69bb53aca1
The ByteStreamBuffer class wraps a memory area, expected to be allocated by the user of the class and provides operations to perform sequential access in read and write modes. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
64 lines
1.4 KiB
C++
64 lines
1.4 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* byte_stream_buffer.h - Byte stream buffer
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*/
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#ifndef __LIBCAMERA_BYTE_STREAM_BUFFER_H__
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#define __LIBCAMERA_BYTE_STREAM_BUFFER_H__
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#include <stddef.h>
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#include <stdint.h>
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namespace libcamera {
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class ByteStreamBuffer
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{
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public:
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ByteStreamBuffer(const uint8_t *base, size_t size);
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ByteStreamBuffer(uint8_t *base, size_t size);
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ByteStreamBuffer(ByteStreamBuffer &&other);
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ByteStreamBuffer &operator=(ByteStreamBuffer &&other);
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const uint8_t *base() const { return base_; }
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uint32_t offset() const { return (write_ ? write_ : read_) - base_; }
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size_t size() const { return size_; }
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bool overflow() const { return overflow_; }
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ByteStreamBuffer carveOut(size_t size);
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int skip(size_t size);
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template<typename T>
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int read(T *t)
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{
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return read(reinterpret_cast<uint8_t *>(t), sizeof(*t));
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}
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template<typename T>
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int write(const T *t)
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{
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return write(reinterpret_cast<const uint8_t *>(t), sizeof(*t));
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}
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private:
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ByteStreamBuffer(const ByteStreamBuffer &other) = delete;
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ByteStreamBuffer &operator=(const ByteStreamBuffer &other) = delete;
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void setOverflow();
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int read(uint8_t *data, size_t size);
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int write(const uint8_t *data, size_t size);
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ByteStreamBuffer *parent_;
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const uint8_t *base_;
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size_t size_;
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bool overflow_;
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const uint8_t *read_;
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uint8_t *write_;
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};
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_BYTE_STREAM_BUFFER_H__ */
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