Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include "fmt.h"
#include "stralloc.h"
#include "textcode.h"
int fmt_yenc_sa(stralloc *sa,const char* src,unsigned int len) {
register const unsigned char* s=(const unsigned char*) src;
unsigned long i;
int linelen=0;
for (i=0; i<len; ++i) {
unsigned char c=s[i]+42;
switch (c) {
case ' ': /* escape space at line ending */
if (linelen==253) {
linelen=0;
if (!stralloc_catb(sa,"\n",1)) return 0;
}
goto dontescape;
case 'F': /* escape "^From " */
if (s[i+1]+42!='r' || s[i+2]+42!='o' || s[i+3]+42!='m' || s[i+4]+42!=' ') goto dontescape;
case '.': /* dot at start of line needs to be escaped */
if (!linelen) goto dontescape;
/* fall through */
case 0:
case '\n':
case '\r':
case '=':
if (!stralloc_catb(sa,"=",1)) return 0;
c+=64;
/* fall through */
default:
dontescape:
++linelen;
if (!stralloc_catb(sa,&c,1)) return 0;
if (linelen>253) {
linelen=0;
if (!stralloc_catb(sa,"\n",1)) return 0;
}
}
}
if (linelen) {
linelen=0;
if (!stralloc_catb(sa,"\n",1)) return 0;
}
return 1;
}