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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains the declaration of functions for dealing with base64
// encoding and decoding
#include "utils/cross/base64.h"
#include "core/cross/types.h"
namespace o3d {
namespace base64 {
size_t GetEncodeLength(size_t length) {
return (length + 2) / 3 * 4;
}
void Encode(const void* src_ptr, size_t length, void* dst_ptr) {
const int kEncodePad = 64;
static const char kEncode[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/=";
const uint8* src = reinterpret_cast<const uint8*>(src_ptr);
uint8* dst = reinterpret_cast<uint8*>(dst_ptr);
if (dst) {
size_t remainder = length % 3;
const uint8* end = &src[length - remainder];
while (src < end) {
unsigned a = *src++;
unsigned b = *src++;
unsigned c = *src++;
unsigned d = c & 0x3F;
c = (c >> 6 | b << 2) & 0x3F;
b = (b >> 4 | a << 4) & 0x3F;
a = a >> 2;
*dst++ = kEncode[a];
*dst++ = kEncode[b];
*dst++ = kEncode[c];
*dst++ = kEncode[d];
}
if (remainder > 0) {
unsigned k1 = 0;
unsigned k2 = kEncodePad;
unsigned a = *src++;
if (remainder == 2) {
int b = *src++;
k1 = b >> 4;
k2 = (b << 2) & 0x3F;
}
*dst++ = kEncode[a >> 2];
*dst++ = kEncode[(k1 | a << 4) & 0x3F];
*dst++ = kEncode[k2];
*dst++ = kEncode[kEncodePad];
}
}
}
} // namespace base64
} // namespace o3d
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