
+ bit_counts_ = FXWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biBitCount));
+ compress_flag_ = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biCompression));
+ color_used_ = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biClrUsed));
+ dpi_x_ = static_cast<int32_t>(FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biXPelsPerMeter)));
+ dpi_y_ = static_cast<int32_t>(FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biYPelsPerMeter)));
+ SetHeight(signed_height);
+ } break;
+ default: {
+ if (img_ifh_size_ >
+ std::min(kBmpInfoHeaderSize, sizeof(BmpInfoHeader))) {
+ BmpInfoHeader* pBmp_info_header = nullptr;
+ if (!ReadData(reinterpret_cast<uint8_t**>(&pBmp_info_header),
+ img_ifh_size_)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ uint16_t biPlanes;
+ width_ = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biWidth));
+ int32_t signed_height = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biHeight));
+ bit_counts_ = FXWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biBitCount));
+ compress_flag_ = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biCompression));
+ color_used_ = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biClrUsed));
+ biPlanes = FXWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biPlanes));
+ dpi_x_ = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biXPelsPerMeter));
+ dpi_y_ = FXDWORD_GET_LSBFIRST(
+ reinterpret_cast<uint8_t*>(&pBmp_info_header->biYPelsPerMeter));
+ SetHeight(signed_height);
+ if (compress_flag_ == BMP_RGB && biPlanes == 1 && color_used_ == 0)
+ break;
+ }
+ Error();
+ NOTREACHED();
+ }
+ }
+ if (width_ > BMP_MAX_WIDTH || compress_flag_ > BMP_BITFIELDS) {
+ Error();
+ NOTREACHED();
+ }
+ switch (bit_counts_) {
+ case 1:
+ case 4:
+ case 8:
+ case 16:
+ case 24: {
+ if (color_used_ > 1U << bit_counts_) {
+ Error();
+ NOTREACHED();
+ }
+ }
+ case 32:
+ break;
+ default:
+ Error();
+ NOTREACHED();
+ }
+ src_row_bytes_ = BMP_WIDTHBYTES(width_, bit_counts_);
+ switch (bit_counts_) {
+ case 1:
+ case 4:
+ case 8:
+ out_row_bytes_ = BMP_WIDTHBYTES(width_, 8);
+ components_ = 1;
+ break;
+ case 16:
+ case 24:
+ out_row_bytes_ = BMP_WIDTHBYTES(width_, 24);
+ components_ = 3;
+ break;
+ case 32:
+ out_row_bytes_ = src_row_bytes_;
+ components_ = 4;
+ break;
+ }
+ out_row_buffer_.clear();
+
+ if (out_row_bytes_ <= 0) {
+ Error();
+ NOTREACHED();
+ }
+
+ out_row_buffer_.resize(out_row_bytes_);
+ SaveDecodingStatus(BMP_D_STATUS_PAL);
+ }
+ if (decode_status_ == BMP_D_STATUS_PAL) {
+ skip_size_org = skip_size_;
+ if (compress_flag_ == BMP_BITFIELDS) {
+ if (bit_counts_ != 16 && bit_counts_ != 32) {
+ Error();
+ NOTREACHED();
+ }
+ uint32_t* mask;
+ if (ReadData(reinterpret_cast<uint8_t**>(&mask), 3 * sizeof(uint32_t)) ==
+ nullptr) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ mask_red_ = FXDWORD_GET_LSBFIRST(reinterpret_cast<uint8_t*>(&mask[0]));
+ mask_green_ = FXDWORD_GET_LSBFIRST(reinterpret_cast<uint8_t*>(&mask[1]));
+ mask_blue_ = FXDWORD_GET_LSBFIRST(reinterpret_cast<uint8_t*>(&mask[2]));
+ if (mask_red_ & mask_green_ || mask_red_ & mask_blue_ ||
+ mask_green_ & mask_blue_) {
+ Error();
+ NOTREACHED();
+ }
+ header_offset_ = std::max(header_offset_, 26 + img_ifh_size_);
+ SaveDecodingStatus(BMP_D_STATUS_DATA_PRE);
+ return 1;
+ } else if (bit_counts_ == 16) {
+ mask_red_ = 0x7C00;
+ mask_green_ = 0x03E0;
+ mask_blue_ = 0x001F;
+ }
+ pal_num_ = 0;
+ if (bit_counts_ < 16) {
+ pal_num_ = 1 << bit_counts_;
+ if (color_used_ != 0)
+ pal_num_ = color_used_;
+ uint8_t* src_pal_ptr = nullptr;
+ uint32_t src_pal_size = pal_num_ * (pal_type_ ? 3 : 4);
+ if (ReadData(&src_pal_ptr, src_pal_size) == nullptr) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ palette_.resize(pal_num_);
+ int32_t src_pal_index = 0;
+ if (pal_type_ == BMP_PAL_OLD) {
+ while (src_pal_index < pal_num_) {
+ palette_[src_pal_index++] = BMP_PAL_ENCODE(
+ 0x00, src_pal_ptr[2], src_pal_ptr[1], src_pal_ptr[0]);
+ src_pal_ptr += 3;
+ }
+ } else {
+ while (src_pal_index < pal_num_) {
+ palette_[src_pal_index++] = BMP_PAL_ENCODE(
+ src_pal_ptr[3], src_pal_ptr[2], src_pal_ptr[1], src_pal_ptr[0]);
+ src_pal_ptr += 4;
+ }
+ }
+ }
+ header_offset_ = std::max(
+ header_offset_, 14 + img_ifh_size_ + pal_num_ * (pal_type_ ? 3 : 4));
+ SaveDecodingStatus(BMP_D_STATUS_DATA_PRE);
+ }
+ return 1;
+}
+
+bool BMPDecompressor::ValidateFlag() const {
+ switch (compress_flag_) {
+ case BMP_RGB:
+ case BMP_BITFIELDS:
+ case BMP_RLE8:
+ case BMP_RLE4:
+ return true;
+ default:
+ return false;
+ }
+}
+
+int32_t BMPDecompressor::DecodeImage() {
+ if (decode_status_ == BMP_D_STATUS_DATA_PRE) {
+ avail_in_ = 0;
+ if (!GetDataPosition(header_offset_)) {
+ decode_status_ = BMP_D_STATUS_TAIL;
+ Error();
+ NOTREACHED();
+ }
+ row_num_ = 0;
+ SaveDecodingStatus(BMP_D_STATUS_DATA);
+ }
+ if (decode_status_ != BMP_D_STATUS_DATA || !ValidateFlag()) {
+ Error();
+ NOTREACHED();
+ }
+ switch (compress_flag_) {
+ case BMP_RGB:
+ case BMP_BITFIELDS:
+ return DecodeRGB();
+ case BMP_RLE8:
+ return DecodeRLE8();
+ case BMP_RLE4:
+ return DecodeRLE4();
+ default:
+ return 0;
+ }
+}
+
+bool BMPDecompressor::ValidateColorIndex(uint8_t val) {
+ if (val >= pal_num_) {
+ Error();
+ NOTREACHED();
+ }
+ return true;
+}
+
+int32_t BMPDecompressor::DecodeRGB() {
+ uint8_t* des_buf = nullptr;
+ while (row_num_ < height_) {
+ size_t idx = 0;
+ if (!ReadData(&des_buf, src_row_bytes_))
+ return 2;
+
+ SaveDecodingStatus(BMP_D_STATUS_DATA);
+ switch (bit_counts_) {
+ case 1: {
+ for (uint32_t col = 0; col < width_; ++col)
+ out_row_buffer_[idx++] =
+ des_buf[col >> 3] & (0x80 >> (col % 8)) ? 0x01 : 0x00;
+ } break;
+ case 4: {
+ for (uint32_t col = 0; col < width_; ++col) {
+ out_row_buffer_[idx++] = (col & 0x01)
+ ? (des_buf[col >> 1] & 0x0F)
+ : ((des_buf[col >> 1] & 0xF0) >> 4);
+ }
+ } break;
+ case 16: {
+ uint16_t* buf = (uint16_t*)des_buf;
+ uint8_t blue_bits = 0;
+ uint8_t green_bits = 0;
+ uint8_t red_bits = 0;
+ for (int32_t i = 0; i < 16; i++) {
+ if ((mask_blue_ >> i) & 0x01)
+ blue_bits++;
+ if ((mask_green_ >> i) & 0x01)
+ green_bits++;
+ if ((mask_red_ >> i) & 0x01)
+ red_bits++;
+ }
+ green_bits += blue_bits;
+ red_bits += green_bits;
+ if (blue_bits > 8 || green_bits < 8 || red_bits < 8)
+ return 2;
+ blue_bits = 8 - blue_bits;
+ green_bits -= 8;
+ red_bits -= 8;
+ for (uint32_t col = 0; col < width_; ++col) {
+ *buf = FXWORD_GET_LSBFIRST(reinterpret_cast<uint8_t*>(buf));
+ out_row_buffer_[idx++] =
+ static_cast<uint8_t>((*buf & mask_blue_) << blue_bits);
+ out_row_buffer_[idx++] =
+ static_cast<uint8_t>((*buf & mask_green_) >> green_bits);
+ out_row_buffer_[idx++] =
+ static_cast<uint8_t>((*buf++ & mask_red_) >> red_bits);
+ }
+ } break;
+ case 8:
+ case 24:
+ case 32:
+ std::copy(des_buf, des_buf + src_row_bytes_, out_row_buffer_.begin());
+ idx += src_row_bytes_;
+ break;
+ }
+ for (uint8_t byte : out_row_buffer_) {
+ if (!ValidateColorIndex(byte))
+ return 0;
+ }
+ ReadScanline(imgTB_flag_ ? row_num_++ : (height_ - 1 - row_num_++),
+ out_row_buffer_);
+ }
+ SaveDecodingStatus(BMP_D_STATUS_TAIL);
+ return 1;
+}
+
+int32_t BMPDecompressor::DecodeRLE8() {
+ uint8_t* first_byte_ptr = nullptr;
+ uint8_t* second_byte_ptr = nullptr;
+ col_num_ = 0;
+ while (true) {
+ uint32_t skip_size_org = skip_size_;
+ if (!ReadData(&first_byte_ptr, 1))
+ return 2;
+
+ switch (*first_byte_ptr) {
+ case RLE_MARKER: {
+ if (!ReadData(&first_byte_ptr, 1)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ switch (*first_byte_ptr) {
+ case RLE_EOL: {
+ if (row_num_ >= height_) {
+ SaveDecodingStatus(BMP_D_STATUS_TAIL);
+ Error();
+ NOTREACHED();
+ }
+ ReadScanline(imgTB_flag_ ? row_num_++ : (height_ - 1 - row_num_++),
+ out_row_buffer_);
+ col_num_ = 0;
+ std::fill(out_row_buffer_.begin(), out_row_buffer_.end(), 0);
+ SaveDecodingStatus(BMP_D_STATUS_DATA);
+ continue;
+ }
+ case RLE_EOI: {
+ if (row_num_ < height_) {
+ ReadScanline(
+ imgTB_flag_ ? row_num_++ : (height_ - 1 - row_num_++),
+ out_row_buffer_);
+ }
+ SaveDecodingStatus(BMP_D_STATUS_TAIL);
+ return 1;
+ }
+ case RLE_DELTA: {
+ uint8_t* delta_ptr;
+ if (!ReadData(&delta_ptr, 2)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ col_num_ += delta_ptr[0];
+ size_t bmp_row_num__next = row_num_ + delta_ptr[1];
+ if (col_num_ >= out_row_bytes_ || bmp_row_num__next >= height_) {
+ Error();
+ NOTREACHED();
+ }
+ while (row_num_ < bmp_row_num__next) {
+ std::fill(out_row_buffer_.begin(), out_row_buffer_.end(), 0);
+ ReadScanline(
+ imgTB_flag_ ? row_num_++ : (height_ - 1 - row_num_++),
+ out_row_buffer_);
+ }
+ } break;
+ default: {
+ int32_t avail_size = out_row_bytes_ - col_num_;
+ if (!avail_size ||
+ static_cast<int32_t>(*first_byte_ptr) > avail_size) {
+ Error();
+ NOTREACHED();
+ }
+ if (!ReadData(&second_byte_ptr, *first_byte_ptr & 1
+ ? *first_byte_ptr + 1
+ : *first_byte_ptr)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ std::copy(second_byte_ptr, second_byte_ptr + *first_byte_ptr,
+ out_row_buffer_.begin() + col_num_);
+ for (size_t i = col_num_; i < col_num_ + *first_byte_ptr; ++i) {
+ if (!ValidateColorIndex(out_row_buffer_[i]))
+ return 0;
+ }
+ col_num_ += *first_byte_ptr;
+ }
+ }
+ } break;
+ default: {
+ int32_t avail_size = out_row_bytes_ - col_num_;
+ if (!avail_size || static_cast<int32_t>(*first_byte_ptr) > avail_size) {
+ Error();
+ NOTREACHED();
+ }
+ if (!ReadData(&second_byte_ptr, 1)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ std::fill(out_row_buffer_.begin() + col_num_,
+ out_row_buffer_.begin() + col_num_ + *first_byte_ptr,
+ *second_byte_ptr);
+ if (!ValidateColorIndex(out_row_buffer_[col_num_]))
+ return 0;
+ col_num_ += *first_byte_ptr;
+ }
+ }
+ }
+ Error();
+ NOTREACHED();
+}
+
+int32_t BMPDecompressor::DecodeRLE4() {
+ uint8_t* first_byte_ptr = nullptr;
+ uint8_t* second_byte_ptr = nullptr;
+ col_num_ = 0;
+ while (true) {
+ uint32_t skip_size_org = skip_size_;
+ if (!ReadData(&first_byte_ptr, 1))
+ return 2;
+
+ switch (*first_byte_ptr) {
+ case RLE_MARKER: {
+ if (!ReadData(&first_byte_ptr, 1)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ switch (*first_byte_ptr) {
+ case RLE_EOL: {
+ if (row_num_ >= height_) {
+ SaveDecodingStatus(BMP_D_STATUS_TAIL);
+ Error();
+ NOTREACHED();
+ }
+ ReadScanline(imgTB_flag_ ? row_num_++ : (height_ - 1 - row_num_++),
+ out_row_buffer_);
+ col_num_ = 0;
+ std::fill(out_row_buffer_.begin(), out_row_buffer_.end(), 0);
+ SaveDecodingStatus(BMP_D_STATUS_DATA);
+ continue;
+ }
+ case RLE_EOI: {
+ if (row_num_ < height_) {
+ ReadScanline(
+ imgTB_flag_ ? row_num_++ : (height_ - 1 - row_num_++),
+ out_row_buffer_);
+ }
+ SaveDecodingStatus(BMP_D_STATUS_TAIL);
+ return 1;
+ }
+ case RLE_DELTA: {
+ uint8_t* delta_ptr;
+ if (!ReadData(&delta_ptr, 2)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ col_num_ += delta_ptr[0];
+ size_t bmp_row_num__next = row_num_ + delta_ptr[1];
+ if (col_num_ >= out_row_bytes_ || bmp_row_num__next >= height_) {
+ Error();
+ NOTREACHED();
+ }
+ while (row_num_ < bmp_row_num__next) {
+ std::fill(out_row_buffer_.begin(), out_row_buffer_.end(), 0);
+ ReadScanline(
+ imgTB_flag_ ? row_num_++ : (height_ - 1 - row_num_++),
+ out_row_buffer_);
+ }
+ } break;
+ default: {
+ int32_t avail_size = out_row_bytes_ - col_num_;
+ if (!avail_size) {
+ Error();
+ NOTREACHED();
+ }
+ uint8_t size = HalfRoundUp(*first_byte_ptr);
+ if (static_cast<int32_t>(*first_byte_ptr) > avail_size) {
+ if (size + (col_num_ >> 1) > src_row_bytes_) {
+ Error();
+ NOTREACHED();
+ }
+ *first_byte_ptr = avail_size - 1;
+ }
+ if (!ReadData(&second_byte_ptr, size & 1 ? size + 1 : size)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ for (uint8_t i = 0; i < *first_byte_ptr; i++) {
+ uint8_t color = (i & 0x01) ? (*second_byte_ptr++ & 0x0F)
+ : (*second_byte_ptr & 0xF0) >> 4;
+ if (!ValidateColorIndex(color))
+ return 0;
+
+ out_row_buffer_[col_num_++] = color;
+ }
+ }
+ }
+ } break;
+ default: {
+ int32_t avail_size = out_row_bytes_ - col_num_;
+ if (!avail_size) {
+ Error();
+ NOTREACHED();
+ }
+ if (static_cast<int32_t>(*first_byte_ptr) > avail_size) {
+ uint8_t size = HalfRoundUp(*first_byte_ptr);
+ if (size + (col_num_ >> 1) > src_row_bytes_) {
+ Error();
+ NOTREACHED();
+ }
+ *first_byte_ptr = avail_size - 1;
+ }
+ if (!ReadData(&second_byte_ptr, 1)) {
+ skip_size_ = skip_size_org;
+ return 2;
+ }
+ for (uint8_t i = 0; i < *first_byte_ptr; i++) {
+ uint8_t second_byte = *second_byte_ptr;
+ second_byte =
+ i & 0x01 ? (second_byte & 0x0F) : (second_byte & 0xF0) >> 4;
+ if (!ValidateColorIndex(second_byte))
+ return 0;
+ out_row_buffer_[col_num_++] = second_byte;
+ }
+ }
+ }
+ }
+ Error();
+ NOTREACHED();
+}
+
+uint8_t* BMPDecompressor::ReadData(uint8_t** des_buf, uint32_t data_size_) {
+ if (avail_in_ < skip_size_ + data_size_)
+ return nullptr;
+
+ *des_buf = next_in_ + skip_size_;
+ skip_size_ += data_size_;
+ return *des_buf;
+}
+
+void BMPDecompressor::SaveDecodingStatus(int32_t status) {
+ decode_status_ = status;
+ next_in_ += skip_size_;
+ avail_in_ -= skip_size_;
+ skip_size_ = 0;
+}
+
+void BMPDecompressor::SetInputBuffer(uint8_t* src_buf, uint32_t src_size) {
+ next_in_ = src_buf;
+ avail_in_ = src_size;
+ skip_size_ = 0;
+}
+
+uint32_t BMPDecompressor::GetAvailInput(uint8_t** avail_buf) {
+ if (avail_buf) {
+ *avail_buf = nullptr;
+ if (avail_in_ > 0)
+ *avail_buf = next_in_;
+ }
+ return avail_in_;
+}
+
+void BMPDecompressor::SetHeight(int32_t signed_height) {
+ if (signed_height >= 0) {
+ height_ = signed_height;
+ return;
+ }
+ if (signed_height == std::numeric_limits<int>::min()) {
+ Error();
+ NOTREACHED();
+ }
+ height_ = -signed_height;
+ imgTB_flag_ = true;
+}