file.h

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/*
 Copyright (c) 2010, Florian Reuter
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without 
 modification, are permitted provided that the following conditions 
 are met:
 
 * Redistributions of source code must retain the above copyright 
   notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright 
   notice, this list of conditions and the following disclaimer in 
   the documentation and/or other materials provided with the 
   distribution.
 * Neither the name of Florian Reuter nor the names of its contributors 
   may be used to endorse or promote products derived from this 
   software without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
 OF THE POSSIBILITY OF SUCH DAMAGE.
 
*/
#include <opc/config.h>

#ifndef OPC_FILE_H
#define OPC_FILE_H

#ifdef __cplusplus
extern "C" {
#endif    

#define OPC_FILE_READ  (1<<0)

#define OPC_FILE_WRITE (1<<1)

#define OPC_FILE_TRUNC  (1<<2)


    typedef enum OPC_FILESEEKMODE_ENUM {
        opcFileSeekSet = SEEK_SET,
        opcFileSeekCur = SEEK_CUR,
        opcFileSeekEnd = SEEK_END
    } opcFileSeekMode;

    typedef int opcFileReadCallback(void *iocontext, char *buffer, int len);

    typedef int opcFileWriteCallback(void *iocontext, const char *buffer, int len);

    typedef int opcFileCloseCallback(void *iocontext);

    typedef opc_ofs_t opcFileSeekCallback(void *iocontext, opc_ofs_t ofs);

    typedef int opcFileTrimCallback(void *iocontext, opc_ofs_t new_size);

    typedef int opcFileFlushCallback(void *iocontext);

    typedef struct OPC_FILERAWSTATE_STRUCT {
        opc_error_t err;
        opc_ofs_t   buf_pos; // current pos in file
    } opcFileRawState;

    typedef struct OPC_IO_STRUCT {
        opcFileReadCallback *_ioread;
        opcFileWriteCallback *_iowrite;
        opcFileCloseCallback *_ioclose;
        opcFileSeekCallback *_ioseek;
        opcFileTrimCallback *_iotrim;
        opcFileFlushCallback *_ioflush;
        void *iocontext;
        int flags;
        opcFileRawState state;
        opc_ofs_t file_size;
    } opcIO_t;

    opc_error_t opcFileInitIO(opcIO_t *io,
                              opcFileReadCallback *ioread,
                              opcFileWriteCallback *iowrite,
                              opcFileCloseCallback *ioclose,
                              opcFileSeekCallback *ioseek,
                              opcFileTrimCallback *iotrim,
                              opcFileFlushCallback *ioflush,
                              void *iocontext,
                              pofs_t file_size,
                              int flags);

    opc_error_t opcFileInitIOFile(opcIO_t *io, const xmlChar *filename, int flags);

    opc_error_t opcFileInitIOMemory(opcIO_t *io, const opc_uint8_t *data, opc_uint32_t data_len, int flags);

    opc_error_t opcFileCleanupIO(opcIO_t *io);

#ifdef __cplusplus
} /* extern "C" */
#endif    
        
#endif /* OPC_FILE_H */