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87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
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It is considered beerware. Prost. Skol. Cheers or whatever. */
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#include "scan.h"
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#include "scan_urlencoded_query.h"
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/* Idea is to do a in place replacement or guarantee at least
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strlen( string ) bytes in deststring
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watch http://www.ietf.org/rfc/rfc2396.txt
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unreserved = alphanum | mark
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mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
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we add '%' to the matrix to not stop at encoded chars.
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After losing too many requests to being too strict, add the following characters to reserved matrix
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relax = "+" | "," | "/" | ";" | "<" | ">" | ":"
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static const unsigned char reserved_matrix_strict[] = { 0xA2, 0x67, 0xFF, 0x03, 0xFE, 0xFF, 0xFF, 0x87, 0xFE, 0xFF, 0xFF, 0x47};
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*/
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static const unsigned char reserved_matrix[] = { 0xA2, 0xFF, 0xFF, 0x5F, 0xFE, 0xFF, 0xFF, 0x87, 0xFE, 0xFF, 0xFF, 0x47};
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static int is_unreserved( unsigned char c ) {
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if( ( c <= 32 ) || ( c >= 127 ) ) return 0; return 1&(reserved_matrix[(c-32)>>3]>>(c&7));
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}
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ssize_t scan_urlencoded_query(char **string, char *deststring, int flags) {
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register const unsigned char* s=*(const unsigned char**) string;
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unsigned char *d = (unsigned char*)deststring;
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register unsigned char b, c;
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retry_parsing:
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while( is_unreserved( c = *s++) ) {
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if( c=='%') {
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if( ( c = scan_fromhex(*s++) ) == 0xff ) return -1;
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if( ( b = scan_fromhex(*s++) ) == 0xff ) return -1;
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c=(c<<4)|b;
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}
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if( d ) *d++ = c;
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}
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switch( c ) {
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case 0: case '\r': case '\n': case ' ':
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if( d == (unsigned char*)deststring ) return -2;
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--s;
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break;
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case '?':
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if( flags == SCAN_PATH ) goto found_terminator;
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if( d ) *d++ = c;
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goto retry_parsing;
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break;
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case '=':
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if( flags != SCAN_SEARCHPATH_PARAM ) return -1;
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break;
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case '&':
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if( flags == SCAN_PATH ) return -1;
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if( flags == SCAN_SEARCHPATH_PARAM ) --s;
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break;
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default:
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return -1;
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}
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found_terminator:
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*string = (char *)s;
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return d - (unsigned char*)deststring;
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}
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ssize_t scan_fixed_int( char *data, size_t len, int *tmp ) {
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*tmp = 0;
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while( (len > 0) && (*data >= '0') && (*data <= '9') ) { --len; *tmp = 10**tmp + *data++-'0'; }
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return len;
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}
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ssize_t scan_fixed_ip( char *data, size_t len, unsigned char ip[4] ) {
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int u, i;
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for( i=0; i<4; ++i ) {
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ssize_t j = scan_fixed_int( data, len, &u );
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if( j == len ) return len;
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ip[i] = u;
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data += len - j;
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len = j;
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if ( i<3 ) {
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if( !len || *data != '.') return -1;
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--len; ++data;
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}
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}
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return len;
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}
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