ngircd-tor/src/ngircd/conn-zip.c

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/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001-2007 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.
*/
#include "portab.h"
/**
* @file
* Connection compression using ZLIB
*/
#define CONN_MODULE
#ifdef ZLIB
/* enable more zlib related debug messages: */
/* #define DEBUG_ZLIB */
#include "imp.h"
#include <assert.h>
#include <string.h>
#include <zlib.h>
#include "conn.h"
#include "conn-func.h"
#include "log.h"
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#include "array.h"
#include "exp.h"
#include "conn-zip.h"
GLOBAL bool
Zip_InitConn( CONN_ID Idx )
{
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/* initialize zlib compression on this link */
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;
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if (inflateInit( &My_Connections[Idx].zip.in ) != Z_OK) {
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;
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if (deflateInit( &My_Connections[Idx].zip.out, Z_DEFAULT_COMPRESSION ) != Z_OK) {
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;
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Log(LOG_INFO, "Enabled link compression (zlib) on connection %d.", Idx);
Conn_OPTION_ADD( &My_Connections[Idx], CONN_ZIP );
return true;
} /* Zip_InitConn */
/**
* Copy data to the compression buffer of a connection. We do collect
* some data there until it's full so that we can achieve better
* compression ratios.
* If the (pre-)compression buffer is full, we try to flush it ("actually
* compress some data") and to add the new (uncompressed) data afterwards.
* This function closes the connection on error.
* @param Idx Connection handle.
* @param Data Pointer to the data.
* @param Len Length of the data to add.
* @return true on success, false otherwise.
*/
GLOBAL bool
Zip_Buffer( CONN_ID Idx, const char *Data, size_t Len )
{
size_t buflen;
assert( Idx > NONE );
assert( Data != NULL );
assert( Len > 0 );
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buflen = array_bytes(&My_Connections[Idx].zip.wbuf);
if (buflen + Len >= WRITEBUFFER_SLINK_LEN) {
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/* compression buffer is full, flush */
if( ! Zip_Flush( Idx )) return false;
}
/* check again; if zip buf is still too large do not append data:
* otherwise the zip wbuf would grow too large */
buflen = array_bytes(&My_Connections[Idx].zip.wbuf);
if (buflen + Len >= WRITEBUFFER_SLINK_LEN) {
Log(LOG_ALERT, "Zip Write Buffer overflow: %lu bytes\n", buflen + Len);
Conn_Close(Idx, "Zip Write buffer overflow", NULL, false);
return false;
}
return array_catb(&My_Connections[Idx].zip.wbuf, Data, Len);
} /* Zip_Buffer */
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/**
* Compress data in ZIP buffer and move result to the write buffer of
* the connection.
* This function closes the connection on error.
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* @param Idx Connection handle.
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* @return true on success, false otherwise.
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*/
GLOBAL bool
Zip_Flush( CONN_ID Idx )
{
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int result;
unsigned char zipbuf[WRITEBUFFER_SLINK_LEN];
int zipbuf_used = 0;
z_stream *out;
out = &My_Connections[Idx].zip.out;
out->avail_in = (uInt)array_bytes(&My_Connections[Idx].zip.wbuf);
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if (!out->avail_in)
return true; /* nothing to do. */
out->next_in = array_start(&My_Connections[Idx].zip.wbuf);
assert(out->next_in != NULL);
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out->next_out = zipbuf;
out->avail_out = (uInt)sizeof zipbuf;
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#ifdef DEBUG_ZIP
Log(LOG_DEBUG, "out->avail_in %d, out->avail_out %d",
out->avail_in, out->avail_out);
#endif
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;
}
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if (out->avail_out <= 0) {
/* Not all data was compressed, because data became
* bigger while compressing it. */
Log (LOG_ALERT, "Compression error: buffer overvlow!?");
Conn_Close(Idx, "Compression error!", NULL, false);
return false;
}
assert(out->avail_out <= WRITEBUFFER_SLINK_LEN);
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zipbuf_used = WRITEBUFFER_SLINK_LEN - out->avail_out;
#ifdef DEBUG_ZIP
Log(LOG_DEBUG, "zipbuf_used: %d", zipbuf_used);
#endif
if (!array_catb(&My_Connections[Idx].wbuf,
(char *)zipbuf, (size_t) zipbuf_used)) {
Log (LOG_ALERT, "Compression error: can't copy data!?");
Conn_Close(Idx, "Compression error!", NULL, false);
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return false;
}
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My_Connections[Idx].bytes_out += zipbuf_used;
My_Connections[Idx].zip.bytes_out += array_bytes(&My_Connections[Idx].zip.wbuf);
array_trunc(&My_Connections[Idx].zip.wbuf);
return true;
} /* Zip_Flush */
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/**
* uncompress data and copy it to read buffer.
* Returns true if data has been unpacked or no
* compressed data is currently pending in the zread buffer.
* This function closes the connection on error.
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* @param Idx Connection handle.
* @return true on success, false otherwise.
*/
GLOBAL bool
Unzip_Buffer( CONN_ID Idx )
{
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int result;
unsigned char unzipbuf[READBUFFER_LEN];
int unzipbuf_used = 0;
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unsigned int z_rdatalen;
unsigned int in_len;
z_stream *in;
assert( Idx > NONE );
z_rdatalen = (unsigned int)array_bytes(&My_Connections[Idx].zip.rbuf);
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if (z_rdatalen == 0)
return true;
in = &My_Connections[Idx].zip.in;
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in->next_in = array_start(&My_Connections[Idx].zip.rbuf);
assert(in->next_in != NULL);
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in->avail_in = z_rdatalen;
in->next_out = unzipbuf;
in->avail_out = (uInt)sizeof unzipbuf;
#ifdef DEBUG_ZIP
Log(LOG_DEBUG, "in->avail_in %d, in->avail_out %d",
in->avail_in, in->avail_out);
#endif
result = inflate( in, Z_SYNC_FLUSH );
if( result != Z_OK )
{
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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);
Conn_Close(Idx, "Decompression error!", NULL, false);
return false;
}
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assert(z_rdatalen >= in->avail_in);
in_len = z_rdatalen - in->avail_in;
unzipbuf_used = READBUFFER_LEN - in->avail_out;
#ifdef DEBUG_ZIP
Log(LOG_DEBUG, "unzipbuf_used: %d - %d = %d", READBUFFER_LEN,
in->avail_out, unzipbuf_used);
#endif
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assert(unzipbuf_used <= READBUFFER_LEN);
if (!array_catb(&My_Connections[Idx].rbuf, (char*) unzipbuf,
(size_t)unzipbuf_used)) {
Log (LOG_ALERT, "Decompression error: can't copy data!?");
Conn_Close(Idx, "Decompression error!", NULL, false);
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return false;
}
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if( in->avail_in > 0 ) {
array_moveleft(&My_Connections[Idx].zip.rbuf, 1, in_len );
} else {
array_trunc( &My_Connections[Idx].zip.rbuf );
My_Connections[Idx].zip.bytes_in += unzipbuf_used;
}
return true;
} /* Unzip_Buffer */
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/**
* @param Idx Connection handle.
* @return amount of sent (compressed) bytes
*/
GLOBAL long
Zip_SendBytes( CONN_ID Idx )
{
assert( Idx > NONE );
return My_Connections[Idx].zip.bytes_out;
} /* Zip_SendBytes */
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/**
* @param Idx Connection handle.
* @return amount of received (compressed) bytes
*/
GLOBAL long
Zip_RecvBytes( CONN_ID Idx )
{
assert( Idx > NONE );
return My_Connections[Idx].zip.bytes_in;
} /* Zip_RecvBytes */
#endif
/* -eof- */