91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
#ifndef DATASTREAM_H
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#define DATASTREAM_H
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/*
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* Copyright 1988 Silicon Graphics, Inc. All rights reserved.
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*
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* Byte-ordered data streams.
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* Integer data may be represented using big or little endian byte order,
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* without alignment or quantization. Floating point data is IEEE.
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*/
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struct protofield;
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struct expr;
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enum dsdirection { DS_DECODE, DS_ENCODE };
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enum dsbyteorder { DS_BIG_ENDIAN, DS_LITTLE_ENDIAN };
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enum dsextendhow { DS_SIGN_EXTEND, DS_ZERO_EXTEND };
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enum dsseekbasis { DS_ABSOLUTE, DS_RELATIVE };
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typedef struct datastream {
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struct dsops *ds_ops; /* see below */
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enum dsdirection ds_direction; /* whether to get or to put */
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int ds_size; /* initial byte count */
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int ds_count; /* bytes remaining */
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int ds_bitoff; /* bit offset in next byte */
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unsigned char *ds_next; /* next byte to get/put */
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} DataStream;
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struct dsops {
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enum dsbyteorder dso_byteorder;
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int (*dso_bits)(DataStream*, long*, unsigned int, enum dsextendhow);
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int (*dso_short)(DataStream *, short *);
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int (*dso_long)(DataStream *, long *);
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int (*dso_float)(DataStream *, float *);
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int (*dso_double)(DataStream *, double *);
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};
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#define DefineDataStreamOperations(name,tag,order) \
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int makeident2(tag,_bits)(DataStream*,long*,unsigned int,enum dsextendhow);\
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int makeident2(tag,_short)(DataStream *, short *); \
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int makeident2(tag,_long)(DataStream *, long *); \
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int makeident2(tag,_float)(DataStream *, float *); \
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int makeident2(tag,_double)(DataStream *, double *); \
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struct dsops name = { \
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order, \
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makeident2(tag,_bits), \
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makeident2(tag,_short), \
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makeident2(tag,_long), \
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makeident2(tag,_float), \
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makeident2(tag,_double) \
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}
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/*
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* Macros to call the virtual operations.
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*/
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#define ds_bits(ds,lp,len,how) ((*(ds)->ds_ops->dso_bits)(ds,lp,len,how))
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#define ds_short(ds, sp) ((*(ds)->ds_ops->dso_short)(ds, sp))
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#define ds_long(ds, lp) ((*(ds)->ds_ops->dso_long)(ds, lp))
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#define ds_float(ds, fp) ((*(ds)->ds_ops->dso_float)(ds, fp))
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#define ds_double(ds, dp) ((*(ds)->ds_ops->dso_double)(ds, dp))
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/*
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* Macros for other integral types.
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*/
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#define ds_char(ds, cp) ds_byte(ds, cp)
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#define ds_u_char(ds, cp) ds_byte(ds, (char *) cp)
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#define ds_u_short(ds, sp) ds_short(ds, (short *)(sp))
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#define ds_u_long(ds, lp) ds_long(ds, (long *)(lp))
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/*
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* Tell and bitwise tell macros.
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*/
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#define DS_TELL(ds) ((ds)->ds_size - (ds)->ds_count)
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#define DS_TELLBIT(ds) (DS_TELL(ds) * BITSPERBYTE + (ds)->ds_bitoff)
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DataStream *datastream(char *, int, enum dsdirection, enum dsbyteorder);
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void ds_destroy(DataStream *);
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void ds_init(DataStream *, unsigned char *, int, enum dsdirection,
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enum dsbyteorder);
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enum dsbyteorder ds_setbyteorder(DataStream *, enum dsbyteorder);
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int ds_seek(DataStream *, int, enum dsseekbasis);
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int ds_seekbit(DataStream *, int, enum dsseekbasis);
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int ds_tell(DataStream *);
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int ds_tellbit(DataStream *);
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int ds_byte(DataStream *, char *);
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int ds_bytes(DataStream *, void *, unsigned int);
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int ds_int(DataStream *, long *, int, enum dsextendhow);
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int ds_field(DataStream *, struct protofield *, int, struct expr *);
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char *ds_inline(DataStream *, unsigned int, int);
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#endif
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