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// Copyright 2017 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 "core/fxcodec/gif/cfx_lzwdecompressor.h"
#include "core/fxcrt/fx_memory.h"
#include "testing/gtest/include/gtest/gtest.h"
TEST(CFX_LZWDecompressor, CreateBadParams) {
EXPECT_EQ(nullptr, CFX_LZWDecompressor::Create(0x10, 0x02));
EXPECT_EQ(nullptr, CFX_LZWDecompressor::Create(0x04, 0x0F));
EXPECT_EQ(nullptr, CFX_LZWDecompressor::Create(0x02, 0x02));
}
TEST(CFX_LZWDecompressor, ExtractData) {
uint8_t palette_exp = 0x1;
uint8_t code_exp = 0x2;
auto decompressor = CFX_LZWDecompressor::Create(palette_exp, code_exp);
ASSERT_NE(nullptr, decompressor);
// Check that 0 length extract does nothing
{
std::vector<uint8_t>* decompressed = decompressor->DecompressedForTest();
*decompressed = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
*(decompressor->DecompressedNextForTest()) = decompressed->size();
uint8_t des_buf[20];
memset(des_buf, static_cast<uint8_t>(-1), sizeof(des_buf));
EXPECT_EQ(0u, decompressor->ExtractDataForTest(des_buf, 0));
for (size_t i = 0; i < FX_ArraySize(des_buf); ++i)
EXPECT_EQ(static_cast<uint8_t>(-1), des_buf[i]);
EXPECT_EQ(10u, *(decompressor->DecompressedNextForTest()));
for (size_t i = 0; i < *(decompressor->DecompressedNextForTest()); ++i)
EXPECT_EQ(i, decompressed->operator[](i));
}
// Check that less than decompressed size only gets the expected number
{
std::vector<uint8_t>* decompressed = decompressor->DecompressedForTest();
*decompressed = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
*(decompressor->DecompressedNextForTest()) = decompressed->size();
uint8_t des_buf[20];
memset(des_buf, static_cast<uint8_t>(-1), sizeof(des_buf));
EXPECT_EQ(5u, decompressor->ExtractDataForTest(des_buf, 5));
size_t i = 0;
for (; i < 5; ++i)
EXPECT_EQ(9 - i, des_buf[i]);
for (; i < FX_ArraySize(des_buf); ++i)
EXPECT_EQ(static_cast<uint8_t>(-1), des_buf[i]);
EXPECT_EQ(5u, *(decompressor->DecompressedNextForTest()));
for (i = 0; i < *(decompressor->DecompressedNextForTest()); ++i)
EXPECT_EQ(i, decompressed->operator[](i));
}
// Check that greater than decompressed size depletes the decompressor
{
std::vector<uint8_t>* decompressed = decompressor->DecompressedForTest();
*decompressed = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
*(decompressor->DecompressedNextForTest()) = decompressed->size();
uint8_t des_buf[20];
memset(des_buf, static_cast<uint8_t>(-1), sizeof(des_buf));
EXPECT_EQ(10u,
decompressor->ExtractDataForTest(des_buf, FX_ArraySize(des_buf)));
size_t i = 0;
for (; i < 10; ++i)
EXPECT_EQ(9 - i, des_buf[i]);
for (; i < FX_ArraySize(des_buf); ++i)
EXPECT_EQ(static_cast<uint8_t>(-1), des_buf[i]);
EXPECT_EQ(0u, *(decompressor->DecompressedNextForTest()));
}
}
TEST(CFX_LZWDecompressor, DecodeBadParams) {
uint8_t palette_exp = 0x0;
uint8_t code_exp = 0x2;
auto decompressor = CFX_LZWDecompressor::Create(palette_exp, code_exp);
ASSERT_NE(nullptr, decompressor);
uint8_t image_data[10];
uint32_t image_size = FX_ArraySize(image_data);
uint8_t output_data[10];
uint32_t output_size = FX_ArraySize(output_data);
EXPECT_EQ(
CFX_GifDecodeStatus::Error,
decompressor->Decode(nullptr, image_size, output_data, &output_size));
EXPECT_EQ(CFX_GifDecodeStatus::Error,
decompressor->Decode(image_data, 0, output_data, &output_size));
EXPECT_EQ(
CFX_GifDecodeStatus::Error,
decompressor->Decode(image_data, image_size, nullptr, &output_size));
EXPECT_EQ(CFX_GifDecodeStatus::Error,
decompressor->Decode(image_data, image_size, output_data, nullptr));
output_size = 0;
EXPECT_EQ(
CFX_GifDecodeStatus::InsufficientDestSize,
decompressor->Decode(image_data, image_size, output_data, &output_size));
}
TEST(CFX_LZWDecompressor, Decode1x1SingleColour) {
uint8_t palette_exp = 0x0;
uint8_t code_exp = 0x2;
auto decompressor = CFX_LZWDecompressor::Create(palette_exp, code_exp);
ASSERT_NE(nullptr, decompressor);
uint8_t image_data[] = {0x44, 0x01};
uint32_t image_size = FX_ArraySize(image_data);
uint8_t expected_data[] = {0x00};
uint8_t output_data[FX_ArraySize(expected_data)];
memset(output_data, 0, sizeof(output_data));
uint32_t output_size = FX_ArraySize(output_data);
EXPECT_EQ(
CFX_GifDecodeStatus::Success,
decompressor->Decode(image_data, image_size, output_data, &output_size));
EXPECT_EQ(FX_ArraySize(output_data), output_size);
EXPECT_TRUE(0 == memcmp(expected_data, output_data, sizeof(expected_data)));
}
TEST(CFX_LZWDecompressor, Decode10x10SingleColour) {
uint8_t palette_exp = 0x0;
uint8_t code_exp = 0x2;
auto decompressor = CFX_LZWDecompressor::Create(palette_exp, code_exp);
ASSERT_NE(nullptr, decompressor);
uint8_t image_data[] = {0x84, 0x8F, 0xA9, 0xCB, 0xED, 0x0F, 0x63, 0x2B};
uint32_t image_size = FX_ArraySize(image_data);
uint8_t expected_data[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
uint8_t output_data[FX_ArraySize(expected_data)];
memset(output_data, 0, sizeof(output_data));
uint32_t output_size = FX_ArraySize(output_data);
EXPECT_EQ(
CFX_GifDecodeStatus::Success,
decompressor->Decode(image_data, image_size, output_data, &output_size));
EXPECT_EQ(FX_ArraySize(output_data), output_size);
EXPECT_TRUE(0 == memcmp(expected_data, output_data, sizeof(expected_data)));
}
TEST(CFX_LZWDecompressor, Decode10x10MultipleColour) {
uint8_t palette_exp = 0x1;
uint8_t code_exp = 0x2;
auto decompressor = CFX_LZWDecompressor::Create(palette_exp, code_exp);
ASSERT_NE(nullptr, decompressor);
uint8_t image_data[] = {0x8C, 0x2D, 0x99, 0x87, 0x2A, 0x1C, 0xDC, 0x33,
0xA0, 0x02, 0x75, 0xEC, 0x95, 0xFA, 0xA8, 0xDE,
0x60, 0x8C, 0x04, 0x91, 0x4C, 0x01};
uint32_t image_size = FX_ArraySize(image_data);
uint8_t expected_data[] = {
0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02,
0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02,
0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02,
0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0x02, 0x02,
0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01};
uint8_t output_data[FX_ArraySize(expected_data)];
memset(output_data, 0, sizeof(output_data));
uint32_t output_size = FX_ArraySize(output_data);
EXPECT_EQ(
CFX_GifDecodeStatus::Success,
decompressor->Decode(image_data, image_size, output_data, &output_size));
EXPECT_EQ(FX_ArraySize(output_data), output_size);
EXPECT_TRUE(0 == memcmp(expected_data, output_data, sizeof(expected_data)));
}
TEST(CFX_LZWDecompressor, HandleColourCodeOutOfPalette) {
uint8_t palette_exp = 0x2; // Image uses 10 colours, so the palette exp
// should be 3, 2^(3+1) = 16 colours.
uint8_t code_exp = 0x4;
auto decompressor = CFX_LZWDecompressor::Create(palette_exp, code_exp);
ASSERT_NE(nullptr, decompressor);
uint8_t image_data[] = {0x30, 0xC9, 0x49, 0x81, 0xBD, 0x78, 0xE8, 0xCD,
0x89, 0xFF, 0x60, 0x20, 0x8E, 0xE4, 0x61, 0x9E,
0xA8, 0xA1, 0xAE, 0x2C, 0xE2, 0xBE, 0xB0, 0x20,
0xCF, 0x74, 0x61, 0xDF, 0x78, 0x04};
uint32_t image_size = FX_ArraySize(image_data);
uint8_t output_data[100]; // The uncompressed data is for a 10x10 image
memset(output_data, 0, sizeof(output_data));
uint32_t output_size = FX_ArraySize(output_data);
EXPECT_EQ(
CFX_GifDecodeStatus::Error,
decompressor->Decode(image_data, image_size, output_data, &output_size));
}
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