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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_CHUNKREADER_H_
#define LSP_PLUG_IN_FMT_LSPC_CHUNKREADER_H_
#include <lsp-plug.in/runtime/version.h>
#include <lsp-plug.in/fmt/lspc/ChunkAccessor.h>
#include <lsp-plug.in/fmt/lspc/ChunkReaderStream.h>
namespace lsp
{
namespace lspc
{
class ChunkReader: public ChunkAccessor
{
private:
ChunkReader & operator = (const ChunkReader &);
protected:
friend class File;
protected:
uint32_t nUnread; // Number of bytes still not read from chunk
size_t nBufTail; // Buffer tail
wsize_t nFileOff; // File read offset
wssize_t nPosition; // Actual read position
bool bLast; // Indicator of the last chunk
ChunkReaderStream sStream; // The stream interface
protected:
explicit ChunkReader(Resource *fd, uint32_t magic, uint32_t uid);
public:
virtual ~ChunkReader();
public:
/**
* Obtain access to chunk reader as a stream.
* @return pointer to the stream
*/
inline io::IInStream *stream() { return &sStream; }
/**
* Get current read position in bytes
* @return actual position from the beginning of the chunk including header
*/
inline wssize_t position() const { return nPosition; }
public:
/**
* Read chunk data header from LSPC chunk. Header should contain lspc_header_t at
* the beginning.
* @param hdr the header data to store
* @param size the size of header, should be at least sizeof(lspc_header_t)
* @return status of operation or error code (negative)
*/
virtual ssize_t read_header(void *hdr, size_t size);
/**
* Read regular data from LSPC chunk.
* @param buf the pointer to store data
* @param count number of bytes to read
* @return number of bytes read or error code (negative)
*/
virtual ssize_t read(void *buf, size_t count);
/**
* Skip some amount of data
* @param count amount of bytes to skip
* @return number of skipped bytes or error code (negative)
*/
virtual ssize_t skip(size_t count);
};
}
} /* namespace lsp */
#endif /* LSP_PLUG_IN_FMT_LSPC_CHUNKREADER_H_ */
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