276 lines
7.1 KiB
C
276 lines
7.1 KiB
C
/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001-2007 Alexander Barton (alex@barton.de)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* Please read the file COPYING, README and AUTHORS for more information.
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*
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* Connection compression using ZLIB
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*/
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#include "portab.h"
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#define CONN_MODULE
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#ifdef ZLIB
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/* enable more zlib related debug messages: */
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/* #define DEBUG_ZLIB */
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static char UNUSED id[] = "$Id: conn-zip.c,v 1.16 2007/05/17 23:34:24 alex Exp $";
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#include "imp.h"
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#include <assert.h>
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#include <string.h>
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#include <zlib.h>
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#include "conn.h"
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#include "conn-func.h"
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#include "log.h"
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#include "array.h"
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#include "exp.h"
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#include "conn-zip.h"
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GLOBAL bool
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Zip_InitConn( CONN_ID Idx )
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{
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/* Kompression fuer Link initialisieren */
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assert( Idx > NONE );
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My_Connections[Idx].zip.in.avail_in = 0;
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My_Connections[Idx].zip.in.total_in = 0;
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My_Connections[Idx].zip.in.total_out = 0;
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My_Connections[Idx].zip.in.zalloc = NULL;
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My_Connections[Idx].zip.in.zfree = NULL;
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My_Connections[Idx].zip.in.data_type = Z_ASCII;
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if( inflateInit( &My_Connections[Idx].zip.in ) != Z_OK )
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{
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/* Fehler! */
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Log( LOG_ALERT, "Can't initialize compression on connection %d (zlib inflate)!", Idx );
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return false;
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}
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My_Connections[Idx].zip.out.total_in = 0;
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My_Connections[Idx].zip.out.total_in = 0;
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My_Connections[Idx].zip.out.zalloc = NULL;
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My_Connections[Idx].zip.out.zfree = NULL;
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My_Connections[Idx].zip.out.data_type = Z_ASCII;
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if( deflateInit( &My_Connections[Idx].zip.out, Z_DEFAULT_COMPRESSION ) != Z_OK )
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{
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/* Fehler! */
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Log( LOG_ALERT, "Can't initialize compression on connection %d (zlib deflate)!", Idx );
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return false;
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}
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My_Connections[Idx].zip.bytes_in = My_Connections[Idx].bytes_in;
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My_Connections[Idx].zip.bytes_out = My_Connections[Idx].bytes_out;
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Log( LOG_INFO, "Enabled link compression (zlib) on connection %d.", Idx );
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Conn_OPTION_ADD( &My_Connections[Idx], CONN_ZIP );
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return true;
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} /* Zip_InitConn */
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/**
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* Copy data to the compression buffer of a connection. We do collect
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* some data there until it's full so that we can achieve better
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* compression ratios.
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* If the (pre-)compression buffer is full, we try to flush it ("actually
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* compress some data") and to add the new (uncompressed) data afterwards.
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* @param Idx Connection handle.
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* @param Data Pointer to the data.
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* @param Len Length of the data to add.
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* @return true on success, false otherwise. */
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GLOBAL bool
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Zip_Buffer( CONN_ID Idx, char *Data, size_t Len )
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{
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size_t buflen;
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assert( Idx > NONE );
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assert( Data != NULL );
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assert( Len > 0 );
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buflen = array_bytes(&My_Connections[Idx].zip.wbuf);
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if (buflen + Len >= WRITEBUFFER_SLINK_LEN) {
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/* compression buffer is full, flush */
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if( ! Zip_Flush( Idx )) return false;
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}
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/* check again; if zip buf is still too large do not append data:
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* otherwise the zip wbuf would grow too large */
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buflen = array_bytes(&My_Connections[Idx].zip.wbuf);
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if (buflen + Len >= WRITEBUFFER_SLINK_LEN)
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return false;
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return array_catb(&My_Connections[Idx].zip.wbuf, Data, Len);
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} /* Zip_Buffer */
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/**
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* Compress data in ZIP buffer and move result to the write buffer of
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* the connection.
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* @param Idx Connection handle.
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* @retrun true on success, false otherwise.
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*/
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GLOBAL bool
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Zip_Flush( CONN_ID Idx )
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{
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int result;
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unsigned char zipbuf[WRITEBUFFER_SLINK_LEN];
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int zipbuf_used = 0;
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z_stream *out;
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out = &My_Connections[Idx].zip.out;
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out->avail_in = (uInt)array_bytes(&My_Connections[Idx].zip.wbuf);
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if (!out->avail_in)
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return true; /* nothing to do. */
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out->next_in = array_start(&My_Connections[Idx].zip.wbuf);
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assert(out->next_in != NULL);
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out->next_out = zipbuf;
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out->avail_out = (uInt)sizeof zipbuf;
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#ifdef DEBUG_ZIP
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Log(LOG_DEBUG, "out->avail_in %d, out->avail_out %d",
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out->avail_in, out->avail_out);
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#endif
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result = deflate( out, Z_SYNC_FLUSH );
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if(( result != Z_OK ) || ( out->avail_in > 0 ))
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{
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Log( LOG_ALERT, "Compression error: code %d!?", result );
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Conn_Close( Idx, "Compression error!", NULL, false );
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return false;
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}
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if (out->avail_out <= 0) {
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/* Not all data was compressed, because data became
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* bigger while compressing it. */
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Log (LOG_ALERT, "Compression error: buffer overvlow!?");
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Conn_Close(Idx, "Compression error!", NULL, false);
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return false;
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}
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assert(out->avail_out <= WRITEBUFFER_SLINK_LEN);
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zipbuf_used = WRITEBUFFER_SLINK_LEN - out->avail_out;
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#ifdef DEBUG_ZIP
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Log(LOG_DEBUG, "zipbuf_used: %d", zipbuf_used);
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#endif
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if (!array_catb(&My_Connections[Idx].wbuf,
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(char *)zipbuf, (size_t) zipbuf_used)) {
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Log (LOG_ALERT, "Compression error: can't copy data!?");
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Conn_Close(Idx, "Compression error!", NULL, false);
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return false;
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}
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My_Connections[Idx].bytes_out += zipbuf_used;
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My_Connections[Idx].zip.bytes_out += array_bytes(&My_Connections[Idx].zip.wbuf);
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array_trunc(&My_Connections[Idx].zip.wbuf);
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return true;
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} /* Zip_Flush */
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GLOBAL bool
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Unzip_Buffer( CONN_ID Idx )
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{
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/* Daten entpacken und in Lesepuffer kopieren. Bei Fehlern
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* wird false geliefert, ansonsten true. Der Fall, dass keine
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* Daten mehr zu entpacken sind, ist _kein_ Fehler! */
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int result;
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unsigned char unzipbuf[READBUFFER_LEN];
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int unzipbuf_used = 0;
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unsigned int z_rdatalen;
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unsigned int in_len;
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z_stream *in;
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assert( Idx > NONE );
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z_rdatalen = (unsigned int)array_bytes(&My_Connections[Idx].zip.rbuf);
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if (z_rdatalen == 0)
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return true;
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in = &My_Connections[Idx].zip.in;
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in->next_in = array_start(&My_Connections[Idx].zip.rbuf);
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assert(in->next_in != NULL);
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in->avail_in = z_rdatalen;
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in->next_out = unzipbuf;
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in->avail_out = (uInt)sizeof unzipbuf;
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#ifdef DEBUG_ZIP
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Log(LOG_DEBUG, "in->avail_in %d, in->avail_out %d",
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in->avail_in, in->avail_out);
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#endif
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result = inflate( in, Z_SYNC_FLUSH );
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if( result != Z_OK )
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{
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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 );
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Conn_Close( Idx, "Decompression error!", NULL, false );
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return false;
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}
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assert(z_rdatalen >= in->avail_in);
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in_len = z_rdatalen - in->avail_in;
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unzipbuf_used = READBUFFER_LEN - in->avail_out;
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#ifdef DEBUG_ZIP
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Log(LOG_DEBUG, "unzipbuf_used: %d - %d = %d", READBUFFER_LEN,
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in->avail_out, unzipbuf_used);
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#endif
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assert(unzipbuf_used <= READBUFFER_LEN);
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if (!array_catb(&My_Connections[Idx].rbuf, (char*) unzipbuf,
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(size_t)unzipbuf_used))
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return false;
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if( in->avail_in > 0 ) {
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array_moveleft(&My_Connections[Idx].zip.rbuf, 1, in_len );
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} else {
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array_trunc( &My_Connections[Idx].zip.rbuf );
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My_Connections[Idx].zip.bytes_in += unzipbuf_used;
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}
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return true;
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} /* Unzip_Buffer */
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GLOBAL long
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Zip_SendBytes( CONN_ID Idx )
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{
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/* Anzahl gesendeter Bytes (komprimiert!) liefern */
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assert( Idx > NONE );
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return My_Connections[Idx].zip.bytes_out;
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} /* Zip_SendBytes */
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GLOBAL long
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Zip_RecvBytes( CONN_ID Idx )
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{
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/* Anzahl gesendeter Bytes (komprimiert!) liefern */
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assert( Idx > NONE );
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return My_Connections[Idx].zip.bytes_in;
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} /* Zip_RecvBytes */
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#endif
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/* -eof- */
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