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Diffstat (limited to 'lib/extras/dec/jpegli.cc')
| -rw-r--r-- | lib/extras/dec/jpegli.cc | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/lib/extras/dec/jpegli.cc b/lib/extras/dec/jpegli.cc new file mode 100644 index 0000000..ffa1b79 --- /dev/null +++ b/lib/extras/dec/jpegli.cc @@ -0,0 +1,271 @@ +// Copyright (c) the JPEG XL Project Authors. All rights reserved. +// +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#include "lib/extras/dec/jpegli.h" + +#include <setjmp.h> +#include <stdint.h> + +#include <algorithm> +#include <numeric> +#include <utility> +#include <vector> + +#include "lib/jpegli/decode.h" +#include "lib/jxl/base/status.h" +#include "lib/jxl/sanitizers.h" + +namespace jxl { +namespace extras { + +namespace { + +constexpr unsigned char kExifSignature[6] = {0x45, 0x78, 0x69, + 0x66, 0x00, 0x00}; +constexpr int kExifMarker = JPEG_APP0 + 1; +constexpr int kICCMarker = JPEG_APP0 + 2; + +static inline bool IsJPG(const std::vector<uint8_t>& bytes) { + if (bytes.size() < 2) return false; + if (bytes[0] != 0xFF || bytes[1] != 0xD8) return false; + return true; +} + +bool MarkerIsExif(const jpeg_saved_marker_ptr marker) { + return marker->marker == kExifMarker && + marker->data_length >= sizeof kExifSignature + 2 && + std::equal(std::begin(kExifSignature), std::end(kExifSignature), + marker->data); +} + +Status ReadICCProfile(jpeg_decompress_struct* const cinfo, + std::vector<uint8_t>* const icc) { + uint8_t* icc_data_ptr; + unsigned int icc_data_len; + if (jpegli_read_icc_profile(cinfo, &icc_data_ptr, &icc_data_len)) { + icc->assign(icc_data_ptr, icc_data_ptr + icc_data_len); + free(icc_data_ptr); + return true; + } + return false; +} + +void ReadExif(jpeg_decompress_struct* const cinfo, + std::vector<uint8_t>* const exif) { + constexpr size_t kExifSignatureSize = sizeof kExifSignature; + for (jpeg_saved_marker_ptr marker = cinfo->marker_list; marker != nullptr; + marker = marker->next) { + // marker is initialized by libjpeg, which we are not instrumenting with + // msan. + msan::UnpoisonMemory(marker, sizeof(*marker)); + msan::UnpoisonMemory(marker->data, marker->data_length); + if (!MarkerIsExif(marker)) continue; + size_t marker_length = marker->data_length - kExifSignatureSize; + exif->resize(marker_length); + std::copy_n(marker->data + kExifSignatureSize, marker_length, exif->data()); + return; + } +} + +JpegliDataType ConvertDataType(JxlDataType type) { + switch (type) { + case JXL_TYPE_UINT8: + return JPEGLI_TYPE_UINT8; + case JXL_TYPE_UINT16: + return JPEGLI_TYPE_UINT16; + case JXL_TYPE_FLOAT: + return JPEGLI_TYPE_FLOAT; + default: + return JPEGLI_TYPE_UINT8; + } +} + +JpegliEndianness ConvertEndianness(JxlEndianness type) { + switch (type) { + case JXL_NATIVE_ENDIAN: + return JPEGLI_NATIVE_ENDIAN; + case JXL_BIG_ENDIAN: + return JPEGLI_BIG_ENDIAN; + case JXL_LITTLE_ENDIAN: + return JPEGLI_LITTLE_ENDIAN; + default: + return JPEGLI_NATIVE_ENDIAN; + } +} + +JxlColorSpace ConvertColorSpace(J_COLOR_SPACE colorspace) { + switch (colorspace) { + case JCS_GRAYSCALE: + return JXL_COLOR_SPACE_GRAY; + case JCS_RGB: + return JXL_COLOR_SPACE_RGB; + default: + return JXL_COLOR_SPACE_UNKNOWN; + } +} + +void MyErrorExit(j_common_ptr cinfo) { + jmp_buf* env = static_cast<jmp_buf*>(cinfo->client_data); + (*cinfo->err->output_message)(cinfo); + jpegli_destroy_decompress(reinterpret_cast<j_decompress_ptr>(cinfo)); + longjmp(*env, 1); +} + +void MyOutputMessage(j_common_ptr cinfo) { +#if JXL_DEBUG_WARNING == 1 + char buf[JMSG_LENGTH_MAX + 1]; + (*cinfo->err->format_message)(cinfo, buf); + buf[JMSG_LENGTH_MAX] = 0; + JXL_WARNING("%s", buf); +#endif +} + +void UnmapColors(uint8_t* row, size_t xsize, int components, + JSAMPARRAY colormap, size_t num_colors) { + JXL_CHECK(colormap != nullptr); + std::vector<uint8_t> tmp(xsize * components); + for (size_t x = 0; x < xsize; ++x) { + JXL_CHECK(row[x] < num_colors); + for (int c = 0; c < components; ++c) { + tmp[x * components + c] = colormap[c][row[x]]; + } + } + memcpy(row, tmp.data(), tmp.size()); +} + +} // namespace + +Status DecodeJpeg(const std::vector<uint8_t>& compressed, + const JpegDecompressParams& dparams, ThreadPool* pool, + PackedPixelFile* ppf) { + // Don't do anything for non-JPEG files (no need to report an error) + if (!IsJPG(compressed)) return false; + + // TODO(veluca): use JPEGData also for pixels? + + // We need to declare all the non-trivial destructor local variables before + // the call to setjmp(). + std::unique_ptr<JSAMPLE[]> row; + + jpeg_decompress_struct cinfo; + const auto try_catch_block = [&]() -> bool { + // Setup error handling in jpeg library so we can deal with broken jpegs in + // the fuzzer. + jpeg_error_mgr jerr; + jmp_buf env; + cinfo.err = jpegli_std_error(&jerr); + jerr.error_exit = &MyErrorExit; + jerr.output_message = &MyOutputMessage; + if (setjmp(env)) { + return false; + } + cinfo.client_data = static_cast<void*>(&env); + + jpegli_create_decompress(&cinfo); + jpegli_mem_src(&cinfo, + reinterpret_cast<const unsigned char*>(compressed.data()), + compressed.size()); + jpegli_save_markers(&cinfo, kICCMarker, 0xFFFF); + jpegli_save_markers(&cinfo, kExifMarker, 0xFFFF); + const auto failure = [&cinfo](const char* str) -> Status { + jpegli_abort_decompress(&cinfo); + jpegli_destroy_decompress(&cinfo); + return JXL_FAILURE("%s", str); + }; + jpegli_read_header(&cinfo, TRUE); + // Might cause CPU-zip bomb. + if (cinfo.arith_code) { + return failure("arithmetic code JPEGs are not supported"); + } + int nbcomp = cinfo.num_components; + if (nbcomp != 1 && nbcomp != 3) { + return failure("unsupported number of components in JPEG"); + } + if (dparams.force_rgb) { + cinfo.out_color_space = JCS_RGB; + } else if (dparams.force_grayscale) { + cinfo.out_color_space = JCS_GRAYSCALE; + } + if (!ReadICCProfile(&cinfo, &ppf->icc)) { + ppf->icc.clear(); + // Default to SRGB + ppf->color_encoding.color_space = + ConvertColorSpace(cinfo.out_color_space); + ppf->color_encoding.white_point = JXL_WHITE_POINT_D65; + ppf->color_encoding.primaries = JXL_PRIMARIES_SRGB; + ppf->color_encoding.transfer_function = JXL_TRANSFER_FUNCTION_SRGB; + ppf->color_encoding.rendering_intent = JXL_RENDERING_INTENT_PERCEPTUAL; + } + ReadExif(&cinfo, &ppf->metadata.exif); + + ppf->info.xsize = cinfo.image_width; + ppf->info.ysize = cinfo.image_height; + if (dparams.output_data_type == JXL_TYPE_UINT8) { + ppf->info.bits_per_sample = 8; + ppf->info.exponent_bits_per_sample = 0; + } else if (dparams.output_data_type == JXL_TYPE_UINT16) { + ppf->info.bits_per_sample = 16; + ppf->info.exponent_bits_per_sample = 0; + } else if (dparams.output_data_type == JXL_TYPE_FLOAT) { + ppf->info.bits_per_sample = 32; + ppf->info.exponent_bits_per_sample = 8; + } else { + return failure("unsupported data type"); + } + ppf->info.uses_original_profile = true; + + // No alpha in JPG + ppf->info.alpha_bits = 0; + ppf->info.alpha_exponent_bits = 0; + ppf->info.orientation = JXL_ORIENT_IDENTITY; + + jpegli_set_output_format(&cinfo, ConvertDataType(dparams.output_data_type), + ConvertEndianness(dparams.output_endianness)); + + if (dparams.num_colors > 0) { + cinfo.quantize_colors = TRUE; + cinfo.desired_number_of_colors = dparams.num_colors; + cinfo.two_pass_quantize = dparams.two_pass_quant; + cinfo.dither_mode = (J_DITHER_MODE)dparams.dither_mode; + } + + jpegli_start_decompress(&cinfo); + + ppf->info.num_color_channels = cinfo.out_color_components; + const JxlPixelFormat format{ + /*num_channels=*/static_cast<uint32_t>(cinfo.out_color_components), + dparams.output_data_type, + dparams.output_endianness, + /*align=*/0, + }; + ppf->frames.clear(); + // Allocates the frame buffer. + ppf->frames.emplace_back(cinfo.image_width, cinfo.image_height, format); + const auto& frame = ppf->frames.back(); + JXL_ASSERT(sizeof(JSAMPLE) * cinfo.out_color_components * + cinfo.image_width <= + frame.color.stride); + + for (size_t y = 0; y < cinfo.image_height; ++y) { + JSAMPROW rows[] = {reinterpret_cast<JSAMPLE*>( + static_cast<uint8_t*>(frame.color.pixels()) + + frame.color.stride * y)}; + jpegli_read_scanlines(&cinfo, rows, 1); + if (dparams.num_colors > 0) { + UnmapColors(rows[0], cinfo.output_width, cinfo.out_color_components, + cinfo.colormap, cinfo.actual_number_of_colors); + } + } + + jpegli_finish_decompress(&cinfo); + return true; + }; + bool success = try_catch_block(); + jpegli_destroy_decompress(&cinfo); + return success; +} + +} // namespace extras +} // namespace jxl |