text: //
  //  ASIDataCompressor.h
  //  Part of ASIHTTPRequest -> http://allseeing-i.com/ASIHTTPRequest
  //
  //  Created by Ben Copsey on 17/08/2010.
  //  Copyright 2010 All-Seeing Interactive. All rights reserved.
  //
  
  // This is a helper class used by ASIHTTPRequest to handle deflating (compressing) data in memory and on disk
  // You may also find it helpful if you need to deflate data and files yourself - see the class methods below
  // Most of the zlib stuff is based on the sample code by Mark Adler available at http://zlib.net
  
  #import <Foundation/Foundation.h>
  #import <zlib.h>
  
  @interface ASIDataCompressor : NSObject {
  	BOOL streamReady;
  	z_stream zStream;
  }
  
  // Convenience constructor will call setupStream for you
  + (id)compressor;
  
  // Compress the passed chunk of data
  // Passing YES for shouldFinish will finalize the deflated data - you must pass YES when you are on the last chunk of data
  - (NSData *)compressBytes:(Bytef *)bytes length:(NSUInteger)length error:(NSError **)err shouldFinish:(BOOL)shouldFinish;
  
  // Convenience method - pass it some data, and you'll get deflated data back
  + (NSData *)compressData:(NSData*)uncompressedData error:(NSError **)err;
  
  // Convenience method - pass it a file containing the data to compress in sourcePath, and it will write deflated data to destinationPath
  + (BOOL)compressDataFromFile:(NSString *)sourcePath toFile:(NSString *)destinationPath error:(NSError **)err;
  
  // Sets up zlib to handle the inflating. You only need to call this yourself if you aren't using the convenience constructor 'compressor'
  - (NSError *)setupStream;
  
  // Tells zlib to clean up. You need to call this if you need to cancel deflating part way through
  // If deflating finishes or fails, this method will be called automatically
  - (NSError *)closeStream;
  
  @property (assign, readonly) BOOL streamReady;
  @end
  