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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-runtime-lib
* Created on: 14 янв. 2018 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_FMT_LSPC_CHUNKACCESSOR_H_
#define LSP_PLUG_IN_FMT_LSPC_CHUNKACCESSOR_H_
#include <lsp-plug.in/runtime/version.h>
#include <lsp-plug.in/common/types.h>
#include <lsp-plug.in/common/status.h>
#include <lsp-plug.in/fmt/lspc/lspc.h>
#include <lsp-plug.in/stdlib/stdio.h>
namespace lsp
{
namespace lspc
{
typedef struct Resource
{
fhandle_t fd; // File handle
size_t refs; // Number of references
size_t bufsize; // Default buffer size
uint32_t chunk_id; // Chunk identifier allocator
wsize_t length; // Length of the output file
status_t acquire();
status_t release();
status_t allocate(uint32_t *id);
status_t write(const void *buf, size_t count);
ssize_t read(wsize_t pos, void *buf, size_t count);
} Resource;
class ChunkAccessor
{
private:
ChunkAccessor & operator = (const ChunkAccessor &);
protected:
friend class File;
protected:
enum const_t
{
MIN_BUF_SIZE = 0x1000
};
protected:
uint8_t *pBuffer; // Pointer to the buffer
size_t nBufSize; // Size of the buffer
size_t nBufPos; // Current buffer position
Resource *pFile; // Pointer to the shared file resource
uint32_t nMagic; // Magic number as size of chunk
status_t nErrorCode; // Last error code
chunk_id_t nUID; // Unique chunk identifier
protected:
inline status_t set_error(status_t err) { return nErrorCode = err; }
status_t do_close();
protected:
explicit ChunkAccessor(Resource *fd, uint32_t magic);
public:
virtual ~ChunkAccessor();
public:
inline size_t buffer_size() const { return nBufSize; }
inline status_t last_error() const { return nErrorCode; }
inline chunk_id_t unique_id() const { return nUID; }
inline uint32_t magic() const { return nMagic; }
public:
/** Close chunk accessor
*
* @return status of operation
*/
virtual status_t close();
};
}
} /* namespace lsp */
#endif /* LSP_PLUG_IN_FMT_LSPC_CHUNKACCESSOR_H_ */
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