You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
#include <inttypes.h>
|
|
#include <string.h>
|
|
#include "entities.h"
|
|
|
|
#include "fmt.h"
|
|
#include "textcode.h"
|
|
#include "haveinline.h"
|
|
#include "scan.h"
|
|
#include "case.h"
|
|
#include "str.h"
|
|
|
|
static const char* lookup(size_t ofs,const char* t) {
|
|
if (ofs>entities.tab[0]) return 0;
|
|
while (ofs<entities.tab[0]) {
|
|
unsigned char ch=entities.tab[ofs]&0xff;
|
|
if (ch==(unsigned char)*t || (!ch && *t==';')) {
|
|
if (!ch || *t==';')
|
|
return entities.data+(entities.tab[ofs]>>8);
|
|
else
|
|
return lookup(entities.tab[ofs]>>8,t+1);
|
|
} else
|
|
++ofs;
|
|
if (!ch) break;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
enum htmlmode { /* <a href="http://example.com/"foo">libowfat<home</a> */
|
|
OUTSIDE, /* ^^^^^^^^^^^^^^^^ -> libowfat<home */
|
|
TAGARG, /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -> http://example.com/"foo */
|
|
};
|
|
|
|
static size_t scan_html_inner(const char *src,char *dest,size_t *destlen,enum htmlmode mode) {
|
|
register const unsigned char* s=(const unsigned char*) src;
|
|
size_t written=0,i;
|
|
int dq=0;
|
|
for (i=0; s[i]; ++i) {
|
|
if (s[i]=='&') {
|
|
const char* utf8;
|
|
if (s[i+1]=='#') {
|
|
unsigned long l;
|
|
size_t j;
|
|
if ((s[i+2]&~32)=='X') {
|
|
j=scan_xlong(src+i+3,&l);
|
|
if (j) j+=3;
|
|
} else {
|
|
j=scan_ulong(src+i+2,&l);
|
|
if (j) j+=2;
|
|
}
|
|
if (s[i+j]==';') {
|
|
i+=j;
|
|
written+=fmt_utf8(dest?dest+written:0,l);
|
|
} else {
|
|
if (dest) dest[written]='&';
|
|
++written;
|
|
}
|
|
continue;
|
|
}
|
|
utf8=lookup(1,src+i+1);
|
|
if (utf8) {
|
|
size_t l=strlen(utf8);
|
|
if (dest) memcpy(dest+written,utf8,l);
|
|
written+=l;
|
|
i+=2+str_chr(src+i+2,';');
|
|
continue;
|
|
} else
|
|
if (dest) dest[written]='&';
|
|
} else if (s[i]=='<') {
|
|
break;
|
|
} else if (s[i]=='"' && mode==TAGARG) {
|
|
if (i==0) { dq=1; continue; }
|
|
break;
|
|
} else if (mode==TAGARG && !dq && (s[i]==' ' || s[i]=='\t' || s[i]=='\n'))
|
|
break;
|
|
else
|
|
if (dest) dest[written]=s[i];
|
|
++written;
|
|
}
|
|
if (destlen) *destlen=written;
|
|
return i;
|
|
}
|
|
|
|
size_t scan_html_tagarg(const char *src,char *dest,size_t *destlen) {
|
|
return scan_html_inner(src,dest,destlen,TAGARG);
|
|
}
|
|
|
|
size_t scan_html(const char *src,char *dest,size_t *destlen) {
|
|
return scan_html_inner(src,dest,destlen,OUTSIDE);
|
|
}
|
|
|
|
#ifdef UNITTEST
|
|
#include <assert.h>
|
|
#undef UNITTEST
|
|
#include <scan/scan_fromhex.c>
|
|
#include <scan/scan_xlongn.c>
|
|
#include <scan/scan_xlong.c>
|
|
#include <scan/scan_ulongn.c>
|
|
#include <scan/scan_ulong.c>
|
|
#include <str/str_chr.c>
|
|
#include <fmt/fmt_utf8.c>
|
|
#include <stdio.h>
|
|
|
|
int main() {
|
|
char* html="<a href=\"http://example.com/"foo\">libowfat<home</a>";
|
|
char buf[100];
|
|
size_t destlen;
|
|
/* check that we stop at < */
|
|
assert(scan_html(html,buf,&destlen)==0 && destlen==0);
|
|
/* check that we properly decode < */
|
|
memset(buf,'?',sizeof(buf));
|
|
assert(scan_html(strchr(html,'>')+1,buf,&destlen)==16 && destlen==13 && !memcmp(buf,"libowfat<home?",14));
|
|
/* check that we stop at " and properly decode " */
|
|
memset(buf,'?',sizeof(buf));
|
|
assert(scan_html_tagarg(strchr(html,'"')+1,buf,&destlen)==28 && destlen==23 && !memcmp(buf,"http://example.com/\"foo?",24));
|
|
/* check that we pass through invalid escapes */
|
|
memset(buf,'?',sizeof(buf));
|
|
assert(scan_html("&fnord;",buf,&destlen)==7 && destlen==7 && !memcmp(buf,"&fnord;?",8));
|
|
memset(buf,'?',sizeof(buf));
|
|
assert(scan_html("&#x;",buf,&destlen)==4 && destlen==4 && !memcmp(buf,"&#x;?",5));
|
|
memset(buf,'?',sizeof(buf));
|
|
assert(scan_html("&#;",buf,&destlen)==3 && destlen==3 && !memcmp(buf,"&#;?",4));
|
|
/* check that &#x[hex]; is decoded properly */
|
|
memset(buf,'?',sizeof(buf));
|
|
assert(scan_html("",buf,&destlen)==5 && destlen==1 && buf[0]==1 && buf[1]=='?');
|
|
/* check that &#[decimal]; is decoded properly */
|
|
memset(buf,'?',sizeof(buf));
|
|
assert(scan_html("",buf,&destlen)==4 && destlen==1 && buf[0]==1 && buf[1]=='?');
|
|
}
|
|
#endif
|