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// 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;
}