1: /*************************************************************************
2: * (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
6: * $Id: zc.c,v 1.2 2011/05/09 14:36:33 misho Exp $
7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
46: #include "global.h"
47: #include "file.h"
48: #include "zc.h"
49:
50:
51: int sync_Deflate(int inf, int outf, int level)
52: {
53: z_stream z;
54: int ret, flush, readed;
55: u_char ibuf[Z_CHUNK], obuf[Z_CHUNK];
56:
57: lseek(outf, 0l, SEEK_SET);
58: if (lseek(inf, 0l, SEEK_SET) == -1) {
59: SETERR;
60: return -1;
61: }
62:
63: // init zlib
64: memset(&z, 0, sizeof z);
65: ret = deflateInit(&z, level);
66: if (ret)
67: return ret;
68:
69: do {
70: // set input buffer for compress
71: readed = read(inf, ibuf, Z_CHUNK);
72: if (-1 == readed) {
73: SETERR;
74: break;
75: } else {
76: z.avail_in = readed;
77: z.next_in = ibuf;
78: }
79:
80: // check flush flag
81: flush = syncEOF(inf) ? Z_FINISH : Z_NO_FLUSH;
82:
83: do {
84: // compress and write to file
85: z.avail_out = readed;
86: z.next_out = obuf;
87: ret = deflate(&z, flush);
88: if (Z_STREAM_ERROR == ret) {
89: syncSetErr(ENOEXEC, "Error:: can`t deflate !!!\n");
90: flush = Z_FINISH;
91: ret = -1;
92: break;
93: }
94:
95: ret = write(outf, obuf, readed - z.avail_out);
96: if (-1 == ret || ret != readed - z.avail_out) {
97: SETERR;
98: flush = Z_FINISH;
99: ret = -1;
100: break;
101: }
102: } while (!z.avail_out);
103:
104: if (z.avail_in) {
105: syncSetErr(ENOEXEC, "Error:: can`t get all input for deflate !!!\n");
106: ret = -1;
107: break;
108: }
109: } while (flush != Z_FINISH);
110:
111: // free zlib
112: deflateEnd(&z);
113: return ret;
114: }
115:
116: int sync_Inflate(int inf, int outf)
117: {
118: z_stream z;
119: int ret, flush;
120: u_char ibuf[Z_CHUNK], obuf[Z_CHUNK];
121:
122: lseek(outf, 0l, SEEK_SET);
123: if (lseek(inf, 0l, SEEK_SET) == -1) {
124: SETERR;
125: return -1;
126: }
127:
128: // init zlib
129: memset(&z, 0, sizeof z);
130: ret = inflateInit(&z);
131: if (ret)
132: return ret;
133:
134: do {
135: // set input buffer for decompress
136: ret = read(inf, ibuf, Z_CHUNK);
137: if (-1 == ret) {
138: SETERR;
139: break;
140: }
141: if (!ret)
142: break;
143: z.avail_in = ret;
144: z.next_in = ibuf;
145:
146: flush = Z_NO_FLUSH;
147:
148: do {
149: // decompress and write to file
150: z.avail_out = Z_CHUNK;
151: z.next_out = obuf;
152: ret = inflate(&z, flush);
153: switch (ret) {
154: case Z_NEED_DICT:
155: case Z_DATA_ERROR:
156: case Z_MEM_ERROR:
157: syncSetErr(ENOEXEC, "Error:: can`t inflate !!!\n");
158: flush = Z_STREAM_END;
159: ret = -1;
160: break;
161: }
162:
163: ret = write(outf, obuf, Z_CHUNK - z.avail_out);
164: if (-1 == ret || ret != Z_CHUNK - z.avail_out) {
165: SETERR;
166: flush = Z_STREAM_END;
167: ret = -1;
168: break;
169: }
170: } while (!z.avail_out);
171: } while (flush != Z_STREAM_END);
172:
173: // free zlib
174: inflateEnd(&z);
175: return ret;
176: }
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