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34 lines
723 B
C
34 lines
723 B
C
#include "stralloc.h"
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#include "textcode.h"
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#include "haveinline.h"
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static inline int dec(unsigned char x) {
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if (x>='A' && x<='Z') return x-'A';
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if (x>='a' && x<='z') return x-'a'+26;
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if (x>='0' && x<='9') return x-'0'+26+26;
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switch (x) {
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case '+': return 62;
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case '/': return 63;
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default: return -1;
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}
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}
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int scan_base64_sa(const char *src,stralloc* sa) {
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unsigned short tmp=0,bits=0;
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register const unsigned char* s=(const unsigned char*) src;
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for (;;) {
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int a=dec(*s);
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if (a<0) {
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while (*s=='=') ++s;
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break;
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}
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tmp=(tmp<<6)|a; bits+=6;
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++s;
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if (bits>=8) {
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char dest=(tmp>>(bits-=8));
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if (!stralloc_catb(sa,&dest,1)) return 0;
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}
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}
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return 1;
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}
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