zip.cpp@ 939

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1	/* $Id: zip.cpp 1 1970-01-01 00:00:00Z vboxsync $ */
2	/** @file
3	* InnoTek Portable Runtime - Compression.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/*******************************************************************************
24	* Defined Constants And Macros *
25	*******************************************************************************/
26	#define RTZIP_USE_STORE 1
27	//#define RTZIP_USE_ZLIB 1
28	//#define RTZIP_USE_BZLIB 1
29	#define RTZIP_USE_LZF 1
30
31
32	/*******************************************************************************
33	* Header Files *
34	*******************************************************************************/
35	#ifdef RTZIP_USE_BZLIB
36	# include <bzlib.h>
37	#endif
38	#ifdef RTZIP_USE_ZLIB
39	# include <zlib.h>
40	#endif
41	#ifdef RTZIP_USE_LZF
42	# include <lzf.h>
43	# include <iprt/crc32.h>
44	#endif
45
46	#include <iprt/zip.h>
47	#include <iprt/alloc.h>
48	#include <iprt/assert.h>
49	#include <iprt/err.h>
50	#include <iprt/log.h>
51	#include <iprt/string.h>
52
53	#include <errno.h>
54
55
56	/*******************************************************************************
57	* Structures and Typedefs *
58	*******************************************************************************/
59
60	#ifdef RTZIP_USE_LZF
61
62	/**
63	* LZF block header.
64	*/
65	#pragma pack(1) /* paranoia */
66	typedef struct RTZIPLZFHDR
67	{
68	/** Magic word (RTZIPLZFHDR_MAGIC). */
69	uint16_t u16Magic;
70	/** The number of bytes of data following this header. */
71	uint16_t cbData;
72	/** The CRC32 of the block. */
73	uint32_t u32CRC;
74	/** The size of the uncompressed data in bytes. */
75	uint16_t cbUncompressed;
76	} RTZIPLZFHDR;
77	#pragma pack()
78	/** Pointer to a LZF block header. */
79	typedef RTZIPLZFHDR *PRTZIPLZFHDR;
80	/** Pointer to a const LZF block header. */
81	typedef const RTZIPLZFHDR *PCRTZIPLZFHDR;
82
83	/** The magic of a LZF block header. */
84	#define RTZIPLZFHDR_MAGIC ('Z' \| ('V' << 8))
85
86	/** The max compressed data size.
87	* The maximum size of a block is currently 16KB.
88	* This is very important so we don't have to move input buffers around. */
89	#define RTZIPLZF_MAX_DATA_SIZE (16384 - sizeof(RTZIPLZFHDR))
90
91	/** The max uncompressed data size.
92	* This is important so we don't overflow the spill buffer in the decompressor. */
93	#define RTZIPLZF_MAX_UNCOMPRESSED_DATA_SIZE (32*_1K)
94
95	#endif /* RTZIP_USE_LZF */
96
97
98	/**
99	* Compressor/Decompressor instance data.
100	*/
101	typedef struct RTZIPCOMP
102	{
103	/** Output buffer. */
104	#ifdef RTZIP_USE_LZF
105	uint8_t abBuffer[128 * 1024];
106	#else
107	uint8_t abBuffer[64 * 1024];
108	#endif
109	/** Compression output consumer. */
110	PFNRTZIPOUT pfnOut;
111	/** User argument for the callback. */
112	void *pvUser;
113
114	/**
115	* @copydoc RTZipCompress
116	*/
117	DECLCALLBACKMEMBER(int, pfnCompress)(PRTZIPCOMP pZip, const void *pvBuf, size_t cbBuf);
118
119	/**
120	* @copydoc RTZipCompFinish
121	*/
122	DECLCALLBACKMEMBER(int, pfnFinish)(PRTZIPCOMP pZip);
123
124	/**
125	* @copydoc RTZipCompDestroy
126	*/
127	DECLCALLBACKMEMBER(int, pfnDestroy)(PRTZIPCOMP pZip);
128
129	/** Compression type. */
130	RTZIPTYPE enmType;
131	/** Type specific data. */
132	union
133	{
134	#ifdef RTZIP_USE_STORE
135	/** Simple storing. */
136	struct
137	{
138	/** Current buffer postition. (where to start write) */
139	uint8_t *pb;
140	} Store;
141	#endif
142	#ifdef RTZIP_USE_ZLIB
143	/** Zlib stream. */
144	z_stream Zlib;
145	#endif
146	#ifdef RTZIP_USE_BZLIB
147	/** BZlib stream. */
148	bz_stream BZlib;
149	#endif
150	#ifdef RTZIP_USE_LZF
151	/** LZF stream. */
152	struct
153	{
154	/** Current output buffer postition. */
155	uint8_t *pbOutput;
156	/** The input buffer position. */
157	uint8_t *pbInput;
158	/** The number of free bytes in the input buffer. */
159	size_t cbInputFree;
160	/** The input buffer. */
161	uint8_t abInput[RTZIPLZF_MAX_UNCOMPRESSED_DATA_SIZE];
162	} LZF;
163	#endif
164
165	} u;
166	} RTZIPCOMP;
167
168
169
170	/**
171	* Decompressor instance data.
172	*/
173	typedef struct RTZIPDECOMP
174	{
175	/** Input buffer. */
176	uint8_t abBuffer[1024 * 64];
177	/** Decompression input producer. */
178	PFNRTZIPIN pfnIn;
179	/** User argument for the callback. */
180	void *pvUser;
181
182	/**
183	* @copydoc RTZipDecompress
184	*/
185	DECLCALLBACKMEMBER(int, pfnDecompress)(PRTZIPDECOMP pZip, void pvBuf, size_t cbBuf, size_t pcbWritten);
186
187	/**
188	* @copydoc RTZipDecompDestroy
189	*/
190	DECLCALLBACKMEMBER(int, pfnDestroy)(PRTZIPDECOMP pZip);
191
192	/** Compression type. */
193	RTZIPTYPE enmType;
194	/** Type specific data. */
195	union
196	{
197	#ifdef RTZIP_USE_STORE
198	/** Simple storing. */
199	struct
200	{
201	/** Current buffer postition. (where to start read) */
202	uint8_t *pb;
203	/** Number of bytes left in the buffer. */
204	size_t cbBuffer;
205	} Store;
206	#endif
207	#ifdef RTZIP_USE_ZLIB
208	/** Zlib stream. */
209	z_stream Zlib;
210	#endif
211	#ifdef RTZIP_USE_BZLIB
212	/** BZlib stream. */
213	bz_stream BZlib;
214	#endif
215	#ifdef RTZIP_USE_LZF
216	/** LZF 'stream'. */
217	struct
218	{
219	/** Current input buffer postition. */
220	uint8_t *pbInput;
221	/** The number of bytes left in the input buffer. */
222	size_t cbInput;
223	/** The spill buffer.
224	* LZF is a block based compressor and not a stream compressor. So,
225	* we have to decompress full blocks if we want to get any of the data.
226	* This buffer is to store the spill after decompressing a block. */
227	uint8_t abSpill[RTZIPLZF_MAX_UNCOMPRESSED_DATA_SIZE];
228	/** The number of bytes left spill buffer. */
229	unsigned cbSpill;
230	/** The current spill buffer position. */
231	uint8_t *pbSpill;
232	} LZF;
233	#endif
234
235	} u;
236	} RTZIPDECOM;
237
238
239
240	#ifdef RTZIP_USE_STORE
241
242	/**
243	* @copydoc RTZipCompress
244	*/
245	static DECLCALLBACK(int) rtZipStoreCompress(PRTZIPCOMP pZip, const void *pvBuf, size_t cbBuf)
246	{
247	while (cbBuf)
248	{
249	/*
250	* Flush.
251	*/
252	size_t cb = (uintptr_t)&pZip->abBuffer[sizeof(pZip->abBuffer)] - (uintptr_t)pZip->u.Store.pb;
253	if (cb <= 0)
254	{
255	int rc = pZip->pfnOut(pZip->pvUser, &pZip->abBuffer[0], sizeof(pZip->abBuffer));
256	if (RT_FAILURE(rc))
257	return rc;
258	cb = sizeof(pZip->abBuffer);
259	pZip->u.Store.pb = &pZip->abBuffer[0];
260	}
261
262	/*
263	* Add to the buffer and advance.
264	*/
265	if (cbBuf < cb)
266	cb = cbBuf;
267	memcpy(pZip->u.Store.pb, pvBuf, cb);
268	pZip->u.Store.pb += cb;
269	cbBuf -= cb;
270	pvBuf = (uint8_t *)pvBuf + cb;
271	}
272	return VINF_SUCCESS;
273	}
274
275
276	/**
277	* @copydoc RTZipCompFinish
278	*/
279	static DECLCALLBACK(int) rtZipStoreCompFinish(PRTZIPCOMP pZip)
280	{
281	size_t cb = (uintptr_t)pZip->u.Store.pb - (uintptr_t)&pZip->abBuffer[0];
282	if (cb > 0)
283	{
284	int rc = pZip->pfnOut(pZip->pvUser, &pZip->abBuffer[0], cb);
285	if (RT_FAILURE(rc))
286	return rc;
287	}
288	return VINF_SUCCESS;
289	}
290
291
292	/**
293	* @copydoc RTZipCompDestroy
294	*/
295	static DECLCALLBACK(int) rtZipStoreCompDestroy(PRTZIPCOMP pZip)
296	{
297	return VINF_SUCCESS;
298	}
299
300
301	/**
302	* Initializes the compressor instance.
303	* @returns iprt status code.
304	* @param pZip The compressor instance.
305	* @param enmLevel The desired compression level.
306	*/
307	static DECLCALLBACK(int) rtZipStoreCompInit(PRTZIPCOMP pZip, RTZIPLEVEL enmLevel)
308	{
309	pZip->pfnCompress = rtZipStoreCompress;
310	pZip->pfnFinish = rtZipStoreCompFinish;
311	pZip->pfnDestroy = rtZipStoreCompDestroy;
312
313	pZip->u.Store.pb = &pZip->abBuffer[1];
314	return VINF_SUCCESS;
315	}
316
317
318	/**
319	* @copydoc RTZipDecompress
320	*/
321	static DECLCALLBACK(int) rtZipStoreDecompress(PRTZIPDECOMP pZip, void pvBuf, size_t cbBuf, size_t pcbWritten)
322	{
323	size_t cbWritten = 0;
324	while (cbBuf)
325	{
326	/*
327	* Fill buffer.
328	*/
329	size_t cb = pZip->u.Store.cbBuffer;
330	if (cb <= 0)
331	{
332	int rc = pZip->pfnIn(pZip->pvUser, &pZip->abBuffer[0], sizeof(pZip->abBuffer), &cb);
333	if (RT_FAILURE(rc))
334	return rc;
335	pZip->u.Store.cbBuffer = cb;
336	pZip->u.Store.pb = &pZip->abBuffer[0];
337	}
338
339	/*
340	* No more data?
341	*/
342	if (cb == 0)
343	{
344	if (pcbWritten)
345	{
346	*pcbWritten = cbWritten;
347	return VINF_SUCCESS;
348	}
349	return VERR_NO_DATA;
350	}
351
352	/*
353	* Add to the buffer and advance.
354	*/
355	if (cbBuf < cb)
356	cb = cbBuf;
357	memcpy(pvBuf, pZip->u.Store.pb, cb);
358	pZip->u.Store.pb += cb;
359	pZip->u.Store.cbBuffer -= cb;
360	cbBuf -= cb;
361	pvBuf = (char *)pvBuf + cb;
362	cbWritten += cb;
363	}
364	if (pcbWritten)
365	*pcbWritten = cbWritten;
366	return VINF_SUCCESS;
367	}
368
369
370	/**
371	* @copydoc RTZipDecompDestroy
372	*/
373	static DECLCALLBACK(int) rtZipStoreDecompDestroy(PRTZIPDECOMP pZip)
374	{
375	return VINF_SUCCESS;
376	}
377
378
379	/**
380	* Initialize the decompressor instance.
381	* @returns iprt status code.
382	* @param pZip The decompressor instance.
383	*/
384	static DECLCALLBACK(int) rtZipStoreDecompInit(PRTZIPDECOMP pZip)
385	{
386	pZip->pfnDecompress = rtZipStoreDecompress;
387	pZip->pfnDestroy = rtZipStoreDecompDestroy;
388
389	pZip->u.Store.pb = &pZip->abBuffer[0];
390	pZip->u.Store.cbBuffer = 0;
391	return VINF_SUCCESS;
392	}
393
394	#endif
395
396
397	#ifdef RTZIP_USE_ZLIB
398	/**
399	* Convert from zlib errno to iprt status code.
400	* @returns iprt status code.
401	* @param rc Zlib error code.
402	*/
403	static int zipErrConvertFromZlib(int rc)
404	{
405	/** @todo proper zlib error convertion. */
406	switch (rc)
407	{
408	case Z_ERRNO:
409	return RTErrConvertFromErrno(errno);
410	case Z_STREAM_ERROR:
411	case Z_DATA_ERROR:
412	case Z_MEM_ERROR:
413	case Z_BUF_ERROR:
414	case Z_VERSION_ERROR:
415	return VERR_GENERAL_FAILURE;
416	default:
417	if (rc >= 0)
418	return VINF_SUCCESS;
419	return VERR_GENERAL_FAILURE;
420	}
421	}
422
423
424	/**
425	* @copydoc RTZipCompress
426	*/
427	static DECLCALLBACK(int) rtZipZlibCompress(PRTZIPCOMP pZip, const void *pvBuf, size_t cbBuf)
428	{
429	pZip->u.Zlib.next_in = (Bytef *)pvBuf;
430	pZip->u.Zlib.avail_in = cbBuf;
431	while (pZip->u.Zlib.avail_in > 0)
432	{
433	/*
434	* Flush output buffer?
435	*/
436	if (pZip->u.Zlib.avail_out <= 0)
437	{
438	int rc = pZip->pfnOut(pZip->pvUser, &pZip->abBuffer[0], sizeof(pZip->abBuffer) - pZip->u.Zlib.avail_out);
439	if (RT_FAILURE(rc))
440	return rc;
441	pZip->u.Zlib.avail_out = sizeof(pZip->abBuffer);
442	pZip->u.Zlib.next_out = &pZip->abBuffer[0];
443	}
444
445	/*
446	* Pass it on to zlib.
447	*/
448	int rc = deflate(&pZip->u.Zlib, Z_NO_FLUSH);
449	if (rc != Z_OK)
450	return zipErrConvertFromZlib(rc);
451	}
452	return VINF_SUCCESS;
453	}
454
455
456	/**
457	* @copydoc RTZipCompFinish
458	*/
459	static DECLCALLBACK(int) rtZipZlibCompFinish(PRTZIPCOMP pZip)
460	{
461	int rc = Z_OK;
462	for (;;)
463	{
464	/*
465	* Flush outstanding stuff. writes.
466	*/
467	if (rc == Z_STREAM_END \|\| pZip->u.Zlib.avail_out <= 0)
468	{
469	int rc2 = pZip->pfnOut(pZip->pvUser, &pZip->abBuffer[0], sizeof(pZip->abBuffer) - pZip->u.Zlib.avail_out);
470	if (RT_FAILURE(rc2))
471	return rc2;
472	pZip->u.Zlib.avail_out = sizeof(pZip->abBuffer);
473	pZip->u.Zlib.next_out = &pZip->abBuffer[0];
474	if (rc == Z_STREAM_END)
475	return VINF_SUCCESS;
476	}
477
478	/*
479	* Tell zlib to flush.
480	*/
481	rc = deflate(&pZip->u.Zlib, Z_FINISH);
482	if (rc != Z_OK && rc != Z_STREAM_END)
483	return zipErrConvertFromZlib(rc);
484	}
485	return VINF_SUCCESS;
486	}
487
488
489	/**
490	* @copydoc RTZipCompDestroy
491	*/
492	static DECLCALLBACK(int) rtZipZlibCompDestroy(PRTZIPCOMP pZip)
493	{
494	/*
495	* Terminate the deflate instance.
496	*/
497	int rc = deflateEnd(&pZip->u.Zlib);
498	if (rc != Z_OK)
499	rc = zipErrConvertFromZlib(rc);
500	return rc;
501	}
502
503
504	/**
505	* Initializes the compressor instance.
506	* @returns iprt status code.
507	* @param pZip The compressor instance.
508	* @param enmLevel The desired compression level.
509	*/
510	static DECLCALLBACK(int) rtZipZlibCompInit(PRTZIPCOMP pZip, RTZIPLEVEL enmLevel)
511	{
512	pZip->pfnCompress = rtZipZlibCompress;
513	pZip->pfnFinish = rtZipZlibCompFinish;
514	pZip->pfnDestroy = rtZipZlibCompDestroy;
515
516	int iLevel = Z_DEFAULT_COMPRESSION;
517	switch (enmLevel)
518	{
519	case RTZIPLEVEL_STORE: iLevel = 0; break;
520	case RTZIPLEVEL_FAST: iLevel = 2; break;
521	case RTZIPLEVEL_DEFAULT: iLevel = Z_DEFAULT_COMPRESSION; break;
522	case RTZIPLEVEL_MAX: iLevel = 9; break;
523	}
524
525	memset(&pZip->u.Zlib, 0, sizeof(pZip->u.Zlib));
526	pZip->u.Zlib.next_out = &pZip->abBuffer[1];
527	pZip->u.Zlib.avail_out = sizeof(pZip->abBuffer) - 1;
528	pZip->u.Zlib.opaque = pZip;
529
530	int rc = deflateInit(&pZip->u.Zlib, enmLevel);
531	return rc >= 0 ? rc = VINF_SUCCESS : zipErrConvertFromZlib(rc);
532	}
533
534
535	/**
536	* @copydoc RTZipDecompress
537	*/
538	static DECLCALLBACK(int) rtZipZlibDecompress(PRTZIPDECOMP pZip, void pvBuf, size_t cbBuf, size_t pcbWritten)
539	{
540	pZip->u.Zlib.next_out = (Bytef *)pvBuf;
541	pZip->u.Zlib.avail_out = cbBuf;
542	int rc = Z_OK;
543	while (pZip->u.Zlib.avail_out > 0)
544	{
545	/*
546	* Read more input?
547	*/
548	if (pZip->u.Zlib.avail_in <= 0)
549	{
550	size_t cb = sizeof(pZip->abBuffer);
551	int rc = pZip->pfnIn(pZip->pvUser, &pZip->abBuffer[0], sizeof(pZip->abBuffer), &cb);
552	if (RT_FAILURE(rc))
553	return rc;
554	pZip->u.Zlib.avail_in = cb;
555	pZip->u.Zlib.next_in = &pZip->abBuffer[0];
556	}
557
558	/*
559	* Pass it on to zlib.
560	*/
561	rc = inflate(&pZip->u.Zlib, Z_NO_FLUSH);
562	if (rc == Z_STREAM_END)
563	{
564	if (pcbWritten)
565	*pcbWritten = cbBuf - pZip->u.Zlib.avail_out;
566	else if (pZip->u.Zlib.avail_out > 0)
567	return VERR_NO_DATA;
568	break;
569	}
570	if (rc != Z_OK)
571	return zipErrConvertFromZlib(rc);
572	}
573	return VINF_SUCCESS;
574	}
575
576
577	/**
578	* @copydoc RTZipDecompDestroy
579	*/
580	static DECLCALLBACK(int) rtZipZlibDecompDestroy(PRTZIPDECOMP pZip)
581	{
582	/*
583	* Terminate the deflate instance.
584	*/
585	int rc = inflateEnd(&pZip->u.Zlib);
586	if (rc != Z_OK)
587	rc = zipErrConvertFromZlib(rc);
588	return rc;
589	}
590
591
592	/**
593	* Initialize the decompressor instance.
594	* @returns iprt status code.
595	* @param pZip The decompressor instance.
596	*/
597	static DECLCALLBACK(int) rtZipZlibDecompInit(PRTZIPDECOMP pZip)
598	{
599	pZip->pfnDecompress = rtZipZlibDecompress;
600	pZip->pfnDestroy = rtZipZlibDecompDestroy;
601
602	memset(&pZip->u.Zlib, 0, sizeof(pZip->u.Zlib));
603	pZip->u.Zlib.opaque = pZip;
604
605	int rc = inflateInit(&pZip->u.Zlib);
606	return rc >= 0 ? VINF_SUCCESS : zipErrConvertFromZlib(rc);
607	}
608
609	#endif
610
611
612	#ifdef RTZIP_USE_BZLIB
613	/**
614	* Convert from BZlib errno to iprt status code.
615	* @returns iprt status code.
616	* @param rc BZlib error code.
617	*/
618	static int zipErrConvertFromBZlib(int rc)
619	{
620	/** @todo proper bzlib error convertion. */
621	switch (rc)
622	{
623	case BZ_SEQUENCE_ERROR:
624	AssertMsgFailed(("BZ_SEQUENCE_ERROR shall not happen!\n"));
625	return VERR_GENERAL_FAILURE;
626	case BZ_PARAM_ERROR:
627	return VERR_INVALID_PARAMETER;
628	case BZ_MEM_ERROR:
629	return VERR_NO_MEMORY;
630	case BZ_DATA_ERROR:
631	case BZ_DATA_ERROR_MAGIC:
632	case BZ_IO_ERROR:
633	case BZ_UNEXPECTED_EOF:
634	case BZ_CONFIG_ERROR:
635	return VERR_GENERAL_FAILURE;
636	case BZ_OUTBUFF_FULL:
637	AssertMsgFailed(("BZ_OUTBUFF_FULL shall not happen!\n"));
638	return VERR_GENERAL_FAILURE;
639	default:
640	if (rc >= 0)
641	return VINF_SUCCESS;
642	return VERR_GENERAL_FAILURE;
643	}
644	}
645
646
647	/**
648	* @copydoc RTZipCompress
649	*/
650	static DECLCALLBACK(int) rtZipBZlibCompress(PRTZIPCOMP pZip, const void *pvBuf, size_t cbBuf)
651	{
652	pZip->u.BZlib.next_in = (char *)pvBuf;
653	pZip->u.BZlib.avail_in = cbBuf;
654	while (pZip->u.BZlib.avail_in > 0)
655	{
656	/*
657	* Flush output buffer?
658	*/
659	if (pZip->u.BZlib.avail_out <= 0)
660	{
661	int rc = pZip->pfnOut(pZip->pvUser, &pZip->abBuffer[0], sizeof(pZip->abBuffer) - pZip->u.BZlib.avail_out);
662	if (RT_FAILURE(rc))
663	return rc;
664	pZip->u.BZlib.avail_out = sizeof(pZip->abBuffer);
665	pZip->u.BZlib.next_out = (char *)&pZip->abBuffer[0];
666	}
667
668	/*
669	* Pass it on to zlib.
670	*/
671	int rc = BZ2_bzCompress(&pZip->u.BZlib, BZ_RUN);
672	if (rc < 0 && rc != BZ_OUTBUFF_FULL)
673	return zipErrConvertFromBZlib(rc);
674	}
675	return VINF_SUCCESS;
676	}
677
678
679	/**
680	* @copydoc RTZipCompFinish
681	*/
682	static DECLCALLBACK(int) rtZipBZlibCompFinish(PRTZIPCOMP pZip)
683	{
684	int rc = BZ_FINISH_OK;
685	for (;;)
686	{
687	/*
688	* Flush output buffer?
689	*/
690	if (rc == BZ_STREAM_END \|\| pZip->u.BZlib.avail_out <= 0)
691	{
692	int rc2 = pZip->pfnOut(pZip->pvUser, &pZip->abBuffer[0], sizeof(pZip->abBuffer) - pZip->u.BZlib.avail_out);
693	if (RT_FAILURE(rc2))
694	return rc2;
695	pZip->u.BZlib.avail_out = sizeof(pZip->abBuffer);
696	pZip->u.BZlib.next_out = (char *)&pZip->abBuffer[0];
697	if (rc == BZ_STREAM_END)
698	return VINF_SUCCESS;
699	}
700
701	/*
702	* Tell BZlib to finish it.
703	*/
704	rc = BZ2_bzCompress(&pZip->u.BZlib, BZ_FINISH);
705	if (rc < 0 && rc != BZ_OUTBUFF_FULL)
706	return zipErrConvertFromBZlib(rc);
707	}
708	return VINF_SUCCESS;
709	}
710
711
712	/**
713	* @copydoc RTZipCompDestroy
714	*/
715	static DECLCALLBACK(int) rtZipBZlibCompDestroy(PRTZIPCOMP pZip)
716	{
717	/*
718	* Terminate the deflate instance.
719	*/
720	int rc = BZ2_bzCompressEnd(&pZip->u.BZlib);
721	if (rc != BZ_OK)
722	rc = zipErrConvertFromBZlib(rc);
723	return rc;
724	}
725
726
727	/**
728	* Initializes the compressor instance.
729	* @returns iprt status code.
730	* @param pZip The compressor instance.
731	* @param enmLevel The desired compression level.
732	*/
733	static DECLCALLBACK(int) rtZipBZlibCompInit(PRTZIPCOMP pZip, RTZIPLEVEL enmLevel)
734	{
735	pZip->pfnCompress = rtZipBZlibCompress;
736	pZip->pfnFinish = rtZipBZlibCompFinish;
737	pZip->pfnDestroy = rtZipBZlibCompDestroy;
738
739	int iSize = 6;
740	int iWork = 0;
741	switch (enmLevel)
742	{
743	case RTZIPLEVEL_STORE: iSize = 1; iWork = 2; break;
744	case RTZIPLEVEL_FAST: iSize = 2; iWork = 0; break;
745	case RTZIPLEVEL_DEFAULT: iSize = 5; iWork = 0; break;
746	case RTZIPLEVEL_MAX: iSize = 9; iWork = 0; break;
747	}
748
749	memset(&pZip->u.BZlib, 0, sizeof(pZip->u.BZlib));
750	pZip->u.BZlib.next_out = (char *)&pZip->abBuffer[1];
751	pZip->u.BZlib.avail_out = sizeof(pZip->abBuffer) - 1;
752	pZip->u.BZlib.opaque = pZip;
753
754	int rc = BZ2_bzCompressInit(&pZip->u.BZlib, iSize, 0, iWork);
755	return rc >= 0 ? VINF_SUCCESS : zipErrConvertFromBZlib(rc);;
756	}
757
758
759	/**
760	* @copydoc RTZipDecompress
761	*/
762	static DECLCALLBACK(int) rtZipBZlibDecompress(PRTZIPDECOMP pZip, void pvBuf, size_t cbBuf, size_t pcbWritten)
763	{
764	pZip->u.BZlib.next_out = (char *)pvBuf;
765	pZip->u.BZlib.avail_out = cbBuf;
766	while (pZip->u.BZlib.avail_out > 0)
767	{
768	/*
769	* Read more output buffer?
770	*/
771	if (pZip->u.BZlib.avail_in <= 0)
772	{
773	size_t cb;
774	int rc = pZip->pfnIn(pZip->pvUser, &pZip->abBuffer[0], sizeof(pZip->abBuffer), &cb);
775	if (RT_FAILURE(rc))
776	return rc;
777	pZip->u.BZlib.avail_in = cb;
778	pZip->u.BZlib.next_in = (char *)&pZip->abBuffer[0];
779	}
780
781	/*
782	* Pass it on to zlib.
783	*/
784	int rc = BZ2_bzDecompress(&pZip->u.BZlib);
785	if (rc == BZ_STREAM_END \|\| rc == BZ_OUTBUFF_FULL)
786	{
787	if (pcbWritten)
788	*pcbWritten = cbBuf - pZip->u.BZlib.avail_out;
789	else if (pZip->u.BZlib.avail_out > 0)
790	return VERR_NO_DATA;
791	break;
792	}
793	if (rc < 0)
794	return zipErrConvertFromBZlib(rc);
795	}
796	return VINF_SUCCESS;
797	}
798
799
800	/**
801	* @copydoc RTZipDecompDestroy
802	*/
803	static DECLCALLBACK(int) rtZipBZlibDecompDestroy(PRTZIPDECOMP pZip)
804	{
805	/*
806	* Terminate the deflate instance.
807	*/
808	int rc = BZ2_bzDecompressEnd(&pZip->u.BZlib);
809	if (rc != BZ_OK)
810	rc = zipErrConvertFromBZlib(rc);
811	return rc;
812	}
813
814
815	/**
816	* Initialize the decompressor instance.
817	* @returns iprt status code.
818	* @param pZip The decompressor instance.
819	*/
820	static DECLCALLBACK(int) rtZipBZlibDecompInit(PRTZIPDECOMP pZip)
821	{
822	pZip->pfnDecompress = rtZipBZlibDecompress;
823	pZip->pfnDestroy = rtZipBZlibDecompDestroy;
824
825	memset(&pZip->u.BZlib, 0, sizeof(pZip->u.BZlib));
826	pZip->u.BZlib.opaque = pZip;
827
828	int rc = BZ2_bzDecompressInit(&pZip->u.BZlib, 0, 0);
829	return rc >= 0 ? VINF_SUCCESS : zipErrConvertFromBZlib(rc);
830	}
831
832	#endif
833
834
835	#ifdef RTZIP_USE_LZF
836
837	/**
838	* Flushes the output buffer.
839	* @returns iprt status code.
840	* @param pZip The compressor instance.
841	*/
842	static int rtZipLZFCompFlushOutput(PRTZIPCOMP pZip)
843	{
844	size_t cb = pZip->u.LZF.pbOutput - &pZip->abBuffer[0];
845	pZip->u.LZF.pbOutput = &pZip->abBuffer[0];
846	return pZip->pfnOut(pZip->pvUser, &pZip->abBuffer[0], cb);
847	}
848
849
850	/**
851	* Compresses a buffer using LZF.
852	*
853	* @returns VBox status code.
854	* @param pZip The compressor instance.
855	* @param pbBuf What to compress.
856	* @param cbBuf How much to compress.
857	*/
858	static int rtZipLZFCompressBuffer(PRTZIPCOMP pZip, const uint8_t *pbBuf, size_t cbBuf)
859	{
860	bool fForceFlush = false;
861	while (cbBuf > 0)
862	{
863	/*
864	* Flush output buffer?
865	*/
866	unsigned cbFree = sizeof(pZip->abBuffer) - (pZip->u.LZF.pbOutput - &pZip->abBuffer[0]);
867	if ( fForceFlush
868	\|\| cbFree < RTZIPLZF_MAX_DATA_SIZE + sizeof(RTZIPLZFHDR))
869	{
870	int rc = rtZipLZFCompFlushOutput(pZip);
871	if (RT_FAILURE(rc))
872	return rc;
873	fForceFlush = false;
874	cbFree = sizeof(pZip->abBuffer);
875	}
876
877	/*
878	* Setup the block header.
879	*/
880	PRTZIPLZFHDR pHdr = (PRTZIPLZFHDR)pZip->u.LZF.pbOutput; /* warning: This might be unaligned! */
881	pHdr->u16Magic = RTZIPLZFHDR_MAGIC;
882	pHdr->cbData = 0;
883	pHdr->u32CRC = 0;
884	pHdr->cbUncompressed = 0;
885	cbFree -= sizeof(*pHdr);
886	pZip->u.LZF.pbOutput += sizeof(*pHdr);
887
888	/*
889	* Compress data for the block.
890	*
891	* We try compress as much as we have freespace for at first,
892	* but if it turns out the compression is inefficient, we'll
893	* reduce the size of data we try compress till it fits the
894	* output space.
895	*/
896	cbFree = RT_MIN(cbFree, RTZIPLZF_MAX_DATA_SIZE);
897	unsigned cbInput = RT_MIN(RTZIPLZF_MAX_UNCOMPRESSED_DATA_SIZE, cbBuf);
898	unsigned cbOutput = lzf_compress(pbBuf, cbInput, pZip->u.LZF.pbOutput, cbFree);
899	if (!cbOutput)
900	{
901	/** @todo add an alternative method which stores the raw data if bad compression. */
902	do
903	{
904	cbInput /= 2;
905	if (!cbInput)
906	{
907	AssertMsgFailed(("lzf_compress bug! cbFree=%zu\n", cbFree));
908	return VERR_INTERNAL_ERROR;
909	}
910	cbOutput = lzf_compress(pbBuf, cbInput, pZip->u.LZF.pbOutput, cbFree);
911	} while (!cbOutput);
912	fForceFlush = true;
913	}
914
915	/*
916	* Upate the header and advance the input buffer.
917	*/
918	pHdr->cbData = cbOutput;
919	//pHdr->u32CRC = RTCrc32(pbBuf, cbInput); - too slow
920	pHdr->cbUncompressed = cbInput;
921
922	pZip->u.LZF.pbOutput += cbOutput;
923	cbBuf -= cbInput;
924	pbBuf += cbInput;
925	}
926	return VINF_SUCCESS;
927	}
928
929
930	/**
931	* Flushes the input buffer.
932	* @returns iprt status code.
933	* @param pZip The compressor instance.
934	*/
935	static int rtZipLZFCompFlushInput(PRTZIPCOMP pZip)
936	{
937	size_t cb = pZip->u.LZF.pbInput - &pZip->u.LZF.abInput[0];
938	pZip->u.LZF.pbInput = &pZip->u.LZF.abInput[0];
939	pZip->u.LZF.cbInputFree = sizeof(pZip->u.LZF.abInput);
940	if (cb)
941	return rtZipLZFCompressBuffer(pZip, pZip->u.LZF.abInput, cb);
942	return VINF_SUCCESS;
943	}
944
945
946	/**
947	* @copydoc RTZipCompress
948	*/
949	static DECLCALLBACK(int) rtZipLZFCompress(PRTZIPCOMP pZip, const void *pvBuf, size_t cbBuf)
950	{
951	#define RTZIPLZF_SMALL_CHUNK (128)
952
953	/*
954	* Flush the input buffer if necessary.
955	*/
956	if ( ( cbBuf <= RTZIPLZF_SMALL_CHUNK
957	&& cbBuf > pZip->u.LZF.cbInputFree)
958	\|\| ( cbBuf > RTZIPLZF_SMALL_CHUNK
959	&& pZip->u.LZF.cbInputFree != sizeof(pZip->u.LZF.abInput))
960	)
961	{
962	int rc = rtZipLZFCompFlushInput(pZip);
963	if (RT_FAILURE(rc))
964	return rc;
965	}
966
967	/*
968	* If it's a relativly small block put it in the input buffer, elsewise
969	* compress directly it.
970	*/
971	if (cbBuf <= RTZIPLZF_SMALL_CHUNK)
972	{
973	Assert(pZip->u.LZF.cbInputFree >= cbBuf);
974	memcpy(pZip->u.LZF.pbInput, pvBuf, cbBuf);
975	pZip->u.LZF.pbInput += cbBuf;
976	pZip->u.LZF.cbInputFree -= cbBuf;
977	}
978	else
979	{
980	Assert(pZip->u.LZF.cbInputFree == sizeof(pZip->u.LZF.abInput));
981	int rc = rtZipLZFCompressBuffer(pZip, (const uint8_t *)pvBuf, cbBuf);
982	if (RT_FAILURE(rc))
983	return rc;
984	}
985	return VINF_SUCCESS;
986	}
987
988
989	/**
990	* @copydoc RTZipCompFinish
991	*/
992	static DECLCALLBACK(int) rtZipLZFCompFinish(PRTZIPCOMP pZip)
993	{
994	int rc = rtZipLZFCompFlushInput(pZip);
995	if (RT_SUCCESS(rc))
996	rc = rtZipLZFCompFlushOutput(pZip);
997	return rc;
998	}
999
1000
1001	/**
1002	* @copydoc RTZipCompDestroy
1003	*/
1004	static DECLCALLBACK(int) rtZipLZFCompDestroy(PRTZIPCOMP pZip)
1005	{
1006	return VINF_SUCCESS;
1007	}
1008
1009
1010	/**
1011	* Initializes the compressor instance.
1012	* @returns iprt status code.
1013	* @param pZip The compressor instance.
1014	* @param enmLevel The desired compression level.
1015	*/
1016	static DECLCALLBACK(int) rtZipLZFCompInit(PRTZIPCOMP pZip, RTZIPLEVEL enmLevel)
1017	{
1018	pZip->pfnCompress = rtZipLZFCompress;
1019	pZip->pfnFinish = rtZipLZFCompFinish;
1020	pZip->pfnDestroy = rtZipLZFCompDestroy;
1021
1022	pZip->u.LZF.pbOutput = &pZip->abBuffer[1];
1023	pZip->u.LZF.pbInput = &pZip->u.LZF.abInput[0];
1024	pZip->u.LZF.cbInputFree = sizeof(pZip->u.LZF.abInput);
1025	return VINF_SUCCESS;
1026	}
1027
1028
1029	/**
1030	* This will validate a header and to all the necessary bitching if it's invalid.
1031	* @returns true if valid.
1032	* @returns false if invalid.
1033	* @param pHdr Pointer to the header.\
1034	*/
1035	static bool rtZipLZFValidHeader(PCRTZIPLZFHDR pHdr)
1036	{
1037	if ( pHdr->u16Magic != RTZIPLZFHDR_MAGIC
1038	\|\| !pHdr->cbData
1039	\|\| pHdr->cbData > RTZIPLZF_MAX_DATA_SIZE
1040	\|\| !pHdr->cbUncompressed
1041	\|\| pHdr->cbUncompressed > RTZIPLZF_MAX_UNCOMPRESSED_DATA_SIZE
1042	)
1043	{
1044	AssertMsgFailed(("Invalid LZF header! %.*%Rhxs\n", sizeof(pHdr), pHdr));
1045	return false;
1046	}
1047	return true;
1048	}
1049
1050
1051	/**
1052	* @copydoc RTZipDecompress
1053	*/
1054	static DECLCALLBACK(int) rtZipLZFDecompress(PRTZIPDECOMP pZip, void pvBuf, size_t cbBuf, size_t pcbWritten)
1055	{
1056	/*
1057	* Decompression loop.
1058	*
1059	* This a bit ugly because we have to deal with reading block...
1060	* To simplify matters we've put a max block size and will never
1061	* fill the input buffer with more than allows us to complete
1062	* any partially read blocks.
1063	*
1064	* When possible we decompress directly to the user buffer, when
1065	* not possible we'll use the spill buffer.
1066	*/
1067	while (cbBuf > 0)
1068	{
1069	/*
1070	* Anything in the spill buffer?
1071	*/
1072	if (pZip->u.LZF.cbSpill > 0)
1073	{
1074	size_t cb = RT_MIN(pZip->u.LZF.cbSpill, cbBuf);
1075	memcpy(pvBuf, pZip->u.LZF.pbSpill, cb);
1076	pZip->u.LZF.pbSpill += cb;
1077	pZip->u.LZF.cbSpill -= cb;
1078	cbBuf -= cb;
1079	if (pcbWritten)
1080	*pcbWritten = cb;
1081	if (!cbBuf)
1082	break;
1083	pvBuf = (uint8_t *)pvBuf + cb;
1084	}
1085
1086	/*
1087	* Incomplete header or nothing at all.
1088	*/
1089	PCRTZIPLZFHDR pHdr;
1090	if (pZip->u.LZF.cbInput < sizeof(RTZIPLZFHDR))
1091	{
1092	if (pZip->u.LZF.cbInput <= 0)
1093	{
1094	/* empty, fill the buffer. */
1095	size_t cb = 0;
1096	int rc = pZip->pfnIn(pZip->pvUser, &pZip->abBuffer[0],
1097	sizeof(pZip->abBuffer) - RTZIPLZF_MAX_DATA_SIZE, &cb);
1098	if (RT_FAILURE(rc))
1099	return rc;
1100	pZip->u.LZF.pbInput = &pZip->abBuffer[0];
1101	pZip->u.LZF.cbInput = cb;
1102	pHdr = (PCRTZIPLZFHDR)pZip->u.LZF.pbInput;
1103	}
1104	else
1105	{
1106	/* move the header up and fill the buffer. */
1107	size_t cbCur = pZip->u.LZF.cbInput;
1108	memmove(&pZip->abBuffer[0], pZip->u.LZF.pbInput, cbCur);
1109	pZip->u.LZF.pbInput = &pZip->abBuffer[0];
1110
1111	size_t cb = 0;
1112	int rc = pZip->pfnIn(pZip->pvUser, &pZip->abBuffer[cbCur],
1113	sizeof(pZip->abBuffer) - RTZIPLZF_MAX_DATA_SIZE - cbCur, &cb);
1114	if (RT_FAILURE(rc))
1115	return rc;
1116	pHdr = (PCRTZIPLZFHDR)pZip->u.LZF.pbInput;
1117	pZip->u.LZF.cbInput += cb;
1118	}
1119
1120	/*
1121	* Validate the header.
1122	*/
1123	if (!rtZipLZFValidHeader(pHdr))
1124	return VERR_GENERAL_FAILURE; /** @todo Get better error codes for RTZip! */
1125	}
1126	else
1127	{
1128	/*
1129	* Validate the header and check if it's an incomplete block.
1130	*/
1131	pHdr = (PCRTZIPLZFHDR)pZip->u.LZF.pbInput;
1132	if (!rtZipLZFValidHeader(pHdr))
1133	return VERR_GENERAL_FAILURE; /** @todo Get better error codes for RTZip! */
1134
1135	if (pHdr->cbData > pZip->u.LZF.cbInput - sizeof(*pHdr))
1136	{
1137	/* read the remainder of the block. */
1138	size_t cbToRead = pHdr->cbData - (pZip->u.LZF.cbInput - sizeof(*pHdr));
1139	Assert(&pZip->u.LZF.pbInput[pZip->u.LZF.cbInput + cbToRead] <= &pZip->u.LZF.pbInput[sizeof(pZip->abBuffer)]);
1140	int rc = pZip->pfnIn(pZip->pvUser, &pZip->u.LZF.pbInput[pZip->u.LZF.cbInput],
1141	cbToRead, NULL);
1142	if (RT_FAILURE(rc))
1143	return rc;
1144	pZip->u.LZF.cbInput += cbToRead;
1145	}
1146	}
1147	AssertMsgReturn(sizeof(*pHdr) + pHdr->cbData <= pZip->u.LZF.cbInput,
1148	("cbData=%#x cbInput=%#x\n", pHdr->cbData, pZip->u.LZF.cbInput),
1149	VERR_GENERAL_FAILURE); /** @todo Get better error codes for RTZip! */
1150
1151	/*
1152	* Does the uncompressed data fit into the supplied buffer?
1153	* If so we uncompress it directly into the user buffer, else we'll have to use the spill buffer.
1154	*/
1155	unsigned cbUncompressed = pHdr->cbUncompressed;
1156	if (cbUncompressed <= cbBuf)
1157	{
1158	unsigned cbOutput = lzf_decompress(pHdr + 1, pHdr->cbData, pvBuf, cbUncompressed);
1159	if (cbOutput != cbUncompressed)
1160	{
1161	AssertMsgFailed(("Decompression error, errno=%d. cbOutput=%#x cbUncompressed=%#x\n",
1162	errno, cbOutput, cbUncompressed));
1163	return VERR_GENERAL_FAILURE; /** @todo Get better error codes for RTZip! */
1164	}
1165	cbBuf -= cbUncompressed;
1166	pvBuf = (uint8_t *)pvBuf + cbUncompressed;
1167	}
1168	else
1169	{
1170	unsigned cbOutput = lzf_decompress(pHdr + 1, pHdr->cbData, pZip->u.LZF.abSpill, cbUncompressed);
1171	if (cbOutput != cbUncompressed)
1172	{
1173	AssertMsgFailed(("Decompression error, errno=%d. cbOutput=%#x cbUncompressed=%#x\n",
1174	errno, cbOutput, cbUncompressed));
1175	return VERR_GENERAL_FAILURE; /** @todo Get better error codes for RTZip! */
1176	}
1177	pZip->u.LZF.pbSpill = &pZip->u.LZF.abSpill[0];
1178	pZip->u.LZF.cbSpill = cbUncompressed;
1179	}
1180
1181	/* advance the input buffer */
1182	pZip->u.LZF.cbInput -= pHdr->cbData + sizeof(*pHdr);
1183	pZip->u.LZF.pbInput += pHdr->cbData + sizeof(*pHdr);
1184	if (pcbWritten)
1185	*pcbWritten += cbUncompressed;
1186	}
1187
1188	return VINF_SUCCESS;
1189	}
1190
1191
1192	/**
1193	* @copydoc RTZipDecompDestroy
1194	*/
1195	static DECLCALLBACK(int) rtZipLZFDecompDestroy(PRTZIPDECOMP pZip)
1196	{
1197	return VINF_SUCCESS;
1198	}
1199
1200
1201	/**
1202	* Initalize the decompressor instance.
1203	* @returns iprt status code.
1204	* @param pZip The decompressor instance.
1205	*/
1206	static DECLCALLBACK(int) rtZipLZFDecompInit(PRTZIPDECOMP pZip)
1207	{
1208	pZip->pfnDecompress = rtZipLZFDecompress;
1209	pZip->pfnDestroy = rtZipLZFDecompDestroy;
1210
1211	pZip->u.LZF.pbInput = NULL;
1212	pZip->u.LZF.cbInput = 0;
1213	pZip->u.LZF.cbSpill = 0;
1214	pZip->u.LZF.pbSpill = NULL;
1215
1216	return VINF_SUCCESS;
1217	}
1218
1219	#endif /* RTZIP_USE_LZF */
1220
1221
1222	/**
1223	* Create a compressor instance.
1224	*
1225	* @returns iprt status code.
1226	* @param ppZip Where to store the instance handle.
1227	* @param pvUser User argument which will be passed on to pfnOut and pfnIn.
1228	* @param pfnOut Callback for consuming output of compression.
1229	* @param enmType Type of compressor to create.
1230	* @param enmLevel Compression level.
1231	*/
1232	RTDECL(int) RTZipCompCreate(PRTZIPCOMP ppZip, void pvUser, PFNRTZIPOUT pfnOut, RTZIPTYPE enmType, RTZIPLEVEL enmLevel)
1233	{
1234	/*
1235	* Validate input.
1236	*/
1237	if ( enmType < RTZIPTYPE_AUTO
1238	\|\| enmType > RTZIPTYPE_LZF)
1239	{
1240	AssertMsgFailed(("Invalid enmType=%d\n", enmType));
1241	return VERR_INVALID_PARAMETER;
1242	}
1243	if ( enmLevel < RTZIPLEVEL_STORE
1244	\|\| enmLevel > RTZIPLEVEL_MAX)
1245	{
1246	AssertMsgFailed(("Invalid enmLevel=%d\n", enmLevel));
1247	return VERR_INVALID_PARAMETER;
1248	}
1249	if (!pfnOut \|\| !ppZip)
1250	{
1251	AssertMsgFailed(("Must supply pfnOut and ppZip!\n"));
1252	return VERR_INVALID_PARAMETER;
1253	}
1254
1255	/*
1256	* Allocate memory for the instance data.
1257	*/
1258	PRTZIPCOMP pZip = (PRTZIPCOMP)RTMemAlloc(sizeof(RTZIPCOMP));
1259	if (!pZip)
1260	return VERR_NO_MEMORY;
1261
1262	/*
1263	* Determin auto type.
1264	*/
1265	if (enmType == RTZIPTYPE_AUTO)
1266	{
1267	if (enmLevel == RTZIPLEVEL_STORE)
1268	enmType = RTZIPTYPE_STORE;
1269	else
1270	{
1271	#if defined(RTZIP_USE_ZLIB) && defined(RTZIP_USE_BZLIB)
1272	if (enmLevel == RTZIPLEVEL_MAX)
1273	enmType = RTZIPTYPE_BZLIB;
1274	else
1275	enmType = RTZIPTYPE_ZLIB;
1276	#elif defined(RTZIP_USE_ZLIB)
1277	enmType = RTZIPTYPE_ZLIB;
1278	#elif defined(RTZIP_USE_BZLIB)
1279	enmType = RTZIPTYPE_BZLIB;
1280	#else
1281	enmType = RTZIPTYPE_STORE;
1282	#endif
1283	}
1284	}
1285
1286	/*
1287	* Init instance.
1288	*/
1289	pZip->pfnOut = pfnOut;
1290	pZip->enmType = enmType;
1291	pZip->pvUser = pvUser;
1292	pZip->abBuffer[0] = enmType; /* first byte is the compression type. */
1293	int rc = VINF_SUCCESS;
1294	switch (enmType)
1295	{
1296	#ifdef RTZIP_USE_STORE
1297	case RTZIPTYPE_STORE:
1298	rc = rtZipStoreCompInit(pZip, enmLevel);
1299	break;
1300	#endif
1301
1302	#ifdef RTZIP_USE_ZLIB
1303	case RTZIPTYPE_ZLIB:
1304	rc = rtZipZlibCompInit(pZip, enmLevel);
1305	break;
1306	#endif
1307
1308	#ifdef RTZIP_USE_BZLIB
1309	case RTZIPTYPE_BZLIB:
1310	rc = rtZipBZlibCompInit(pZip, enmLevel);
1311	break;
1312	#endif
1313
1314	#ifdef RTZIP_USE_LZF
1315	case RTZIPTYPE_LZF:
1316	rc = rtZipLZFCompInit(pZip, enmLevel);
1317	break;
1318	#endif
1319
1320	default:
1321	AssertMsgFailed(("Not implemented!\n"));
1322	rc = VERR_NOT_IMPLEMENTED;
1323	break;
1324	}
1325
1326	if (RT_SUCCESS(rc))
1327	*ppZip = pZip;
1328	else
1329	RTMemFree(pZip);
1330	return rc;
1331	}
1332
1333
1334	/**
1335	* Compresses a chunk of memory.
1336	*
1337	* @returns iprt status code.
1338	* @param pZip The compressor instance.
1339	* @param pvBuf Pointer to buffer containing the bits to compress.
1340	* @param cbBuf Number of bytes to compress.
1341	*/
1342	RTDECL(int) RTZipCompress(PRTZIPCOMP pZip, const void *pvBuf, size_t cbBuf)
1343	{
1344	if (!cbBuf)
1345	return VINF_SUCCESS;
1346	return pZip->pfnCompress(pZip, pvBuf, cbBuf);
1347	}
1348
1349
1350	/**
1351	* Finishes the compression.
1352	* This will flush all data and terminate the compression data stream.
1353	*
1354	* @returns iprt status code.
1355	* @param pZip The compressor instance.
1356	*/
1357	RTDECL(int) RTZipCompFinish(PRTZIPCOMP pZip)
1358	{
1359	return pZip->pfnFinish(pZip);
1360	}
1361
1362
1363	/**
1364	* Destroys the compressor instance.
1365	*
1366	* @returns iprt status code.
1367	* @param pZip The compressor instance.
1368	*/
1369	RTDECL(int) RTZipCompDestroy(PRTZIPCOMP pZip)
1370	{
1371	/*
1372	* Compressor specific destruction attempt first.
1373	*/
1374	int rc = pZip->pfnDestroy(pZip);
1375	AssertRCReturn(rc, rc);
1376
1377	/*
1378	* Free the instance memory.
1379	*/
1380	pZip->enmType = RTZIPTYPE_INVALID;
1381	RTMemFree(pZip);
1382	return VINF_SUCCESS;
1383	}
1384
1385
1386	/**
1387	* @copydoc RTZipDecompress
1388	*/
1389	static DECLCALLBACK(int) rtZipStubDecompress(PRTZIPDECOMP pZip, void pvBuf, size_t cbBuf, size_t pcbWritten)
1390	{
1391	return VERR_NOT_SUPPORTED;
1392	}
1393
1394
1395	/**
1396	* @copydoc RTZipDecompDestroy
1397	*/
1398	static DECLCALLBACK(int) rtZipStubDecompDestroy(PRTZIPDECOMP pZip)
1399	{
1400	return VINF_SUCCESS;
1401	}
1402
1403
1404	/**
1405	* Create a decompressor instance.
1406	*
1407	* @returns iprt status code.
1408	* @param ppZip Where to store the instance handle.
1409	* @param pvUser User argument which will be passed on to pfnOut and pfnIn.
1410	* @param pfnIn Callback for producing input for decompression.
1411	*/
1412	RTDECL(int) RTZipDecompCreate(PRTZIPDECOMP ppZip, void pvUser, PFNRTZIPIN pfnIn)
1413	{
1414	/*
1415	* Validate input.
1416	*/
1417	if (!pfnIn \|\| !ppZip)
1418	{
1419	AssertMsgFailed(("Must supply pfnIn and ppZip!\n"));
1420	return VERR_INVALID_PARAMETER;
1421	}
1422
1423	/*
1424	* Allocate memory for the instance data.
1425	*/
1426	PRTZIPDECOMP pZip = (PRTZIPDECOMP)RTMemAlloc(sizeof(RTZIPDECOMP));
1427	if (!pZip)
1428	return VERR_NO_MEMORY;
1429
1430	/*
1431	* Init instance.
1432	*/
1433	pZip->pfnIn = pfnIn;
1434	pZip->enmType = RTZIPTYPE_INVALID;
1435	pZip->pvUser = pvUser;
1436	pZip->pfnDecompress = NULL;
1437	pZip->pfnDestroy = rtZipStubDecompDestroy;
1438
1439	*ppZip = pZip;
1440	return VINF_SUCCESS;
1441	}
1442
1443
1444	/**
1445	* Lazy init of the decompressor.
1446	* @returns iprt status code.
1447	* @param pZip The decompressor instance.
1448	*/
1449	static int rtzipDecompInit(PRTZIPDECOMP pZip)
1450	{
1451	/*
1452	* Read the first byte from the stream so we can determin the type.
1453	*/
1454	uint8_t u8Type;
1455	int rc = pZip->pfnIn(pZip->pvUser, &u8Type, sizeof(u8Type), NULL);
1456	if (RT_FAILURE(rc))
1457	return rc;
1458
1459	/*
1460	* Determin type and do type specific init.
1461	*/
1462	pZip->enmType = (RTZIPTYPE)u8Type;
1463	switch (pZip->enmType)
1464	{
1465	#ifdef RTZIP_USE_STORE
1466	case RTZIPTYPE_STORE:
1467	rc = rtZipStoreDecompInit(pZip);
1468	break;
1469	#endif
1470
1471	case RTZIPTYPE_ZLIB:
1472	#ifdef RTZIP_USE_ZLIB
1473	rc = rtZipZlibDecompInit(pZip);
1474	#else
1475	AssertMsgFailedReturn(("Zlib is not include in this build!\n"), VERR_NOT_IMPLEMENTED);
1476	#endif
1477	break;
1478
1479	case RTZIPTYPE_BZLIB:
1480	#ifdef RTZIP_USE_BZLIB
1481	rc = rtZipBZlibDecompInit(pZip);
1482	#else
1483	AssertMsgFailedReturn(("BZlib is not include in this build!\n"), VERR_NOT_IMPLEMENTED);
1484	#endif
1485	break;
1486
1487	case RTZIPTYPE_LZF:
1488	#ifdef RTZIP_USE_LZF
1489	rc = rtZipLZFDecompInit(pZip);
1490	#else
1491	AssertMsgFailedReturn(("LZF is not include in this build!\n"), VERR_NOT_IMPLEMENTED);
1492	#endif
1493	break;
1494
1495	case RTZIPTYPE_INVALID:
1496	AssertMsgFailed(("Invalid compression type RTZIPTYPE_INVALID!\n"));
1497	rc = VERR_NOT_IMPLEMENTED;
1498	break;
1499
1500	case RTZIPTYPE_AUTO:
1501	AssertMsgFailed(("Invalid compression type RTZIPTYPE_AUTO!\n"));
1502	rc = VERR_INVALID_MAGIC;
1503	break;
1504
1505	default:
1506	AssertMsgFailed(("Unknown compression type %d\n\n", pZip->enmType));
1507	rc = VERR_INVALID_MAGIC;
1508	break;
1509	}
1510	if (RT_FAILURE(rc))
1511	{
1512	pZip->pfnDecompress = rtZipStubDecompress;
1513	pZip->pfnDestroy = rtZipStubDecompDestroy;
1514	}
1515
1516	return rc;
1517	}
1518
1519	/**
1520	* Decompresses a chunk of memory.
1521	*
1522	* @returns iprt status code.
1523	* @param pZip The decompressor instance.
1524	* @param pvBuf Where to store the decompressed data.
1525	* @param cbBuf Number of bytes to produce. If pcbWritten is set
1526	* any number of bytes up to cbBuf might be returned.
1527	* @param pcbWritten Number of bytes actually written to the buffer. If NULL
1528	* cbBuf number of bytes must be written.
1529	*/
1530	RTDECL(int) RTZipDecompress(PRTZIPDECOMP pZip, void pvBuf, size_t cbBuf, size_t pcbWritten)
1531	{
1532	/*
1533	* Skip empty requests.
1534	*/
1535	if (!cbBuf)
1536	return VINF_SUCCESS;
1537
1538	/*
1539	* Lazy init.
1540	*/
1541	if (!pZip->pfnDecompress)
1542	{
1543	int rc = rtzipDecompInit(pZip);
1544	if (RT_FAILURE(rc))
1545	return rc;
1546	}
1547
1548	/*
1549	* 'Read' the decompressed stream.
1550	*/
1551	return pZip->pfnDecompress(pZip, pvBuf, cbBuf, pcbWritten);
1552	}
1553
1554	/**
1555	* Destroys the decompressor instance.
1556	*
1557	* @returns iprt status code.
1558	* @param pZip The decompressor instance.
1559	*/
1560	RTDECL(int) RTZipDecompDestroy(PRTZIPDECOMP pZip)
1561	{
1562	/*
1563	* Destroy compressor instance and flush the output buffer.
1564	*/
1565	int rc = pZip->pfnDestroy(pZip);
1566	AssertRCReturn(rc, rc);
1567
1568	/*
1569	* Free the instance memory.
1570	*/
1571	pZip->enmType = RTZIPTYPE_INVALID;
1572	RTMemFree(pZip);
1573	return rc;
1574	}
1575
1576

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source: vbox/trunk/src/VBox/Runtime/zip.cpp@ 939

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