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234 lines
5.8 KiB
C
234 lines
5.8 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.
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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_qprint.h"
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#include "unicode_prop.h"
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static const char *mbfl_encoding_qprint_aliases[] = {"qprint", NULL};
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const mbfl_encoding mbfl_encoding_qprint = {
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mbfl_no_encoding_qprint,
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"Quoted-Printable",
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"Quoted-Printable",
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(const char *(*)[])&mbfl_encoding_qprint_aliases,
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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_qprint = {
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mbfl_no_encoding_8bit,
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mbfl_no_encoding_qprint,
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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_qprintenc,
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mbfl_filt_conv_qprintenc_flush };
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const struct mbfl_convert_vtbl vtbl_qprint_8bit = {
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mbfl_no_encoding_qprint,
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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_qprintdec,
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mbfl_filt_conv_qprintdec_flush };
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#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
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/*
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* any => Quoted-Printable
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*/
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int mbfl_filt_conv_qprintenc(int c, mbfl_convert_filter *filter)
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{
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int s, n;
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switch (filter->status & 0xff) {
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case 0:
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filter->cache = c;
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filter->status++;
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break;
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default:
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s = filter->cache;
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filter->cache = c;
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n = (filter->status & 0xff00) >> 8;
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if (s == 0) { /* null */
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CK((*filter->output_function)(s, filter->data));
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filter->status &= ~0xff00;
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break;
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}
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if ((filter->status & MBFL_QPRINT_STS_MIME_HEADER) == 0) {
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if (s == 0x0a || (s == 0x0d && c != 0x0a)) { /* line feed */
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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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break;
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} else if (s == 0x0d) {
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break;
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}
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}
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if ((filter->status & MBFL_QPRINT_STS_MIME_HEADER) == 0 && n >= 72) { /* soft line feed */
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CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
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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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if (s <= 0 || s >= 0x80 || s == 0x3d /* not ASCII or '=' */
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|| ((filter->status & MBFL_QPRINT_STS_MIME_HEADER) != 0 &&
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(mbfl_charprop_table[s] & MBFL_CHP_MMHQENC) != 0)) {
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/* hex-octet */
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CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
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n = (s >> 4) & 0xf;
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if (n < 10) {
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n += 48; /* '0' */
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} else {
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n += 55; /* 'A' - 10 */
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}
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CK((*filter->output_function)(n, filter->data));
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n = s & 0xf;
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if (n < 10) {
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n += 48;
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} else {
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n += 55;
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}
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CK((*filter->output_function)(n, filter->data));
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if ((filter->status & MBFL_QPRINT_STS_MIME_HEADER) == 0) {
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filter->status += 0x300;
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}
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} else {
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CK((*filter->output_function)(s, filter->data));
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if ((filter->status & MBFL_QPRINT_STS_MIME_HEADER) == 0) {
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filter->status += 0x100;
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}
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}
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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_qprintenc_flush(mbfl_convert_filter *filter)
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{
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/* flush filter cache */
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(*filter->filter_function)('\0', filter);
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filter->status &= ~0xffff;
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filter->cache = 0;
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return 0;
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}
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/*
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* Quoted-Printable => any
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*/
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int mbfl_filt_conv_qprintdec(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 1:
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if ((c >= 0x30 && c <= 0x39) || (c >= 0x41 && c <= 0x46)) { /* 0 - 9 or A - F */
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filter->cache = c;
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filter->status = 2;
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} else if (c == 0x0d) { /* soft line feed */
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filter->status = 3;
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} else if (c == 0x0a) { /* soft line feed */
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filter->status = 0;
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} else {
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CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
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CK((*filter->output_function)(c, filter->data));
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filter->status = 0;
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}
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break;
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case 2:
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n = filter->cache;
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if (n >= 0x30 && n <= 0x39) { /* '0' - '9' */
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n -= 48; /* 48 = '0' */
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} else {
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n -= 55; /* 55 = 'A' - 10 */
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}
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n <<= 4;
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if (c >= 0x30 && c <= 0x39) { /* '0' - '9' */
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n += (c - 48);
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} else if (c >= 0x41 && c <= 0x46) { /* 'A' - 'F' */
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n += (c - 55);
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} else {
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CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
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CK((*filter->output_function)(filter->cache, filter->data));
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n = c;
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}
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CK((*filter->output_function)(n, filter->data));
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filter->status = 0;
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break;
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case 3:
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if (c != 0x0a) { /* LF */
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CK((*filter->output_function)(c, filter->data));
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}
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filter->status = 0;
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break;
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default:
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if (c == 0x3d) { /* '=' */
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filter->status = 1;
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} else {
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CK((*filter->output_function)(c, filter->data));
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}
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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_qprintdec_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 == 1) {
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CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
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} else if (status == 2) {
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CK((*filter->output_function)(0x3d, filter->data)); /* '=' */
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CK((*filter->output_function)(cache, filter->data));
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}
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return 0;
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}
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