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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* byte_stream_buffer.h - Byte stream buffer
*/
#ifndef __LIBCAMERA_BYTE_STREAM_BUFFER_H__
#define __LIBCAMERA_BYTE_STREAM_BUFFER_H__
#include <stddef.h>
#include <stdint.h>
#include <type_traits>
#include <libcamera/span.h>
namespace libcamera {
class ByteStreamBuffer
{
public:
ByteStreamBuffer(const uint8_t *base, size_t size);
ByteStreamBuffer(uint8_t *base, size_t size);
ByteStreamBuffer(ByteStreamBuffer &&other);
ByteStreamBuffer &operator=(ByteStreamBuffer &&other);
const uint8_t *base() const { return base_; }
uint32_t offset() const { return (write_ ? write_ : read_) - base_; }
size_t size() const { return size_; }
bool overflow() const { return overflow_; }
ByteStreamBuffer carveOut(size_t size);
int skip(size_t size);
template<typename T>
int read(T *t)
{
return read(reinterpret_cast<uint8_t *>(t), sizeof(*t));
}
template<typename T>
int read(const Span<T> &data)
{
return read(reinterpret_cast<uint8_t *>(data.data()),
data.size_bytes());
}
template<typename T>
const std::remove_reference_t<T> *read(size_t count = 1)
{
using return_type = const std::remove_reference_t<T> *;
return reinterpret_cast<return_type>(read(sizeof(T), count));
}
template<typename T>
int write(const T *t)
{
return write(reinterpret_cast<const uint8_t *>(t), sizeof(*t));
}
template<typename T>
int write(const Span<T> &data)
{
return write(reinterpret_cast<const uint8_t *>(data.data()),
data.size_bytes());
}
private:
ByteStreamBuffer(const ByteStreamBuffer &other) = delete;
ByteStreamBuffer &operator=(const ByteStreamBuffer &other) = delete;
void setOverflow();
int read(uint8_t *data, size_t size);
const uint8_t *read(size_t size, size_t count);
int write(const uint8_t *data, size_t size);
ByteStreamBuffer *parent_;
const uint8_t *base_;
size_t size_;
bool overflow_;
const uint8_t *read_;
uint8_t *write_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_BYTE_STREAM_BUFFER_H__ */
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