patch-2.4.7 linux/net/irda/compressors/irda_deflate.c

• Lines: 635
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.6/linux/net/irda/compressors/irda_deflate.c
• Orig date: Fri Feb 9 11:29:44 2001

diff -u --recursive --new-file v2.4.6/linux/net/irda/compressors/irda_deflate.c linux/net/irda/compressors/irda_deflate.c
@@ -1,634 +0,0 @@
-/*********************************************************************
- *                
- * Filename:      irda_deflate.c
- * Version:       
- * Description:   
- * Status:        Experimental.
- * Author:        Dag Brattli <dagb@cs.uit.no>
- * Created at:    Fri Oct  9 02:52:08 1998
- * Modified at:   Mon Dec 14 19:48:54 1998
- * Modified by:   Dag Brattli <dagb@cs.uit.no>
- * 
- *  ==FILEVERSION 980319==
- *
- * irda_deflate.c - interface the zlib procedures for Deflate compression
- * and decompression (as used by gzip) to the IrDA code.
- * This version is for use with Linux kernel 2.1.X.
- *
- * Copyright (c) 1994 The Australian National University.
- * All rights reserved.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation is hereby granted, provided that the above copyright
- * notice appears in all copies.  This software is provided without any
- * warranty, express or implied. The Australian National University
- * makes no representations about the suitability of this software for
- * any purpose.
- *
- * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
- * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
- * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
- * THE AUSTRALIAN NATIONAL UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
- * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
- * OR MODIFICATIONS.
- *
- * From: deflate.c,v 1.1 1996/01/18 03:17:48 paulus Exp
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-#include <linux/fcntl.h>
-#include <linux/interrupt.h>
-#include <linux/ptrace.h>
-#include <linux/ioport.h>
-#include <linux/in.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h> 
-#include <linux/errno.h>
-#include <linux/string.h>	/* used in new tty drivers */
-#include <linux/signal.h>	/* used in new tty drivers */
-
-#include <asm/system.h>
-
-#include <linux/netdevice.h>
-#include <linux/skbuff.h>
-#include <linux/inet.h>
-#include <linux/ioctl.h>
-
-#include <linux/ppp_defs.h>
-#include <linux/ppp-comp.h>
-
-/*
- * This is not that nice, but what can we do when the code has been placed
- * elsewhere
- */
-
-#include "../../../drivers/net/zlib.c"
-
-/*
- * State for a Deflate (de)compressor.
- */
-struct irda_deflate_state {
-    int		seqno;
-    int		w_size;
-    int		unit;
-    int		mru;
-    int		debug;
-    z_stream	strm;
-    struct compstat stats;
-};
-
-#define DEFLATE_OVHD	2		/* Deflate overhead/packet */
-
-static void	*zalloc __P((void *, unsigned int items, unsigned int size));
-static void	*zalloc_init __P((void *, unsigned int items,
-				  unsigned int size));
-static void	zfree __P((void *, void *ptr));
-static void	*z_comp_alloc __P((unsigned char *options, int opt_len));
-static void	*z_decomp_alloc __P((unsigned char *options, int opt_len));
-static void	z_comp_free __P((void *state));
-static void	z_decomp_free __P((void *state));
-static int	z_comp_init __P((void *state, unsigned char *options,
-				 int opt_len,
-				 int unit, int hdrlen, int debug));
-static int	z_decomp_init __P((void *state, unsigned char *options,
-				   int opt_len,
-				   int unit, int hdrlen, int mru, int debug));
-static int	z_compress __P((void *state, unsigned char *rptr,
-				unsigned char *obuf,
-				int isize, int osize));
-static void	z_incomp __P((void *state, unsigned char *ibuf, int icnt));
-static int	z_decompress __P((void *state, unsigned char *ibuf,
-				int isize, unsigned char *obuf, int osize));
-static void	z_comp_reset __P((void *state));
-static void	z_decomp_reset __P((void *state));
-static void	z_comp_stats __P((void *state, struct compstat *stats));
-
-struct chunk_header {
-	int valloced;		/* allocated with valloc, not kmalloc */
-	int guard;		/* check for overwritten header */
-};
-
-#define GUARD_MAGIC	0x77a8011a
-#define MIN_VMALLOC	2048	/* use kmalloc for blocks < this */
-
-/*
- * Space allocation and freeing routines for use by zlib routines.
- */
-void zfree(void *arg, void *ptr)
-{
-	struct chunk_header *hdr = ((struct chunk_header *)ptr) - 1;
-	
-	if (hdr->guard != GUARD_MAGIC) {
-		printk(KERN_WARNING "zfree: header corrupted (%x %x) at %p\n",
-		       hdr->valloced, hdr->guard, hdr);
-		return;
-	}
-	if (hdr->valloced)
-		vfree(hdr);
-	else
-		kfree(hdr);
-}
-
-void *
-zalloc(arg, items, size)
-    void *arg;
-    unsigned int items, size;
-{
-	struct chunk_header *hdr;
-	unsigned nbytes;
-
-	nbytes = items * size + sizeof(*hdr);
-	hdr = kmalloc(nbytes, GFP_ATOMIC);
-	if (hdr == 0)
-		return 0;
-	hdr->valloced = 0;
-	hdr->guard = GUARD_MAGIC;
-	return (void *) (hdr + 1);
-}
-
-void * zalloc_init(void *arg, unsigned int items, unsigned int size)
-{
-	struct chunk_header *hdr;
-	unsigned nbytes;
-
-	nbytes = items * size + sizeof(*hdr);
-	if (nbytes >= MIN_VMALLOC)
-		hdr = vmalloc(nbytes);
-	else
-		hdr = kmalloc(nbytes, GFP_KERNEL);
-	if (hdr == 0)
-		return 0;
-	hdr->valloced = nbytes >= MIN_VMALLOC;
-	hdr->guard = GUARD_MAGIC;
-	return (void *) (hdr + 1);
-}
-
-static void
-z_comp_free(arg)
-    void *arg;
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-
-	if (state) {
-		deflateEnd(&state->strm);
-		kfree(state);
-		MOD_DEC_USE_COUNT;
-	}
-}
-
-/*
- * Allocate space for a compressor.
- */
-static void *
-z_comp_alloc(options, opt_len)
-    unsigned char *options;
-    int opt_len;
-{
-	struct irda_deflate_state *state;
-	int w_size;
-
-	if (opt_len != CILEN_DEFLATE
-	    || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
-	    || options[1] != CILEN_DEFLATE
-	    || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
-	    || options[3] != DEFLATE_CHK_SEQUENCE)
-		return NULL;
-	w_size = DEFLATE_SIZE(options[2]);
-	w_size = MAX_WBITS;
-	if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
-		return NULL;
-
-	state = (struct irda_deflate_state *) kmalloc(sizeof(*state), GFP_KERNEL);
-	if (state == NULL)
-		return NULL;
-
-	MOD_INC_USE_COUNT;
-	memset (state, 0, sizeof (struct irda_deflate_state));
-	state->strm.next_in = NULL;
-	state->strm.zalloc  = zalloc_init;
-	state->strm.zfree   = zfree;
-	state->w_size       = w_size;
-
-	if (deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION,
-			 DEFLATE_METHOD_VAL, -w_size, 8, Z_DEFAULT_STRATEGY)
-	    != Z_OK)
-		goto out_free;
-	state->strm.zalloc = zalloc;
-	return (void *) state;
-
-out_free:
-	z_comp_free(state);
-	MOD_DEC_USE_COUNT;
-	return NULL;
-}
-
-static int
-z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
-    void *arg;
-    unsigned char *options;
-    int opt_len, unit, hdrlen, debug;
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-
-	if (opt_len < CILEN_DEFLATE
-	    || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
-	    || options[1] != CILEN_DEFLATE
-	    || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
-	    || DEFLATE_SIZE(options[2]) != state->w_size
-	    || options[3] != DEFLATE_CHK_SEQUENCE)
-		return 0;
-
-	state->seqno = 0;
-	state->unit  = unit;
-	state->debug = debug;
-
-	deflateReset(&state->strm);
-
-	return 1;
-}
-
-static void z_comp_reset(void *arg)
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-
-	state->seqno = 0;
-	deflateReset(&state->strm);
-}
-
-int
-z_compress(arg, rptr, obuf, isize, osize)
-    void *arg;
-    unsigned char *rptr;	/* uncompressed packet (in) */
-    unsigned char *obuf;	/* compressed packet (out) */
-    int isize, osize;
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-	int r, olen, oavail;
-
-	olen = 0;
-
-	/* Don't generate compressed packets which are larger than
-	   the uncompressed packet. */
-	if (osize > isize)
-		osize = isize;
-
-	state->strm.next_out = obuf;
-	state->strm.avail_out = oavail = osize;
-
-	state->strm.next_in = rptr;
-	state->strm.avail_in = isize;
-
-	for (;;) {
-		r = deflate(&state->strm, Z_PACKET_FLUSH);
-		if (r != Z_OK) {
-			if (state->debug)
-				printk(KERN_ERR
-				       "z_compress: deflate returned %d\n", r);
-			break;
-		}
-		if (state->strm.avail_out == 0) {
-			olen += oavail;
-			state->strm.next_out = NULL;
-			state->strm.avail_out = oavail = 1000000;
-		} else {
-			break;		/* all done */
-		}
-	}
-	olen += oavail - state->strm.avail_out;
-
-	/*
-	 * See if we managed to reduce the size of the packet.
-	 */
-	if (olen < isize) {
-		state->stats.comp_bytes += olen;
-		state->stats.comp_packets++;
-	} else {
-		state->stats.inc_bytes += isize;
-		state->stats.inc_packets++;
-		olen = 0;
-	}
-	state->stats.unc_bytes += isize;
-	state->stats.unc_packets++;
-
-	return olen;
-}
-
-static void
-z_comp_stats(arg, stats)
-    void *arg;
-    struct compstat *stats;
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-
-	*stats = state->stats;
-}
-
-static void z_decomp_free(void *arg)
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-
-	if (state) {
-		inflateEnd(&state->strm);
-		kfree(state);
-		MOD_DEC_USE_COUNT;
-	}
-}
-
-/*
- * Allocate space for a decompressor.
- */
-static void *
-z_decomp_alloc(options, opt_len)
-    unsigned char *options;
-    int opt_len;
-{
-	struct irda_deflate_state *state;
-	int w_size;
-
-	if (opt_len != CILEN_DEFLATE
-	    || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
-	    || options[1] != CILEN_DEFLATE
-	    || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
-	    || options[3] != DEFLATE_CHK_SEQUENCE)
-		return NULL;
-	w_size = DEFLATE_SIZE(options[2]);
-	w_size = MAX_WBITS;
-	if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
-		return NULL;
-
-	state = (struct irda_deflate_state *) kmalloc(sizeof(*state), GFP_KERNEL);
-	if (state == NULL)
-		return NULL;
-
-	MOD_INC_USE_COUNT;
-	memset (state, 0, sizeof (struct irda_deflate_state));
-	state->w_size        = w_size;
-	state->strm.next_out = NULL;
-	state->strm.zalloc   = zalloc_init;
-	state->strm.zfree    = zfree;
-
-	if (inflateInit2(&state->strm, -w_size) != Z_OK)
-		goto out_free;
-	state->strm.zalloc = zalloc;
-	return (void *) state;
-
-out_free:
-	z_decomp_free(state);
-	MOD_DEC_USE_COUNT;
-	return NULL;
-}
-
-static int
-z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
-    void *arg;
-    unsigned char *options;
-    int opt_len, unit, hdrlen, mru, debug;
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-
-	if (opt_len < CILEN_DEFLATE
-	    || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
-	    || options[1] != CILEN_DEFLATE
-	    || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
-	    || DEFLATE_SIZE(options[2]) != state->w_size
-	    || options[3] != DEFLATE_CHK_SEQUENCE)
-		return 0;
-
-	state->seqno = 0;
-	state->unit  = unit;
-	state->debug = debug;
-	state->mru   = mru;
-
-	inflateReset(&state->strm);
-
-	return 1;
-}
-
-static void z_decomp_reset(void *arg)
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-
-	state->seqno = 0;
-	inflateReset(&state->strm);
-}
-
-/*
- * Decompress a Deflate-compressed packet.
- *
- * Because of patent problems, we return DECOMP_ERROR for errors
- * found by inspecting the input data and for system problems, but
- * DECOMP_FATALERROR for any errors which could possibly be said to
- * be being detected "after" decompression.  For DECOMP_ERROR,
- * we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be
- * infringing a patent of Motorola's if we do, so we take CCP down
- * instead.
- *
- * Given that the frame has the correct sequence number and a good FCS,
- * errors such as invalid codes in the input most likely indicate a
- * bug, so we return DECOMP_FATALERROR for them in order to turn off
- * compression, even though they are detected by inspecting the input.
- */
-int
-z_decompress(arg, ibuf, isize, obuf, osize)
-    void *arg;
-    unsigned char *ibuf;
-    int isize;
-    unsigned char *obuf;
-    int osize;
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-	int olen, r;
-	int overflow;
-	unsigned char overflow_buf[1];
-
-	if (isize <= DEFLATE_OVHD) {
-		if (state->debug)
-			printk(KERN_DEBUG "z_decompress%d: short pkt (%d)\n",
-			       state->unit, isize);
-		return DECOMP_ERROR;
-	}
-
-	/*
-	 * Set up to call inflate.
-	 */
-	state->strm.next_in = ibuf;
-	state->strm.avail_in = isize;
-	state->strm.next_out = obuf;
-	state->strm.avail_out = osize;
-	overflow = 0;
-
-	/*
-	 * Call inflate, supplying more input or output as needed.
-	 */
-	for (;;) {
-		r = inflate(&state->strm, Z_PACKET_FLUSH);
-		if (r != Z_OK) {
-			if (state->debug)
-				printk(KERN_DEBUG "z_decompress%d: inflate returned %d (%s)\n",
-				       state->unit, r, (state->strm.msg? state->strm.msg: ""));
-			return DECOMP_FATALERROR;
-		}
-		if (state->strm.avail_out != 0)
-			break;		/* all done */
-		
-		if (!overflow) {
-			/*
-			 * We've filled up the output buffer; the only way to
-			 * find out whether inflate has any more characters
-			 * left is to give it another byte of output space.
-			 */
-			state->strm.next_out = overflow_buf;
-			state->strm.avail_out = 1;
-			overflow = 1;
-		} else {
-			if (state->debug)
-				printk(KERN_DEBUG "z_decompress%d: ran out of mru\n",
-				       state->unit);
-			return DECOMP_FATALERROR;
-		}
-	}
-
-	olen = osize + overflow - state->strm.avail_out;
-	state->stats.unc_bytes += olen;
-	state->stats.unc_packets++;
-	state->stats.comp_bytes += isize;
-	state->stats.comp_packets++;
-
-	return olen;
-}
-
-/*
- * Incompressible data has arrived - add it to the history.
- */
-static void
-z_incomp(arg, ibuf, icnt)
-    void *arg;
-    unsigned char *ibuf;
-    int icnt;
-{
-	struct irda_deflate_state *state = (struct irda_deflate_state *) arg;
-	int r;
-
-	/*
-	 * Check that the protocol is one we handle.
-	 */
-
-	/*
-	 * We start at the either the 1st or 2nd byte of the protocol field,
-	 * depending on whether the protocol value is compressible.
-	 */
-	state->strm.next_in = ibuf;
-	state->strm.avail_in = icnt;
-
-	r = inflateIncomp(&state->strm);
-	if (r != Z_OK) {
-		/* gak! */
-		if (state->debug) {
-			printk(KERN_DEBUG "z_incomp%d: inflateIncomp returned %d (%s)\n",
-			       state->unit, r, (state->strm.msg? state->strm.msg: ""));
-		}
-		return;
-	}
-
-	/*
-	 * Update stats.
-	 */
-	state->stats.inc_bytes += icnt;
-	state->stats.inc_packets++;
-	state->stats.unc_bytes += icnt;
-	state->stats.unc_packets++;
-}
-
-/*************************************************************
- * Module interface table
- *************************************************************/
-
-/* These are in ppp.c */
-extern int  irda_register_compressor   (struct compressor *cp);
-extern void irda_unregister_compressor (struct compressor *cp);
-
-/*
- * Procedures exported to if_ppp.c.
- */
-static struct compressor irda_deflate = {
-compress_proto:	CI_DEFLATE,
-comp_alloc:	z_comp_alloc,
-comp_free:	z_comp_free,
-comp_init:	z_comp_init,
-comp_reset:	z_comp_reset,
-compress:	z_compress,
-comp_stat:	z_comp_stats,
-decomp_alloc:	z_decomp_alloc,
-decomp_free:	z_decomp_free,
-decomp_init:	z_decomp_init,
-decomp_reset:	z_decomp_reset,
-decompress:	z_decompress,
-incomp:		z_incomp,
-decomp_stat:	z_comp_stats
-};
-
-static struct compressor irda_deflate_draft = {
-compress_proto:	CI_DEFLATE_DRAFT,
-comp_alloc:	z_comp_alloc,
-comp_free:	z_comp_free,
-comp_init:	z_comp_init,
-comp_reset:	z_comp_reset,
-compress:	z_compress,
-comp_stat:	z_comp_stats,
-decomp_alloc:	z_decomp_alloc,
-decomp_free:	z_decomp_free,
-decomp_init:	z_decomp_init,
-decomp_reset:	z_decomp_reset,
-decompress:	z_decompress,
-incomp:		z_incomp,
-decomp_stat:	z_comp_stats
-};
-
-int __init irda_deflate_init(void)
-{
-        int answer = irda_register_compressor ( &irda_deflate);
-        if (answer == 0)
-                printk (KERN_INFO
-			"IrDA Deflate Compression module registered\n");
-	irda_register_compressor( &irda_deflate_draft);
-        return answer;
-}
-
-void irda_deflate_cleanup(void)
-{
-
-	irda_unregister_compressor (&irda_deflate);
-	irda_unregister_compressor (&irda_deflate_draft);
-}
-
-#ifdef MODULE
-/*************************************************************
- * Module support routines
- *************************************************************/
-
-int init_module(void)
-{  
-	return irda_deflate_init();
-}
-     
-void
-cleanup_module(void)
-{
-	if (MOD_IN_USE)
-		printk (KERN_INFO
-			"Deflate Compression module busy, remove delayed\n");
-	else {
-		irda_deflate_cleanup();
-	}
-}
-#endif