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/*
* "streamable kanji code filter and converter"
* Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
*
* LICENSE NOTICES
*
* This file is part of "streamable kanji code filter and converter",
* which is distributed under the terms of GNU Lesser General Public
* License (version 2) as published by the Free Software Foundation.
*
* This software 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. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with "streamable kanji code filter and converter";
* if not, write to the Free Software Foundation, Inc., 59 Temple Place,
* Suite 330, Boston, MA 02111-1307 USA
*
* The author of this file:
*
*/
/*
* The source code included in this files was separated from mbfilter.c
* by Moriyoshi Koizumi <moriyoshi@php.net> on 4 Dec 2002. The file
* mbfilter.c is included in this package .
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mbfilter.h"
#include "mbfilter_base64.h"
const mbfl_encoding mbfl_encoding_base64 = {
mbfl_no_encoding_base64,
"BASE64",
"BASE64",
NULL,
NULL,
MBFL_ENCTYPE_SBCS
};
const struct mbfl_convert_vtbl vtbl_8bit_b64 = {
mbfl_no_encoding_8bit,
mbfl_no_encoding_base64,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_base64enc,
mbfl_filt_conv_base64enc_flush
};
const struct mbfl_convert_vtbl vtbl_b64_8bit = {
mbfl_no_encoding_base64,
mbfl_no_encoding_8bit,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_base64dec,
mbfl_filt_conv_base64dec_flush
};
#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
/*
* any => BASE64
*/
static const unsigned char mbfl_base64_table[] = {
/* 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', */
0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
/* 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,
/* 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', */
0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
/* 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
/* '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0' */
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2f,0x00
};
int mbfl_filt_conv_base64enc(int c, mbfl_convert_filter *filter)
{
int n;
n = (filter->status & 0xff);
if (n == 0) {
filter->status++;
filter->cache = (c & 0xff) << 16;
} else if (n == 1) {
filter->status++;
filter->cache |= (c & 0xff) << 8;
} else {
filter->status &= ~0xff;
if ((filter->status & MBFL_BASE64_STS_MIME_HEADER) == 0) {
n = (filter->status & 0xff00) >> 8;
if (n > 72) {
CK((*filter->output_function)(0x0d, filter->data)); /* CR */
CK((*filter->output_function)(0x0a, filter->data)); /* LF */
filter->status &= ~0xff00;
}
filter->status += 0x400;
}
n = filter->cache | (c & 0xff);
CK((*filter->output_function)(mbfl_base64_table[(n >> 18) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(n >> 12) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(n >> 6) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[n & 0x3f], filter->data));
}
return c;
}
int mbfl_filt_conv_base64enc_flush(mbfl_convert_filter *filter)
{
int status, cache, len;
status = filter->status & 0xff;
cache = filter->cache;
len = (filter->status & 0xff00) >> 8;
filter->status &= ~0xffff;
filter->cache = 0;
/* flush fragments */
if (status >= 1) {
if ((filter->status & MBFL_BASE64_STS_MIME_HEADER) == 0) {
if (len > 72){
CK((*filter->output_function)(0x0d, filter->data)); /* CR */
CK((*filter->output_function)(0x0a, filter->data)); /* LF */
}
}
CK((*filter->output_function)(mbfl_base64_table[(cache >> 18) & 0x3f], filter->data));
CK((*filter->output_function)(mbfl_base64_table[(cache >> 12) & 0x3f], filter->data));
if (status == 1) {
CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
} else {
CK((*filter->output_function)(mbfl_base64_table[(cache >> 6) & 0x3f], filter->data));
CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
}
}
return 0;
}
/*
* BASE64 => any
*/
int mbfl_filt_conv_base64dec(int c, mbfl_convert_filter *filter)
{
int n;
if (c == 0x0d || c == 0x0a || c == 0x20 || c == 0x09 || c == 0x3d) { /* CR or LF or SPACE or HTAB or '=' */
return c;
}
n = 0;
if (c >= 0x41 && c <= 0x5a) { /* A - Z */
n = c - 65;
} else if (c >= 0x61 && c <= 0x7a) { /* a - z */
n = c - 71;
} else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
n = c + 4;
} else if (c == 0x2b) { /* '+' */
n = 62;
} else if (c == 0x2f) { /* '/' */
n = 63;
}
n &= 0x3f;
switch (filter->status) {
case 0:
filter->status = 1;
filter->cache = n << 18;
break;
case 1:
filter->status = 2;
filter->cache |= n << 12;
break;
case 2:
filter->status = 3;
filter->cache |= n << 6;
break;
default:
filter->status = 0;
n |= filter->cache;
CK((*filter->output_function)((n >> 16) & 0xff, filter->data));
CK((*filter->output_function)((n >> 8) & 0xff, filter->data));
CK((*filter->output_function)(n & 0xff, filter->data));
break;
}
return c;
}
int mbfl_filt_conv_base64dec_flush(mbfl_convert_filter *filter)
{
int status, cache;
status = filter->status;
cache = filter->cache;
filter->status = 0;
filter->cache = 0;
/* flush fragments */
if (status >= 2) {
CK((*filter->output_function)((cache >> 16) & 0xff, filter->data));
if (status >= 3) {
CK((*filter->output_function)((cache >> 8) & 0xff, filter->data));
}
}
return 0;
}
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