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/*
* Copyright (C) 2019 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 <sstream>
#include <string>
#include <thread>
#include <vector>
#include "common/libs/fs/shared_buf.h"
#include "common/libs/fs/shared_fd.h"
namespace cvd {
namespace {
const size_t BUFF_SIZE = 1 << 14;
} // namespace
ssize_t ReadAll(SharedFD fd, std::string* buf) {
char buff[BUFF_SIZE];
std::stringstream ss;
ssize_t read;
while ((read = fd->Read(buff, BUFF_SIZE - 1)) > 0) {
// this is necessary to avoid problems with having a '\0' in the middle of the buffer
ss << std::string(buff, read);
}
if (read < 0) {
errno = fd->GetErrno();
return read;
}
*buf = ss.str();
return buf->size();
}
ssize_t ReadExact(SharedFD fd, std::string* buf) {
size_t total_read = 0;
ssize_t read = 0;
while ((read = fd->Read((void*)&((*buf)[total_read]), buf->size() - total_read)) > 0) {
if (read < 0) {
errno = fd->GetErrno();
return read;
}
total_read += read;
if (total_read == buf->size()) {
break;
}
}
return total_read;
}
ssize_t WriteAll(SharedFD fd, const std::string& buf) {
size_t total_written = 0;
ssize_t written = 0;
while ((written = fd->Write((void*)&(buf[total_written]), buf.size() - total_written)) > 0) {
if (written < 0) {
errno = fd->GetErrno();
return written;
}
total_written += written;
if (total_written == buf.size()) {
break;
}
}
return total_written;
}
} // namespace cvd
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