1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "buffered_output_stream.h"
18
19 #include <string.h>
20
21 namespace art {
22 namespace linker {
23
BufferedOutputStream(std::unique_ptr<OutputStream> out)24 BufferedOutputStream::BufferedOutputStream(std::unique_ptr<OutputStream> out)
25 : OutputStream(out->GetLocation()), // Before out is moved to out_.
26 out_(std::move(out)),
27 used_(0) {}
28
~BufferedOutputStream()29 BufferedOutputStream::~BufferedOutputStream() {
30 FlushBuffer();
31 }
32
WriteFully(const void * buffer,size_t byte_count)33 bool BufferedOutputStream::WriteFully(const void* buffer, size_t byte_count) {
34 if (byte_count > kBufferSize) {
35 if (!FlushBuffer()) {
36 return false;
37 }
38 return out_->WriteFully(buffer, byte_count);
39 }
40 if (used_ + byte_count > kBufferSize) {
41 if (!FlushBuffer()) {
42 return false;
43 }
44 }
45 const uint8_t* src = reinterpret_cast<const uint8_t*>(buffer);
46 memcpy(&buffer_[used_], src, byte_count);
47 used_ += byte_count;
48 return true;
49 }
50
Flush()51 bool BufferedOutputStream::Flush() {
52 return FlushBuffer() && out_->Flush();
53 }
54
FlushBuffer()55 bool BufferedOutputStream::FlushBuffer() {
56 bool success = true;
57 if (used_ > 0) {
58 success = out_->WriteFully(&buffer_[0], used_);
59 used_ = 0;
60 }
61 return success;
62 }
63
Seek(off_t offset,Whence whence)64 off_t BufferedOutputStream::Seek(off_t offset, Whence whence) {
65 if (!FlushBuffer()) {
66 return -1;
67 }
68 return out_->Seek(offset, whence);
69 }
70
71 } // namespace linker
72 } // namespace art
73