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52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
#ifndef RBUF_H
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#define RBUF_H
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#include <assert.h>
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struct rbuf {
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unsigned char *buf;
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unsigned int size;
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unsigned int ndone;
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};
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static unsigned int rbuf_char (struct rbuf *r) {
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assert(r->ndone<r->size);
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return r->buf[r->ndone++];
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}
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static unsigned int rbuf_int (struct rbuf *r) {
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unsigned char c0 = rbuf_char(r);
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unsigned char c1 = rbuf_char(r);
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unsigned char c2 = rbuf_char(r);
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unsigned char c3 = rbuf_char(r);
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return ((c0<<24)|
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(c1<<16)|
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(c2<<8)|
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(c3<<0));
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}
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static inline void rbuf_literal_bytes (struct rbuf *r, bytevec *bytes, unsigned int n_bytes) {
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*bytes = &r->buf[r->ndone];
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r->ndone+=n_bytes;
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assert(r->ndone<=r->size);
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}
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/* Return a pointer into the middle of the buffer. */
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static void rbuf_bytes (struct rbuf *r, bytevec *bytes, unsigned int *n_bytes)
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{
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*n_bytes = rbuf_int(r);
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rbuf_literal_bytes(r, bytes, *n_bytes);
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}
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static unsigned long long rbuf_ulonglong (struct rbuf *r) {
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unsigned i0 = rbuf_int(r);
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unsigned i1 = rbuf_int(r);
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return ((unsigned long long)(i0)<<32) | ((unsigned long long)(i1));
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}
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static DISKOFF rbuf_diskoff (struct rbuf *r) {
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unsigned i0 = rbuf_int(r);
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unsigned i1 = rbuf_int(r);
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return ((unsigned long long)(i0)<<32) | ((unsigned long long)(i1));
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}
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#endif
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