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/*
* Copyright (C) 2013 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 "vector_output_stream.h"
#include <string.h>
#include "base/logging.h"
namespace art {
VectorOutputStream::VectorOutputStream(const std::string& location, std::vector<uint8_t>& vector)
: OutputStream(location), offset_(vector.size()), vector_(vector) {}
bool VectorOutputStream::WriteFully(const void* buffer, int64_t byte_count) {
off_t new_offset = offset_ + byte_count;
EnsureCapacity(new_offset);
memcpy(&vector_[offset_], buffer, byte_count);
offset_ = new_offset;
return true;
}
off_t VectorOutputStream::Seek(off_t offset, Whence whence) {
CHECK(whence == kSeekSet || whence == kSeekCurrent || whence == kSeekEnd) << whence;
off_t new_offset = 0;
switch (whence) {
case kSeekSet: {
new_offset = offset;
break;
}
case kSeekCurrent: {
new_offset = offset_ + offset;
break;
}
case kSeekEnd: {
new_offset = vector_.size() + offset;
break;
}
}
EnsureCapacity(new_offset);
offset_ = new_offset;
return offset_;
}
void VectorOutputStream::EnsureCapacity(off_t new_offset) {
if (new_offset > static_cast<off_t>(vector_.size())) {
vector_.resize(new_offset);
}
}
} // namespace art
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