how to re-encode data from CFFTPCreateParsedResourceListing function? - ios

Question

i try to communicate with FTP server using CFNetwork.framework.
using CFFTP API(CFWriteStreamCreateWithFTPURL function), i get a NSData of specific URL.
then i start to parse the NSData with CFFTPCreateParsedResourceListing function, it gives me poorly encoded filenames.(when the file name is Korean)
all character in Korean is converted to question mark(?).
how can i fix this? please give me some advice. thank you in advance.
NSMutableArray * newEntries;
NSUInteger offset;
newEntries = [NSMutableArray array];
assert(newEntries != nil);
offset = 0;
do {
CFIndex bytesConsumed;
CFDictionaryRef thisEntry;
thisEntry = NULL;
assert(offset <= [self.listData length]);
bytesConsumed = CFFTPCreateParsedResourceListing(NULL, &((const uint8_t *) self.listData.bytes)[offset], (CFIndex) ([self.listData length] - offset), &thisEntry);
if (bytesConsumed > 0) {
if (thisEntry != NULL) {
NSDictionary * entryToAdd;
entryToAdd = [self entryByReencodingNameInEntry:(__bridge NSDictionary *) thisEntry encoding:NSUTF8StringEncoding];
[newEntries addObject:entryToAdd];
}
offset += (NSUInteger) bytesConsumed;
}
if (thisEntry != NULL) {
CFRelease(thisEntry);
}
if (bytesConsumed == 0) {
break;
} else if (bytesConsumed < 0) {
[self stopReceiveWithStatus:#"Listing parse failed"];
break;
}
} while (YES);
below code is entryByReencodingNameInEntry method
NSDictionary * result;
NSString * name;
NSData * nameData;
NSString * newName;
newName = nil;
// Try to get the name, convert it back to MacRoman, and then reconvert it
// with the preferred encoding.
name = [entry objectForKey:(id) kCFFTPResourceName];
if (name != nil) {
assert([name isKindOfClass:[NSString class]]);
nameData = [name dataUsingEncoding:NSMacOSRomanStringEncoding];
if (nameData != nil) {
newName = [[NSString alloc] initWithData:nameData encoding:newEncoding];
}
}
if (newName == nil) {
assert(NO); // in the debug builds, if this fails, we should investigate why
result = (NSDictionary *) entry;
} else {
NSMutableDictionary * newEntry;
newEntry = [entry mutableCopy];
assert(newEntry != nil);
[newEntry setObject:newName forKey:(id) kCFFTPResourceName];
result = newEntry;
}
return result;
for example,
if a folder has 3 files
애플.txt, 삼성.txt, 테스트.txt -> converted to ??.txt, ??.txt, ???.txt