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76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
#ifndef WBUF_H
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#define WBUF_H
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#include <assert.h>
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#include <string.h>
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#include <errno.h>
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#include "memory.h"
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/* When serializing a value, write it into a buffer. */
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/* This code requires that the buffer be big enough to hold whatever you put into it. */
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/* This abstraction doesn't do a good job of hiding its internals.
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* Why? The performance of this code is important, and we want to inline stuff */
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struct wbuf {
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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 void wbuf_init (struct wbuf *w, void *buf, diskoff size) {
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w->buf=buf;
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w->size=size;
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w->ndone=0;
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}
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/* Write a character. */
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static inline void wbuf_char (struct wbuf *w, int ch) {
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assert(w->ndone<w->size);
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w->buf[w->ndone++]=ch;
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}
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static void wbuf_int (struct wbuf *w, unsigned int i) {
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#if 0
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wbuf_char(w, i>>24);
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wbuf_char(w, i>>16);
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wbuf_char(w, i>>8);
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wbuf_char(w, i>>0);
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#else
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assert(w->ndone + 4 <= w->size);
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w->buf[w->ndone+0] = i>>24;
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w->buf[w->ndone+1] = i>>16;
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w->buf[w->ndone+2] = i>>8;
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w->buf[w->ndone+3] = i>>0;
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w->ndone += 4;
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#endif
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}
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static void wbuf_bytes (struct wbuf *w, bytevec bytes_bv, int nbytes) {
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const unsigned char *bytes=bytes_bv;
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wbuf_int(w, nbytes);
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#if 0
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{ int i; for (i=0; i<nbytes; i++) wbuf_char(w, bytes[i]); }
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#else
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assert(w->ndone + nbytes <= w->size);
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memcpy(w->buf + w->ndone, bytes, nbytes);
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w->ndone += nbytes;
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#endif
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}
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static void wbuf_ulonglong (struct wbuf *w, unsigned long long ull) {
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wbuf_int(w, ull>>32);
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wbuf_int(w, ull&0xFFFFFFFF);
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}
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static void wbuf_diskoff (struct wbuf *w, diskoff off) {
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wbuf_ulonglong(w, off);
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}
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static inline void wbuf_txnid (struct wbuf *w, TXNID tid) {
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wbuf_ulonglong(w, tid);
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}
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static inline void wbuf_fileid (struct wbuf *w, unsigned long long fileid) {
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wbuf_ulonglong(w, fileid);
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}
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#endif
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