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base64.cpp
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473 lines (381 loc) · 8.18 KB
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/**
* @file base64.cpp
* @brief modified base64 encoding/decoding
*
* (c) 2013-2014 by Mega Limited, Auckland, New Zealand
*
* This file is part of the MEGA SDK - Client Access Engine.
*
* Applications using the MEGA API must present a valid application key
* and comply with the the rules set forth in the Terms of Service.
*
* The MEGA SDK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* @copyright Simplified (2-clause) BSD License.
*
* You should have received a copy of the license along with this
* program.
*/
#include "mega/base64.h"
namespace mega {
// modified base64 conversion (no trailing '=' and '-_' instead of '+/')
unsigned char Base64::to64(byte c)
{
c &= 63;
if (c < 26)
{
return c + 'A';
}
if (c < 52)
{
return c - 26 + 'a';
}
if (c < 62)
{
return c - 52 + '0';
}
if (c == 62)
{
return '-';
}
return '_';
}
unsigned char Base64::from64(byte c)
{
if ((c >= 'A') && (c <= 'Z'))
{
return c - 'A';
}
if ((c >= 'a') && (c <= 'z'))
{
return c - 'a' + 26;
}
if ((c >= '0') && (c <= '9'))
{
return c - '0' + 52;
}
if (c == '-' || c == '+')
{
return 62;
}
if (c == '_' || c == '/')
{
return 63;
}
return 255;
}
int Base64::atob(const string &in, string &out)
{
out.resize(in.size() * 3 / 4 + 3);
out.resize(Base64::atob(in.data(), (byte *) out.data(), (int)out.size()));
return (int)out.size();
}
std::string Base64::atob(const std::string &in)
{
string out;
out.resize(in.size() * 3 / 4 + 3);
out.resize(Base64::atob(in.data(), (byte *) out.data(), (int)out.size()));
return out;
}
int Base64::atob(const char* a, byte* b, int blen)
{
byte c[4];
int i;
int p = 0;
c[3] = 0;
for (;;)
{
for (i = 0; i < 4; i++)
{
if ((c[i] = from64(*a++)) == 255)
{
break;
}
}
if ((p >= blen) || !i)
{
return p;
}
b[p++] = (c[0] << 2) | ((c[1] & 0x30) >> 4);
if ((p >= blen) || (i < 3))
{
return p;
}
b[p++] = (c[1] << 4) | ((c[2] & 0x3c) >> 2);
if ((p >= blen) || (i < 4))
{
return p;
}
b[p++] = (c[2] << 6) | c[3];
}
}
void Base64::itoa(int64_t val, string *result)
{
byte c;
int64_t rest;
if (!result || val < 0)
{
return;
}
if (!val)
{
*result = "A";
return;
}
result->clear();
while (val)
{
rest = val % 64;
val /= 64;
c = to64(byte(rest));
result->insert(result->begin(), (char) c);
}
}
int64_t Base64::atoi(string *val)
{
if (!val)
{
return -1;
}
size_t len = val->size();
if (len == 0)
{
return -1;
}
size_t pos = 0;
int64_t res = 0;
int valid = 0;
while (pos < len)
{
byte b = from64(val->at(pos));
if (b == 255)
{
pos++;
continue;
}
valid++;
res *= 64;
res += b;
pos++;
}
if (!valid || res < 0)
{
return -1;
}
return res;
}
int Base64::btoa(const string &in, string &out)
{
out.resize(in.size() * 4 / 3 + 4);
out.resize(Base64::btoa((const byte*) in.data(), (int)in.size(), (char *) out.data()));
return (int)out.size();
}
std::string Base64::btoa(const string &in)
{
string out;
out.resize(in.size() * 4 / 3 + 4);
out.resize(Base64::btoa((const byte*) in.data(), (int)in.size(), (char *) out.data()));
return out;
}
int Base64::btoa(const byte* b, int blen, char* a)
{
int p = 0;
for (;;)
{
if (blen <= 0)
{
break;
}
a[p++] = to64(*b >> 2);
a[p++] = to64((*b << 4) | (((blen > 1) ? b[1] : 0) >> 4));
if (blen < 2)
{
break;
}
a[p++] = to64(b[1] << 2 | (((blen > 2) ? b[2] : 0) >> 6));
if (blen < 3)
{
break;
}
a[p++] = to64(b[2]);
blen -= 3;
b += 3;
}
a[p] = 0;
return p;
}
byte Base32::to32(byte c)
{
c &= 31;
if (c < 26)
{
return c + 'a';
}
return c - 26 + '2';
}
byte Base32::from32(byte c)
{
if ((c >= 'a') && (c <= 'z'))
{
return c - 'a';
}
if ((c >= '2') && (c <= '9'))
{
return c - '2' + 26;
}
return 255;
}
int Base32::btoa(const byte *b, int blen, char *a)
{
int p = 0;
for (;;)
{
if (blen <= 0)
{
break;
}
a[p++] = to32( *b >> 3);
a[p++] = to32((*b << 2) | (((blen > 1) ? b[1] : 0) >> 6));
if (blen < 2)
{
break;
}
a[p++] = to32(b[1] >> 1);
a[p++] = to32(b[1] << 4 | (((blen > 2) ? b[2] : 0) >> 4));
if (blen < 3)
{
break;
}
a[p++] = to32((b[2] << 1) | (((blen > 3) ? b[3] : 0) >> 7));
if (blen < 4)
{
break;
}
a[p++] = to32(b[3] >> 2);
a[p++] = to32(b[3] << 3 | (((blen > 4) ? b[4] : 0) >> 5));
if (blen < 5)
{
break;
}
a[p++] = to32(b[4]);
blen -= 5;
b += 5;
}
a[p] = 0;
return p;
}
int Base32::atob(const char *a, byte *b, int blen)
{
byte c[8];
int i;
int p = 0;
c[7] = 0;
for (;;)
{
for (i = 0; i < 8; i++)
{
if ((c[i] = from32(*a++)) == 255)
{
break;
}
}
if ((p >= blen) || !i)
{
return p;
}
b[p++] = (c[0] << 3) | ((c[1] & 0x1C) >> 2);
if ((p >= blen) || (i < 4))
{
return p;
}
b[p++] = (c[1] << 6) | (c[2] << 1) | ((c[3] & 0x10) >> 4);
if ((p >= blen) || (i < 5))
{
return p;
}
b[p++] = (c[3] << 4) | ((c[4] & 0x1E) >> 1);
if ((p >= blen) || (i < 7))
{
return p;
}
b[p++] = (c[4] << 7) | (c[5] << 2) | ((c[6] & 0x18) >> 3);
if ((p >= blen) || (i < 8))
{
return p;
}
b[p++] = (c[6] << 5) | c[7];
}
}
bool URLCodec::issafe(char c)
{
if (ishexdigit(c)
|| (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')
|| c == '-' || c == '.'
|| c == '_' || c == '~')
{
return true;
}
return false;
}
unsigned char URLCodec::hexval(char c)
{
return c > '9' ? (c >= 'a' ? c - 'a' + 10 : c - 'A' + 10) : c - '0';
}
bool URLCodec::ishexdigit(char c)
{
return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
}
void URLCodec::escape(string *plain, string *escaped)
{
if (!escaped || !plain)
{
return;
}
escaped->clear();
int len = (int)plain->size();
int escapedIndex = 0;
for (int i = 0; i < len; i++)
{
unsigned char c = (unsigned char)plain->at(i);
if (issafe(c))
{
escaped->push_back(c);
escapedIndex++;
}
else
{
escaped->resize(escapedIndex + 3);
sprintf((char *)escaped->c_str() + escapedIndex, "%%%02x", c);
escapedIndex += 3;
}
}
}
void URLCodec::unescape(string *escaped, string *plain)
{
if (!escaped || !plain)
{
return;
}
plain->clear();
plain->reserve(escaped->size());
int len = (int)escaped->size();
for (int i = 0; i < len; i++)
{
if (escaped->at(i) == '%' && ishexdigit(escaped->at(i + 1)) && ishexdigit(escaped->at(i + 2)))
{
unsigned char c1 = hexval(escaped->at(i + 1));
unsigned char c2 = hexval(escaped->at(i + 2));
unsigned char c = 0xFF & ((c1 << 4) | c2);
plain->push_back(c);
i += 2;
}
else
{
plain->push_back(escaped->at(i));
}
}
}
} // namespace