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