2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2007 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 1.16 2007/05/17 23:34:24 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 * Copy data to the compression buffer of a connection. We do collect
87 * some data there until it's full so that we can achieve better
89 * If the (pre-)compression buffer is full, we try to flush it ("actually
90 * compress some data") and to add the new (uncompressed) data afterwards.
91 * @param Idx Connection handle.
92 * @param Data Pointer to the data.
93 * @param Len Length of the data to add.
94 * @return true on success, false otherwise. */
96 Zip_Buffer( CONN_ID Idx, char *Data, size_t Len )
100 assert( Idx > NONE );
101 assert( Data != NULL );
104 buflen = array_bytes(&My_Connections[Idx].zip.wbuf);
105 if (buflen + Len >= WRITEBUFFER_SLINK_LEN) {
106 /* compression buffer is full, flush */
107 if( ! Zip_Flush( Idx )) return false;
110 /* check again; if zip buf is still too large do not append data:
111 * otherwise the zip wbuf would grow too large */
112 buflen = array_bytes(&My_Connections[Idx].zip.wbuf);
113 if (buflen + Len >= WRITEBUFFER_SLINK_LEN)
116 return array_catb(&My_Connections[Idx].zip.wbuf, Data, Len);
121 * Compress data in ZIP buffer and move result to the write buffer of
123 * @param Idx Connection handle.
124 * @retrun true on success, false otherwise.
127 Zip_Flush( CONN_ID Idx )
130 unsigned char zipbuf[WRITEBUFFER_SLINK_LEN];
134 out = &My_Connections[Idx].zip.out;
136 out->avail_in = (uInt)array_bytes(&My_Connections[Idx].zip.wbuf);
138 return true; /* nothing to do. */
140 out->next_in = array_start(&My_Connections[Idx].zip.wbuf);
141 assert(out->next_in != NULL);
143 out->next_out = zipbuf;
144 out->avail_out = (uInt)sizeof zipbuf;
147 Log(LOG_DEBUG, "out->avail_in %d, out->avail_out %d",
148 out->avail_in, out->avail_out);
150 result = deflate( out, Z_SYNC_FLUSH );
151 if(( result != Z_OK ) || ( out->avail_in > 0 ))
153 Log( LOG_ALERT, "Compression error: code %d!?", result );
154 Conn_Close( Idx, "Compression error!", NULL, false );
158 if (out->avail_out <= 0) {
159 /* Not all data was compressed, because data became
160 * bigger while compressing it. */
161 Log (LOG_ALERT, "Compression error: buffer overvlow!?");
162 Conn_Close(Idx, "Compression error!", NULL, false);
166 assert(out->avail_out <= WRITEBUFFER_SLINK_LEN);
168 zipbuf_used = WRITEBUFFER_SLINK_LEN - out->avail_out;
170 Log(LOG_DEBUG, "zipbuf_used: %d", zipbuf_used);
172 if (!array_catb(&My_Connections[Idx].wbuf,
173 (char *)zipbuf, (size_t) zipbuf_used)) {
174 Log (LOG_ALERT, "Compression error: can't copy data!?");
175 Conn_Close(Idx, "Compression error!", NULL, false);
179 My_Connections[Idx].bytes_out += zipbuf_used;
180 My_Connections[Idx].zip.bytes_out += array_bytes(&My_Connections[Idx].zip.wbuf);
181 array_trunc(&My_Connections[Idx].zip.wbuf);
188 Unzip_Buffer( CONN_ID Idx )
190 /* Daten entpacken und in Lesepuffer kopieren. Bei Fehlern
191 * wird false geliefert, ansonsten true. Der Fall, dass keine
192 * Daten mehr zu entpacken sind, ist _kein_ Fehler! */
195 unsigned char unzipbuf[READBUFFER_LEN];
196 int unzipbuf_used = 0;
197 unsigned int z_rdatalen;
202 assert( Idx > NONE );
204 z_rdatalen = (unsigned int)array_bytes(&My_Connections[Idx].zip.rbuf);
208 in = &My_Connections[Idx].zip.in;
210 in->next_in = array_start(&My_Connections[Idx].zip.rbuf);
211 assert(in->next_in != NULL);
213 in->avail_in = z_rdatalen;
214 in->next_out = unzipbuf;
215 in->avail_out = (uInt)sizeof unzipbuf;
218 Log(LOG_DEBUG, "in->avail_in %d, in->avail_out %d",
219 in->avail_in, in->avail_out);
221 result = inflate( in, Z_SYNC_FLUSH );
224 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 );
225 Conn_Close( Idx, "Decompression error!", NULL, false );
229 assert(z_rdatalen >= in->avail_in);
230 in_len = z_rdatalen - in->avail_in;
231 unzipbuf_used = READBUFFER_LEN - in->avail_out;
233 Log(LOG_DEBUG, "unzipbuf_used: %d - %d = %d", READBUFFER_LEN,
234 in->avail_out, unzipbuf_used);
236 assert(unzipbuf_used <= READBUFFER_LEN);
237 if (!array_catb(&My_Connections[Idx].rbuf, (char*) unzipbuf,
238 (size_t)unzipbuf_used))
241 if( in->avail_in > 0 ) {
242 array_moveleft(&My_Connections[Idx].zip.rbuf, 1, in_len );
244 array_trunc( &My_Connections[Idx].zip.rbuf );
245 My_Connections[Idx].zip.bytes_in += unzipbuf_used;
253 Zip_SendBytes( CONN_ID Idx )
255 /* Anzahl gesendeter Bytes (komprimiert!) liefern */
257 assert( Idx > NONE );
258 return My_Connections[Idx].zip.bytes_out;
259 } /* Zip_SendBytes */
263 Zip_RecvBytes( CONN_ID Idx )
265 /* Anzahl gesendeter Bytes (komprimiert!) liefern */
267 assert( Idx > NONE );
268 return My_Connections[Idx].zip.bytes_in;
269 } /* Zip_RecvBytes */