added proxy authentication patch from Jon Thackray <jrmt@uk.gdscorp.com>

[thirdparty/squid.git] / lib / uudecode.c

#include "util.h"

extern char** environ;

/* aaaack but it's fast and const should make it shared text page. */
const int pr2six[256]={
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,62,64,64,64,63,
    52,53,54,55,56,57,58,59,60,61,64,64,64,64,64,64,64,0,1,2,3,4,5,6,7,8,9,
    10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,64,64,64,64,64,64,26,27,
    28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,64,
    64,64,64,64,64,64,64,64,64,64,64,64,64
};

char *uudecode(char *bufcoded) {
    int nbytesdecoded;
    register unsigned char *bufin;
    register char *bufplain;
    register unsigned char *bufout;
    register int nprbytes;
    
    /* Strip leading whitespace. */
    
    while(*bufcoded==' ' || *bufcoded == '\t') bufcoded++;
    
    /* Figure out how many characters are in the input buffer.
     * Allocate this many from the per-transaction pool for the result.
     */
    bufin = (unsigned char *)bufcoded;
    while(pr2six[*(bufin++)] <= 63);
    nprbytes = (char *)bufin - bufcoded - 1;
    nbytesdecoded = ((nprbytes+3)/4) * 3;

    bufplain = xmalloc(nbytesdecoded + 1);
    if (bufplain == NULL)
      return(NULL);
    bufout = (unsigned char *)bufplain;
    
    bufin = (unsigned char *)bufcoded;
    
    while (nprbytes > 0) {
        *(bufout++) = 
            (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
        *(bufout++) = 
            (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
        *(bufout++) = 
            (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
        bufin += 4;
        nprbytes -= 4;
    }
    
    if(nprbytes & 03) {
        if(pr2six[bufin[-2]] > 63)
            nbytesdecoded -= 2;
        else
            nbytesdecoded -= 1;
    }
    bufplain[nbytesdecoded] = '\0';
    return bufplain;
}