base64.cpp
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上传日期:2014-08-12
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文件大小:14k
源码类别:
金融证券系统
开发平台:
Visual C++
- /*
- B A S E 6 4. C P P
- Copyright (C) 2001 Balang SoftWare
- Version: 0.0.1
- */
- #include "stdafx.h"
- #include "base64.h"
- ///////////////////////////////////////////////////////////////////////////////////
- /// The usefull base64 encoder and decoder
- #define MAXLINE 76
- /*============================================================================
- * Everything below this line is private to this file (static)
- *============================================================================
- */
- static char base64tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
- "abcdefghijklmnopqrstuvwxyz0123456789+/";
- static char base64idx[128] = {
- '377','377','377','377','377','377','377','377',
- '377','377','377','377','377','377','377','377',
- '377','377','377','377','377','377','377','377',
- '377','377','377','377','377','377','377','377',
- '377','377','377','377','377','377','377','377',
- '377','377','377', 62,'377','377','377', 63,
- 52, 53, 54, 55, 56, 57, 58, 59,
- 60, 61,'377','377','377','377','377','377',
- '377', 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,'377','377','377','377','377',
- '377', 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,'377','377','377','377','377'
- };
- static char hextab[] = "0123456789ABCDEF";
- static char eol_string[] = "rn";
- #ifdef __cplusplus
- inline int isbase64(int a) {
- return ('A' <= a && a <= 'Z')
- || ('a' <= a && a <= 'z')
- || ('0' <= a && a <= '9')
- || a == '+' || a == '/';
- }
- #else
- #define isbase64(a) ( ('A' <= (a) && (a) <= 'Z')
- || ('a' <= (a) && (a) <= 'z')
- || ('0' <= (a) && (a) <= '9')
- || (a) == '+' || (a) == '/' )
- #endif
- int encode_base64(const char* aIn, size_t aInLen, char* aOut,
- size_t aOutSize, size_t* aOutLen)
- {
- size_t inLen = 0;
- char* out = 0;
- size_t outSize = 0;
- size_t inPos = 0;
- size_t outPos = 0;
- int c1, c2, c3;
- int lineLen = 0;
- size_t i;
- const char *cp = 0;
- if (!aIn || !aOut || !aOutLen)
- return -1;
- inLen = aInLen;
- out = aOut;
- outSize = (inLen+2)/3*4; /* 3:4 conversion ratio */
- outSize += strlen(eol_string)*outSize/MAXLINE + 2; /* Space for newlines and NUL */
- if (aOutSize < outSize)
- return -1;
- /* Get three characters at a time and encode them. */
- for (i=0; i < inLen/3; ++i) {
- c1 = aIn[inPos++] & 0xFF;
- c2 = aIn[inPos++] & 0xFF;
- c3 = aIn[inPos++] & 0xFF;
- out[outPos++] = base64tab[(c1 & 0xFC) >> 2];
- out[outPos++] = base64tab[((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4)];
- out[outPos++] = base64tab[((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6)];
- out[outPos++] = base64tab[c3 & 0x3F];
- lineLen += 4;
- if (lineLen >= MAXLINE-3) {
- cp = eol_string;
- out[outPos++] = *cp++;
- if (*cp) {
- out[outPos++] = *cp;
- }
- lineLen = 0;
- }
- }
- /* Encode the remaining one or two characters. */
- switch (inLen % 3) {
- case 0:
- cp = eol_string;
- out[outPos++] = *cp++;
- if (*cp) {
- out[outPos++] = *cp;
- }
- break;
- case 1:
- c1 = aIn[inPos] & 0xFF;
- out[outPos++] = base64tab[(c1 & 0xFC) >> 2];
- out[outPos++] = base64tab[((c1 & 0x03) << 4)];
- out[outPos++] = '=';
- out[outPos++] = '=';
- cp = eol_string;
- out[outPos++] = *cp++;
- if (*cp) {
- out[outPos++] = *cp;
- }
- break;
- case 2:
- c1 = aIn[inPos++] & 0xFF;
- c2 = aIn[inPos] & 0xFF;
- out[outPos++] = base64tab[(c1 & 0xFC) >> 2];
- out[outPos++] = base64tab[((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4)];
- out[outPos++] = base64tab[((c2 & 0x0F) << 2)];
- out[outPos++] = '=';
- cp = eol_string;
- out[outPos++] = *cp++;
- if (*cp) {
- out[outPos++] = *cp;
- }
- break;
- }
- out[outPos] = 0;
- *aOutLen = outPos;
- return 0;
- }
- int decode_base64(const char* aIn, size_t aInLen, char* aOut,
- size_t aOutSize, size_t* aOutLen)
- {
- size_t inLen = 0;
- char * out = 0;
- size_t outSize = 0;
- int isErr = 0;
- int isEndSeen = 0;
- int b1, b2, b3;
- int a1, a2, a3, a4;
- size_t inPos = 0;
- size_t outPos = 0;
- if (!aIn || !aOut || !aOutLen)
- return -1;
- inLen = aInLen;
- out = aOut;
- outSize = (inLen+3)/4*3;
- if (aOutSize < outSize)
- return -1;
- /* Get four input chars at a time and decode them. Ignore white space
- * chars (CR, LF, SP, HT). If '=' is encountered, terminate input. If
- * a char other than white space, base64 char, or '=' is encountered,
- * flag an input error, but otherwise ignore the char.
- */
- while (inPos < inLen) {
- a1 = a2 = a3 = a4 = 0;
- while (inPos < inLen) {
- a1 = aIn[inPos++] & 0xFF;
- if (isbase64(a1)) {
- break;
- }
- else if (a1 == '=') {
- isEndSeen = 1;
- break;
- }
- else if (a1 != 'r' && a1 != 'n' && a1 != ' ' && a1 != 't') {
- isErr = 1;
- }
- }
- while (inPos < inLen) {
- a2 = aIn[inPos++] & 0xFF;
- if (isbase64(a2)) {
- break;
- }
- else if (a2 == '=') {
- isEndSeen = 1;
- break;
- }
- else if (a2 != 'r' && a2 != 'n' && a2 != ' ' && a2 != 't') {
- isErr = 1;
- }
- }
- while (inPos < inLen) {
- a3 = aIn[inPos++] & 0xFF;
- if (isbase64(a3)) {
- break;
- }
- else if (a3 == '=') {
- isEndSeen = 1;
- break;
- }
- else if (a3 != 'r' && a3 != 'n' && a3 != ' ' && a3 != 't') {
- isErr = 1;
- }
- }
- while (inPos < inLen) {
- a4 = aIn[inPos++] & 0xFF;
- if (isbase64(a4)) {
- break;
- }
- else if (a4 == '=') {
- isEndSeen = 1;
- break;
- }
- else if (a4 != 'r' && a4 != 'n' && a4 != ' ' && a4 != 't') {
- isErr = 1;
- }
- }
- if (isbase64(a1) && isbase64(a2) && isbase64(a3) && isbase64(a4)) {
- a1 = base64idx[a1] & 0xFF;
- a2 = base64idx[a2] & 0xFF;
- a3 = base64idx[a3] & 0xFF;
- a4 = base64idx[a4] & 0xFF;
- b1 = ((a1 << 2) & 0xFC) | ((a2 >> 4) & 0x03);
- b2 = ((a2 << 4) & 0xF0) | ((a3 >> 2) & 0x0F);
- b3 = ((a3 << 6) & 0xC0) | ( a4 & 0x3F);
- out[outPos++] = (char)(b1);
- out[outPos++] = (char)(b2);
- out[outPos++] = (char)(b3);
- }
- else if (isbase64(a1) && isbase64(a2) && isbase64(a3) && a4 == '=') {
- a1 = base64idx[a1] & 0xFF;
- a2 = base64idx[a2] & 0xFF;
- a3 = base64idx[a3] & 0xFF;
- b1 = ((a1 << 2) & 0xFC) | ((a2 >> 4) & 0x03);
- b2 = ((a2 << 4) & 0xF0) | ((a3 >> 2) & 0x0F);
- out[outPos++] = (char)(b1);
- out[outPos++] = (char)(b2);
- break;
- }
- else if (isbase64(a1) && isbase64(a2) && a3 == '=' && a4 == '=') {
- a1 = base64idx[a1] & 0xFF;
- a2 = base64idx[a2] & 0xFF;
- b1 = ((a1 << 2) & 0xFC) | ((a2 >> 4) & 0x03);
- out[outPos++] = (char)(b1);
- break;
- }
- else {
- break;
- }
- if (isEndSeen) {
- break;
- }
- } /* end while loop */
- *aOutLen = outPos;
- return (isErr) ? -1 : 0;
- }
- int EncodeBase64( CString &strSrc, CString &strDest )
- {
- size_t destSize = 4*(strSrc.GetLength()+2)/3;
- destSize += strlen("rn")*destSize/72 + 2;
- destSize += 64; /*64; a little extra room */
- /* Allocate destination buffer */
- char * destBuf = strDest.GetBuffer(destSize);
- if( 0 == destBuf )
- {
- strDest.ReleaseBuffer();
- return FALSE;
- }
- /* Encode source to destination */
- size_t destLen = 0;
- int result = encode_base64(strSrc, strSrc.GetLength(), destBuf, destSize, &destLen);
- if( destLen < destSize )
- destBuf[destLen] = ' ';
- strDest.ReleaseBuffer();
- return strDest.GetLength();
- }
- int DecodeBase64( CString &strSrc, CString &strDest )
- {
- size_t destSize = 4*(strSrc.GetLength()+2)/3;
- destSize += strlen("rn")*destSize/72 + 2;
- destSize += 64; /*64; a little extra room */
- /* Allocate destination buffer */
- char * destBuf = strDest.GetBuffer(destSize);
- if( 0 == destBuf )
- {
- strDest.ReleaseBuffer();
- return FALSE;
- }
- /* Encode source to destination */
- size_t destLen = 0;
- int result = decode_base64(strSrc, strSrc.GetLength(), destBuf, destSize, &destLen);
- if( destLen < destSize )
- destBuf[destLen] = ' ';
- strDest.ReleaseBuffer();
- return strDest.GetLength();
- }
- //////////////////////////////////////////////////////////////////////////
- // CRC32 and CRC16
- static unsigned int crc_32_tab[] = {
- 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
- 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
- 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
- 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
- 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
- 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
- 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
- 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
- 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
- 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
- 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
- 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
- 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
- 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
- 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
- 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
- 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
- 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
- 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
- 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
- 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
- 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
- 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
- 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
- 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
- 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
- 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
- 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
- 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
- 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
- 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
- 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
- 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
- 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
- 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
- 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
- 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
- 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
- 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
- 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
- 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
- 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
- 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
- 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
- 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
- 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
- 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
- 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
- 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
- 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
- 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
- 0x2d02ef8dL
- };
- unsigned int CRC32(char *s, int len)
- {
- register unsigned c;
- unsigned int crc = (unsigned int)0xffffffffL;
- if (s == 0)
- {
- c = 0xffffffffL;
- }
- else
- {
- c = crc;
- if(len)
- {
- do
- {
- c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
- } while (--len);
- }
- }
- crc = c;
- return c ^ 0xffffffffL;
- }
- WORD CRC16(unsigned char *info, DWORD len)
- {
- WORD acc;
- unsigned char i;
- acc=0;
- while( len-- )
- {
- acc=acc^(((unsigned int)(*info))<<8);
- info++;
- for( i=8; i>0; i-- )
- {
- if (acc&0x8000)
- acc=(acc<<1)^0x1021;
- else acc<<=1;
- }
- }
- return acc;
- }