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#include "urldecode.h"
#include <stdlib.h>
#include <ctype.h>
#define hex2int(a) do { \
if ( a >= 'a' ) { \
a = (char)(a - ( 'a' - 'A' - 10 )); \
} else if ( a > 'F' ) { \
goto normie; \
} else if ( a >= 'A' ) { \
a = (char)(a - ( 'A' - 10 )); \
} else if ( a < '0' || a > '9' ) { \
goto normie; \
} else { \
a = (char)(a - '0'); \
} \
} while (0)
void urldecode(struct string* str, struct field *out, size_t *out_num)
{
char *src = (char*)str->s;
char *dst = src;
const char * const end = str->s + str->l;
char a, b;
size_t max_out = *out_num;
*out_num = 0;
do {
if ( *out_num == max_out ) return;
out->name.s = dst;
while ( src < end && *src != '=' ) {
*dst++ = *src++;
}
if ( src == end ) return;
out->name.l = (size_t)( dst - out->name.s );
++src;
out->value.s = ++dst;
while ( src < end && *src != '&' ) {
if ( *src == '%' && src + 2 < end ) {
if ( src[1] > 'f' || src[2] > 'f' ) goto normie;
a = src[1];
hex2int(a);
b = src[2];
hex2int(b);
*dst++ = (char)( (16 * a) + b );
src += 3;
} else if (*src == '+') {
*dst++ = (char)' ';
++src;
} else {
normie:;
*dst++ = *src++;
}
}
out->value.l = (size_t)( dst - out->value.s );
out++;
(*out_num)++;
if ( src++ >= end ) return;
++dst;
} while ( 1 );
}
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