mirror of https://github.com/aria2/aria2
205 lines
6.0 KiB
C++
205 lines
6.0 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "Base64.h"
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namespace aria2 {
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static const char CHAR_TABLE[] = {
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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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static const int INDEX_TABLE[] = {
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
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-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
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};
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void Base64::encode(unsigned char*& result, size_t& rlength,
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const unsigned char* src, size_t slength)
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{
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if(slength == 0) {
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rlength = 0;
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return;
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}
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size_t trituple = (slength+2)/3;
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int r = slength%3;
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rlength = trituple*4;
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result = new unsigned char[rlength];
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unsigned char* p = result;
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const unsigned char* s = src;
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const unsigned char* smax = s+slength-r;
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while(s != smax) {
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int n = *s++ << 16;
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n += *s++ << 8;
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n += *s++;
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*p++ = CHAR_TABLE[n >> 18];
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*p++ = CHAR_TABLE[n >> 12&0x3f];
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*p++ = CHAR_TABLE[n >> 6&0x3f];
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*p++ = CHAR_TABLE[n&0x3f];
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}
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if(r == 2) {
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int n = *s++ << 16;
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n += *s++ << 8;
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*p++ = CHAR_TABLE[n >> 18];
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*p++ = CHAR_TABLE[n >> 12&0x3f];
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*p++ = CHAR_TABLE[n >> 6&0x3f];
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*p++ = '=';
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} else if(r == 1) {
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int n = *s++ << 16;
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*p++ = CHAR_TABLE[n >> 18];
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*p++ = CHAR_TABLE[n >> 12&0x3f];
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*p++ = '=';
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*p++ = '=';
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}
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}
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void Base64::removeNonBase64Chars(unsigned char*& nsrc,
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size_t& nlength,
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const unsigned char* src,
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size_t slength)
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{
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unsigned char* temp = new unsigned char[slength];
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const unsigned char* end = src+slength;
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size_t n = 0;
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for(const unsigned char*s = src; s != end; ++s) {
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if(INDEX_TABLE[*s] != -1 || *s == '=') {
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*(temp+n++) = *s;
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}
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}
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nlength = n;
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nsrc = temp;
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}
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void Base64::decode(unsigned char*& result, size_t& rlength,
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const unsigned char* src, size_t slength)
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{
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if(slength == 0) {
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rlength = 0;
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return;
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}
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unsigned char* nsrc;
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size_t nlength;
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removeNonBase64Chars(nsrc, nlength, src, slength);
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if(nlength%4 != 0) {
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delete [] nsrc;
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rlength = 0;
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return;
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}
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size_t quadtuple = nlength/4;
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size_t len;
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if(nsrc[nlength-1] == '=') {
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if(nsrc[nlength-2] == '=') {
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len = nlength-2;
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} else {
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len = nlength-1;
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}
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} else {
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len = nlength;
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}
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rlength = len-quadtuple;
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result = new unsigned char[rlength];
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int r = len%4;
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unsigned char* p = result;
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const unsigned char* s = nsrc;
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const unsigned char* smax = s+len-r;
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while(s != smax) {
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int n = INDEX_TABLE[*s++] << 18;
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n += INDEX_TABLE[*s++] << 12;
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n += INDEX_TABLE[*s++] << 6;
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n += INDEX_TABLE[*s++];
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*p++ = n >> 16;
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*p++ = n >> 8&0xff;
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*p++ = n&0xff;
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}
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if(r == 2) {
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int n = INDEX_TABLE[*s++] << 18;
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n += INDEX_TABLE[*s++] << 12;
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*p++ = n >> 16;
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} else if(r == 3) {
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int n = INDEX_TABLE[*s++] << 18;
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n += INDEX_TABLE[*s++] << 12;
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n += INDEX_TABLE[*s++] << 6;
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*p++ = n >> 16;
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*p++ = n >> 8&0xff;
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}
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delete [] nsrc;
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}
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std::string Base64::encode(const std::string& s)
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{
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unsigned char* buf = 0;
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size_t len;
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encode(buf, len, s.c_str(), s.size());
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std::string r(&buf[0], &buf[len]);
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delete [] buf;
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return r;
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}
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std::string Base64::decode(const std::string& s)
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{
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unsigned char* buf = 0;
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size_t len;
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decode(buf, len, s.c_str(), s.size());
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std::string r(&buf[0], &buf[len]);
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delete [] buf;
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return r;
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}
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} // namespace aria2
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