objio.h

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C头文件 代码 · 共 95 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#ifndef OBJIO_H
#define OBJIO_H 1
#include <stddef.h>
#include <watcom.h>
#include "objrec.h"

typedef struct objread_buf objread_buf;
struct objread_buf {
    objread_buf *next;      /* next buffer in stack                         */
    size_t      in_buf;     /* amount of data in this buffer                */
    uint_8      data[1];    /* data for buffer (objrecs point into here)    */
};

typedef struct {
    int         fh;         /* file handle                                  */
    objread_buf *bufs;      /* stack of buffers of data for this file       */
    size_t      cur_off;    /* offset into top buf in bufs                  */
} OBJ_RFILE;

typedef struct {
    int         fh;         /* file handle                                  */
    uint_16     length;     /* number of bytes written since rec header     */
    size_t      in_buf;     /* number of bytes in buffer                    */
    uint_8      checksum;   /* for current record                           */
    uint_8      in_rec : 1; /* a record is open                             */
    char        buffer[1];  /* for writing                                  */
} OBJ_WFILE;

typedef struct {
    long        rec_begin;
    uint_16     offset;
} obj_offset;

#define OBJ_BUFFER_SIZE 0x1000      /* 4k (must be less than 64k) */
#define OBJ_MAX_REC     0x1000      /* maximum record size (<64k) */

#if OBJ_MAX_REC > OBJ_BUFFER_SIZE
#error "OBJ_MAX_REC must be smaller than OBJ_BUFFER_SIZE"
#endif

extern OBJ_RFILE    *ObjReadOpen( const char *filename );
extern void         ObjReadClose( OBJ_RFILE *obj );
extern obj_rec      *ObjReadRec( OBJ_RFILE *obj );
extern int          ObjRMoreData( OBJ_RFILE *obj );
extern void         ObjRSkipPage( OBJ_RFILE *obj, size_t page_len );

extern OBJ_WFILE    *ObjWriteOpen( const char *filename );
extern void         ObjWriteClose( OBJ_WFILE *obj );
extern void         ObjWBegRec( OBJ_WFILE *obj, uint_8 command );
extern void         ObjWEndRec( OBJ_WFILE *obj );
extern void         ObjWrite8( OBJ_WFILE *obj, uint_8 byte );
extern void         ObjWrite16( OBJ_WFILE *obj, uint_16 word );
extern void         ObjWrite32( OBJ_WFILE *obj, uint_32 dword );
extern void         ObjWriteIndex( OBJ_WFILE *obj, uint_16 index );
extern void         ObjWrite( OBJ_WFILE *obj, const char *buffer, size_t len );
extern void         ObjWriteRec( OBJ_WFILE *obj, uint_8 command,
                        uint_16 length, const char *contents );
extern obj_offset   ObjWSkip32( OBJ_WFILE *obj );
extern void         ObjWRedo32( OBJ_WFILE *obj, obj_offset off, uint_32 dword );
extern obj_offset   ObjWSkip16( OBJ_WFILE *out );
extern void         ObjWRedo16( OBJ_WFILE *out, obj_offset off, uint_16 word );
#endif