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// Copyright 2016 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 <stdint.h>
#include <limits>
#include <memory>
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
#include "core/fxcodec/codec/ccodec_basicmodule.h"
#include "core/fxcodec/fx_codec.h"
#include "testing/gtest/include/gtest/gtest.h"
TEST(fxcodec, RLETestBadInputs) {
const uint8_t src_buf[] = {1};
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
// Error codes, not segvs, should callers pass us a nullptr pointer.
EXPECT_FALSE(pEncoders->RunLengthEncode(src_buf, &dest_buf, nullptr));
EXPECT_FALSE(pEncoders->RunLengthEncode(src_buf, nullptr, &dest_size));
EXPECT_FALSE(pEncoders->RunLengthEncode({}, &dest_buf, &dest_size));
}
// Check length 1 input works. Check terminating character is applied.
TEST(fxcodec, RLETestShortInput) {
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
const uint8_t src_buf[] = {1};
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
EXPECT_TRUE(pEncoders->RunLengthEncode(src_buf, &dest_buf, &dest_size));
ASSERT_EQ(3u, dest_size);
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
EXPECT_EQ(0, dest_buf_span[0]);
EXPECT_EQ(1, dest_buf_span[1]);
EXPECT_EQ(128, dest_buf_span[2]);
}
// Check a few basic cases (2 matching runs in a row, matching run followed
// by a non-matching run, and non-matching run followed by a matching run).
TEST(fxcodec, RLETestNormalInputs) {
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
std::unique_ptr<uint8_t, FxFreeDeleter> decoded_buf;
uint32_t decoded_size = 0;
{
// Case 1: Match, match
const uint8_t src_buf_1[] = {2, 2, 2, 2, 4, 4, 4, 4, 4, 4};
EXPECT_TRUE(pEncoders->RunLengthEncode(src_buf_1, &dest_buf, &dest_size));
RunLengthDecode({dest_buf.get(), dest_size}, &decoded_buf, &decoded_size);
ASSERT_EQ(sizeof(src_buf_1), decoded_size);
auto decoded_buf_span = pdfium::make_span(decoded_buf.get(), decoded_size);
for (uint32_t i = 0; i < decoded_size; i++)
EXPECT_EQ(src_buf_1[i], decoded_buf_span[i]) << " at " << i;
}
{
// Case 2: Match, non-match
const uint8_t src_buf_2[] = {2, 2, 2, 2, 1, 2, 3, 4, 5, 6};
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->RunLengthEncode(src_buf_2, &dest_buf, &dest_size));
decoded_buf.reset();
decoded_size = 0;
RunLengthDecode({dest_buf.get(), dest_size}, &decoded_buf, &decoded_size);
ASSERT_EQ(sizeof(src_buf_2), decoded_size);
auto decoded_buf_span = pdfium::make_span(decoded_buf.get(), decoded_size);
for (uint32_t i = 0; i < decoded_size; i++)
EXPECT_EQ(src_buf_2[i], decoded_buf_span[i]) << " at " << i;
}
{
// Case 3: Non-match, match
const uint8_t src_buf_3[] = {1, 2, 3, 4, 5, 3, 3, 3, 3, 3};
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->RunLengthEncode(src_buf_3, &dest_buf, &dest_size));
decoded_buf.reset();
decoded_size = 0;
RunLengthDecode({dest_buf.get(), dest_size}, &decoded_buf, &decoded_size);
ASSERT_EQ(sizeof(src_buf_3), decoded_size);
auto decoded_buf_span = pdfium::make_span(decoded_buf.get(), decoded_size);
for (uint32_t i = 0; i < decoded_size; i++)
EXPECT_EQ(src_buf_3[i], decoded_buf_span[i]) << " at " << i;
}
}
// Check that runs longer than 128 are broken up properly, both matched and
// non-matched.
TEST(fxcodec, RLETestFullLengthInputs) {
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
std::unique_ptr<uint8_t, FxFreeDeleter> decoded_buf;
uint32_t decoded_size = 0;
{
// Case 1: Match, match
const uint8_t src_buf_1[260] = {1};
EXPECT_TRUE(pEncoders->RunLengthEncode(src_buf_1, &dest_buf, &dest_size));
RunLengthDecode({dest_buf.get(), dest_size}, &decoded_buf, &decoded_size);
ASSERT_EQ(sizeof(src_buf_1), decoded_size);
auto decoded_buf_span = pdfium::make_span(decoded_buf.get(), decoded_size);
for (uint32_t i = 0; i < decoded_size; i++)
EXPECT_EQ(src_buf_1[i], decoded_buf_span[i]) << " at " << i;
}
{
// Case 2: Match, non-match
uint8_t src_buf_2[260] = {2};
for (uint16_t i = 128; i < 260; i++)
src_buf_2[i] = static_cast<uint8_t>(i - 125);
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->RunLengthEncode(src_buf_2, &dest_buf, &dest_size));
decoded_buf.reset();
decoded_size = 0;
RunLengthDecode({dest_buf.get(), dest_size}, &decoded_buf, &decoded_size);
ASSERT_EQ(sizeof(src_buf_2), decoded_size);
auto decoded_buf_span = pdfium::make_span(decoded_buf.get(), decoded_size);
for (uint32_t i = 0; i < decoded_size; i++)
EXPECT_EQ(src_buf_2[i], decoded_buf_span[i]) << " at " << i;
}
{
// Case 3: Non-match, match
uint8_t src_buf_3[260] = {3};
for (uint8_t i = 0; i < 128; i++)
src_buf_3[i] = i;
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->RunLengthEncode(src_buf_3, &dest_buf, &dest_size));
decoded_buf.reset();
decoded_size = 0;
RunLengthDecode({dest_buf.get(), dest_size}, &decoded_buf, &decoded_size);
ASSERT_EQ(sizeof(src_buf_3), decoded_size);
auto decoded_buf_span = pdfium::make_span(decoded_buf.get(), decoded_size);
for (uint32_t i = 0; i < decoded_size; i++)
EXPECT_EQ(src_buf_3[i], decoded_buf_span[i]) << " at " << i;
}
{
// Case 4: Non-match, non-match
uint8_t src_buf_4[260];
for (uint16_t i = 0; i < 260; i++)
src_buf_4[i] = static_cast<uint8_t>(i);
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->RunLengthEncode(src_buf_4, &dest_buf, &dest_size));
decoded_buf.reset();
decoded_size = 0;
RunLengthDecode({dest_buf.get(), dest_size}, &decoded_buf, &decoded_size);
ASSERT_EQ(sizeof(src_buf_4), decoded_size);
auto decoded_buf_span = pdfium::make_span(decoded_buf.get(), decoded_size);
for (uint32_t i = 0; i < decoded_size; i++)
EXPECT_EQ(src_buf_4[i], decoded_buf_span[i]) << " at " << i;
}
}
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