#include "image_io/base/byte_buffer.h"
|
|
#include <utility>
|
|
namespace photos_editing_formats {
|
namespace image_io {
|
|
using std::string;
|
using std::unique_ptr;
|
|
/// @param byte_data The byte data to write to the buffer at pos.
|
/// @param pos The location in a buffer to write the byte data to.
|
/// @return The number of bytes written to the buffer at pos.
|
static size_t WriteBytes(const ByteData& byte_data, Byte* pos) {
|
size_t byte_count = byte_data.GetByteCount();
|
if (!byte_count) {
|
return 0;
|
}
|
if (byte_data.GetType() == ByteData::kHex) {
|
const string& value = byte_data.GetValue();
|
for (size_t index = 0; index < byte_count; ++index) {
|
if (!ByteData::Hex2Byte(value[2 * index], value[2 * index + 1], pos++)) {
|
return 0;
|
}
|
}
|
} else {
|
memcpy(pos, byte_data.GetValue().c_str(), byte_count);
|
}
|
return byte_count;
|
}
|
|
ByteBuffer::ByteBuffer(size_t size, std::unique_ptr<Byte[]> buffer)
|
: buffer_(std::move(buffer)), size_(size) {
|
if (!buffer_) {
|
size_ = 0;
|
}
|
if (!size_) {
|
buffer_.reset();
|
}
|
}
|
|
ByteBuffer::ByteBuffer(const std::vector<ByteData>& byte_data_vector) {
|
size_ = 0;
|
for (const auto& byte_data : byte_data_vector) {
|
size_ += byte_data.GetByteCount();
|
}
|
if (!size_) {
|
return;
|
}
|
// Note that within google3, std::make_unique is not available, and clangtidy
|
// says use absl::make_unique. This library attempts to minimize the number of
|
// dependencies on google3, hence the no lint on the next line.
|
buffer_.reset(new Byte[size_]); // NOLINT
|
Byte* pos = buffer_.get();
|
for (const auto& byte_data : byte_data_vector) {
|
size_t bytes_written = WriteBytes(byte_data, pos);
|
if (bytes_written == 0 && byte_data.GetByteCount() != 0) {
|
size_ = 0;
|
buffer_.reset(nullptr);
|
}
|
pos += bytes_written;
|
}
|
}
|
|
bool ByteBuffer::SetBigEndianValue(size_t location, std::uint16_t value) {
|
if (location + 1 >= size_) {
|
return false;
|
}
|
buffer_[location] = static_cast<Byte>(value >> 8);
|
buffer_[location + 1] = static_cast<Byte>(value & 0xFF);
|
return true;
|
}
|
|
Byte* ByteBuffer::Release() {
|
size_ = 0;
|
return buffer_.release();
|
}
|
|
} // namespace image_io
|
} // namespace photos_editing_formats
|
