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// Copyright 2017 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/fxcodec/gif/cfx_gifcontext.h"
#include <stdint.h>
#include <utility>
#include "core/fxcodec/cfx_codec_memory.h"
#include "core/fxcrt/data_vector.h"
#include "core/fxcrt/span_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace fxcodec {
class CFX_GifContextForTest final : public CFX_GifContext {
public:
CFX_GifContextForTest() : CFX_GifContext(nullptr) {}
~CFX_GifContextForTest() override = default;
using CFX_GifContext::ReadAllOrNone;
using CFX_GifContext::ReadGifSignature;
using CFX_GifContext::ReadLogicalScreenDescriptor;
CFX_CodecMemory* InputBuffer() const { return input_buffer_.Get(); }
void SetTestInputBuffer(pdfium::span<uint8_t> input) {
auto pMemory = pdfium::MakeRetain<CFX_CodecMemory>(input.size());
fxcrt::spancpy(pMemory->GetBufferSpan(), input);
SetInputBuffer(std::move(pMemory));
}
};
TEST(CFX_GifContext, SetInputBuffer) {
uint8_t buffer[] = {0x00, 0x01, 0x02};
CFX_GifContextForTest context;
context.SetTestInputBuffer({nullptr, 0});
EXPECT_EQ(0u, context.InputBuffer()->GetSize());
EXPECT_EQ(0u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({buffer, 0});
EXPECT_EQ(0u, context.InputBuffer()->GetSize());
EXPECT_EQ(0u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({buffer, 3});
EXPECT_EQ(3u, context.InputBuffer()->GetSize());
EXPECT_EQ(0u, context.InputBuffer()->GetPosition());
}
TEST(CFX_GifContext, ReadAllOrNone) {
DataVector<uint8_t> dest_buffer;
uint8_t src_buffer[] = {0x00, 0x01, 0x02, 0x03, 0x04,
0x05, 0x06, 0x07, 0x08, 0x09};
CFX_GifContextForTest context;
context.SetTestInputBuffer({nullptr, 0});
EXPECT_FALSE(context.ReadAllOrNone(nullptr, 0));
EXPECT_FALSE(context.ReadAllOrNone(nullptr, 10));
EXPECT_FALSE(context.ReadAllOrNone(dest_buffer.data(), 0));
EXPECT_FALSE(context.ReadAllOrNone(dest_buffer.data(), 10));
context.SetTestInputBuffer({src_buffer, 0});
dest_buffer.resize(sizeof(src_buffer));
EXPECT_FALSE(context.ReadAllOrNone(dest_buffer.data(), sizeof(src_buffer)));
context.SetTestInputBuffer({src_buffer, 1});
EXPECT_FALSE(context.ReadAllOrNone(dest_buffer.data(), sizeof(src_buffer)));
EXPECT_EQ(0u, context.InputBuffer()->GetPosition());
EXPECT_FALSE(context.ReadAllOrNone(nullptr, sizeof(src_buffer)));
EXPECT_FALSE(context.ReadAllOrNone(nullptr, 1));
EXPECT_TRUE(context.ReadAllOrNone(dest_buffer.data(), 1));
EXPECT_EQ(src_buffer[0], dest_buffer[0]);
context.SetTestInputBuffer(src_buffer);
EXPECT_FALSE(context.ReadAllOrNone(nullptr, sizeof(src_buffer)));
EXPECT_TRUE(context.ReadAllOrNone(dest_buffer.data(), sizeof(src_buffer)));
for (size_t i = 0; i < sizeof(src_buffer); i++)
EXPECT_EQ(src_buffer[i], dest_buffer[i]);
context.SetTestInputBuffer(src_buffer);
for (size_t i = 0; i < sizeof(src_buffer); i++) {
EXPECT_TRUE(context.ReadAllOrNone(dest_buffer.data(), 1));
EXPECT_EQ(src_buffer[i], dest_buffer[0]);
}
}
TEST(CFX_GifContext, ReadGifSignature) {
CFX_GifContextForTest context;
{
uint8_t data[1];
context.SetTestInputBuffer({data, 0});
EXPECT_EQ(GifDecoder::Status::kUnfinished, context.ReadGifSignature());
EXPECT_EQ(0u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// Make sure testing the entire signature
{
uint8_t data[] = {'G', 'I', 'F'};
context.SetTestInputBuffer(data);
EXPECT_EQ(GifDecoder::Status::kUnfinished, context.ReadGifSignature());
EXPECT_EQ(0u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
{
uint8_t data[] = {'N', 'O', 'T', 'G', 'I', 'F'};
context.SetTestInputBuffer(data);
EXPECT_EQ(GifDecoder::Status::kError, context.ReadGifSignature());
EXPECT_EQ(6u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// Make sure not matching GIF8*a
{
uint8_t data[] = {'G', 'I', 'F', '8', '0', 'a'};
context.SetTestInputBuffer(data);
EXPECT_EQ(GifDecoder::Status::kError, context.ReadGifSignature());
EXPECT_EQ(6u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// Make sure not matching GIF**a
{
uint8_t data[] = {'G', 'I', 'F', '9', '2', 'a'};
context.SetTestInputBuffer(data);
EXPECT_EQ(GifDecoder::Status::kError, context.ReadGifSignature());
EXPECT_EQ(6u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// One valid signature
{
uint8_t data[] = {'G', 'I', 'F', '8', '7', 'a'};
context.SetTestInputBuffer(data);
EXPECT_EQ(GifDecoder::Status::kSuccess, context.ReadGifSignature());
EXPECT_EQ(6u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// The other valid signature
{
uint8_t data[] = {'G', 'I', 'F', '8', '9', 'a'};
context.SetTestInputBuffer(data);
EXPECT_EQ(GifDecoder::Status::kSuccess, context.ReadGifSignature());
EXPECT_EQ(6u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
}
TEST(CFX_GifContext, ReadLocalScreenDescriptor) {
CFX_GifContextForTest context;
{
uint8_t data[1];
context.SetTestInputBuffer({data, 0});
EXPECT_EQ(GifDecoder::Status::kUnfinished,
context.ReadLogicalScreenDescriptor());
context.SetTestInputBuffer({});
}
// LSD with all the values zero'd
{
uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
memset(&lsd, 0, sizeof(CFX_GifLocalScreenDescriptor));
context.SetTestInputBuffer(lsd);
EXPECT_EQ(GifDecoder::Status::kSuccess,
context.ReadLogicalScreenDescriptor());
EXPECT_EQ(sizeof(CFX_GifLocalScreenDescriptor),
static_cast<size_t>(context.InputBuffer()->GetPosition()));
EXPECT_EQ(0, context.width_);
EXPECT_EQ(0, context.height_);
EXPECT_EQ(0u, context.bc_index_);
context.SetTestInputBuffer({});
}
// LSD with no global palette
{
uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)] = {0x0A, 0x00, 0x00, 0x0F,
0x00, 0x01, 0x02};
context.SetTestInputBuffer(lsd);
EXPECT_EQ(GifDecoder::Status::kSuccess,
context.ReadLogicalScreenDescriptor());
EXPECT_EQ(sizeof(CFX_GifLocalScreenDescriptor),
static_cast<size_t>(context.InputBuffer()->GetPosition()));
EXPECT_EQ(0x000A, context.width_);
EXPECT_EQ(0x0F00, context.height_);
EXPECT_EQ(0u, context.bc_index_); // bc_index_ is 0 if no global palette
context.SetTestInputBuffer({});
}
// LSD with global palette bit set, but no global palette
{
uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)] = {0x0A, 0x00, 0x00, 0x0F,
0x80, 0x01, 0x02};
context.SetTestInputBuffer(lsd);
EXPECT_EQ(GifDecoder::Status::kUnfinished,
context.ReadLogicalScreenDescriptor());
EXPECT_EQ(0u, context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// LSD with global palette
{
struct {
uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
uint8_t palette[4 * sizeof(CFX_GifPalette)];
} data = {{0x0A, 0x00, 0x00, 0x0F, 0xA9, 0x01, 0x02},
{0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1}};
context.SetTestInputBuffer(
{reinterpret_cast<uint8_t*>(&data), sizeof(data)});
EXPECT_EQ(GifDecoder::Status::kSuccess,
context.ReadLogicalScreenDescriptor());
EXPECT_EQ(sizeof(data), context.InputBuffer()->GetPosition());
EXPECT_EQ(0x000A, context.width_);
EXPECT_EQ(0x0F00, context.height_);
EXPECT_EQ(1u, context.bc_index_);
EXPECT_EQ(1u, context.global_palette_exp_);
EXPECT_EQ(1, context.global_sort_flag_);
EXPECT_EQ(2, context.global_color_resolution_);
EXPECT_EQ(0, memcmp(data.palette, context.global_palette_.data(),
sizeof(data.palette)));
context.SetTestInputBuffer({});
}
}
TEST(CFX_GifContext, ReadHeader) {
CFX_GifContextForTest context;
// Bad signature
{
struct {
uint8_t signature[6];
uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
} data = {{'N', 'O', 'T', 'G', 'I', 'F'},
{0x0A, 0x00, 0x00, 0x0F, 0x00, 0x01, 0x02}};
context.SetTestInputBuffer(
{reinterpret_cast<uint8_t*>(&data), sizeof(data)});
EXPECT_EQ(GifDecoder::Status::kError, context.ReadHeader());
EXPECT_EQ(sizeof(data.signature), context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// Short after signature
{
uint8_t signature[] = {'G', 'I', 'F', '8', '7', 'a'};
context.SetTestInputBuffer(
{reinterpret_cast<uint8_t*>(&signature), sizeof(signature)});
EXPECT_EQ(GifDecoder::Status::kUnfinished, context.ReadHeader());
EXPECT_EQ(sizeof(signature), context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// Success without global palette
{
struct {
uint8_t signature[6];
uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
} data = {{'G', 'I', 'F', '8', '7', 'a'},
{0x0A, 0x00, 0x00, 0x0F, 0x00, 0x01, 0x02}};
context.SetTestInputBuffer(
{reinterpret_cast<uint8_t*>(&data), sizeof(data)});
EXPECT_EQ(GifDecoder::Status::kSuccess, context.ReadHeader());
EXPECT_EQ(sizeof(data), context.InputBuffer()->GetPosition());
EXPECT_EQ(0x000A, context.width_);
EXPECT_EQ(0x0F00, context.height_);
EXPECT_EQ(0u, context.bc_index_); // bc_index_ is 0 if no global palette
context.SetTestInputBuffer({});
}
// Missing Global Palette
{
struct {
uint8_t signature[6];
uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
} data = {{'G', 'I', 'F', '8', '7', 'a'},
{0x0A, 0x00, 0x00, 0x0F, 0x80, 0x01, 0x02}};
context.SetTestInputBuffer(
{reinterpret_cast<uint8_t*>(&data), sizeof(data)});
EXPECT_EQ(GifDecoder::Status::kUnfinished, context.ReadHeader());
EXPECT_EQ(sizeof(data.signature), context.InputBuffer()->GetPosition());
context.SetTestInputBuffer({});
}
// Success with global palette
{
struct {
uint8_t signature[6];
uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
uint8_t palette[4 * sizeof(CFX_GifPalette)];
} data = {{'G', 'I', 'F', '8', '7', 'a'},
{0x0A, 0x00, 0x00, 0x0F, 0xA9, 0x01, 0x02},
{0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1}};
context.SetTestInputBuffer(
{reinterpret_cast<uint8_t*>(&data), sizeof(data)});
EXPECT_EQ(GifDecoder::Status::kSuccess, context.ReadHeader());
EXPECT_EQ(sizeof(data), context.InputBuffer()->GetPosition());
EXPECT_EQ(0x000A, context.width_);
EXPECT_EQ(0x0F00, context.height_);
EXPECT_EQ(1u, context.bc_index_);
EXPECT_EQ(1u, context.global_palette_exp_);
EXPECT_EQ(1, context.global_sort_flag_);
EXPECT_EQ(2, context.global_color_resolution_);
EXPECT_EQ(0, memcmp(data.palette, context.global_palette_.data(),
sizeof(data.palette)));
context.SetTestInputBuffer({});
}
}
} // namespace fxcodec
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