1 files changed, 289 insertions, 0 deletions

diff --git a/media/libjxl/src/lib/extras/dec/jpg.cc b/media/libjxl/src/lib/extras/dec/jpg.cc
new file mode 100644
index 0000000000..6b92f4a8a6
--- /dev/null
+++ b/media/libjxl/src/lib/extras/dec/jpg.cc
@@ -0,0 +1,289 @@
+// 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/jpg.h"
+
+#include <jpeglib.h>
+#include <setjmp.h>
+#include <stdint.h>
+
+#include <algorithm>
+#include <numeric>
+#include <utility>
+#include <vector>
+
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/sanitizers.h"
+
+namespace jxl {
+namespace extras {
+
+namespace {
+
+constexpr unsigned char kICCSignature[12] = {
+    0x49, 0x43, 0x43, 0x5F, 0x50, 0x52, 0x4F, 0x46, 0x49, 0x4C, 0x45, 0x00};
+constexpr int kICCMarker = JPEG_APP0 + 2;
+
+constexpr unsigned char kExifSignature[6] = {0x45, 0x78, 0x69,
+                                             0x66, 0x00, 0x00};
+constexpr int kExifMarker = JPEG_APP0 + 1;
+
+static inline bool IsJPG(const Span<const uint8_t> bytes) {
+  if (bytes.size() < 2) return false;
+  if (bytes[0] != 0xFF || bytes[1] != 0xD8) return false;
+  return true;
+}
+
+bool MarkerIsICC(const jpeg_saved_marker_ptr marker) {
+  return marker->marker == kICCMarker &&
+         marker->data_length >= sizeof kICCSignature + 2 &&
+         std::equal(std::begin(kICCSignature), std::end(kICCSignature),
+                    marker->data);
+}
+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) {
+  constexpr size_t kICCSignatureSize = sizeof kICCSignature;
+  // ICC signature + uint8_t index + uint8_t max_index.
+  constexpr size_t kICCHeadSize = kICCSignatureSize + 2;
+  // Markers are 1-indexed, and we keep them that way in this vector to get a
+  // convenient 0 at the front for when we compute the offsets later.
+  std::vector<size_t> marker_lengths;
+  int num_markers = 0;
+  int seen_markers_count = 0;
+  bool has_num_markers = false;
+  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 (!MarkerIsICC(marker)) continue;
+
+    const int current_marker = marker->data[kICCSignatureSize];
+    if (current_marker == 0) {
+      return JXL_FAILURE("inconsistent JPEG ICC marker numbering");
+    }
+    const int current_num_markers = marker->data[kICCSignatureSize + 1];
+    if (current_marker > current_num_markers) {
+      return JXL_FAILURE("inconsistent JPEG ICC marker numbering");
+    }
+    if (has_num_markers) {
+      if (current_num_markers != num_markers) {
+        return JXL_FAILURE("inconsistent numbers of JPEG ICC markers");
+      }
+    } else {
+      num_markers = current_num_markers;
+      has_num_markers = true;
+      marker_lengths.resize(num_markers + 1);
+    }
+
+    size_t marker_length = marker->data_length - kICCHeadSize;
+
+    if (marker_length == 0) {
+      // NB: if we allow empty chunks, then the next check is incorrect.
+      return JXL_FAILURE("Empty ICC chunk");
+    }
+
+    if (marker_lengths[current_marker] != 0) {
+      return JXL_FAILURE("duplicate JPEG ICC marker number");
+    }
+    marker_lengths[current_marker] = marker_length;
+    seen_markers_count++;
+  }
+
+  if (marker_lengths.empty()) {
+    // Not an error.
+    return false;
+  }
+
+  if (seen_markers_count != num_markers) {
+    JXL_DASSERT(has_num_markers);
+    return JXL_FAILURE("Incomplete set of ICC chunks");
+  }
+
+  std::vector<size_t> offsets = std::move(marker_lengths);
+  std::partial_sum(offsets.begin(), offsets.end(), offsets.begin());
+  icc->resize(offsets.back());
+
+  for (jpeg_saved_marker_ptr marker = cinfo->marker_list; marker != nullptr;
+       marker = marker->next) {
+    if (!MarkerIsICC(marker)) continue;
+    const uint8_t* first = marker->data + kICCHeadSize;
+    uint8_t current_marker = marker->data[kICCSignatureSize];
+    size_t offset = offsets[current_marker - 1];
+    size_t marker_length = offsets[current_marker] - offset;
+    std::copy_n(first, marker_length, icc->data() + offset);
+  }
+
+  return true;
+}
+
+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;
+  }
+}
+
+void MyErrorExit(j_common_ptr cinfo) {
+  jmp_buf* env = static_cast<jmp_buf*>(cinfo->client_data);
+  (*cinfo->err->output_message)(cinfo);
+  jpeg_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
+}
+
+}  // namespace
+
+Status DecodeImageJPG(const Span<const uint8_t> bytes,
+                      const ColorHints& color_hints,
+                      const SizeConstraints& constraints,
+                      PackedPixelFile* ppf) {
+  // Don't do anything for non-JPEG files (no need to report an error)
+  if (!IsJPG(bytes)) 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;
+
+  const auto try_catch_block = [&]() -> bool {
+    jpeg_decompress_struct cinfo;
+    // cinfo is initialized by libjpeg, which we are not instrumenting with
+    // msan, therefore we need to initialize cinfo here.
+    msan::UnpoisonMemory(&cinfo, sizeof(cinfo));
+    // 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 = jpeg_std_error(&jerr);
+    jerr.error_exit = &MyErrorExit;
+    jerr.output_message = &MyOutputMessage;
+    if (setjmp(env)) {
+      return false;
+    }
+    cinfo.client_data = static_cast<void*>(&env);
+
+    jpeg_create_decompress(&cinfo);
+    jpeg_mem_src(&cinfo, reinterpret_cast<const unsigned char*>(bytes.data()),
+                 bytes.size());
+    jpeg_save_markers(&cinfo, kICCMarker, 0xFFFF);
+    jpeg_save_markers(&cinfo, kExifMarker, 0xFFFF);
+    const auto failure = [&cinfo](const char* str) -> Status {
+      jpeg_abort_decompress(&cinfo);
+      jpeg_destroy_decompress(&cinfo);
+      return JXL_FAILURE("%s", str);
+    };
+    int read_header_result = jpeg_read_header(&cinfo, TRUE);
+    // TODO(eustas): what about JPEG_HEADER_TABLES_ONLY?
+    if (read_header_result == JPEG_SUSPENDED) {
+      return failure("truncated JPEG input");
+    }
+    if (!VerifyDimensions(&constraints, cinfo.image_width,
+                          cinfo.image_height)) {
+      return failure("image too big");
+    }
+    // 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 (!ReadICCProfile(&cinfo, &ppf->icc)) {
+      ppf->icc.clear();
+      // Default to SRGB
+      // Actually, (cinfo.output_components == nbcomp) will be checked after
+      // `jpeg_start_decompress`.
+      ppf->color_encoding.color_space =
+          (nbcomp == 1) ? JXL_COLOR_SPACE_GRAY : JXL_COLOR_SPACE_RGB;
+      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);
+    if (!ApplyColorHints(color_hints, /*color_already_set=*/true,
+                         /*is_gray=*/false, ppf)) {
+      return failure("ApplyColorHints failed");
+    }
+
+    ppf->info.xsize = cinfo.image_width;
+    ppf->info.ysize = cinfo.image_height;
+    // Original data is uint, so exponent_bits_per_sample = 0.
+    ppf->info.bits_per_sample = BITS_IN_JSAMPLE;
+    JXL_ASSERT(BITS_IN_JSAMPLE == 8 || BITS_IN_JSAMPLE == 16);
+    ppf->info.exponent_bits_per_sample = 0;
+    ppf->info.uses_original_profile = true;
+
+    // No alpha in JPG
+    ppf->info.alpha_bits = 0;
+    ppf->info.alpha_exponent_bits = 0;
+
+    ppf->info.num_color_channels = nbcomp;
+    ppf->info.orientation = JXL_ORIENT_IDENTITY;
+
+    jpeg_start_decompress(&cinfo);
+    JXL_ASSERT(cinfo.output_components == nbcomp);
+
+    const JxlPixelFormat format{
+        /*num_channels=*/static_cast<uint32_t>(nbcomp),
+        /*data_type=*/BITS_IN_JSAMPLE == 8 ? JXL_TYPE_UINT8 : JXL_TYPE_UINT16,
+        /*endianness=*/JXL_NATIVE_ENDIAN,
+        /*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.output_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)};
+      jpeg_read_scanlines(&cinfo, rows, 1);
+      msan::UnpoisonMemory(rows[0], sizeof(JSAMPLE) * cinfo.output_components *
+                                        cinfo.image_width);
+    }
+
+    jpeg_finish_decompress(&cinfo);
+    jpeg_destroy_decompress(&cinfo);
+    return true;
+  };
+
+  return try_catch_block();
+}
+
+}  // namespace extras
+}  // namespace jxl