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153 lines
4.0 KiB
C
153 lines
4.0 KiB
C
/*
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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.
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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_uuencode.h"
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const mbfl_encoding mbfl_encoding_uuencode = {
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mbfl_no_encoding_uuencode,
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"UUENCODE",
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"x-uuencode",
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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_uuencode_8bit = {
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mbfl_no_encoding_uuencode,
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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_uudec,
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mbfl_filt_conv_common_flush
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};
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#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
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/* uuencode => any */
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#define UUDEC(c) (char)(((c)-' ')&077)
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static const char * uuenc_begin_text = "begin ";
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enum { uudec_state_ground=0, uudec_state_inbegin,
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uudec_state_until_newline,
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uudec_state_size, uudec_state_a, uudec_state_b, uudec_state_c, uudec_state_d,
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uudec_state_skip_newline};
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int mbfl_filt_conv_uudec(int c, mbfl_convert_filter * filter)
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{
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int n;
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switch(filter->status) {
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case uudec_state_ground:
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/* looking for "begin 0666 filename\n" line */
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if (filter->cache == 0 && c == 'b')
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{
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filter->status = uudec_state_inbegin;
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filter->cache = 1; /* move to 'e' */
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}
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else if (c == '\n')
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filter->cache = 0;
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else
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filter->cache++;
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break;
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case uudec_state_inbegin:
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if (uuenc_begin_text[filter->cache++] != c) {
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/* doesn't match pattern */
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filter->status = uudec_state_ground;
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break;
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}
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if (filter->cache == 5)
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{
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/* thats good enough - wait for a newline */
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filter->status = uudec_state_until_newline;
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filter->cache = 0;
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}
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break;
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case uudec_state_until_newline:
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if (c == '\n')
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filter->status = uudec_state_size;
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break;
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case uudec_state_size:
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/* get "size" byte */
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n = UUDEC(c);
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filter->cache = n << 24;
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filter->status = uudec_state_a;
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break;
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case uudec_state_a:
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/* get "a" byte */
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n = UUDEC(c);
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filter->cache |= (n << 16);
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filter->status = uudec_state_b;
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break;
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case uudec_state_b:
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/* get "b" byte */
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n = UUDEC(c);
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filter->cache |= (n << 8);
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filter->status = uudec_state_c;
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break;
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case uudec_state_c:
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/* get "c" byte */
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n = UUDEC(c);
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filter->cache |= n;
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filter->status = uudec_state_d;
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break;
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case uudec_state_d:
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/* get "d" byte */
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{
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int A, B, C, D = UUDEC(c);
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A = (filter->cache >> 16) & 0xff;
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B = (filter->cache >> 8) & 0xff;
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C = (filter->cache) & 0xff;
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n = (filter->cache >> 24) & 0xff;
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if (n-- > 0)
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CK((*filter->output_function)( (A << 2) | (B >> 4), filter->data));
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if (n-- > 0)
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CK((*filter->output_function)( (B << 4) | (C >> 2), filter->data));
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if (n-- > 0)
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CK((*filter->output_function)( (C << 6) | D, filter->data));
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filter->cache = n << 24;
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if (n == 0)
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filter->status = uudec_state_skip_newline; /* skip next byte (newline) */
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else
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filter->status = uudec_state_a; /* go back to fetch "A" byte */
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}
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break;
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case uudec_state_skip_newline:
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/* skip newline */
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filter->status = uudec_state_size;
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}
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return c;
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}
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