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Base64.cpp
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Base64.cpp
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#include "stdafx.h"
#include "Base64.h"
static const char *g_pCodes =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
static const unsigned char g_pMap[256] =
{
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
255, 254, 255, 255, 255, 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, 255, 255, 255, 255, 255,
255, 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, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255
};
CBase64::CBase64()
{
}
CBase64::~CBase64()
{
}
bool CBase64::Encode(const unsigned char *pIn, unsigned long uInLen, unsigned char *pOut, unsigned long *uOutLen)
{
unsigned long i, len2, leven;
unsigned char *p;
if (pOut == NULL || *uOutLen == 0)
return false;
//ASSERT((pIn != NULL) && (uInLen != 0) && (pOut != NULL) && (uOutLen != NULL));
len2 = ((uInLen + 2) / 3) << 2;
if ((*uOutLen) < (len2 + 1)) return false;
p = pOut;
leven = 3 * (uInLen / 3);
for (i = 0; i < leven; i += 3)
{
*p++ = g_pCodes[pIn[0] >> 2];
*p++ = g_pCodes[((pIn[0] & 3) << 4) + (pIn[1] >> 4)];
*p++ = g_pCodes[((pIn[1] & 0xf) << 2) + (pIn[2] >> 6)];
*p++ = g_pCodes[pIn[2] & 0x3f];
pIn += 3;
}
if (i < uInLen)
{
unsigned char a = pIn[0];
unsigned char b = ((i + 1) < uInLen) ? pIn[1] : 0;
unsigned char c = 0;
*p++ = g_pCodes[a >> 2];
*p++ = g_pCodes[((a & 3) << 4) + (b >> 4)];
*p++ = ((i + 1) < uInLen) ? g_pCodes[((b & 0xf) << 2) + (c >> 6)] : '=';
*p++ = '=';
}
*p = 0; // Append NULL byte
*uOutLen = p - pOut;
return true;
}
bool CBase64::Encode(const unsigned char *pIn, unsigned long uInLen, string& strOut)
{
unsigned long i, len2, leven;
strOut = "";
//ASSERT((pIn != NULL) && (uInLen != 0) && (pOut != NULL) && (uOutLen != NULL));
len2 = ((uInLen + 2) / 3) << 2;
//if((*uOutLen) < (len2 + 1)) return false;
//p = pOut;
leven = 3 * (uInLen / 3);
for (i = 0; i < leven; i += 3)
{
strOut += g_pCodes[pIn[0] >> 2];
strOut += g_pCodes[((pIn[0] & 3) << 4) + (pIn[1] >> 4)];
strOut += g_pCodes[((pIn[1] & 0xf) << 2) + (pIn[2] >> 6)];
strOut += g_pCodes[pIn[2] & 0x3f];
pIn += 3;
}
if (i < uInLen)
{
unsigned char a = pIn[0];
unsigned char b = ((i + 1) < uInLen) ? pIn[1] : 0;
unsigned char c = 0;
strOut += g_pCodes[a >> 2];
strOut += g_pCodes[((a & 3) << 4) + (b >> 4)];
strOut += ((i + 1) < uInLen) ? g_pCodes[((b & 0xf) << 2) + (c >> 6)] : '=';
strOut += '=';
}
//*p = 0; // Append NULL byte
//*uOutLen = p - pOut;
return true;
}
bool CBase64::Decode(const unsigned char *pIn, unsigned long uInLen, unsigned char *pOut, unsigned long *uOutLen)
{
unsigned long t, x, y, z;
unsigned char c;
unsigned long g = 3;
//ASSERT((pIn != NULL) && (uInLen != 0) && (pOut != NULL) && (uOutLen != NULL));
for (x = y = z = t = 0; x < uInLen; x++)
{
c = g_pMap[pIn[x]];
if (c == 255) continue;
if (c == 254) { c = 0; g--; }
t = (t << 6) | c;
if (++y == 4)
{
if ((z + g) > *uOutLen) { return false; } // Buffer overflow
pOut[z++] = (unsigned char)((t >> 16) & 255);
if (g > 1) pOut[z++] = (unsigned char)((t >> 8) & 255);
if (g > 2) pOut[z++] = (unsigned char)(t & 255);
y = t = 0;
}
}
*uOutLen = z;
return true;
}