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/*
* Copyright (C) 2017 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 "io/FileInputStream.h"
#include <errno.h> // for errno
#include <fcntl.h> // for O_RDONLY
#include <unistd.h> // for read
#include "android-base/errors.h"
#include "android-base/file.h" // for O_BINARY
#include "android-base/macros.h"
#include "android-base/utf8.h"
using ::android::base::SystemErrorCodeToString;
namespace aapt {
namespace io {
FileInputStream::FileInputStream(const std::string& path, size_t buffer_capacity)
: FileInputStream(::android::base::utf8::open(path.c_str(), O_RDONLY | O_BINARY),
buffer_capacity) {
}
FileInputStream::FileInputStream(int fd, size_t buffer_capacity)
: fd_(fd),
buffer_capacity_(buffer_capacity),
buffer_offset_(0u),
buffer_size_(0u),
total_byte_count_(0u) {
if (fd_ == -1) {
error_ = SystemErrorCodeToString(errno);
} else {
buffer_.reset(new uint8_t[buffer_capacity_]);
}
}
bool FileInputStream::Next(const void** data, size_t* size) {
if (HadError()) {
return false;
}
// Deal with any remaining bytes after BackUp was called.
if (buffer_offset_ != buffer_size_) {
*data = buffer_.get() + buffer_offset_;
*size = buffer_size_ - buffer_offset_;
total_byte_count_ += buffer_size_ - buffer_offset_;
buffer_offset_ = buffer_size_;
return true;
}
ssize_t n = TEMP_FAILURE_RETRY(read(fd_, buffer_.get(), buffer_capacity_));
if (n < 0) {
error_ = SystemErrorCodeToString(errno);
fd_.reset();
return false;
}
buffer_size_ = static_cast<size_t>(n);
buffer_offset_ = buffer_size_;
total_byte_count_ += buffer_size_;
*data = buffer_.get();
*size = buffer_size_;
return buffer_size_ != 0u;
}
void FileInputStream::BackUp(size_t count) {
if (count > buffer_offset_) {
count = buffer_offset_;
}
buffer_offset_ -= count;
total_byte_count_ -= count;
}
size_t FileInputStream::ByteCount() const {
return total_byte_count_;
}
bool FileInputStream::HadError() const {
return !error_.empty();
}
std::string FileInputStream::GetError() const {
return error_;
}
} // namespace io
} // namespace aapt
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