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//
// GTMNSData+zlib.h
//
// Copyright 2007-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import <Foundation/Foundation.h>
#import "GTMDefines.h"
/// Helpers for dealing w/ zlib inflate/deflate calls.
@interface NSData (GTMZLibAdditions)
// NOTE: For 64bit, none of these apis handle input sizes >32bits, they will
// return nil when given such data. To handle data of that size you really
// should be streaming it rather then doing it all in memory.
#pragma mark Gzip Compression
/// Return an autoreleased NSData w/ the result of gzipping the bytes.
//
// Uses the default compression level.
+ (NSData *)gtm_dataByGzippingBytes:(const void *)bytes
length:(NSUInteger)length;
/// Return an autoreleased NSData w/ the result of gzipping the payload of |data|.
//
// Uses the default compression level.
+ (NSData *)gtm_dataByGzippingData:(NSData *)data;
/// Return an autoreleased NSData w/ the result of gzipping the bytes using |level| compression level.
//
// |level| can be 1-9, any other values will be clipped to that range.
+ (NSData *)gtm_dataByGzippingBytes:(const void *)bytes
length:(NSUInteger)length
compressionLevel:(int)level;
/// Return an autoreleased NSData w/ the result of gzipping the payload of |data| using |level| compression level.
+ (NSData *)gtm_dataByGzippingData:(NSData *)data
compressionLevel:(int)level;
#pragma mark Zlib "Stream" Compression
// NOTE: deflate is *NOT* gzip. deflate is a "zlib" stream. pick which one
// you really want to create. (the inflate api will handle either)
/// Return an autoreleased NSData w/ the result of deflating the bytes.
//
// Uses the default compression level.
+ (NSData *)gtm_dataByDeflatingBytes:(const void *)bytes
length:(NSUInteger)length;
/// Return an autoreleased NSData w/ the result of deflating the payload of |data|.
//
// Uses the default compression level.
+ (NSData *)gtm_dataByDeflatingData:(NSData *)data;
/// Return an autoreleased NSData w/ the result of deflating the bytes using |level| compression level.
//
// |level| can be 1-9, any other values will be clipped to that range.
+ (NSData *)gtm_dataByDeflatingBytes:(const void *)bytes
length:(NSUInteger)length
compressionLevel:(int)level;
/// Return an autoreleased NSData w/ the result of deflating the payload of |data| using |level| compression level.
+ (NSData *)gtm_dataByDeflatingData:(NSData *)data
compressionLevel:(int)level;
#pragma mark Uncompress of Gzip or Zlib
/// Return an autoreleased NSData w/ the result of decompressing the bytes.
//
// The bytes to decompress can be zlib or gzip payloads.
+ (NSData *)gtm_dataByInflatingBytes:(const void *)bytes
length:(NSUInteger)length;
/// Return an autoreleased NSData w/ the result of decompressing the payload of |data|.
//
// The data to decompress can be zlib or gzip payloads.
+ (NSData *)gtm_dataByInflatingData:(NSData *)data;
#pragma mark "Raw" Compression Support
// NOTE: raw deflate is *NOT* gzip or deflate. it does not include a header
// of any form and should only be used within streams here an external crc/etc.
// is done to validate the data. The RawInflate apis can be used on data
// processed like this.
/// Return an autoreleased NSData w/ the result of *raw* deflating the bytes.
//
// Uses the default compression level.
// *No* header is added to the resulting data.
+ (NSData *)gtm_dataByRawDeflatingBytes:(const void *)bytes
length:(NSUInteger)length;
/// Return an autoreleased NSData w/ the result of *raw* deflating the payload of |data|.
//
// Uses the default compression level.
// *No* header is added to the resulting data.
+ (NSData *)gtm_dataByRawDeflatingData:(NSData *)data;
/// Return an autoreleased NSData w/ the result of *raw* deflating the bytes using |level| compression level.
//
// |level| can be 1-9, any other values will be clipped to that range.
// *No* header is added to the resulting data.
+ (NSData *)gtm_dataByRawDeflatingBytes:(const void *)bytes
length:(NSUInteger)length
compressionLevel:(int)level;
/// Return an autoreleased NSData w/ the result of *raw* deflating the payload of |data| using |level| compression level.
// *No* header is added to the resulting data.
+ (NSData *)gtm_dataByRawDeflatingData:(NSData *)data
compressionLevel:(int)level;
/// Return an autoreleased NSData w/ the result of *raw* decompressing the bytes.
//
// The data to decompress, it should *not* have any header (zlib nor gzip).
+ (NSData *)gtm_dataByRawInflatingBytes:(const void *)bytes
length:(NSUInteger)length;
/// Return an autoreleased NSData w/ the result of *raw* decompressing the payload of |data|.
//
// The data to decompress, it should *not* have any header (zlib nor gzip).
+ (NSData *)gtm_dataByRawInflatingData:(NSData *)data;
@end
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