75dfa6a6fb
Add packJPG filter for Jpeg files (not active yet). Directory format changes for clarity.
130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/*
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* This file is a part of Pcompress, a chunked parallel multi-
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* algorithm lossless compression and decompression program.
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*
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* Copyright (C) 2012-2013 Moinak Ghosh. All rights reserved.
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* Use is subject to license terms.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (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 GNU
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* 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 this program.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* moinakg@belenix.org, http://moinakg.wordpress.com/
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*
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*/
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/*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <limits.h>
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#include <utils.h>
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#include <sys/mman.h>
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#include <ctype.h>
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#include <archive.h>
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#include <archive_entry.h>
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#include "pc_arc_filter.h"
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#include "pc_archive.h"
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#define PACKJPG_DEF_BUFSIZ (512 * 1024)
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#define JPG_SIZE_LIMIT (100 * 1024 * 1024)
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struct packjpg_filter_data {
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uchar_t *buff;
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size_t bufflen;
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};
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extern size_t packjpg_filter_process(uchar_t *in_buf, size_t len, uchar_t **out_buf);
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int packjpg_filter(struct filter_info *fi, void *filter_private);
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void
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add_filters_by_ext()
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{
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struct packjpg_filter_data *pjdat;
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pjdat = (struct packjpg_filter_data *)malloc(sizeof (struct packjpg_filter_data));
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pjdat->buff = (uchar_t *)malloc(PACKJPG_DEF_BUFSIZ);
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pjdat->bufflen = PACKJPG_DEF_BUFSIZ;
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if (insert_filter_data(packjpg_filter, pjdat, "pjg") != 0) {
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free(pjdat->buff);
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free(pjdat);
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log_msg(LOG_WARN, 0, "Failed to add filter module for packJPG.");
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}
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}
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/* a short reminder about input/output stream types
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for the pjglib_init_streams() function
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if input is file
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----------------
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in_scr -> name of input file
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in_type -> 0
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in_size -> ignore
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if input is memory
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------------------
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in_scr -> array containg data
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in_type -> 1
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in_size -> size of data array
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if input is *FILE (f.e. stdin)
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------------------------------
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in_src -> stream pointer
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in_type -> 2
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in_size -> ignore
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vice versa for output streams! */
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int
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packjpg_filter(struct filter_info *fi, void *filter_private)
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{
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struct packjpg_filter_data *pjdat = (struct packjpg_filter_data *)filter_private;
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uchar_t *mapbuf, *out;
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size_t len;
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len = archive_entry_size(fi->entry);
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if (len > JPG_SIZE_LIMIT) // Bork on massive JPEGs
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return (-1);
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mapbuf = mmap(NULL, len, PROT_READ, MAP_SHARED, fi->fd, 0);
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if (mapbuf == NULL)
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return (-1);
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if (pjdat->bufflen < len) {
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free(pjdat->buff);
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pjdat->bufflen = len;
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pjdat->buff = malloc(pjdat->bufflen);
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if (pjdat->buff == NULL) {
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log_msg(LOG_ERR, 1, "Out of memory.");
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munmap(mapbuf, len);
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return (-1);
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}
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}
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/*
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* Helper routine to bridge to packJPG C++ lib, without changing packJPG itself.
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*/
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out = pjdat->buff;
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if ((len = packjpg_filter_process(mapbuf, len, &out)) == 0) {
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return (-1);
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}
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return (archive_write_data(fi->target_arc, out, len));
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}
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