2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2006 Alexander Barton (alex@barton.de)
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 * Please read the file COPYING, README and AUTHORS for more information.
11 * Connection compression using ZLIB
22 /* enable more zlib related debug messages: */
23 /* #define DEBUG_ZLIB */
25 static char UNUSED id[] = "$Id: conn-zip.c,v 1.15 2007/05/17 15:16:47 alex Exp $";
33 #include "conn-func.h"
42 Zip_InitConn( CONN_ID Idx )
44 /* Kompression fuer Link initialisieren */
48 My_Connections[Idx].zip.in.avail_in = 0;
49 My_Connections[Idx].zip.in.total_in = 0;
50 My_Connections[Idx].zip.in.total_out = 0;
51 My_Connections[Idx].zip.in.zalloc = NULL;
52 My_Connections[Idx].zip.in.zfree = NULL;
53 My_Connections[Idx].zip.in.data_type = Z_ASCII;
55 if( inflateInit( &My_Connections[Idx].zip.in ) != Z_OK )
58 Log( LOG_ALERT, "Can't initialize compression on connection %d (zlib inflate)!", Idx );
62 My_Connections[Idx].zip.out.total_in = 0;
63 My_Connections[Idx].zip.out.total_in = 0;
64 My_Connections[Idx].zip.out.zalloc = NULL;
65 My_Connections[Idx].zip.out.zfree = NULL;
66 My_Connections[Idx].zip.out.data_type = Z_ASCII;
68 if( deflateInit( &My_Connections[Idx].zip.out, Z_DEFAULT_COMPRESSION ) != Z_OK )
71 Log( LOG_ALERT, "Can't initialize compression on connection %d (zlib deflate)!", Idx );
75 My_Connections[Idx].zip.bytes_in = My_Connections[Idx].bytes_in;
76 My_Connections[Idx].zip.bytes_out = My_Connections[Idx].bytes_out;
78 Log( LOG_INFO, "Enabled link compression (zlib) on connection %d.", Idx );
79 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ZIP );
86 Zip_Buffer( CONN_ID Idx, char *Data, size_t Len )
91 assert( Data != NULL );
94 buflen = array_bytes(&My_Connections[Idx].zip.wbuf);
95 if (buflen >= WRITEBUFFER_LEN) {
96 /* compression buffer is full, flush */
97 if( ! Zip_Flush( Idx )) return false;
100 /* check again; if zip buf is still too large do not append data:
101 * otherwise the zip wbuf would grow too large */
102 buflen = array_bytes(&My_Connections[Idx].zip.wbuf);
103 if (buflen >= WRITEBUFFER_LEN)
105 return array_catb(&My_Connections[Idx].zip.wbuf, Data, Len);
110 * Compress data in ZIP buffer and move result to the write buffer of
112 * @param Idx Connection handle.
113 * @retrun true on success, false otherwise.
116 Zip_Flush( CONN_ID Idx )
119 unsigned char zipbuf[WRITEBUFFER_LEN];
123 out = &My_Connections[Idx].zip.out;
125 out->avail_in = (uInt)array_bytes(&My_Connections[Idx].zip.wbuf);
127 return true; /* nothing to do. */
129 out->next_in = array_start(&My_Connections[Idx].zip.wbuf);
130 assert(out->next_in != NULL);
132 out->next_out = zipbuf;
133 out->avail_out = (uInt)sizeof zipbuf;
136 Log(LOG_DEBUG, "out->avail_in %d, out->avail_out %d",
137 out->avail_in, out->avail_out);
139 result = deflate( out, Z_SYNC_FLUSH );
140 if(( result != Z_OK ) || ( out->avail_in > 0 ))
142 Log( LOG_ALERT, "Compression error: code %d!?", result );
143 Conn_Close( Idx, "Compression error!", NULL, false );
147 if (out->avail_out <= 0) {
148 /* Not all data was compressed, because data became
149 * bigger while compressing it. */
150 Log (LOG_ALERT, "Compression error: buffer overvlow!?");
151 Conn_Close(Idx, "Compression error!", NULL, false);
155 assert(out->avail_out <= WRITEBUFFER_LEN);
157 zipbuf_used = WRITEBUFFER_LEN - out->avail_out;
159 Log(LOG_DEBUG, "zipbuf_used: %d", zipbuf_used);
161 if (!array_catb(&My_Connections[Idx].wbuf,
162 (char *)zipbuf, (size_t) zipbuf_used)) {
163 Log (LOG_ALERT, "Compression error: can't copy data!?");
164 Conn_Close(Idx, "Compression error!", NULL, false);
168 My_Connections[Idx].bytes_out += zipbuf_used;
169 My_Connections[Idx].zip.bytes_out += array_bytes(&My_Connections[Idx].zip.wbuf);
170 array_trunc(&My_Connections[Idx].zip.wbuf);
177 Unzip_Buffer( CONN_ID Idx )
179 /* Daten entpacken und in Lesepuffer kopieren. Bei Fehlern
180 * wird false geliefert, ansonsten true. Der Fall, dass keine
181 * Daten mehr zu entpacken sind, ist _kein_ Fehler! */
184 unsigned char unzipbuf[READBUFFER_LEN];
185 int unzipbuf_used = 0;
186 unsigned int z_rdatalen;
191 assert( Idx > NONE );
193 z_rdatalen = (unsigned int)array_bytes(&My_Connections[Idx].zip.rbuf);
197 in = &My_Connections[Idx].zip.in;
199 in->next_in = array_start(&My_Connections[Idx].zip.rbuf);
200 assert(in->next_in != NULL);
202 in->avail_in = z_rdatalen;
203 in->next_out = unzipbuf;
204 in->avail_out = (uInt)sizeof unzipbuf;
207 Log(LOG_DEBUG, "in->avail_in %d, in->avail_out %d",
208 in->avail_in, in->avail_out);
210 result = inflate( in, Z_SYNC_FLUSH );
213 Log( LOG_ALERT, "Decompression error: %s (code=%d, ni=%d, ai=%d, no=%d, ao=%d)!?", in->msg, result, in->next_in, in->avail_in, in->next_out, in->avail_out );
214 Conn_Close( Idx, "Decompression error!", NULL, false );
218 assert(z_rdatalen >= in->avail_in);
219 in_len = z_rdatalen - in->avail_in;
220 unzipbuf_used = READBUFFER_LEN - in->avail_out;
222 Log(LOG_DEBUG, "unzipbuf_used: %d - %d = %d", READBUFFER_LEN,
223 in->avail_out, unzipbuf_used);
225 assert(unzipbuf_used <= READBUFFER_LEN);
226 if (!array_catb(&My_Connections[Idx].rbuf, (char*) unzipbuf,
227 (size_t)unzipbuf_used))
230 if( in->avail_in > 0 ) {
231 array_moveleft(&My_Connections[Idx].zip.rbuf, 1, in_len );
233 array_trunc( &My_Connections[Idx].zip.rbuf );
234 My_Connections[Idx].zip.bytes_in += unzipbuf_used;
242 Zip_SendBytes( CONN_ID Idx )
244 /* Anzahl gesendeter Bytes (komprimiert!) liefern */
246 assert( Idx > NONE );
247 return My_Connections[Idx].zip.bytes_out;
248 } /* Zip_SendBytes */
252 Zip_RecvBytes( CONN_ID Idx )
254 /* Anzahl gesendeter Bytes (komprimiert!) liefern */
256 assert( Idx > NONE );
257 return My_Connections[Idx].zip.bytes_in;
258 } /* Zip_RecvBytes */