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.
58 lines
1.6 KiB
58 lines
1.6 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/DecompressingStream.h"
|
|
|
|
#include "base/StreamSerializing.h"
|
|
#include "lz4.h"
|
|
|
|
#include <errno.h>
|
|
#include <cassert>
|
|
|
|
namespace android {
|
|
namespace base {
|
|
|
|
DecompressingStream::DecompressingStream(Stream& input)
|
|
: mLzStream(LZ4_createStreamDecode()) {
|
|
loadBuffer(&input, &mBuffer);
|
|
}
|
|
|
|
DecompressingStream::~DecompressingStream() {
|
|
LZ4_freeStreamDecode((LZ4_streamDecode_t*)mLzStream);
|
|
}
|
|
|
|
ssize_t DecompressingStream::read(void* buffer, size_t size) {
|
|
assert(mBufferPos < mBuffer.size() ||
|
|
(mBufferPos == mBuffer.size() && size == 0));
|
|
if (!size) {
|
|
return 0;
|
|
}
|
|
const int read = LZ4_decompress_fast_continue(
|
|
(LZ4_streamDecode_t*)mLzStream, mBuffer.data() + mBufferPos,
|
|
(char*)buffer, size);
|
|
if (!read) {
|
|
return -EIO;
|
|
}
|
|
mBufferPos += read;
|
|
assert(mBufferPos <= mBuffer.size());
|
|
return size;
|
|
}
|
|
|
|
ssize_t DecompressingStream::write(const void*, size_t) {
|
|
return -EPERM;
|
|
}
|
|
|
|
} // namespace base
|
|
} // namespace android
|