// // NSData+Common.m // CommonLibrary // // Created by Alexi on 13-11-6. // Copyright (c) 2013年 ywchen. All rights reserved. // //#if kSupportNSDataCommon #import "NSData+Common.h" #import #define xx 65 // // Mapping from ASCII character to 6 bit pattern. // static unsigned char base64EncodeLookup[256] = { xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, 62, xx, xx, xx, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, xx, xx, xx, xx, xx, xx, xx, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, xx, xx, xx, xx, xx, xx, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, }; // // Fundamental sizes of the binary and base64 encode/decode units in bytes // #define BINARY_UNIT_SIZE 3 #define BASE64_UNIT_SIZE 4 void *NewBase64Decode(const char *inputBuffer, size_t length, size_t *outputLength) { if (length == (size_t)-1) { length = strlen(inputBuffer); } size_t outputBufferSize = ((length+BASE64_UNIT_SIZE-1) / BASE64_UNIT_SIZE) * BINARY_UNIT_SIZE; unsigned char *outputBuffer = (unsigned char *)malloc(outputBufferSize); size_t i = 0; size_t j = 0; while (i < length) { // // Accumulate 4 valid characters (ignore everything else) // unsigned char accumulated[BASE64_UNIT_SIZE]; size_t accumulateIndex = 0; while (i < length) { unsigned char decode = base64EncodeLookup[inputBuffer[i++]]; if (decode != xx) { accumulated[accumulateIndex] = decode; accumulateIndex++; if (accumulateIndex == BASE64_UNIT_SIZE) { break; } } } // // Store the 6 bits from each of the 4 characters as 3 bytes // // (Uses improved bounds checking suggested by Alexandre Colucci) // if(accumulateIndex >= 2) outputBuffer[j] = (unsigned char)(accumulated[0] << 2) | (accumulated[1] >> 4); if(accumulateIndex >= 3) outputBuffer[j + 1] = (unsigned char)(accumulated[1] << 4) | (accumulated[2] >> 2); if(accumulateIndex >= 4) outputBuffer[j + 2] = (unsigned char)(accumulated[2] << 6) | accumulated[3]; j += accumulateIndex - 1; } if (outputLength) { *outputLength = j; } return outputBuffer; } // // NewBase64Encode // // Encodes the arbitrary data in the inputBuffer as base64 into a newly malloced // output buffer. // // inputBuffer - the source data for the encode // length - the length of the input in bytes // separateLines - if zero, no CR/LF characters will be added. Otherwise // a CR/LF pair will be added every 64 encoded chars. // outputLength - if not-NULL, on output will contain the encoded length // (not including terminating 0 char) // // returns the encoded buffer. Must be free'd by caller. Length is given by // outputLength. // char *NewBase64Encode(const void *buffer, size_t length, bool separateLines, size_t *outputLength) { const unsigned char *inputBuffer = (const unsigned char *)buffer; #define MAX_NUM_PADDING_CHARS 2 #define OUTPUT_LINE_LENGTH 64 #define INPUT_LINE_LENGTH ((OUTPUT_LINE_LENGTH / BASE64_UNIT_SIZE) * BINARY_UNIT_SIZE) #define CR_LF_SIZE 2 // // Byte accurate calculation of final buffer size // size_t outputBufferSize = ((length / BINARY_UNIT_SIZE) + ((length % BINARY_UNIT_SIZE) ? 1 : 0)) * BASE64_UNIT_SIZE; if (separateLines) { outputBufferSize += (outputBufferSize / OUTPUT_LINE_LENGTH) * CR_LF_SIZE; } // // Include space for a terminating zero // outputBufferSize += 1; // // Allocate the output buffer // char *outputBuffer = (char *)malloc(outputBufferSize); if (!outputBuffer) { return NULL; } size_t i = 0; size_t j = 0; const size_t lineLength = separateLines ? INPUT_LINE_LENGTH : length; size_t lineEnd = lineLength; while (true) { if (lineEnd > length) { lineEnd = length; } for (; i + BINARY_UNIT_SIZE - 1 < lineEnd; i += BINARY_UNIT_SIZE) { // // Inner loop: turn 48 bytes into 64 base64 characters // outputBuffer[j++] = (char)base64EncodeLookup[(inputBuffer[i] & 0xFC) >> 2]; outputBuffer[j++] = (char)base64EncodeLookup[((inputBuffer[i] & 0x03) << 4) | ((inputBuffer[i + 1] & 0xF0) >> 4)]; outputBuffer[j++] = (char)base64EncodeLookup[((inputBuffer[i + 1] & 0x0F) << 2) | ((inputBuffer[i + 2] & 0xC0) >> 6)]; outputBuffer[j++] = (char)base64EncodeLookup[inputBuffer[i + 2] & 0x3F]; } if (lineEnd == length) { break; } // // Add the newline // outputBuffer[j++] = '\r'; outputBuffer[j++] = '\n'; lineEnd += lineLength; } if (i + 1 < length) { // // Handle the single '=' case // outputBuffer[j++] = (char)base64EncodeLookup[(inputBuffer[i] & 0xFC) >> 2]; outputBuffer[j++] = (char)base64EncodeLookup[((inputBuffer[i] & 0x03) << 4) | ((inputBuffer[i + 1] & 0xF0) >> 4)]; outputBuffer[j++] = (char)base64EncodeLookup[(inputBuffer[i + 1] & 0x0F) << 2]; outputBuffer[j++] = '='; } else if (i < length) { // // Handle the double '=' case // outputBuffer[j++] = (char)base64EncodeLookup[(inputBuffer[i] & 0xFC) >> 2]; outputBuffer[j++] = (char)base64EncodeLookup[(inputBuffer[i] & 0x03) << 4]; outputBuffer[j++] = '='; outputBuffer[j++] = '='; } outputBuffer[j] = 0; // // Set the output length and return the buffer // if (outputLength) { *outputLength = j; } return outputBuffer; } @implementation NSData (Common) + (NSData *)dataFromBase64String:(NSString *)aString { NSData *data = [aString dataUsingEncoding:NSASCIIStringEncoding]; size_t outputLength; void *outputBuffer = NewBase64Decode([data bytes], [data length], &outputLength); NSData *result = [NSData dataWithBytes:outputBuffer length:outputLength]; free(outputBuffer); return result; } - (NSString *)base64EncodedString { size_t outputLength = 0; char *outputBuffer = NewBase64Encode([self bytes], [self length], false, &outputLength); NSString *result = [[NSString alloc] initWithBytes:outputBuffer length:outputLength encoding:NSASCIIStringEncoding]; free(outputBuffer); // return CommonReturnAutoReleased(result); return result; } /////////////////////////////////////////////////////////////////////////////////////////////////// /** * Calculate an md5 hash using CC_MD5. * * @returns The md5 hash of this data. */ - (NSString *)md5Hash { unsigned char result[CC_MD5_DIGEST_LENGTH]; CC_MD5([self bytes], (CC_LONG)[self length], result); return [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15] ]; } /////////////////////////////////////////////////////////////////////////////////////////////////// /** * Calculate the SHA1 hash using CC_SHA1. * * @returns The SHA1 hash of this data. */ - (NSString *)sha1Hash { unsigned char result[CC_SHA1_DIGEST_LENGTH]; CC_SHA1([self bytes], (CC_LONG)[self length], result); return [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15], result[16], result[17], result[18], result[19] ]; } @end //#endif