Current File : //usr/share/passenger/include/cxx_supportlib/vendor-modified/modp_b64_strict_aliasing.cpp
/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2014-2017 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "modp_b64_data.h"
#ifndef MODP_B64_DONT_INCLUDE_BOOST_ENDIANNESS_HEADERS
#include <boost/predef/other/endian.h>
#endif
/* public header */
#include "modp_b64.h"
#if !defined(__x86_64__) && !defined(__x86__)
size_t modp_b64_decode(char* dest, const char* src, size_t len)
{
size_t i;
if (len == 0) return 0;
#ifdef B64_DOPAD
/* if padding is used, then the message must be at least
4 chars and be a multiple of 4.
there can be at most 2 pad chars at the end */
if (len < 4 || (len % 4 != 0)) return -1;
if (src[len-1] == B64_CHARPAD) {
len--;
if (src[len -1] == B64_CHARPAD) {
len--;
}
}
#endif /* B64_DOPAD */
size_t leftover = len % 4;
size_t chunks = (leftover == 0) ? len / 4 - 1 : len /4;
modp_uint8_t* p = (modp_uint8_t*) dest;
modp_uint32_t x = 0;
const modp_uint8_t* srcInt = (modp_uint8_t*) src;
modp_uint8_t y[4];
y[3]=srcInt[0];
y[2]=srcInt[1];
y[1]=srcInt[2];
y[0]=srcInt[3];
srcInt+=4;
for (i = 0; i < chunks; ++i) {
x = d0[y[3]] | d1[y[2]] | d2[y[1]] | d3[y[0]];
if (x >= B64_BADCHAR) return -1;
modp_uint32_t tmp_x = (x << 8);
p[0] = (tmp_x >> 3*8) & 0xFF;
p[1] = (tmp_x >> 2*8) & 0xFF;
p[2] = (tmp_x >> 1*8) & 0xFF;
p[3] = (tmp_x >> 0*8) & 0xFF;
p += 3;
y[3]=srcInt[0];
y[2]=srcInt[1];
y[1]=srcInt[2];
y[0]=srcInt[3];
srcInt+=4;
}
switch (leftover) {
case 0:
x = d0[y[3]] | d1[y[2]] | d2[y[1]] | d3[y[0]];
if (x >= B64_BADCHAR) return -1;
#ifdef BOOST_ENDIAN_BIG_BYTE
*p++ = ((modp_uint8_t*)&x)[1];
*p++ = ((modp_uint8_t*)&x)[2];
*p = ((modp_uint8_t*)&x)[3];
#else
*p++ = ((modp_uint8_t*)&x)[2];
*p++ = ((modp_uint8_t*)&x)[1];
*p = ((modp_uint8_t*)&x)[0];
#endif
return (chunks+1)*3;
#ifndef B64_DOPAD
case 1: /* with padding this is an impossible case */
x = d3[y[3]];
*p = (modp_uint8_t)x;
break;
#endif
case 2:
x = d3[y[3]] *64 + d3[y[2]];
*p = (modp_uint8_t)(x >> 4);
break;
default: /* case 3 */
x = (d3[y[3]] *64 + d3[y[2]])*64 + d3[y[1]];
*p++ = (modp_uint8_t) (x >> 10);
*p = (modp_uint8_t) (x >> 2);
break;
}
if (x >= B64_BADCHAR) return -1;
return 3*chunks + (6*leftover)/8;
}
#endif
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