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https://github.com/PurpleI2P/i2pd
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base64 added
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base64.cpp
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231
base64.cpp
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#include <stdlib.h>
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#include "base64.h"
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namespace i2p
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{
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namespace data
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{
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static void iT64Build(void);
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/*
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*
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* BASE64 Substitution Table
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* -------------------------
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*
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* Direct Substitution Table
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*/
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static char T64[64] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z', '0', '1', '2', '3',
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'4', '5', '6', '7', '8', '9', '-', '~'
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};
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/*
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* Reverse Substitution Table (built in run time)
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*/
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static char iT64[256];
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static int isFirstTime = 1;
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/*
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* Padding
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*/
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static char P64 = '=';
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/*
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*
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* ByteStreamToBase64
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* ------------------
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*
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* Converts binary encoded data to BASE64 format.
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*
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*/
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size_t /* Number of bytes in the encoded buffer */
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ByteStreamToBase64 (
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const uint8_t * InBuffer, /* Input buffer, binary data */
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size_t InCount, /* Number of bytes in the input buffer */
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char * OutBuffer, /* output buffer */
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size_t len /* length of output buffer */
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)
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{
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unsigned char * ps;
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unsigned char * pd;
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unsigned char acc_1;
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unsigned char acc_2;
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int i;
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int n;
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int m;
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size_t outCount;
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ps = (unsigned char *)InBuffer;
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n = InCount/3;
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m = InCount%3;
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if (!m)
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outCount = 4*n;
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else
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outCount = 4*(n+1);
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if (outCount > len) return -1;
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pd = (unsigned char *)OutBuffer;
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for ( i = 0; i<n; i++ ){
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acc_1 = *ps++;
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acc_2 = (acc_1<<4)&0x30;
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acc_1 >>= 2; /* base64 digit #1 */
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*pd++ = T64[acc_1];
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acc_1 = *ps++;
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acc_2 |= acc_1 >> 4; /* base64 digit #2 */
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*pd++ = T64[acc_2];
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acc_1 &= 0x0f;
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acc_1 <<=2;
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acc_2 = *ps++;
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acc_1 |= acc_2>>6; /* base64 digit #3 */
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*pd++ = T64[acc_1];
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acc_2 &= 0x3f; /* base64 digit #4 */
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*pd++ = T64[acc_2];
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}
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if ( m == 1 ){
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acc_1 = *ps++;
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acc_2 = (acc_1<<4)&0x3f; /* base64 digit #2 */
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acc_1 >>= 2; /* base64 digit #1 */
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*pd++ = T64[acc_1];
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*pd++ = T64[acc_2];
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*pd++ = P64;
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*pd++ = P64;
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}
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else if ( m == 2 ){
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acc_1 = *ps++;
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acc_2 = (acc_1<<4)&0x3f;
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acc_1 >>= 2; /* base64 digit #1 */
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*pd++ = T64[acc_1];
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acc_1 = *ps++;
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acc_2 |= acc_1 >> 4; /* base64 digit #2 */
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*pd++ = T64[acc_2];
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acc_1 &= 0x0f;
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acc_1 <<=2; /* base64 digit #3 */
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*pd++ = T64[acc_1];
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*pd++ = P64;
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}
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return outCount;
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}
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/*
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*
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* Base64ToByteStream
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* ------------------
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*
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* Converts BASE64 encoded data to binary format. If input buffer is
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* not properly padded, buffer of negative length is returned
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*
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*/
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size_t /* Number of output bytes */
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Base64ToByteStream (
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const char * InBuffer, /* BASE64 encoded buffer */
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size_t InCount, /* Number of input bytes */
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uint8_t * OutBuffer, /* output buffer length */
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size_t len /* length of output buffer */
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)
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{
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unsigned char * ps;
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unsigned char * pd;
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unsigned char acc_1;
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unsigned char acc_2;
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int i;
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int n;
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int m;
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size_t outCount;
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if (isFirstTime) iT64Build();
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n = InCount/4;
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m = InCount%4;
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if (!m)
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outCount = 3*n;
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else {
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outCount = 0;
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return -1;
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}
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ps = (unsigned char *)(InBuffer + InCount - 1);
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while ( *ps-- == P64 ) outCount--;
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ps = (unsigned char *)InBuffer;
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if (outCount > len) return -1;
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pd = (unsigned char *)OutBuffer;
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for ( i = 0; i < n; i++ ){
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acc_1 = iT64[*ps++];
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acc_2 = iT64[*ps++];
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acc_1 <<= 2;
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acc_1 |= acc_2>>4;
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*pd++ = acc_1;
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acc_2 <<= 4;
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acc_1 = iT64[*ps++];
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acc_2 |= acc_1 >> 2;
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*pd++ = acc_2;
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acc_2 = iT64[*ps++];
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acc_2 |= acc_1 << 6;
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*pd++ = acc_2;
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}
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return outCount;
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}
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/*
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*
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* iT64
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* ----
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* Reverse table builder. P64 character is replaced with 0
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*
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*
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*/
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static void iT64Build()
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{
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int i;
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isFirstTime = 0;
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for ( i=0; i<256; i++ ) iT64[i] = -1;
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for ( i=0; i<64; i++ ) iT64[(int)T64[i]] = i;
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iT64[(int)P64] = 0;
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}
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size_t Base32ToByteStream (const char * inBuf, size_t len, uint8_t * outBuf, size_t outLen)
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{
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int tmp = 0, bits = 0;
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size_t ret = 0;
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for (size_t i = 0; i < len; i++)
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{
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char ch = inBuf[i];
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if (ch >= '2' && ch <= '7') // digit
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ch = (ch - '2') + 26; // 26 means a-z
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else if (ch >= 'a' && ch <= 'z')
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ch = ch - 'a'; // a = 0
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else
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return 0; // unexpected character
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tmp |= ch;
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bits += 5;
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if (bits >= 8)
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{
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if (ret >= outLen) return ret;
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outBuf[ret] = tmp >> (bits - 8);
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bits -= 8;
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ret++;
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}
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tmp <<= 5;
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}
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return ret;
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}
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}
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}
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21
base64.h
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21
base64.h
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@ -0,0 +1,21 @@
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#ifndef BASE64_H
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#define BASE64_H
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#include <inttypes.h>
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#include <string.h>
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namespace i2p
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{
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namespace data
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{
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size_t ByteStreamToBase64 (const uint8_t * InBuffer, size_t InCount, char * OutBuffer, size_t len);
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size_t Base64ToByteStream (const char * InBuffer, size_t InCount, uint8_t * OutBuffer, size_t len );
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size_t Base32ToByteStream (const char * inBuf, size_t len, uint8_t * outBuf, size_t outLen);
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}
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}
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#endif
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