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/*
* Copyright (C) 2025 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2025 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-runtime-lib
* Created on: 13 мар. 2021 г.
*
* lsp-runtime-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-runtime-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-runtime-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_RESOURCE_BUFFER_H_
#define LSP_PLUG_IN_RESOURCE_BUFFER_H_
#include <lsp-plug.in/runtime/version.h>
#include <lsp-plug.in/common/types.h>
#include <lsp-plug.in/common/status.h>
namespace lsp
{
namespace resource
{
/**
* The maximum number of characters appended to the replay buffer
* if the character repeat at the tail is used.
*/
static const size_t REPEAT_BUF_MAX = 4;
/**
* Location in the buffer
*/
typedef struct location_t
{
ssize_t offset; // Offset relative to the buffer
size_t len; // Length of the block
size_t repeat; // Number of repeats
} location_t;
/**
* Compression buffer
*/
typedef struct cbuffer_t
{
public:
uint8_t *data; // Buffer data (2 x capacity)
uint32_t *index; // Index
uint32_t *root; // Root index
uint32_t head; // Head of the buffer
uint32_t length; // Buffer length
uint32_t cap; // Buffer capacity
public:
explicit cbuffer_t();
~cbuffer_t();
status_t init(size_t capacity);
void destroy();
public:
/**
* Append buffer to compression buffer
* @param src buffer to append
* @param count the length of the buffer to append
*/
void append(const void *src, size_t count);
/**
* Append single byte to compression buffer
* @param v byte to append
*/
void append(uint8_t v);
/**
* Lookup for byte sequence inside of the buffer
* @param out relative offset of the sub-sequence in the buffer to the last byte stored in the buffer
* @param src byte sequence to search inside of the buffer
* @param avail number of bytes available in the sequence
* @return the length of sub-sequence found in the buffer
*/
size_t lookup(size_t *out, const void *src, size_t avail);
/**
* Get byte relative to the last written byte
* @param offset offset relative to the last written byte
* @return byte
*/
uint8_t byte_at(size_t offset);
/**
* Cleanup state of the buffer
*/
void clear();
/**
* Get size of data currently stored in the buffer
* @return size of data currently stored in the buffer
*/
inline size_t size() const { return lsp_min(length, cap); }
} cbuffer_t;
/**
* Decompression buffer
*/
typedef struct dbuffer_t
{
public:
uint8_t *data; // Buffer data (2 x capacity)
uint32_t length; // Actual size of buffer
uint32_t head; // Head of the buffer
uint32_t cap; // Buffer capacity
public:
explicit dbuffer_t();
~dbuffer_t();
status_t init(size_t capacity);
void destroy();
public:
/**
* Extract data from buffer
* @param dst destination pointer to store result
* @param offset relative offset of the subsequence in the buffer to the last byte store in the buffer
* @param count number of bytes to extract
* @return status of operation (error on buffer underflow)
*/
status_t extract(void *dst, size_t offset, size_t count);
/**
* Append multiple bytes to the buffer
* @param src data to append to the buffer
* @param count number of bytes to append
*/
void append(const void *src, size_t count);
/**
* Append single byte to the buffer
* @param v byt to append
*/
void append(uint8_t v);
/**
* Clear buffer state
*/
void clear();
/**
* Get size of data currently stored in the buffer
* @return size of data currently stored in the buffer
*/
inline size_t size() const { return length; }
} duffer_t;
} /* namespace resource */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_RESOURCE_BUFFER_H_ */
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