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// Copyright 2008 Google Inc.
// Author: Lincoln Smith
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <config.h>
#include "google/vcdecoder.h"
#include <string>
#include "codetable.h"
#include "testing.h"
#include "vcdecoder_test.h"
namespace open_vcdiff {
namespace {
// Decode an encoding that uses a RUN instruction to allocate 64MB.
class VCDiffLargeTargetTest : public VCDiffDecoderTest {
protected:
VCDiffLargeTargetTest();
virtual ~VCDiffLargeTargetTest() {}
static const char kLargeRunWindow[];
};
const char VCDiffLargeTargetTest::kLargeRunWindow[] = {
0x00, // Win_Indicator: no source segment
0x0E, // Length of the delta encoding
0xA0, // Size of the target window (0x4000000)
0x80, // Size of the target window cont'd
0x80, // Size of the target window cont'd
0x00, // Size of the target window cont'd
0x00, // Delta_indicator (no compression)
0x00, // length of data for ADDs and RUNs
0x06, // length of instructions section
0x00, // length of addresses for COPYs
// Interleaved segment
0x00, // VCD_RUN size 0
0xA0, // Size of RUN (0x4000000)
0x80, // Size of RUN cont'd
0x80, // Size of RUN cont'd
0x00, // Size of RUN cont'd
0xBE, // Data for RUN
};
VCDiffLargeTargetTest::VCDiffLargeTargetTest() {
UseInterleavedFileHeader();
}
// Ensure that, with allow_vcd_target set to false, we can decode any number of
// 64MB windows without running out of memory.
TEST_F(VCDiffLargeTargetTest, Decode) {
// 50 x 64MB = 3.2GB, which should be too large if memory usage accumulates
// during each iteration.
const int kIterations = 50;
decoder_.SetAllowVcdTarget(false);
decoder_.SetMaximumTargetFileSize(0x4000000UL * 50);
decoder_.StartDecoding(dictionary_.data(), dictionary_.size());
EXPECT_TRUE(decoder_.DecodeChunk(delta_file_header_.data(),
delta_file_header_.size(),
&output_));
EXPECT_EQ("", output_);
for (int i = 0; i < kIterations; i++) {
EXPECT_TRUE(decoder_.DecodeChunk(kLargeRunWindow, sizeof(kLargeRunWindow),
&output_));
EXPECT_EQ(0x4000000U, output_.size());
EXPECT_EQ(static_cast<char>(0xBE), output_[0]);
EXPECT_EQ(static_cast<char>(0xBE),
output_[output_.size() / 2]); // middle element
EXPECT_EQ(static_cast<char>(0xBE),
output_[output_.size() - 1]); // last element
output_.clear();
}
EXPECT_TRUE(decoder_.FinishDecoding());
}
// If we don't increase the maximum target file size first, the same test should
// produce an error.
TEST_F(VCDiffLargeTargetTest, DecodeReachesMaxFileSize) {
decoder_.SetAllowVcdTarget(false);
decoder_.StartDecoding(dictionary_.data(), dictionary_.size());
EXPECT_TRUE(decoder_.DecodeChunk(delta_file_header_.data(),
delta_file_header_.size(),
&output_));
EXPECT_EQ("", output_);
// The default maximum target file size is 64MB, which just matches the target
// data produced by a single iteration.
EXPECT_TRUE(decoder_.DecodeChunk(kLargeRunWindow, sizeof(kLargeRunWindow),
&output_));
EXPECT_EQ(0x4000000U, output_.size());
EXPECT_EQ(static_cast<char>(0xBE), output_[0]);
EXPECT_EQ(static_cast<char>(0xBE),
output_[output_.size() / 2]); // middle element
EXPECT_EQ(static_cast<char>(0xBE),
output_[output_.size() - 1]); // last element
output_.clear();
// Trying to decode a second window should exceed the target file size limit.
EXPECT_FALSE(decoder_.DecodeChunk(kLargeRunWindow, sizeof(kLargeRunWindow),
&output_));
}
} // unnamed namespace
} // namespace open_vcdiff
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