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/*
* Copyright (C) 2022 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 "base128_output_stream.h"
#include <unistd.h>
#include <memory>
#include "io_exception.h"
namespace screensharing {
using namespace std;
Base128OutputStream::Base128OutputStream(int fd, size_t buffer_size)
: fd_(fd),
buffer_(new uint8_t[buffer_size]),
buffer_capacity_(buffer_size),
offset_(0),
data_end_(0) {
}
Base128OutputStream::~Base128OutputStream() {
close(fd_);
delete [] buffer_;
}
int Base128OutputStream::Close() {
Flush();
return close(fd_);
}
void Base128OutputStream::Flush() {
while (offset_ > 0) {
auto n = write(fd_, buffer_, offset_);
if (n < 0) {
if (errno == EBADFD || errno == EPIPE) {
throw EndOfFile();
}
throw IoException();
}
assert(n <= offset_); // By contract of the write function.
offset_ -= n;
if (offset_ > 0) {
memcpy(buffer_, buffer_ + n, offset_);
}
}
}
void Base128OutputStream::WriteByte(uint8_t byte) {
if (offset_ == buffer_capacity_) {
Flush();
}
buffer_[offset_++] = byte;
}
void Base128OutputStream::WriteBytes(const string& bytes) {
WriteInt32(bytes.size());
for (auto b : bytes) {
WriteByte(b);
}
}
void Base128OutputStream::WriteUInt16(uint16_t value) {
do {
uint8_t b = value & 0x7F;
value >>= 7;
if (value != 0) {
b |= 0x80;
}
WriteByte(b);
} while (value != 0);
}
void Base128OutputStream::WriteUInt32(uint32_t value) {
do {
uint8_t b = value & 0x7F;
value >>= 7;
if (value != 0) {
b |= 0x80;
}
WriteByte(b);
} while (value != 0);
}
void Base128OutputStream::WriteUInt64(uint64_t value) {
do {
uint8_t b = value & 0x7F;
value >>= 7;
if (value != 0) {
b |= 0x80;
}
WriteByte(b);
} while (value != 0);
}
void Base128OutputStream::WriteBool(bool value) {
WriteByte(value ? 1 : 0);
}
} // namespace screensharing
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