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pack.c
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/**
* pack.c -- perl/python-esque pack/unpack functions
*
* like printf and scanf, but for binary data
*
* Kopyleft (K) 2000 Mazirian
*
* TODO: doubles (dD), smarter strings... (aXXX)
*
*/
/*
* csif - uchar/short/int/float - little-endian (intel)
* CSIF - big-endian (motorola/network)
* 0-9 - string of length (0-9)
*/
#include <stdio.h>
#include <stdarg.h>
#include "pack.h"
/* ------------------------------------------------------------------------ */
int spack(unsigned char *buf, unsigned char *format, ...)
{
va_list ap;
unsigned char *bp = buf;
unsigned char *fp = format;
unsigned char *str;
unsigned char c;
short s;
int i;
va_start(ap, format);
do {
switch (*fp) {
case 'c':
case 'C':
c = va_arg(ap, unsigned char);
*bp++ = c;
break;
case 's':
s = va_arg(ap, short);
*bp++ = (s >> 0) & 0xFF;
*bp++ = (s >> 8) & 0xFF;
break;
case 'S':
s = va_arg(ap, short);
*bp++ = (s >> 8) & 0xFF;
*bp++ = (s >> 0) & 0xFF;
break;
case 'i':
case 'f':
i = va_arg(ap, int);
*bp++ = (s >> 0) & 0xFF;
*bp++ = (s >> 8) & 0xFF;
*bp++ = (s >> 16) & 0xFF;
*bp++ = (s >> 24) & 0xFF;
break;
case 'I':
case 'F':
i = va_arg(ap, int);
*bp++ = (s >> 24) & 0xFF;
*bp++ = (s >> 16) & 0xFF;
*bp++ = (s >> 8) & 0xFF;
*bp++ = (s >> 0) & 0xFF;
break;
default:
if (*fp >= '0' && *fp <= '9') {
str = va_arg(ap, unsigned char*);
for (i=0; i < *fp - '0'; i++) {
*bp++ = *str++;
}
} else {
printf("fpack: bad format (%d)\n", *fp);
}
break;
}
} while (*(++fp));
va_end(ap);
return (bp-buf);
}
/* ------------------------------------------------------------------------ */
int fpack(FILE *file, unsigned char *format, ...)
{
va_list ap;
unsigned char *fp = format;
unsigned char *str;
unsigned char c;
short s;
int i;
va_start(ap, format);
do {
switch (*fp) {
case 'c':
case 'C':
c = va_arg(ap, unsigned char);
putc(c,file);
break;
case 's':
s = va_arg(ap, short);
putc((s >> 0) & 0xFF, file);
putc((s >> 8) & 0xFF, file);
break;
case 'S':
s = va_arg(ap, short);
putc((s >> 8) & 0xFF, file);
putc((s >> 0) & 0xFF, file);
break;
case 'i':
case 'f':
i = va_arg(ap, int);
putc((s >> 0) & 0xFF, file);
putc((s >> 8) & 0xFF, file);
putc((s >> 16) & 0xFF, file);
putc((s >> 24) & 0xFF, file);
break;
case 'I':
case 'F':
i = va_arg(ap, int);
putc((s >> 24) & 0xFF, file);
putc((s >> 16) & 0xFF, file);
putc((s >> 8) & 0xFF, file);
putc((s >> 0) & 0xFF, file);
break;
default:
if (*fp >= '0' && *fp <= '9') {
str = va_arg(ap, unsigned char*);
for (i=0; i < *fp - '0'; i++) {
putc(*str++, file);
}
} else {
printf("fpack: bad format (%d)\n", *fp);
}
break;
}
} while (*(++fp));
va_end(ap);
return 1;
}
/* ------------------------------------------------------------------------ */
int sunpack(unsigned char *buf, unsigned char *format, ...)
{
va_list ap;
unsigned char *bp = buf;
unsigned char *fp = format;
unsigned char *str;
unsigned char c;
short s;
int i;
va_start(ap, format);
do {
switch (*fp) {
case 'c':
case 'C':
c = *bp++;
*(va_arg(ap, unsigned char*)) = c;
break;
case 's':
s = (*bp++) << 0;
s |= (*bp++) << 8;
*(va_arg(ap, short*)) = s;
break;
case 'S':
s = (*bp++) << 8;
s |= (*bp++) << 0;
*(va_arg(ap, short*)) = s;
break;
case 'i':
case 'f':
i = (*bp++) << 0;
i |= (*bp++) << 8;
i |= (*bp++) << 16;
i |= (*bp++) << 24;
*(va_arg(ap, int*)) = i;
break;
case 'I':
case 'F':
i = (*bp++) << 24;
i |= (*bp++) << 16;
i |= (*bp++) << 8;
i |= (*bp++) << 0;
*(va_arg(ap, int*)) = i;
break;
default:
if (*fp >= '0' && *fp <= '9') {
str = va_arg(ap, unsigned char*);
for (i=0; i < *fp - '0'; i++) {
*str++ = *bp++;
}
} else {
printf("sunpack: bad format (%d)\n", *fp);
}
break;
}
} while (*(++fp));
va_end(ap);
return bp-buf;
}
/* ------------------------------------------------------------------------ */
int funpack(FILE *file, unsigned char *format, ...)
{
va_list ap;
unsigned char *fp = format;
unsigned char *str;
unsigned char c;
short s;
int i;
va_start(ap, format);
do {
switch (*fp) {
case 'c':
case 'C':
c = getc(file);
*(va_arg(ap, unsigned char*)) = c;
break;
case 's':
s = getc(file) << 0;
s |= getc(file) << 8;
*(va_arg(ap, short*)) = s;
break;
case 'S':
s = getc(file) << 8;
s |= getc(file) << 0;
*(va_arg(ap, short*)) = s;
break;
case 'i':
case 'f':
i = getc(file) << 0;
i |= getc(file) << 8;
i |= getc(file) << 16;
i |= getc(file) << 24;
*(va_arg(ap, int*)) = i;
break;
case 'I':
case 'F':
i = getc(file) << 24;
i |= getc(file) << 16;
i |= getc(file) << 8;
i |= getc(file) << 0;
*(va_arg(ap, int*)) = i;
break;
default:
if (*fp >= '0' && *fp <= '9') {
str = va_arg(ap, unsigned char*);
for (i=0; i < *fp - '0'; i++) {
*str++ = getc(file);
}
} else {
printf("funpack: bad format (%d)\n", *fp);
}
break;
}
} while (*(++fp));
va_end(ap);
return 1;
}
/* ------------------------------------------------------------------------ */
#if 1
int main (int argc, char **argv) {
FILE *fp = fopen("Bunny.ply", "rb");
unsigned char ply[4] = {'A', 'S', 'D', 0};
int version, nattr; unsigned char r, g, b; float diff;
funpack(fp, "3iicccf", ply, &version, &nattr, &r, &g, &b, &diff);
printf("%s - %d / %d: %d %d %d - %f\n",ply,version,nattr,r,g,b,diff);
}
#endif