47  * State for a Deflate (de)compressor.
63 static void	z_comp_free(void *state);
64 static void	z_decomp_free(void *state);
65 static int	z_comp_init(void *state, unsigned char *options,
68 static int	z_decomp_init(void *state, unsigned char *options,
71 static int	z_compress(void *state, unsigned char *rptr,
74 static void	z_incomp(void *state, unsigned char *ibuf, int icnt);
75 static int	z_decompress(void *state, unsigned char *ibuf,
77 static void	z_comp_reset(void *state);
78 static void	z_decomp_reset(void *state);
79 static void	z_comp_stats(void *state, struct compstat *stats);
83  *	@arg:	pointer to the private state for the compressor.
87 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_comp_free()  local
89 	if (state) {  in z_comp_free()
90 		zlib_deflateEnd(&state->strm);  in z_comp_free()
91 		vfree(state->strm.workspace);  in z_comp_free()
92 		kfree(state);  in z_comp_free()
107  *	Returns the pointer to the private state for the compressor,
112 	struct ppp_deflate_state *state;  in z_comp_alloc()  local
125 	state = kzalloc(sizeof(*state),  in z_comp_alloc()
127 	if (state == NULL)  in z_comp_alloc()
130 	state->strm.next_in   = NULL;  in z_comp_alloc()
131 	state->w_size         = w_size;  in z_comp_alloc()
132 	state->strm.workspace = vmalloc(zlib_deflate_workspacesize(-w_size, 8));  in z_comp_alloc()
133 	if (state->strm.workspace == NULL)  in z_comp_alloc()
136 	if (zlib_deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION,  in z_comp_alloc()
140 	return (void *) state;  in z_comp_alloc()
143 	z_comp_free(state);  in z_comp_alloc()
149  *	@arg:	pointer to the private state for the compressor
165 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_comp_init()  local
171 	    DEFLATE_SIZE(options[2]) != state->w_size ||  in z_comp_init()
175 	state->seqno = 0;  in z_comp_init()
176 	state->unit  = unit;  in z_comp_init()
177 	state->debug = debug;  in z_comp_init()
179 	zlib_deflateReset(&state->strm);  in z_comp_init()
186  *	@arg:	pointer to private state for the compressor.
193 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_comp_reset()  local
195 	state->seqno = 0;  in z_comp_reset()
196 	zlib_deflateReset(&state->strm);  in z_comp_reset()
201  *	@arg:	pointer to private state for the compressor
213 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_compress()  local
238 	put_unaligned_be16(state->seqno, wptr);  in z_compress()
241 	state->strm.next_out = wptr;  in z_compress()
242 	state->strm.avail_out = oavail = osize - olen;  in z_compress()
243 	++state->seqno;  in z_compress()
247 	state->strm.next_in = rptr;  in z_compress()
248 	state->strm.avail_in = (isize - off);  in z_compress()
251 		r = zlib_deflate(&state->strm, Z_PACKET_FLUSH);  in z_compress()
253 			if (state->debug)  in z_compress()
258 		if (state->strm.avail_out == 0) {  in z_compress()
260 			state->strm.next_out = NULL;  in z_compress()
261 			state->strm.avail_out = oavail = 1000000;  in z_compress()
266 	olen += oavail - state->strm.avail_out;  in z_compress()
272 		state->stats.comp_bytes += olen;  in z_compress()
273 		state->stats.comp_packets++;  in z_compress()
275 		state->stats.inc_bytes += isize;  in z_compress()
276 		state->stats.inc_packets++;  in z_compress()
279 	state->stats.unc_bytes += isize;  in z_compress()
280 	state->stats.unc_packets++;  in z_compress()
293 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_comp_stats()  local
295 	*stats = state->stats;  in z_comp_stats()
304 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_decomp_free()  local
306 	if (state) {  in z_decomp_free()
307 		zlib_inflateEnd(&state->strm);  in z_decomp_free()
308 		vfree(state->strm.workspace);  in z_decomp_free()
309 		kfree(state);  in z_decomp_free()
324  *	Returns the pointer to the private state for the decompressor,
329 	struct ppp_deflate_state *state;  in z_decomp_alloc()  local
342 	state = kzalloc(sizeof(*state), GFP_KERNEL);  in z_decomp_alloc()
343 	if (state == NULL)  in z_decomp_alloc()
346 	state->w_size         = w_size;  in z_decomp_alloc()
347 	state->strm.next_out  = NULL;  in z_decomp_alloc()
348 	state->strm.workspace = vmalloc(zlib_inflate_workspacesize());  in z_decomp_alloc()
349 	if (state->strm.workspace == NULL)  in z_decomp_alloc()
352 	if (zlib_inflateInit2(&state->strm, -w_size) != Z_OK)  in z_decomp_alloc()
354 	return (void *) state;  in z_decomp_alloc()
357 	z_decomp_free(state);  in z_decomp_alloc()
363  *	@arg:	pointer to the private state for the decompressor
380 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_decomp_init()  local
386 	    DEFLATE_SIZE(options[2]) != state->w_size ||  in z_decomp_init()
390 	state->seqno = 0;  in z_decomp_init()
391 	state->unit  = unit;  in z_decomp_init()
392 	state->debug = debug;  in z_decomp_init()
393 	state->mru   = mru;  in z_decomp_init()
395 	zlib_inflateReset(&state->strm);  in z_decomp_init()
402  *	@arg:	pointer to private state for the decompressor.
409 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_decomp_reset()  local
411 	state->seqno = 0;  in z_decomp_reset()
412 	zlib_inflateReset(&state->strm);  in z_decomp_reset()
417  *	@arg:	pointer to private state for the decompressor
439 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_decompress()  local
445 		if (state->debug)  in z_decompress()
447 			       state->unit, isize);  in z_decompress()
453 	if (seq != (state->seqno & 0xffff)) {  in z_decompress()
454 		if (state->debug)  in z_decompress()
456 			       state->unit, seq, state->seqno & 0xffff);  in z_decompress()
459 	++state->seqno;  in z_decompress()
474 	state->strm.next_in = ibuf + PPP_HDRLEN + DEFLATE_OVHD;  in z_decompress()
475 	state->strm.avail_in = isize - (PPP_HDRLEN + DEFLATE_OVHD);  in z_decompress()
476 	state->strm.next_out = obuf + 3;  in z_decompress()
477 	state->strm.avail_out = 1;  in z_decompress()
485 		r = zlib_inflate(&state->strm, Z_PACKET_FLUSH);  in z_decompress()
487 			if (state->debug)  in z_decompress()
489 				       state->unit, r, (state->strm.msg? state->strm.msg: ""));  in z_decompress()
492 		if (state->strm.avail_out != 0)  in z_decompress()
495 			state->strm.avail_out = osize - PPP_HDRLEN;  in z_decompress()
499 				--state->strm.next_out;  in z_decompress()
500 				++state->strm.avail_out;  in z_decompress()
509 			state->strm.next_out = overflow_buf;  in z_decompress()
510 			state->strm.avail_out = 1;  in z_decompress()
513 			if (state->debug)  in z_decompress()
515 				       state->unit);  in z_decompress()
521 		if (state->debug)  in z_decompress()
523 			       state->unit);  in z_decompress()
527 	olen = osize + overflow - state->strm.avail_out;  in z_decompress()
528 	state->stats.unc_bytes += olen;  in z_decompress()
529 	state->stats.unc_packets++;  in z_decompress()
530 	state->stats.comp_bytes += isize;  in z_decompress()
531 	state->stats.comp_packets++;  in z_decompress()
538  *	@arg:	pointer to private state for the decompressor
544 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;  in z_incomp()  local
554 	++state->seqno;  in z_incomp()
560 	state->strm.next_in = ibuf + 3;  in z_incomp()
561 	state->strm.avail_in = icnt - 3;  in z_incomp()
563 		--state->strm.next_in;  in z_incomp()
564 		++state->strm.avail_in;  in z_incomp()
567 	r = zlib_inflateIncomp(&state->strm);  in z_incomp()
570 		if (state->debug) {  in z_incomp()
572 			       state->unit, r, (state->strm.msg? state->strm.msg: ""));  in z_incomp()
580 	state->stats.inc_bytes += icnt;  in z_incomp()
581 	state->stats.inc_packets++;  in z_incomp()
582 	state->stats.unc_bytes += icnt;  in z_incomp()
583 	state->stats.unc_packets++;  in z_incomp()