> There's a handy NSData-Compression class in Dustin Mierau's NetSocket
> 0.9 sample code available here:
>
> http://blackholemedia.com/code/
>
> Here's a snippet from the header file.
>
> @interface NSData (Compression)
> - (NSData*)compressedData;
> - (NSData*)compressedDataWithLevel:(int)inLevel;
> - (NSData*)uncompressedData;
> @end
>
> @interface NSMutableData (Compression)
> - (BOOL)compress;
> - (BOOL)uncompress;
> @end
This code (from above) appears to leak:
- (NSData*)compressedDataWithLevel:(int)inLevel
{
Bytef* data = (Bytef*)[self bytes];
uLongf originalLength = [self length];
uLongf bufferLength = ( [self length] * 1.1 ) + 16;
Bytef* buffer;
int err;
if( inLevel > NSDataCompressionBest )
inLevel = NSDataCompressionBest;
if( inLevel < Z_DEFAULT_COMPRESSION )
inLevel = NSDataCompressionNone;
buffer = (Bytef*)malloc( (uInt)bufferLength );
err = compress2( buffer, &bufferLength, (const Bytef*)data, [self
length], inLevel );
if( err != Z_OK )
{
free( buffer );
return nil;
}
bcopy( buffer, buffer + sizeof( uLongf ), bufferLength );
bcopy( (void*)&originalLength, buffer, sizeof( uLongf ) );
return [NSData dataWithBytesNoCopy:buffer length:bufferLength + sizeof(
uLongf )];
}
If the compression is successful, and I later release the (compressed)
NSData, buffer is still around, right?
Is there an update to this code?
How could I add buffer to a pool of sorts to be released when the object is
released as it is just malloc'd.
Thanks,
Trygve
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