NSDataAdditions （BASE64 ZIP..)
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#import "NSDataAdditions.h"#import @implementation NSData (NSDataAdditions)// ================================================================================================// Created by Tom Bradley on 21/10/2009.// Version 1.4// // Copyright (c) 2009 Tom Bradley// // Permission is hereby granted, free of charge, to any person obtaining a copy// of this software and associated documentation files (the "Software"), to deal// in the Software without restriction, including without limitation the rights// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell// copies of the Software, and to permit persons to whom the Software is// furnished to do so, subject to the following conditions:// // The above copyright notice and this permission notice shall be included in// all copies or substantial portions of the Software.// // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN// THE SOFTWARE.// ================================================================================================+ (NSData *) dataWithUncompressedContentsOfFile:(NSString *)aFile { NSData * result; if ([[aFile pathExtension] isEqualToString:@"gz"]) { NSData * compressedData = [NSData dataWithContentsOfFile:aFile]; result = [compressedData gzipInflate]; } else result = [NSData dataWithContentsOfFile:aFile]; return result;}// ================================================================================================// base64.m// ViewTransitions//// Created by Neo on 5/11/08.// Copyright 2008 Kaliware, LLC. All rights reserved.//// Created by khammond on Mon Oct 29 2001.// Formatted by Timothy Hatcher on Sun Jul 4 2004.// Copyright (c) 2001 Kyle Hammond. All rights reserved.// Original development by Dave Winer.//// FOUND HERE http://idevkit.com/forums/tutorials-code-samples-sdk/8-nsdata-base64-extension.html// ================================================================================================static char encodingTable[64] = { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P', 'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f', 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v', 'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' };+ (NSData *) dataWithBase64EncodedString:(NSString *) string { NSData *result = [[NSData alloc] initWithBase64EncodedString:string]; return [result autorelease];}- (id) initWithBase64EncodedString:(NSString *) string { NSMutableData *mutableData = nil; if( string ) { unsigned long ixtext = 0; unsigned long lentext = 0; unsigned char ch = 0; unsigned char inbuf[4], outbuf[3]; short i = 0, ixinbuf = 0; BOOL flignore = NO; BOOL flendtext = NO; NSData *base64Data = nil; const unsigned char *base64Bytes = nil; // Convert the string to ASCII data. base64Data = [string dataUsingEncoding:NSASCIIStringEncoding]; base64Bytes = [base64Data bytes]; mutableData = [NSMutableData dataWithCapacity:[base64Data length]]; lentext = [base64Data length]; while( YES ) { if( ixtext >= lentext ) break; ch = base64Bytes[ixtext++]; flignore = NO; if( ( ch >= 'A' ) && ( ch <= 'Z' ) ) ch = ch - 'A'; else if( ( ch >= 'a' ) && ( ch <= 'z' ) ) ch = ch - 'a' + 26; else if( ( ch >= '0' ) && ( ch <= '9' ) ) ch = ch - '0' + 52; else if( ch == '+' ) ch = 62; else if( ch == '=' ) flendtext = YES; else if( ch == '/' ) ch = 63; else flignore = YES; if( ! flignore ) { short ctcharsinbuf = 3; BOOL flbreak = NO; if( flendtext ) { if( ! ixinbuf ) break; if( ( ixinbuf == 1 ) || ( ixinbuf == 2 ) ) ctcharsinbuf = 1; else ctcharsinbuf = 2; ixinbuf = 3; flbreak = YES; } inbuf [ixinbuf++] = ch; if( ixinbuf == 4 ) { ixinbuf = 0; outbuf [0] = ( inbuf[0] << 2 ) | ( ( inbuf[1] & 0x30) >> 4 ); outbuf [1] = ( ( inbuf[1] & 0x0F ) << 4 ) | ( ( inbuf[2] & 0x3C ) >> 2 ); outbuf [2] = ( ( inbuf[2] & 0x03 ) << 6 ) | ( inbuf[3] & 0x3F ); for( i = 0; i < ctcharsinbuf; i++ ) [mutableData appendBytes:&outbuf[i] length:1]; } if( flbreak ) break; } } } self = [self initWithData:mutableData]; return self;}#pragma mark -- (NSString *) base64Encoding { return [self base64EncodingWithLineLength:0];}- (NSString *) base64EncodingWithLineLength:(unsigned int) lineLength { const unsigned char *bytes = [self bytes]; NSMutableString *result = [NSMutableString stringWithCapacity:[self length]]; unsigned long ixtext = 0; unsigned long lentext = [self length]; long ctremaining = 0; unsigned char inbuf[3], outbuf[4]; short i = 0; short charsonline = 0, ctcopy = 0; unsigned long ix = 0; while( YES ) { ctremaining = lentext - ixtext; if( ctremaining <= 0 ) break; for( i = 0; i < 3; i++ ) { ix = ixtext + i; if( ix < lentext ) inbuf[i] = bytes[ix]; else inbuf [i] = 0; } outbuf [0] = (inbuf [0] & 0xFC) >> 2; outbuf [1] = ((inbuf [0] & 0x03) << 4) | ((inbuf [1] & 0xF0) >> 4); outbuf [2] = ((inbuf [1] & 0x0F) << 2) | ((inbuf [2] & 0xC0) >> 6); outbuf [3] = inbuf [2] & 0x3F; ctcopy = 4; switch( ctremaining ) { case 1: ctcopy = 2; break; case 2: ctcopy = 3; break; } for( i = 0; i < ctcopy; i++ ) [result appendFormat:@"%c", encodingTable[outbuf[i]]]; for( i = ctcopy; i < 4; i++ ) [result appendFormat:@"%c",'=']; ixtext += 3; charsonline += 4; if( lineLength > 0 ) { if (charsonline >= lineLength) { charsonline = 0; [result appendString:@"\n"]; } } } return result;}// ================================================================================================// NSData+gzip.m// Drip//// Created by Nur Monson on 8/21/07.// Copyright 2007 theidiotproject. All rights reserved.//// FOUND HERE http://code.google.com/p/drop-osx/source/browse/trunk/Source/NSData+gzip.m//// Also Check http://deusty.blogspot.com/2007/07/gzip-compressiondecompression.html// ================================================================================================#pragma mark -#pragma mark GZIP- (NSData *)gzipDeflate{ if ([self length] == 0) return self; z_stream strm; strm.zalloc = Z_NULL; strm.zfree = Z_NULL; strm.opaque = Z_NULL; strm.total_out = 0; strm.next_in=(Bytef *)[self bytes]; strm.avail_in = [self length]; // Compresssion Levels: // Z_NO_COMPRESSION // Z_BEST_SPEED // Z_BEST_COMPRESSION // Z_DEFAULT_COMPRESSION if (deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, (15+16), 8, Z_DEFAULT_STRATEGY) != Z_OK) return nil; NSMutableData *compressed = [NSMutableData dataWithLength:16384]; // 16K chunks for expansion do { if (strm.total_out >= [compressed length]) [compressed increaseLengthBy: 16384]; strm.next_out = [compressed mutableBytes] + strm.total_out; strm.avail_out = [compressed length] - strm.total_out; deflate(&strm, Z_FINISH); } while (strm.avail_out == 0); deflateEnd(&strm); [compressed setLength: strm.total_out]; return [NSData dataWithData:compressed];}- (NSData *)gzipInflate{ if ([self length] == 0) return self; unsigned full_length = [self length]; unsigned half_length = [self length] / 2; NSMutableData *decompressed = [NSMutableData dataWithLength: full_length + half_length]; BOOL done = NO; int status; z_stream strm; strm.next_in = (Bytef *)[self bytes]; strm.avail_in = [self length]; strm.total_out = 0; strm.zalloc = Z_NULL; strm.zfree = Z_NULL; if (inflateInit2(&strm, (15+32)) != Z_OK) return nil; while (!done) { // Make sure we have enough room and reset the lengths. if (strm.total_out >= [decompressed length]) [decompressed increaseLengthBy: half_length]; strm.next_out = [decompressed mutableBytes] + strm.total_out; strm.avail_out = [decompressed length] - strm.total_out; // Inflate another chunk. status = inflate (&strm, Z_SYNC_FLUSH); if (status == Z_STREAM_END) done = YES; else if (status != Z_OK) break; } if (inflateEnd (&strm) != Z_OK) return nil; // Set real length. if (done) { [decompressed setLength: strm.total_out]; return [NSData dataWithData: decompressed]; } else return nil;}@end 0 0
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