+/*
+ * ngIRCd -- The Next Generation IRC Daemon
+ * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * Please read the file COPYING, README and AUTHORS for more information.
+ *
+ * Connection compression using ZLIB
+ */
+
+
+#include "portab.h"
+
+#define __conn_zip_c__
+
+
+#ifdef USE_ZLIB
+
+static char UNUSED id[] = "$Id: conn-zip.c,v 1.1 2002/12/30 16:07:23 alex Exp $";
+
+#include "imp.h"
+#include <assert.h>
+#include <string.h>
+#include <zlib.h>
+
+#include "conn.h"
+#include "log.h"
+
+#include "exp.h"
+#include "conn-zip.h"
+
+
+GLOBAL BOOLEAN
+Zip_InitConn( CONN_ID Idx )
+{
+ /* Kompression fuer Link initialisieren */
+
+ assert( Idx > NONE );
+
+ My_Connections[Idx].zip.in.avail_in = 0;
+ My_Connections[Idx].zip.in.total_in = 0;
+ My_Connections[Idx].zip.in.total_out = 0;
+ My_Connections[Idx].zip.in.zalloc = NULL;
+ My_Connections[Idx].zip.in.zfree = NULL;
+ My_Connections[Idx].zip.in.data_type = Z_ASCII;
+
+ if( inflateInit( &My_Connections[Idx].zip.in ) != Z_OK )
+ {
+ /* Fehler! */
+ Log( LOG_ALERT, "Can't initialize compression on connection %d (zlib inflate)!", Idx );
+ return FALSE;
+ }
+
+ My_Connections[Idx].zip.out.total_in = 0;
+ My_Connections[Idx].zip.out.total_in = 0;
+ My_Connections[Idx].zip.out.zalloc = NULL;
+ My_Connections[Idx].zip.out.zfree = NULL;
+ My_Connections[Idx].zip.out.data_type = Z_ASCII;
+
+ if( deflateInit( &My_Connections[Idx].zip.out, Z_DEFAULT_COMPRESSION ) != Z_OK )
+ {
+ /* Fehler! */
+ Log( LOG_ALERT, "Can't initialize compression on connection %d (zlib deflate)!", Idx );
+ return FALSE;
+ }
+
+ My_Connections[Idx].zip.bytes_in = My_Connections[Idx].bytes_in;
+ My_Connections[Idx].zip.bytes_out = My_Connections[Idx].bytes_out;
+
+ Log( LOG_INFO, "Enabled link compression (zlib) on connection %d.", Idx );
+ Conn_SetOption( Idx, CONN_ZIP );
+
+ return TRUE;
+} /* Zip_InitConn */
+
+
+GLOBAL BOOLEAN
+Zip_Buffer( CONN_ID Idx, CHAR *Data, INT Len )
+{
+ /* Daten zum Komprimieren im "Kompressions-Puffer" sammeln.
+ * Es wird TRUE bei Erfolg, sonst FALSE geliefert. */
+
+ assert( Idx > NONE );
+ assert( Data != NULL );
+ assert( Len > 0 );
+
+ /* Ist noch Platz im Kompressions-Puffer? */
+ if( ZWRITEBUFFER_LEN - My_Connections[Idx].zip.wdatalen < Len + 50 )
+ {
+ /* Nein! Puffer zunaechst leeren ...*/
+ if( ! Zip_Flush( Idx )) return FALSE;
+ }
+
+ /* Daten kopieren */
+ memmove( My_Connections[Idx].zip.wbuf + My_Connections[Idx].zip.wdatalen, Data, Len );
+ My_Connections[Idx].zip.wdatalen += Len;
+
+ return TRUE;
+} /* Zip_Buffer */
+
+
+GLOBAL BOOLEAN
+Zip_Flush( CONN_ID Idx )
+{
+ /* Daten komprimieren und in Schreibpuffer kopieren.
+ * Es wird TRUE bei Erfolg, sonst FALSE geliefert. */
+
+ INT result, out_len;
+ z_stream *out;
+
+ out = &My_Connections[Idx].zip.out;
+
+ out->next_in = My_Connections[Idx].zip.wbuf;
+ out->avail_in = My_Connections[Idx].zip.wdatalen;
+ out->next_out = My_Connections[Idx].wbuf + My_Connections[Idx].wdatalen;
+ out->avail_out = WRITEBUFFER_LEN - My_Connections[Idx].wdatalen;
+
+ result = deflate( out, Z_SYNC_FLUSH );
+ if(( result != Z_OK ) || ( out->avail_in > 0 ))
+ {
+ Log( LOG_ALERT, "Compression error: code %d!?", result );
+ Conn_Close( Idx, "Compression error!", NULL, FALSE );
+ return FALSE;
+ }
+
+ out_len = WRITEBUFFER_LEN - My_Connections[Idx].wdatalen - out->avail_out;
+ My_Connections[Idx].wdatalen += out_len;
+ My_Connections[Idx].bytes_out += out_len;
+ My_Connections[Idx].zip.bytes_out += My_Connections[Idx].zip.wdatalen;
+ My_Connections[Idx].zip.wdatalen = 0;
+
+ return TRUE;
+} /* Zip_Flush */
+
+
+GLOBAL BOOLEAN
+Unzip_Buffer( CONN_ID Idx )
+{
+ /* Daten entpacken und in Lesepuffer kopieren. Bei Fehlern
+ * wird FALSE geliefert, ansonsten TRUE. Der Fall, dass keine
+ * Daten mehr zu entpacken sind, ist _kein_ Fehler! */
+
+ INT result, in_len, out_len;
+ z_stream *in;
+
+ assert( Idx > NONE );
+
+ if( My_Connections[Idx].zip.rdatalen <= 0 ) return TRUE;
+
+ in = &My_Connections[Idx].zip.in;
+
+ in->next_in = My_Connections[Idx].zip.rbuf;
+ in->avail_in = My_Connections[Idx].zip.rdatalen;
+ in->next_out = My_Connections[Idx].rbuf + My_Connections[Idx].rdatalen;
+ in->avail_out = READBUFFER_LEN - My_Connections[Idx].rdatalen - 1;
+
+ result = inflate( in, Z_SYNC_FLUSH );
+ if( result != Z_OK )
+ {
+ Log( LOG_ALERT, "Decompression error: code %d (ni=%d, ai=%d, no=%d, ao=%d)!?", result, in->next_in, in->avail_in, in->next_out, in->avail_out );
+ Conn_Close( Idx, "Decompression error!", NULL, FALSE );
+ return FALSE;
+ }
+
+ in_len = My_Connections[Idx].zip.rdatalen - in->avail_in;
+ out_len = READBUFFER_LEN - My_Connections[Idx].rdatalen - 1 - in->avail_out;
+ My_Connections[Idx].rdatalen += out_len;
+
+ if( in->avail_in > 0 )
+ {
+ /* es konnten nicht alle Daten entpackt werden, vermutlich war
+ * im Ziel-Puffer kein Platz mehr. Umkopieren ... */
+ My_Connections[Idx].zip.rdatalen -= in_len;
+ memmove( My_Connections[Idx].zip.rbuf, My_Connections[Idx].zip.rbuf + in_len, My_Connections[Idx].zip.rdatalen );
+ }
+ else My_Connections[Idx].zip.rdatalen = 0;
+ My_Connections[Idx].zip.bytes_in += out_len;
+
+ return TRUE;
+} /* Unzip_Buffer */
+
+
+GLOBAL LONG
+Zip_SendBytes( CONN_ID Idx )
+{
+ /* Anzahl gesendeter Bytes (komprimiert!) liefern */
+
+ assert( Idx > NONE );
+ return My_Connections[Idx].zip.bytes_out;
+} /* Zip_SendBytes */
+
+
+GLOBAL LONG
+Zip_RecvBytes( CONN_ID Idx )
+{
+ /* Anzahl gesendeter Bytes (komprimiert!) liefern */
+
+ assert( Idx > NONE );
+ return My_Connections[Idx].zip.bytes_in;
+} /* Zip_RecvBytes */
+
+
+#endif
+
+
+/* -eof- */
projects / ngircd-alex.git / commitdiff