src/TortoisePlink/utils/percent_decode.c

   1 /*
   2  * Decode %-encoding in URL style.
   3  */
   4
   5 #include <ctype.h>
   6
   7 #include "misc.h"
   8
   9 void percent_decode_bs(BinarySink *bs, ptrlen data)
  10 {
  11     for (const char *p = data.ptr, *e = ptrlen_end(data); p < e; p++) {
  12         char c = *p;
  13         if (c == '%' && e-p >= 3 &&
  14             isxdigit((unsigned char)p[1]) &&
  15             isxdigit((unsigned char)p[2])) {
  16             char hex[3];
  17             hex[0] = p[1];
  18             hex[1] = p[2];
  19             hex[2] = '\0';
  20             put_byte(bs, strtoul(hex, NULL, 16));
  21             p += 2;
  22         } else {
  23             put_byte(bs, c);
  24         }
  25     }
  26
  27 }
  28
  29 void percent_decode_fp(FILE *fp, ptrlen data)
  30 {
  31     stdio_sink ss;
  32     stdio_sink_init(&ss, fp);
  33     percent_decode_bs(BinarySink_UPCAST(&ss), data);
  34 }
  35
  36 strbuf *percent_decode_sb(ptrlen data)
  37 {
  38     strbuf *sb = strbuf_new();
  39     percent_decode_bs(BinarySink_UPCAST(sb), data);
  40     return sb;
  41 }