You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.7 KiB
57 lines
1.7 KiB
// Copyright 2020 The Android Open Source Project
|
|
//
|
|
// 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 "base/CompressingStream.h"
|
|
|
|
#include "base/StreamSerializing.h"
|
|
#include "lz4.h"
|
|
|
|
#include <errno.h>
|
|
|
|
namespace android {
|
|
namespace base {
|
|
|
|
CompressingStream::CompressingStream(Stream& output)
|
|
: mOutput(output), mLzStream(LZ4_createStream()) {}
|
|
|
|
CompressingStream::~CompressingStream() {
|
|
saveBuffer(&mOutput, mBuffer);
|
|
LZ4_freeStream((LZ4_stream_t*)mLzStream);
|
|
}
|
|
|
|
ssize_t CompressingStream::read(void*, size_t) {
|
|
return -EPERM;
|
|
}
|
|
|
|
ssize_t CompressingStream::write(const void* buffer, size_t size) {
|
|
if (!size) {
|
|
return 0;
|
|
}
|
|
const auto outSize = LZ4_compressBound(size);
|
|
auto oldSize = mBuffer.size();
|
|
mBuffer.resize_noinit(mBuffer.size() + outSize);
|
|
const auto outBuffer = mBuffer.data() + oldSize;
|
|
const int written = LZ4_compress_fast_continue((LZ4_stream_t*)mLzStream,
|
|
(const char*)buffer,
|
|
outBuffer, size, outSize, 1);
|
|
if (!written) {
|
|
return -EIO;
|
|
}
|
|
mBuffer.resize(oldSize + written);
|
|
return size;
|
|
}
|
|
|
|
} // namespace base
|
|
} // namespace android
|