/*
* Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "config.h"
#include <string.h>
#import "OFString.h"
#import "OFInvalidFormatException.h"
#import "OFUnknownXMLEntityException.h"
int _OFString_XMLUnescaping_reference;
static OF_INLINE OFString *
parseNumericEntity(const char *entity, size_t length)
{
OFUnichar c;
size_t i;
char buffer[5];
if (length == 1 || *entity != '#')
return nil;
c = 0;
entity++;
length--;
if (entity[0] == 'x') {
if (length == 1)
return nil;
entity++;
length--;
for (i = 0; i < length; i++) {
if (entity[i] >= '0' && entity[i] <= '9')
c = (c << 4) | (entity[i] - '0');
else if (entity[i] >= 'A' && entity[i] <= 'F')
c = (c << 4) | (entity[i] - 'A' + 10);
else if (entity[i] >= 'a' && entity[i] <= 'f')
c = (c << 4) | (entity[i] - 'a' + 10);
else
return nil;
}
} else {
for (i = 0; i < length; i++) {
if (entity[i] >= '0' && entity[i] <= '9')
c = (c * 10) + (entity[i] - '0');
else
return nil;
}
}
if ((i = of_string_utf8_encode(c, buffer)) == 0)
return nil;
buffer[i] = 0;
return [OFString stringWithUTF8String: buffer length: i];
}
static OFString *
parseEntities(OFString *self, id (*lookup)(void *, OFString *, OFString *),
void *context)
{
OFMutableString *ret;
void *pool;
const char *string;
size_t i, last, length;
bool inEntity;
ret = [OFMutableString string];
pool = objc_autoreleasePoolPush();
string = self.UTF8String;
length = self.UTF8StringLength;
last = 0;
inEntity = false;
for (i = 0; i < length; i++) {
if (!inEntity && string[i] == '&') {
[ret appendUTF8String: string + last length: i - last];
last = i + 1;
inEntity = true;
} else if (inEntity && string[i] == ';') {
const char *entity = string + last;
size_t entityLength = i - last;
if (entityLength == 2 && memcmp(entity, "lt", 2) == 0)
[ret appendCString: "<"
encoding: OFStringEncodingASCII
length: 1];
else if (entityLength == 2 &&
memcmp(entity, "gt", 2) == 0)
[ret appendCString: ">"
encoding: OFStringEncodingASCII
length: 1];
else if (entityLength == 4 &&
memcmp(entity, "quot", 4) == 0)
[ret appendCString: "\""
encoding: OFStringEncodingASCII
length: 1];
else if (entityLength == 4 &&
memcmp(entity, "apos", 4) == 0)
[ret appendCString: "'"
encoding: OFStringEncodingASCII
length: 1];
else if (entityLength == 3 &&
memcmp(entity, "amp", 3) == 0)
[ret appendCString: "&"
encoding: OFStringEncodingASCII
length: 1];
else if (entity[0] == '#') {
void *pool2;
OFString *tmp;
pool2 = objc_autoreleasePoolPush();
tmp = parseNumericEntity(entity,
entityLength);
if (tmp == nil)
@throw [OFInvalidFormatException
exception];
[ret appendString: tmp];
objc_autoreleasePoolPop(pool2);
} else {
void *pool2;
OFString *name, *tmp;
pool2 = objc_autoreleasePoolPush();
name = [OFString
stringWithUTF8String: entity
length: entityLength];
tmp = lookup(context, self, name);
if (tmp == nil)
@throw [OFUnknownXMLEntityException
exceptionWithEntityName: name];
[ret appendString: tmp];
objc_autoreleasePoolPop(pool2);
}
last = i + 1;
inEntity = false;
}
}
if (inEntity)
@throw [OFInvalidFormatException exception];
[ret appendUTF8String: string + last length: i - last];
[ret makeImmutable];
objc_autoreleasePoolPop(pool);
return ret;
}
static id
lookupUsingDelegate(void *context, OFString *self, OFString *entity)
{
id <OFStringXMLUnescapingDelegate> delegate = context;
if (delegate == nil)
return nil;
return [delegate string: self containsUnknownEntityNamed: entity];
}
#ifdef OF_HAVE_BLOCKS
static id
lookupUsingBlock(void *context, OFString *self, OFString *entity)
{
OFStringXMLUnescapingBlock block = context;
if (block == NULL)
return nil;
return block(self, entity);
}
#endif
@implementation OFString (XMLUnescaping)
- (OFString *)stringByXMLUnescaping
{
return [self stringByXMLUnescapingWithDelegate: nil];
}
- (OFString *)stringByXMLUnescapingWithDelegate:
(id <OFStringXMLUnescapingDelegate>)delegate
{
return parseEntities(self, lookupUsingDelegate, delegate);
}
#ifdef OF_HAVE_BLOCKS
- (OFString *)stringByXMLUnescapingWithBlock: (OFStringXMLUnescapingBlock)block
{
return parseEntities(self, lookupUsingBlock, block);
}
#endif
@end