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#include "fmt.h"
#include "textcode.h"
#include "scan.h"
static size_t inner_scan_urlencoded(const char *src,char *dest,size_t *destlen,int plus) {
register const unsigned char* s=(const unsigned char*) src;
size_t written=0,i;
for (i=0; s[i]; ++i) {
if (s[i]=='%') {
int j=scan_fromhex(s[i+1]);
unsigned char c;
if (j<0) break;
c=j<<4;
j=scan_fromhex(s[i+2]);
if (j<0) break;
dest[written]=c|j;
i+=2;
} else if (s[i]=='+' && plus)
dest[written]=' ';
else if (s[i]<=' ' || s[i]=='?' || s[i]=='&')
break; /* invalid input */
else
dest[written]=s[i];
++written;
}
*destlen=written;
return i;
}
size_t scan_urlencoded(const char *src,char *dest,size_t *destlen) {
return inner_scan_urlencoded(src,dest,destlen,1);
}
size_t scan_urlencoded2(const char *src,char *dest,size_t *destlen) {
return inner_scan_urlencoded(src,dest,destlen,0);
}
#ifdef UNITTEST
#include <assert.h>
#include <string.h>
#undef UNITTEST
#include <scan/scan_fromhex.c>
int main() {
char buf[100];
size_t l;
/* check base operation */
memset(buf,'?',sizeof(buf));
assert(scan_urlencoded("foo%2ebar",buf,&l)==9 && l==7 && !memcmp(buf,"foo.bar?",8));
/* check + handling */
memset(buf,'?',sizeof(buf));
assert(scan_urlencoded("foo+bar",buf,&l)==7 && l==7 && !memcmp(buf,"foo bar?",8));
assert(scan_urlencoded2("foo+bar",buf,&l)==7 && l==7 && !memcmp(buf,"foo+bar?",8));
/* check that we abort on invalid sequences */
memset(buf,'?',sizeof(buf));
assert(scan_urlencoded("foo%2xbar",buf,&l)==3 && l==3 && !memcmp(buf,"foo?",4));
assert(scan_urlencoded("foo\nbar",buf,&l)==3 && l==3 && !memcmp(buf,"foo?",4));
assert(scan_urlencoded("foo bar",buf,&l)==3 && l==3 && !memcmp(buf,"foo?",4));
}
#endif
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