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42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
#include "textcode.h"
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size_t scan_uuencoded(const char *src,char *dest,size_t *destlen) {
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size_t len;
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size_t tmp;
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register const unsigned char* s=(const unsigned char*) src;
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size_t i=0;
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if ((len=*s-' ')>64) return 0;
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len&=63;
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++s;
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while (len>0) {
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if (s[0]-' '>64 || s[1]-' '>64 || s[2]-' '>64 || s[3]-' '>64) return 0;
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tmp=(((s[0]-' ')&077) << (3*6)) +
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(((s[1]-' ')&077) << (2*6)) +
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(((s[2]-' ')&077) << (1*6)) +
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(((s[3]-' ')&077));
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s+=4;
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if (len) { if (dest) dest[i++]=tmp>>16; --len; }
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if (len) { if (dest) dest[i++]=tmp>>8; --len; }
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if (len) { if (dest) dest[i++]=tmp&0xff; --len; }
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}
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if (destlen) *destlen=i;
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return (const char*)s-src;
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}
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#ifdef UNITTEST
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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int main() {
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char buf[100];
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size_t i;
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memset(buf,0,100);
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assert(scan_uuencoded("&9FYO<F0*",buf,&i)==9 && i==6 && !memcmp(buf,"fnord\n",7));
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memset(buf,0,100);
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assert(scan_uuencoded("%9FYO<F0`",buf,&i)==9 && i==5 && !memcmp(buf,"fnord",6));
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}
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#endif
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