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#include "scan.h"
#include "scan_urlencoded_query.h"
// Idea is to do a in place replacement or guarantee at least
// strlen( string ) bytes in deststring
// watch http://www.ietf.org/rfc/rfc2396.txt
// unreserved = alphanum | mark
// mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
// we add '%' to the matrix to not stop at encoded chars.
static const unsigned char reserved_matrix[] = { 0xA2, 0x63, 0xFF, 0x03, 0xFE, 0xFF, 0xFF, 0x87, 0xFE, 0xFF, 0xFF, 0x47};
inline int is_unreserved( unsigned char c ) {
if( ( c <= 32 ) || ( c >= 127 ) ) return 0; return 1&(reserved_matrix[(c-32)>>3]>>(c&7));
}
size_t scan_urlencoded_query(char **string, char *deststring, int flags) {
register const unsigned char* s=*(const unsigned char**) string;
unsigned char *d = (unsigned char*)deststring;
register unsigned char b, c;
while ( is_unreserved( c = *s++) ) {
if (c=='%') {
if( ( c = scan_fromhex(*s++) ) == 0xff ) return -1;
if( ( b = scan_fromhex(*s++) ) == 0xff ) return -1;
c=(c<<4)|b;
}
*d++ = c;
}
switch( c ) {
case 0: case '\r': case '\n': case ' ':
if ( ( flags & BREAK_AT_WHITESPACE ) == 0 ) return -1;
break;
case '?':
if ( ( flags & BREAK_AT_QUESTIONMARK ) == 0 ) return -1;
break;
case '=':
if ( ( flags & BREAK_AT_EQUALSIGN ) == 0 ) return -1;
break;
case '&':
if ( ( flags & BREAK_AT_AMPERSAND ) == 0 ) return -1;
break;
default:
return -1;
}
*string = (char *)s;
return d - (unsigned char*)deststring;
}
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