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/*
http://code.google.com/p/inferno-os/source/browse/include/bio.h
Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#ifndef _BIO_H_
#define _BIO_H_ 1
#if defined(__cplusplus)
extern "C" {
#endif
#ifdef AUTOLIB
AUTOLIB(bio)
#endif
typedef struct Biobuf Biobuf;
enum
{
Bsize = 8*1024,
Bungetsize = 4, /* space for ungetc */
Bmagic = 0x314159,
Beof = -1,
Bbad = -2,
Binactive = 0, /* states */
Bractive,
Bwactive,
Bracteof,
Bend
};
struct Biobuf
{
int icount; /* neg num of bytes at eob */
int ocount; /* num of bytes at bob */
int rdline; /* num of bytes after rdline */
int runesize; /* num of bytes of last getrune */
int state; /* r/w/inactive */
int fid; /* open file */
int flag; /* magic if malloc'ed */
vlong offset; /* offset of buffer in file */
int bsize; /* size of buffer */
unsigned char* bbuf; /* pointer to beginning of buffer */
unsigned char* ebuf; /* pointer to end of buffer */
unsigned char* gbuf; /* pointer to good data in buf */
unsigned char b[Bungetsize+Bsize];
};
/*
* These macros get 1-, 2-, and 4-byte integer values by reading the
* next few bytes in little-endian order.
*/
#define BGETC(bp)\
((bp)->icount?(int)((bp)->ebuf[(bp)->icount++]):Bgetc((bp)))
#define BGETLE2(bp)\
((bp)->icount<=-2?((bp)->icount+=2,((bp)->ebuf[(bp)->icount-2])|((bp)->ebuf[(bp)->icount-1]<<8)):Bgetle2((bp)))
#define BGETLE4(bp)\
(int)((bp)->icount<=-4?((bp)->icount+=4,((bp)->ebuf[(bp)->icount-4])|((bp)->ebuf[(bp)->icount-3]<<8)|((bp)->ebuf[(bp)->icount-2]<<16)|((uint32)(bp)->ebuf[(bp)->icount-1]<<24)):Bgetle4((bp)))
/*
* These macros put 1-, 2-, and 4-byte integer values by writing the
* next few bytes in little-endian order.
*/
#define BPUTC(bp,c)\
((bp)->ocount?(bp)->ebuf[(bp)->ocount++]=(unsigned char)(c),0:Bputc((bp),(c)))
#define BPUTLE2(bp,c)\
((bp)->ocount<=-2?(bp)->ocount+=2,(bp)->ebuf[(bp)->ocount-2]=(unsigned char)(c),(bp)->ebuf[(bp)->ocount-1]=(unsigned char)(c>>8),0:Bputle2((bp),(c)))
#define BPUTLE4(bp,c)\
((bp)->ocount<=-4?(bp)->ocount+=4,(bp)->ebuf[(bp)->ocount-4]=(unsigned char)(c),(bp)->ebuf[(bp)->ocount-3]=(unsigned char)(c>>8),(bp)->ebuf[(bp)->ocount-2]=(unsigned char)(c>>16),(bp)->ebuf[(bp)->ocount-1]=(unsigned char)(c>>24),0:Bputle4((bp),(c)))
#define BOFFSET(bp)\
(((bp)->state==Bractive)?\
(bp)->offset + (bp)->icount:\
(((bp)->state==Bwactive)?\
(bp)->offset + ((bp)->bsize + (bp)->ocount):\
-1))
#define BLINELEN(bp)\
(bp)->rdline
#define BFILDES(bp)\
(bp)->fid
int Bbuffered(Biobuf*);
Biobuf* Bfdopen(int, int);
int Bfildes(Biobuf*);
int Bflush(Biobuf*);
int Bgetc(Biobuf*);
int Bgetle2(Biobuf*);
int Bgetle4(Biobuf*);
int Bgetd(Biobuf*, double*);
long Bgetrune(Biobuf*);
int Binit(Biobuf*, int, int);
int Binits(Biobuf*, int, int, unsigned char*, int);
int Blinelen(Biobuf*);
vlong Boffset(Biobuf*);
Biobuf* Bopen(char*, int);
int Bprint(Biobuf*, char*, ...);
int Bputc(Biobuf*, int);
int Bputle2(Biobuf*, int);
int Bputle4(Biobuf*, int);
int Bputrune(Biobuf*, long);
void* Brdline(Biobuf*, int);
char* Brdstr(Biobuf*, int, int);
long Bread(Biobuf*, void*, long);
vlong Bseek(Biobuf*, vlong, int);
int Bterm(Biobuf*);
int Bungetc(Biobuf*);
int Bungetrune(Biobuf*);
long Bwrite(Biobuf*, void*, long);
int Bvprint(Biobuf*, char*, va_list);
#if defined(__cplusplus)
}
#endif
#endif
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