| // Copyright 2019 The 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. |
| |
| #include <memory> |
| |
| #include "core/fxcrt/fx_safe_types.h" |
| #include "core/fxge/cfx_cliprgn.h" |
| #include "core/fxge/dib/cfx_dibitmap.h" |
| #include "core/fxge/dib/fx_dib.h" |
| #include "testing/fuzzers/pdfium_fuzzer_util.h" |
| #include "third_party/base/cxx17_backports.h" |
| |
| namespace { |
| |
| // Some unused formats were removed, and their slots have been filled in |
| // `FXDIB_Format::kInvalid` to keep the fuzzer input stable. |
| constexpr FXDIB_Format kFormat[] = { |
| FXDIB_Format::kInvalid, |
| FXDIB_Format::k1bppRgb, |
| FXDIB_Format::k8bppRgb, |
| FXDIB_Format::kRgb, |
| FXDIB_Format::kRgb32, |
| FXDIB_Format::k1bppMask, |
| FXDIB_Format::k8bppMask, |
| FXDIB_Format::kInvalid /* Was FXDIB_Format::k8bppRgba */, |
| FXDIB_Format::kInvalid /* Was FXDIB_Format::kRgba */, |
| FXDIB_Format::kArgb, |
| FXDIB_Format::kInvalid /* Was FXDIB_Format::k1bppCmyk */, |
| FXDIB_Format::kInvalid /* Was FXDIB_Format::k8bppCmyk */, |
| FXDIB_Format::kInvalid /* Was FXDIB_Format::kCmyk */, |
| FXDIB_Format::kInvalid /* Was FXDIB_Format::k8bppCmyka */, |
| FXDIB_Format::kInvalid /* Was FXDIB_Format::kCmyka */}; |
| |
| } // namespace |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { |
| constexpr size_t kParameterSize = 33; |
| if (size < kParameterSize) |
| return 0; |
| |
| int width = GetInteger(data); |
| int height = GetInteger(data + 4); |
| uint32_t argb = GetInteger(data + 8); |
| int src_left = GetInteger(data + 12); |
| int src_top = GetInteger(data + 16); |
| int dest_left = GetInteger(data + 20); |
| int dest_top = GetInteger(data + 24); |
| |
| BlendMode blend_mode = static_cast<BlendMode>( |
| data[28] % (static_cast<int>(BlendMode::kLast) + 1)); |
| FXDIB_Format dest_format = kFormat[data[29] % pdfium::size(kFormat)]; |
| FXDIB_Format src_format = kFormat[data[30] % pdfium::size(kFormat)]; |
| bool is_clip = !(data[31] % 2); |
| bool is_rgb_byte_order = !(data[32] % 2); |
| size -= kParameterSize; |
| data += kParameterSize; |
| |
| static constexpr uint32_t kMemLimit = 512000000; // 512 MB |
| static constexpr uint32_t kComponents = 4; |
| FX_SAFE_UINT32 mem = width; |
| mem *= height; |
| mem *= kComponents; |
| if (!mem.IsValid() || mem.ValueOrDie() > kMemLimit) |
| return 0; |
| |
| auto src_bitmap = pdfium::MakeRetain<CFX_DIBitmap>(); |
| auto dest_bitmap = pdfium::MakeRetain<CFX_DIBitmap>(); |
| if (!src_bitmap->Create(width, height, src_format) || |
| !dest_bitmap->Create(width, height, dest_format)) { |
| return 0; |
| } |
| if (!src_bitmap->GetBuffer() || !dest_bitmap->GetBuffer()) { |
| return 0; |
| } |
| |
| std::unique_ptr<CFX_ClipRgn> clip_rgn; |
| if (is_clip) |
| clip_rgn = std::make_unique<CFX_ClipRgn>(width, height); |
| if (src_bitmap->IsMaskFormat()) { |
| dest_bitmap->CompositeMask(dest_left, dest_top, width, height, src_bitmap, |
| argb, src_left, src_top, blend_mode, |
| clip_rgn.get(), is_rgb_byte_order); |
| } else { |
| dest_bitmap->CompositeBitmap(dest_left, dest_top, width, height, src_bitmap, |
| src_left, src_top, blend_mode, clip_rgn.get(), |
| is_rgb_byte_order); |
| } |
| return 0; |
| } |