gzipvfs.cpp@ 81106

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1	/* $Id: gzipvfs.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT - GZIP Compressor and Decompressor I/O Stream.
4	*/
5
6	/*
7	* Copyright (C) 2010-2019 Oracle Corporation
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 (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Defined Constants And Macros *
30	*********************************************************************************************************************************/
31	#include "internal/iprt.h"
32	#include <iprt/zip.h>
33
34	#include <iprt/assert.h>
35	#include <iprt/ctype.h>
36	#include <iprt/file.h>
37	#include <iprt/err.h>
38	#include <iprt/poll.h>
39	#include <iprt/string.h>
40	#include <iprt/vfslowlevel.h>
41
42	#include <zlib.h>
43
44	#if defined(RT_OS_OS2) \|\| defined(RT_OS_SOLARIS) \|\| defined(RT_OS_WINDOWS)
45	/**
46	* Drag in the missing zlib symbols.
47	*/
48	PFNRT g_apfnRTZlibDeps[] =
49	{
50	(PFNRT)gzrewind,
51	(PFNRT)gzread,
52	(PFNRT)gzopen,
53	(PFNRT)gzwrite,
54	(PFNRT)gzclose,
55	(PFNRT)gzdopen,
56	NULL
57	};
58	#endif /* RT_OS_OS2 \|\| RT_OS_SOLARIS \|\| RT_OS_WINDOWS */
59
60
61	/*********************************************************************************************************************************
62	* Structures and Typedefs *
63	*********************************************************************************************************************************/
64	#pragma pack(1)
65	typedef struct RTZIPGZIPHDR
66	{
67	/** RTZIPGZIPHDR_ID1. */
68	uint8_t bId1;
69	/** RTZIPGZIPHDR_ID2. */
70	uint8_t bId2;
71	/** CM - The compression method. */
72	uint8_t bCompressionMethod;
73	/** FLG - Flags. */
74	uint8_t fFlags;
75	/** Modification time of the source file or the timestamp at the time the
76	* compression took place. Can also be zero. Is the number of seconds since
77	* unix epoch. */
78	uint32_t u32ModTime;
79	/** Flags specific to the compression method. */
80	uint8_t bXtraFlags;
81	/** An ID indicating which OS or FS gzip ran on. */
82	uint8_t bOS;
83	} RTZIPGZIPHDR;
84	#pragma pack()
85	AssertCompileSize(RTZIPGZIPHDR, 10);
86	/** Pointer to a const gzip header. */
87	typedef RTZIPGZIPHDR const *PCRTZIPGZIPHDR;
88
89	/** gzip header identification no 1. */
90	#define RTZIPGZIPHDR_ID1 0x1f
91	/** gzip header identification no 2. */
92	#define RTZIPGZIPHDR_ID2 0x8b
93	/** gzip deflate compression method. */
94	#define RTZIPGZIPHDR_CM_DEFLATE 8
95
96	/** @name gzip header flags
97	* @{ */
98	/** Probably a text file */
99	#define RTZIPGZIPHDR_FLG_TEXT UINT8_C(0x01)
100	/** Header CRC present (crc32 of header cast to uint16_t). */
101	#define RTZIPGZIPHDR_FLG_HDR_CRC UINT8_C(0x02)
102	/** Length prefixed xtra field is present. */
103	#define RTZIPGZIPHDR_FLG_EXTRA UINT8_C(0x04)
104	/** A name field is present (latin-1). */
105	#define RTZIPGZIPHDR_FLG_NAME UINT8_C(0x08)
106	/** A comment field is present (latin-1). */
107	#define RTZIPGZIPHDR_FLG_COMMENT UINT8_C(0x10)
108	/** Mask of valid flags. */
109	#define RTZIPGZIPHDR_FLG_VALID_MASK UINT8_C(0x1f)
110	/** @} */
111
112	/** @name gzip default xtra flag values
113	* @{ */
114	#define RTZIPGZIPHDR_XFL_DEFLATE_MAX UINT8_C(0x02)
115	#define RTZIPGZIPHDR_XFL_DEFLATE_FASTEST UINT8_C(0x04)
116	/** @} */
117
118	/** @name Operating system / Filesystem IDs
119	* @{ */
120	#define RTZIPGZIPHDR_OS_FAT UINT8_C(0x00)
121	#define RTZIPGZIPHDR_OS_AMIGA UINT8_C(0x01)
122	#define RTZIPGZIPHDR_OS_VMS UINT8_C(0x02)
123	#define RTZIPGZIPHDR_OS_UNIX UINT8_C(0x03)
124	#define RTZIPGZIPHDR_OS_VM_CMS UINT8_C(0x04)
125	#define RTZIPGZIPHDR_OS_ATARIS_TOS UINT8_C(0x05)
126	#define RTZIPGZIPHDR_OS_HPFS UINT8_C(0x06)
127	#define RTZIPGZIPHDR_OS_MACINTOSH UINT8_C(0x07)
128	#define RTZIPGZIPHDR_OS_Z_SYSTEM UINT8_C(0x08)
129	#define RTZIPGZIPHDR_OS_CPM UINT8_C(0x09)
130	#define RTZIPGZIPHDR_OS_TOPS_20 UINT8_C(0x0a)
131	#define RTZIPGZIPHDR_OS_NTFS UINT8_C(0x0b)
132	#define RTZIPGZIPHDR_OS_QDOS UINT8_C(0x0c)
133	#define RTZIPGZIPHDR_OS_ACORN_RISCOS UINT8_C(0x0d)
134	#define RTZIPGZIPHDR_OS_UNKNOWN UINT8_C(0xff)
135	/** @} */
136
137
138	/**
139	* The internal data of a GZIP I/O stream.
140	*/
141	typedef struct RTZIPGZIPSTREAM
142	{
143	/** The stream we're reading or writing the compressed data from or to. */
144	RTVFSIOSTREAM hVfsIos;
145	/** Set if it's a decompressor, clear if it's a compressor. */
146	bool fDecompress;
147	/** Set if zlib reported a fatal error. */
148	bool fFatalError;
149	/** Set if we've reached the end of the zlib stream. */
150	bool fEndOfStream;
151	/** The stream offset for pfnTell, always the uncompressed data. */
152	RTFOFF offStream;
153	/** The zlib stream. */
154	z_stream Zlib;
155	/** The data buffer. */
156	uint8_t abBuffer[_64K];
157	/** Scatter gather segment describing abBuffer. */
158	RTSGSEG SgSeg;
159	/** Scatter gather buffer describing abBuffer. */
160	RTSGBUF SgBuf;
161	/** The original file name (decompressor only). */
162	char *pszOrgName;
163	/** The comment (decompressor only). */
164	char *pszComment;
165	/** The gzip header. */
166	RTZIPGZIPHDR Hdr;
167	} RTZIPGZIPSTREAM;
168	/** Pointer to a the internal data of a GZIP I/O stream. */
169	typedef RTZIPGZIPSTREAM *PRTZIPGZIPSTREAM;
170
171
172	/*********************************************************************************************************************************
173	* Internal Functions *
174	*********************************************************************************************************************************/
175	static int rtZipGzip_FlushIt(PRTZIPGZIPSTREAM pThis, uint8_t fFlushType);
176
177
178	/**
179	* Convert from zlib to IPRT status codes.
180	*
181	* This will also set the fFatalError flag when appropriate.
182	*
183	* @returns IPRT status code.
184	* @param pThis The gzip I/O stream instance data.
185	* @param rc Zlib error code.
186	*/
187	static int rtZipGzipConvertErrFromZlib(PRTZIPGZIPSTREAM pThis, int rc)
188	{
189	switch (rc)
190	{
191	case Z_OK:
192	return VINF_SUCCESS;
193
194	case Z_BUF_ERROR:
195	/* This isn't fatal. */
196	return VINF_SUCCESS; /** @todo The code in zip.cpp treats Z_BUF_ERROR as fatal... */
197
198	case Z_STREAM_ERROR:
199	pThis->fFatalError = true;
200	return VERR_ZIP_CORRUPTED;
201
202	case Z_DATA_ERROR:
203	pThis->fFatalError = true;
204	return pThis->fDecompress ? VERR_ZIP_CORRUPTED : VERR_ZIP_ERROR;
205
206	case Z_MEM_ERROR:
207	pThis->fFatalError = true;
208	return VERR_ZIP_NO_MEMORY;
209
210	case Z_VERSION_ERROR:
211	pThis->fFatalError = true;
212	return VERR_ZIP_UNSUPPORTED_VERSION;
213
214	case Z_ERRNO: /* We shouldn't see this status! */
215	default:
216	AssertMsgFailed(("%d\n", rc));
217	if (rc >= 0)
218	return VINF_SUCCESS;
219	pThis->fFatalError = true;
220	return VERR_ZIP_ERROR;
221	}
222	}
223
224
225	/**
226	* @interface_method_impl{RTVFSOBJOPS,pfnClose}
227	*/
228	static DECLCALLBACK(int) rtZipGzip_Close(void *pvThis)
229	{
230	PRTZIPGZIPSTREAM pThis = (PRTZIPGZIPSTREAM)pvThis;
231
232	int rc;
233	if (pThis->fDecompress)
234	{
235	rc = inflateEnd(&pThis->Zlib);
236	if (rc != Z_OK)
237	rc = rtZipGzipConvertErrFromZlib(pThis, rc);
238	}
239	else
240	{
241	/* Flush the compression stream before terminating it. */
242	rc = VINF_SUCCESS;
243	if (!pThis->fFatalError)
244	rc = rtZipGzip_FlushIt(pThis, Z_FINISH);
245
246	int rc2 = deflateEnd(&pThis->Zlib);
247	if (RT_SUCCESS(rc) && rc2 != Z_OK)
248	rc = rtZipGzipConvertErrFromZlib(pThis, rc);
249	}
250
251	RTVfsIoStrmRelease(pThis->hVfsIos);
252	pThis->hVfsIos = NIL_RTVFSIOSTREAM;
253	RTStrFree(pThis->pszOrgName);
254	pThis->pszOrgName = NULL;
255	RTStrFree(pThis->pszComment);
256	pThis->pszComment = NULL;
257
258	return rc;
259	}
260
261
262	/**
263	* @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo}
264	*/
265	static DECLCALLBACK(int) rtZipGzip_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
266	{
267	PRTZIPGZIPSTREAM pThis = (PRTZIPGZIPSTREAM)pvThis;
268	return RTVfsIoStrmQueryInfo(pThis->hVfsIos, pObjInfo, enmAddAttr);
269	}
270
271
272	/**
273	* Reads one segment.
274	*
275	* @returns IPRT status code.
276	* @param pThis The gzip I/O stream instance data.
277	* @param pvBuf Where to put the read bytes.
278	* @param cbToRead The number of bytes to read.
279	* @param fBlocking Whether to block or not.
280	* @param pcbRead Where to store the number of bytes actually read.
281	*/
282	static int rtZipGzip_ReadOneSeg(PRTZIPGZIPSTREAM pThis, void pvBuf, size_t cbToRead, bool fBlocking, size_t pcbRead)
283	{
284	/*
285	* This simplifies life a wee bit below.
286	*/
287	if (pThis->fEndOfStream)
288	return pcbRead ? VINF_EOF : VERR_EOF;
289
290	/*
291	* Set up the output buffer.
292	*/
293	pThis->Zlib.next_out = (Bytef *)pvBuf;
294	pThis->Zlib.avail_out = (uInt)cbToRead;
295	AssertReturn(pThis->Zlib.avail_out == cbToRead, VERR_OUT_OF_RANGE);
296
297	/*
298	* Be greedy reading input, even if no output buffer is left. It's possible
299	* that it's just the end of stream marker which needs to be read. Happens
300	* for incompressible blocks just larger than the input buffer size.
301	*/
302	int rc = VINF_SUCCESS;
303	while ( pThis->Zlib.avail_out > 0
304	\|\| pThis->Zlib.avail_in == 0 /* greedy */)
305	{
306	/*
307	* Read more input?
308	*
309	* N.B. The assertions here validate the RTVfsIoStrmSgRead behavior
310	* since the API is new and untested. They could be removed later
311	* but, better leaving them in.
312	*/
313	if (pThis->Zlib.avail_in == 0)
314	{
315	size_t cbReadIn = ~(size_t)0;
316	rc = RTVfsIoStrmSgRead(pThis->hVfsIos, -1 /off/, &pThis->SgBuf, fBlocking, &cbReadIn);
317	if (rc != VINF_SUCCESS)
318	{
319	AssertMsg(RT_FAILURE(rc) \|\| rc == VINF_TRY_AGAIN \|\| rc == VINF_EOF, ("%Rrc\n", rc));
320	if (rc == VERR_INTERRUPTED)
321	{
322	Assert(cbReadIn == 0);
323	continue;
324	}
325	if (RT_FAILURE(rc) \|\| rc == VINF_TRY_AGAIN \|\| cbReadIn == 0)
326	{
327	Assert(cbReadIn == 0);
328	break;
329	}
330	AssertMsg(rc == VINF_EOF, ("%Rrc\n", rc));
331	}
332	AssertMsgBreakStmt(cbReadIn > 0 && cbReadIn <= sizeof(pThis->abBuffer), ("%zu %Rrc\n", cbReadIn, rc),
333	rc = VERR_INTERNAL_ERROR_4);
334
335	pThis->Zlib.avail_in = (uInt)cbReadIn;
336	pThis->Zlib.next_in = &pThis->abBuffer[0];
337	}
338
339	/*
340	* Pass it on to zlib.
341	*/
342	rc = inflate(&pThis->Zlib, Z_NO_FLUSH);
343	if (rc != Z_OK && rc != Z_BUF_ERROR)
344	{
345	if (rc == Z_STREAM_END)
346	{
347	pThis->fEndOfStream = true;
348	if (pThis->Zlib.avail_out == 0)
349	rc = VINF_SUCCESS;
350	else
351	rc = pcbRead ? VINF_EOF : VERR_EOF;
352	}
353	else
354	rc = rtZipGzipConvertErrFromZlib(pThis, rc);
355	break;
356	}
357	rc = VINF_SUCCESS;
358	}
359
360	/*
361	* Update the read counters before returning.
362	*/
363	size_t const cbRead = cbToRead - pThis->Zlib.avail_out;
364	pThis->offStream += cbRead;
365	if (pcbRead)
366	*pcbRead = cbRead;
367
368	return rc;
369	}
370
371
372	/**
373	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnRead}
374	*/
375	static DECLCALLBACK(int) rtZipGzip_Read(void pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t pcbRead)
376	{
377	PRTZIPGZIPSTREAM pThis = (PRTZIPGZIPSTREAM)pvThis;
378
379	Assert(pSgBuf->cSegs == 1);
380	if (!pThis->fDecompress)
381	return VERR_ACCESS_DENIED;
382	AssertReturn(off == -1 \|\| off == pThis->offStream , VERR_INVALID_PARAMETER);
383
384	return rtZipGzip_ReadOneSeg(pThis, pSgBuf->paSegs[0].pvSeg, pSgBuf->paSegs[0].cbSeg, fBlocking, pcbRead);
385	}
386
387
388	/**
389	* Internal helper for rtZipGzip_Write, rtZipGzip_Flush and rtZipGzip_Close.
390	*
391	* @returns IPRT status code.
392	* @retval VINF_SUCCESS
393	* @retval VINF_TRY_AGAIN - the only informational status.
394	* @retval VERR_INTERRUPTED - call again.
395	*
396	* @param pThis The gzip I/O stream instance data.
397	* @param fBlocking Whether to block or not.
398	*/
399	static int rtZipGzip_WriteOutputBuffer(PRTZIPGZIPSTREAM pThis, bool fBlocking)
400	{
401	/*
402	* Anything to write? No, then just return immediately.
403	*/
404	size_t cbToWrite = sizeof(pThis->abBuffer) - pThis->Zlib.avail_out;
405	if (cbToWrite == 0)
406	{
407	Assert(pThis->Zlib.next_out == &pThis->abBuffer[0]);
408	return VINF_SUCCESS;
409	}
410	Assert(cbToWrite <= sizeof(pThis->abBuffer));
411
412	/*
413	* Loop write on VERR_INTERRUPTED.
414	*
415	* Note! Asserting a bit extra here to make sure the
416	* RTVfsIoStrmSgWrite works correctly.
417	*/
418	int rc;
419	size_t cbWrittenOut;
420	for (;;)
421	{
422	/* Set up the buffer. */
423	pThis->SgSeg.cbSeg = cbToWrite;
424	Assert(pThis->SgSeg.pvSeg == &pThis->abBuffer[0]);
425	RTSgBufReset(&pThis->SgBuf);
426
427	cbWrittenOut = ~(size_t)0;
428	rc = RTVfsIoStrmSgWrite(pThis->hVfsIos, -1 /off/, &pThis->SgBuf, fBlocking, &cbWrittenOut);
429	if (rc != VINF_SUCCESS)
430	{
431	AssertMsg(RT_FAILURE(rc) \|\| rc == VINF_TRY_AGAIN, ("%Rrc\n", rc));
432	if (rc == VERR_INTERRUPTED)
433	{
434	Assert(cbWrittenOut == 0);
435	continue;
436	}
437	if (RT_FAILURE(rc) \|\| rc == VINF_TRY_AGAIN \|\| cbWrittenOut == 0)
438	{
439	AssertReturn(cbWrittenOut == 0, VERR_INTERNAL_ERROR_3);
440	AssertReturn(rc != VINF_SUCCESS, VERR_IPE_UNEXPECTED_INFO_STATUS);
441	return rc;
442	}
443	}
444	break;
445	}
446	AssertMsgReturn(cbWrittenOut > 0 && cbWrittenOut <= sizeof(pThis->abBuffer),
447	("%zu %Rrc\n", cbWrittenOut, rc),
448	VERR_INTERNAL_ERROR_4);
449
450	/*
451	* Adjust the Zlib output buffer members.
452	*/
453	if (cbWrittenOut == pThis->SgBuf.paSegs[0].cbSeg)
454	{
455	pThis->Zlib.avail_out = sizeof(pThis->abBuffer);
456	pThis->Zlib.next_out = &pThis->abBuffer[0];
457	}
458	else
459	{
460	Assert(cbWrittenOut <= pThis->SgBuf.paSegs[0].cbSeg);
461	size_t cbLeft = pThis->SgBuf.paSegs[0].cbSeg - cbWrittenOut;
462	memmove(&pThis->abBuffer[0], &pThis->abBuffer[cbWrittenOut], cbLeft);
463	pThis->Zlib.avail_out += (uInt)cbWrittenOut;
464	pThis->Zlib.next_out = &pThis->abBuffer[cbWrittenOut];
465	}
466
467	return VINF_SUCCESS;
468	}
469
470
471	/**
472	* Processes all available input.
473	*
474	* @returns IPRT status code.
475	*
476	* @param pThis The gzip I/O stream instance data.
477	* @param fBlocking Whether to block or not.
478	*/
479	static int rtZipGzip_CompressIt(PRTZIPGZIPSTREAM pThis, bool fBlocking)
480	{
481	/*
482	* Processes all the intput currently lined up for us.
483	*/
484	while (pThis->Zlib.avail_in > 0)
485	{
486	/* Make sure there is some space in the output buffer before calling
487	deflate() so we don't waste time filling up the corners. */
488	static const size_t s_cbFlushThreshold = 4096;
489	AssertCompile(sizeof(pThis->abBuffer) >= s_cbFlushThreshold * 4);
490	if (pThis->Zlib.avail_out < s_cbFlushThreshold)
491	{
492	int rc = rtZipGzip_WriteOutputBuffer(pThis, fBlocking);
493	if (rc != VINF_SUCCESS)
494	return rc;
495	Assert(pThis->Zlib.avail_out >= s_cbFlushThreshold);
496	}
497
498	int rcZlib = deflate(&pThis->Zlib, Z_NO_FLUSH);
499	if (rcZlib != Z_OK)
500	return rtZipGzipConvertErrFromZlib(pThis, rcZlib);
501	}
502	return VINF_SUCCESS;
503	}
504
505
506	/**
507	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnWrite}
508	*/
509	static DECLCALLBACK(int) rtZipGzip_Write(void pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t pcbWritten)
510	{
511	PRTZIPGZIPSTREAM pThis = (PRTZIPGZIPSTREAM)pvThis;
512
513	Assert(pSgBuf->cSegs == 1); NOREF(fBlocking);
514	if (pThis->fDecompress)
515	return VERR_ACCESS_DENIED;
516	AssertReturn(off == -1 \|\| off == pThis->offStream , VERR_INVALID_PARAMETER);
517
518	/*
519	* Write out the input buffer. Using a loop here because of potential
520	* integer type overflow since avail_in is uInt and cbSeg is size_t.
521	*/
522	int rc = VINF_SUCCESS;
523	size_t cbWritten = 0;
524	uint8_t const pbSrc = (uint8_t const )pSgBuf->paSegs[0].pvSeg;
525	size_t cbLeft = pSgBuf->paSegs[0].cbSeg;
526	if (cbLeft > 0)
527	for (;;)
528	{
529	size_t cbThis = cbLeft < ~(uInt)0 ? cbLeft : ~(uInt)0 / 2;
530	pThis->Zlib.next_in = (Bytef * )pbSrc;
531	pThis->Zlib.avail_in = (uInt)cbThis;
532	rc = rtZipGzip_CompressIt(pThis, fBlocking);
533
534	Assert(cbThis >= pThis->Zlib.avail_in);
535	cbThis -= pThis->Zlib.avail_in;
536	cbWritten += cbThis;
537	if (cbLeft == cbThis \|\| rc != VINF_SUCCESS)
538	break;
539	pbSrc += cbThis;
540	cbLeft -= cbThis;
541	}
542
543	pThis->offStream += cbWritten;
544	if (pcbWritten)
545	*pcbWritten = cbWritten;
546	return rc;
547	}
548
549
550	/**
551	* Processes all available input.
552	*
553	* @returns IPRT status code.
554	*
555	* @param pThis The gzip I/O stream instance data.
556	* @param fFlushType The flush type to pass to deflate().
557	*/
558	static int rtZipGzip_FlushIt(PRTZIPGZIPSTREAM pThis, uint8_t fFlushType)
559	{
560	/*
561	* Tell Zlib to flush until it stops producing more output.
562	*/
563	int rc;
564	bool fMaybeMore = true;
565	for (;;)
566	{
567	/* Write the entire output buffer. */
568	do
569	{
570	rc = rtZipGzip_WriteOutputBuffer(pThis, true /fBlocking/);
571	if (RT_FAILURE(rc))
572	return rc;
573	Assert(rc == VINF_SUCCESS);
574	} while (pThis->Zlib.avail_out < sizeof(pThis->abBuffer));
575
576	if (!fMaybeMore)
577	return VINF_SUCCESS;
578
579	/* Do the flushing. */
580	pThis->Zlib.next_in = NULL;
581	pThis->Zlib.avail_in = 0;
582	int rcZlib = deflate(&pThis->Zlib, fFlushType);
583	if (rcZlib == Z_OK)
584	fMaybeMore = pThis->Zlib.avail_out < 64 \|\| fFlushType == Z_FINISH;
585	else if (rcZlib == Z_STREAM_END)
586	fMaybeMore = false;
587	else
588	{
589	rtZipGzip_WriteOutputBuffer(pThis, true /fBlocking/);
590	return rtZipGzipConvertErrFromZlib(pThis, rcZlib);
591	}
592	}
593	}
594
595
596	/**
597	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnFlush}
598	*/
599	static DECLCALLBACK(int) rtZipGzip_Flush(void *pvThis)
600	{
601	PRTZIPGZIPSTREAM pThis = (PRTZIPGZIPSTREAM)pvThis;
602	if (!pThis->fDecompress)
603	{
604	int rc = rtZipGzip_FlushIt(pThis, Z_SYNC_FLUSH);
605	if (RT_FAILURE(rc))
606	return rc;
607	}
608
609	return RTVfsIoStrmFlush(pThis->hVfsIos);
610	}
611
612
613	/**
614	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnPollOne}
615	*/
616	static DECLCALLBACK(int) rtZipGzip_PollOne(void *pvThis, uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr,
617	uint32_t *pfRetEvents)
618	{
619	PRTZIPGZIPSTREAM pThis = (PRTZIPGZIPSTREAM)pvThis;
620
621	/*
622	* Collect our own events first and see if that satisfies the request. If
623	* not forward the call to the compressed stream.
624	*/
625	uint32_t fRetEvents = 0;
626	if (pThis->fFatalError)
627	fRetEvents \|= RTPOLL_EVT_ERROR;
628	if (pThis->fDecompress)
629	{
630	fEvents &= ~RTPOLL_EVT_WRITE;
631	if (pThis->Zlib.avail_in > 0)
632	fRetEvents = RTPOLL_EVT_READ;
633	}
634	else
635	{
636	fEvents &= ~RTPOLL_EVT_READ;
637	if (pThis->Zlib.avail_out > 0)
638	fRetEvents = RTPOLL_EVT_WRITE;
639	}
640
641	int rc = VINF_SUCCESS;
642	fRetEvents &= fEvents;
643	if (!fRetEvents)
644	rc = RTVfsIoStrmPoll(pThis->hVfsIos, fEvents, cMillies, fIntr, pfRetEvents);
645	return rc;
646	}
647
648
649	/**
650	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnTell}
651	*/
652	static DECLCALLBACK(int) rtZipGzip_Tell(void *pvThis, PRTFOFF poffActual)
653	{
654	PRTZIPGZIPSTREAM pThis = (PRTZIPGZIPSTREAM)pvThis;
655	*poffActual = pThis->offStream;
656	return VINF_SUCCESS;
657	}
658
659
660	/**
661	* The GZIP I/O stream vtable.
662	*/
663	static RTVFSIOSTREAMOPS g_rtZipGzipOps =
664	{
665	{ /* Obj */
666	RTVFSOBJOPS_VERSION,
667	RTVFSOBJTYPE_IO_STREAM,
668	"gzip",
669	rtZipGzip_Close,
670	rtZipGzip_QueryInfo,
671	RTVFSOBJOPS_VERSION
672	},
673	RTVFSIOSTREAMOPS_VERSION,
674	RTVFSIOSTREAMOPS_FEAT_NO_SG,
675	rtZipGzip_Read,
676	rtZipGzip_Write,
677	rtZipGzip_Flush,
678	rtZipGzip_PollOne,
679	rtZipGzip_Tell,
680	NULL /* Skip */,
681	NULL /ZeroFill/,
682	RTVFSIOSTREAMOPS_VERSION,
683	};
684
685
686	RTDECL(int) RTZipGzipDecompressIoStream(RTVFSIOSTREAM hVfsIosIn, uint32_t fFlags, PRTVFSIOSTREAM phVfsIosOut)
687	{
688	AssertPtrReturn(hVfsIosIn, VERR_INVALID_HANDLE);
689	AssertReturn(!(fFlags & ~RTZIPGZIPDECOMP_F_ALLOW_ZLIB_HDR), VERR_INVALID_PARAMETER);
690	AssertPtrReturn(phVfsIosOut, VERR_INVALID_POINTER);
691
692	uint32_t cRefs = RTVfsIoStrmRetain(hVfsIosIn);
693	AssertReturn(cRefs != UINT32_MAX, VERR_INVALID_HANDLE);
694
695	/*
696	* Create the decompression I/O stream.
697	*/
698	RTVFSIOSTREAM hVfsIos;
699	PRTZIPGZIPSTREAM pThis;
700	int rc = RTVfsNewIoStream(&g_rtZipGzipOps, sizeof(RTZIPGZIPSTREAM), RTFILE_O_READ, NIL_RTVFS, NIL_RTVFSLOCK,
701	&hVfsIos, (void **)&pThis);
702	if (RT_SUCCESS(rc))
703	{
704	pThis->hVfsIos = hVfsIosIn;
705	pThis->offStream = 0;
706	pThis->fDecompress = true;
707	pThis->SgSeg.pvSeg = &pThis->abBuffer[0];
708	pThis->SgSeg.cbSeg = sizeof(pThis->abBuffer);
709	RTSgBufInit(&pThis->SgBuf, &pThis->SgSeg, 1);
710
711	memset(&pThis->Zlib, 0, sizeof(pThis->Zlib));
712	pThis->Zlib.opaque = pThis;
713	rc = inflateInit2(&pThis->Zlib, MAX_WBITS \| RT_BIT(5) /* autodetect gzip header */);
714	if (rc >= 0)
715	{
716	/*
717	* Read the gzip header from the input stream to check that it's
718	* a gzip stream as specified by the user.
719	*
720	* Note! Since we've told zlib to check for the gzip header, we
721	* prebuffer what we read in the input buffer so it can
722	* be handed on to zlib later on.
723	*/
724	rc = RTVfsIoStrmRead(pThis->hVfsIos, pThis->abBuffer, sizeof(RTZIPGZIPHDR), true /fBlocking/, NULL /pcbRead/);
725	if (RT_SUCCESS(rc))
726	{
727	/* Validate the header and make a copy of it. */
728	PCRTZIPGZIPHDR pHdr = (PCRTZIPGZIPHDR)pThis->abBuffer;
729	if ( pHdr->bId1 == RTZIPGZIPHDR_ID1
730	&& pHdr->bId2 == RTZIPGZIPHDR_ID2
731	&& !(pHdr->fFlags & ~RTZIPGZIPHDR_FLG_VALID_MASK))
732	{
733	if (pHdr->bCompressionMethod == RTZIPGZIPHDR_CM_DEFLATE)
734	rc = VINF_SUCCESS;
735	else
736	rc = VERR_ZIP_UNSUPPORTED_METHOD;
737	}
738	else if ( (fFlags & RTZIPGZIPDECOMP_F_ALLOW_ZLIB_HDR)
739	&& (RT_MAKE_U16(pHdr->bId2, pHdr->bId1) % 31) == 0
740	&& (pHdr->bId1 & 0xf) == RTZIPGZIPHDR_CM_DEFLATE )
741	{
742	pHdr = NULL;
743	rc = VINF_SUCCESS;
744	}
745	else
746	rc = VERR_ZIP_BAD_HEADER;
747	if (RT_SUCCESS(rc))
748	{
749	pThis->Zlib.avail_in = sizeof(RTZIPGZIPHDR);
750	pThis->Zlib.next_in = &pThis->abBuffer[0];
751	if (pHdr)
752	{
753	pThis->Hdr = *pHdr;
754	/* Parse on if there are names or comments. */
755	if (pHdr->fFlags & (RTZIPGZIPHDR_FLG_NAME \| RTZIPGZIPHDR_FLG_COMMENT))
756	{
757	/** @todo Can implement this when someone needs the
758	* name or comment for something useful. */
759	}
760	}
761	if (RT_SUCCESS(rc))
762	{
763	*phVfsIosOut = hVfsIos;
764	return VINF_SUCCESS;
765	}
766	}
767	}
768	}
769	else
770	rc = rtZipGzipConvertErrFromZlib(pThis, rc); /** @todo cleaning up in this situation is going to go wrong. */
771	RTVfsIoStrmRelease(hVfsIos);
772	}
773	else
774	RTVfsIoStrmRelease(hVfsIosIn);
775	return rc;
776	}
777
778
779	RTDECL(int) RTZipGzipCompressIoStream(RTVFSIOSTREAM hVfsIosDst, uint32_t fFlags, uint8_t uLevel, PRTVFSIOSTREAM phVfsIosZip)
780	{
781	AssertPtrReturn(hVfsIosDst, VERR_INVALID_HANDLE);
782	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
783	AssertPtrReturn(phVfsIosZip, VERR_INVALID_POINTER);
784	AssertReturn(uLevel > 0 && uLevel <= 9, VERR_INVALID_PARAMETER);
785
786	uint32_t cRefs = RTVfsIoStrmRetain(hVfsIosDst);
787	AssertReturn(cRefs != UINT32_MAX, VERR_INVALID_HANDLE);
788
789	/*
790	* Create the compression I/O stream.
791	*/
792	RTVFSIOSTREAM hVfsIos;
793	PRTZIPGZIPSTREAM pThis;
794	int rc = RTVfsNewIoStream(&g_rtZipGzipOps, sizeof(RTZIPGZIPSTREAM), RTFILE_O_WRITE, NIL_RTVFS, NIL_RTVFSLOCK,
795	&hVfsIos, (void **)&pThis);
796	if (RT_SUCCESS(rc))
797	{
798	pThis->hVfsIos = hVfsIosDst;
799	pThis->offStream = 0;
800	pThis->fDecompress = false;
801	pThis->SgSeg.pvSeg = &pThis->abBuffer[0];
802	pThis->SgSeg.cbSeg = sizeof(pThis->abBuffer);
803	RTSgBufInit(&pThis->SgBuf, &pThis->SgSeg, 1);
804
805	RT_ZERO(pThis->Zlib);
806	pThis->Zlib.opaque = pThis;
807	pThis->Zlib.next_out = &pThis->abBuffer[0];
808	pThis->Zlib.avail_out = sizeof(pThis->abBuffer);
809
810	rc = deflateInit2(&pThis->Zlib,
811	uLevel,
812	Z_DEFLATED,
813	15 /* Windows Size / + 16 / GZIP header */,
814	9 /* Max memory level for optimal speed */,
815	Z_DEFAULT_STRATEGY);
816
817	if (rc >= 0)
818	{
819	*phVfsIosZip = hVfsIos;
820	return VINF_SUCCESS;
821	}
822
823	rc = rtZipGzipConvertErrFromZlib(pThis, rc); /** @todo cleaning up in this situation is going to go wrong. */
824	RTVfsIoStrmRelease(hVfsIos);
825	}
826	else
827	RTVfsIoStrmRelease(hVfsIosDst);
828	return rc;
829	}
830
831
832
833	/**
834	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnValidate}
835	*/
836	static DECLCALLBACK(int) rtVfsChainGunzip_Validate(PCRTVFSCHAINELEMENTREG pProviderReg, PRTVFSCHAINSPEC pSpec,
837	PRTVFSCHAINELEMSPEC pElement, uint32_t *poffError, PRTERRINFO pErrInfo)
838	{
839	RT_NOREF(pProviderReg, poffError, pErrInfo);
840
841	if (pElement->enmType != RTVFSOBJTYPE_IO_STREAM)
842	return VERR_VFS_CHAIN_ONLY_IOS;
843	if (pElement->enmTypeIn == RTVFSOBJTYPE_INVALID)
844	return VERR_VFS_CHAIN_CANNOT_BE_FIRST_ELEMENT;
845	if ( pElement->enmTypeIn != RTVFSOBJTYPE_FILE
846	&& pElement->enmTypeIn != RTVFSOBJTYPE_IO_STREAM)
847	return VERR_VFS_CHAIN_TAKES_FILE_OR_IOS;
848	if (pSpec->fOpenFile & RTFILE_O_WRITE)
849	return VERR_VFS_CHAIN_READ_ONLY_IOS;
850	if (pElement->cArgs != 0)
851	return VERR_VFS_CHAIN_NO_ARGS;
852
853	return VINF_SUCCESS;
854	}
855
856
857	/**
858	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnInstantiate}
859	*/
860	static DECLCALLBACK(int) rtVfsChainGunzip_Instantiate(PCRTVFSCHAINELEMENTREG pProviderReg, PCRTVFSCHAINSPEC pSpec,
861	PCRTVFSCHAINELEMSPEC pElement, RTVFSOBJ hPrevVfsObj,
862	PRTVFSOBJ phVfsObj, uint32_t *poffError, PRTERRINFO pErrInfo)
863	{
864	RT_NOREF(pProviderReg, pSpec, pElement, poffError, pErrInfo);
865	AssertReturn(hPrevVfsObj != NIL_RTVFSOBJ, VERR_VFS_CHAIN_IPE);
866
867	RTVFSIOSTREAM hVfsIosIn = RTVfsObjToIoStream(hPrevVfsObj);
868	if (hVfsIosIn == NIL_RTVFSIOSTREAM)
869	return VERR_VFS_CHAIN_CAST_FAILED;
870
871	RTVFSIOSTREAM hVfsIos = NIL_RTVFSIOSTREAM;
872	int rc = RTZipGzipDecompressIoStream(hVfsIosIn, 0 /fFlags/, &hVfsIos);
873	RTVfsObjFromIoStream(hVfsIosIn);
874	if (RT_SUCCESS(rc))
875	{
876	*phVfsObj = RTVfsObjFromIoStream(hVfsIos);
877	RTVfsIoStrmRelease(hVfsIos);
878	if (*phVfsObj != NIL_RTVFSOBJ)
879	return VINF_SUCCESS;
880	rc = VERR_VFS_CHAIN_CAST_FAILED;
881	}
882	return rc;
883	}
884
885
886	/**
887	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnCanReuseElement}
888	*/
889	static DECLCALLBACK(bool) rtVfsChainGunzip_CanReuseElement(PCRTVFSCHAINELEMENTREG pProviderReg,
890	PCRTVFSCHAINSPEC pSpec, PCRTVFSCHAINELEMSPEC pElement,
891	PCRTVFSCHAINSPEC pReuseSpec, PCRTVFSCHAINELEMSPEC pReuseElement)
892	{
893	RT_NOREF(pProviderReg, pSpec, pElement, pReuseSpec, pReuseElement);
894	return false;
895	}
896
897
898	/** VFS chain element 'gunzip'. */
899	static RTVFSCHAINELEMENTREG g_rtVfsChainGunzipReg =
900	{
901	/* uVersion = */ RTVFSCHAINELEMENTREG_VERSION,
902	/* fReserved = */ 0,
903	/* pszName = */ "gunzip",
904	/* ListEntry = */ { NULL, NULL },
905	/* pszHelp = */ "Takes an I/O stream and gunzips it. No arguments.",
906	/* pfnValidate = */ rtVfsChainGunzip_Validate,
907	/* pfnInstantiate = */ rtVfsChainGunzip_Instantiate,
908	/* pfnCanReuseElement = */ rtVfsChainGunzip_CanReuseElement,
909	/* uEndMarker = */ RTVFSCHAINELEMENTREG_VERSION
910	};
911
912	RTVFSCHAIN_AUTO_REGISTER_ELEMENT_PROVIDER(&g_rtVfsChainGunzipReg, rtVfsChainGunzipReg);
913
914
915
916	/**
917	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnValidate}
918	*/
919	static DECLCALLBACK(int) rtVfsChainGzip_Validate(PCRTVFSCHAINELEMENTREG pProviderReg, PRTVFSCHAINSPEC pSpec,
920	PRTVFSCHAINELEMSPEC pElement, uint32_t *poffError, PRTERRINFO pErrInfo)
921	{
922	RT_NOREF(pProviderReg);
923
924	/*
925	* Basics.
926	*/
927	if (pElement->enmType != RTVFSOBJTYPE_IO_STREAM)
928	return VERR_VFS_CHAIN_ONLY_IOS;
929	if (pElement->enmTypeIn == RTVFSOBJTYPE_INVALID)
930	return VERR_VFS_CHAIN_CANNOT_BE_FIRST_ELEMENT;
931	if ( pElement->enmTypeIn != RTVFSOBJTYPE_FILE
932	&& pElement->enmTypeIn != RTVFSOBJTYPE_IO_STREAM)
933	return VERR_VFS_CHAIN_TAKES_FILE_OR_IOS;
934	if (pSpec->fOpenFile & RTFILE_O_READ)
935	return VERR_VFS_CHAIN_WRITE_ONLY_IOS;
936	if (pElement->cArgs > 1)
937	return VERR_VFS_CHAIN_AT_MOST_ONE_ARG;
938
939	/*
940	* Optional argument 1..9 indicating the compression level.
941	* We store it in pSpec->uProvider.
942	*/
943	if (pElement->cArgs > 0)
944	{
945	const char *psz = pElement->paArgs[0].psz;
946	if (!*psz \|\| !strcmp(psz, "default"))
947	pElement->uProvider = 6;
948	else if (!strcmp(psz, "fast"))
949	pElement->uProvider = 3;
950	else if ( RT_C_IS_DIGIT(*psz)
951	&& *psz != '0'
952	&& *RTStrStripL(psz + 1) == '\0')
953	pElement->uProvider = *psz - '0';
954	else
955	{
956	*poffError = pElement->paArgs[0].offSpec;
957	return RTErrInfoSet(pErrInfo, VERR_VFS_CHAIN_INVALID_ARGUMENT, "Expected compression level: 1-9, default, or fast");
958	}
959	}
960	else
961	pElement->uProvider = 6;
962
963	return VINF_SUCCESS;
964	}
965
966
967	/**
968	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnInstantiate}
969	*/
970	static DECLCALLBACK(int) rtVfsChainGzip_Instantiate(PCRTVFSCHAINELEMENTREG pProviderReg, PCRTVFSCHAINSPEC pSpec,
971	PCRTVFSCHAINELEMSPEC pElement, RTVFSOBJ hPrevVfsObj,
972	PRTVFSOBJ phVfsObj, uint32_t *poffError, PRTERRINFO pErrInfo)
973	{
974	RT_NOREF(pProviderReg, pSpec, pElement, poffError, pErrInfo);
975	AssertReturn(hPrevVfsObj != NIL_RTVFSOBJ, VERR_VFS_CHAIN_IPE);
976
977	RTVFSIOSTREAM hVfsIosOut = RTVfsObjToIoStream(hPrevVfsObj);
978	if (hVfsIosOut == NIL_RTVFSIOSTREAM)
979	return VERR_VFS_CHAIN_CAST_FAILED;
980
981	RTVFSIOSTREAM hVfsIos = NIL_RTVFSIOSTREAM;
982	int rc = RTZipGzipCompressIoStream(hVfsIosOut, 0 /fFlags/, pElement->uProvider, &hVfsIos);
983	RTVfsObjFromIoStream(hVfsIosOut);
984	if (RT_SUCCESS(rc))
985	{
986	*phVfsObj = RTVfsObjFromIoStream(hVfsIos);
987	RTVfsIoStrmRelease(hVfsIos);
988	if (*phVfsObj != NIL_RTVFSOBJ)
989	return VINF_SUCCESS;
990	rc = VERR_VFS_CHAIN_CAST_FAILED;
991	}
992	return rc;
993	}
994
995
996	/**
997	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnCanReuseElement}
998	*/
999	static DECLCALLBACK(bool) rtVfsChainGzip_CanReuseElement(PCRTVFSCHAINELEMENTREG pProviderReg,
1000	PCRTVFSCHAINSPEC pSpec, PCRTVFSCHAINELEMSPEC pElement,
1001	PCRTVFSCHAINSPEC pReuseSpec, PCRTVFSCHAINELEMSPEC pReuseElement)
1002	{
1003	RT_NOREF(pProviderReg, pSpec, pElement, pReuseSpec, pReuseElement);
1004	return false;
1005	}
1006
1007
1008	/** VFS chain element 'gzip'. */
1009	static RTVFSCHAINELEMENTREG g_rtVfsChainGzipReg =
1010	{
1011	/* uVersion = */ RTVFSCHAINELEMENTREG_VERSION,
1012	/* fReserved = */ 0,
1013	/* pszName = */ "gzip",
1014	/* ListEntry = */ { NULL, NULL },
1015	/* pszHelp = */ "Takes an I/O stream and gzips it.\n"
1016	"Optional argument specifying compression level: 1-9, default, fast",
1017	/* pfnValidate = */ rtVfsChainGzip_Validate,
1018	/* pfnInstantiate = */ rtVfsChainGzip_Instantiate,
1019	/* pfnCanReuseElement = */ rtVfsChainGzip_CanReuseElement,
1020	/* uEndMarker = */ RTVFSCHAINELEMENTREG_VERSION
1021	};
1022
1023	RTVFSCHAIN_AUTO_REGISTER_ELEMENT_PROVIDER(&g_rtVfsChainGzipReg, rtVfsChainGzipReg);
1024

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source: vbox/trunk/src/VBox/Runtime/common/zip/gzipvfs.cpp@ 81106

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