utf-8.cpp@ 331

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1	/* $Id: utf-8.cpp 1 1970-01-01 00:00:00Z vboxsync $ */
2	/** @file
3	* InnoTek Portable Runtime - UTF-8 Decoding.
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	* Header Files *
25	*******************************************************************************/
26	#include <iprt/string.h>
27	#include <iprt/uni.h>
28	#include <iprt/alloc.h>
29	#include <iprt/assert.h>
30	#include <iprt/err.h>
31	#include "internal/string.h"
32
33
34
35	/**
36	* Get get length in code points of a UTF-8 endcoded string.
37	* The string is validated while doing this.
38	*
39	* @returns IPRT status code.
40	* @param psz Pointer to the UTF-8 string.
41	* @param cch The max length of the string. (btw cch = cb)
42	* Use RTSTR_MAX if all of the string is to be examined.s
43	* @param pcuc Where to store the length in unicode code points.
44	*/
45	static int rtUtf8Length(const char psz, size_t cch, size_t pcuc)
46	{
47	const unsigned char puch = (const unsigned char )psz;
48	size_t cCodePoints = 0;
49	while (cch > 0)
50	{
51	const unsigned char uch = *puch;
52	if (!uch)
53	break;
54	if (uch & BIT(7))
55	{
56	/* figure sequence length and validate the first byte */
57	unsigned cb;
58	if ((uch & (BIT(7) \| BIT(6) \| BIT(5))) == (BIT(7) \| BIT(6)))
59	cb = 2;
60	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4))) == (BIT(7) \| BIT(6) \| BIT(5)))
61	cb = 3;
62	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3))) == (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4)))
63	cb = 4;
64	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3) \| BIT(2))) == (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3)))
65	cb = 5;
66	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3) \| BIT(2) \| BIT(1))) == (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3) \| BIT(2)))
67	cb = 6;
68	else
69	{
70	RTStrAssertMsgFailed(("Invalid UTF-8 first byte: %.*Rhxs\n", RT_MIN(cch, 10), puch));
71	return VERR_INVALID_UTF8_ENCODING;
72	}
73
74	/* check length */
75	if (cb > cch)
76	{
77	RTStrAssertMsgFailed(("Invalid UTF-8 length: cb=%d cch=%d (%.*Rhxs)\n", cb, cch, RT_MIN(cch, 10), puch));
78	return VERR_INVALID_UTF8_ENCODING;
79	}
80
81	/* validate the rest */
82	switch (cb)
83	{
84	case 6:
85	RTStrAssertMsgReturn((puch[5] & (BIT(7) \| BIT(6))) == BIT(7), ("6/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
86	case 5:
87	RTStrAssertMsgReturn((puch[4] & (BIT(7) \| BIT(6))) == BIT(7), ("5/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
88	case 4:
89	RTStrAssertMsgReturn((puch[3] & (BIT(7) \| BIT(6))) == BIT(7), ("4/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
90	case 3:
91	RTStrAssertMsgReturn((puch[2] & (BIT(7) \| BIT(6))) == BIT(7), ("3/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
92	case 2:
93	RTStrAssertMsgReturn((puch[1] & (BIT(7) \| BIT(6))) == BIT(7), ("2/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
94	break;
95	}
96
97	/* validate the code point. */
98	RTUNICP uc;
99	switch (cb)
100	{
101	case 6:
102	uc = (puch[5] & 0x3f)
103	\| ((RTUNICP)(puch[4] & 0x3f) << 6)
104	\| ((RTUNICP)(puch[3] & 0x3f) << 12)
105	\| ((RTUNICP)(puch[2] & 0x3f) << 18)
106	\| ((RTUNICP)(puch[1] & 0x3f) << 24)
107	\| ((RTUNICP)(uch & 0x01) << 30);
108	RTStrAssertMsgReturn(uc >= 0x04000000 && uc <= 0x7fffffff,
109	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
110	break;
111	case 5:
112	uc = (puch[4] & 0x3f)
113	\| ((RTUNICP)(puch[3] & 0x3f) << 6)
114	\| ((RTUNICP)(puch[2] & 0x3f) << 12)
115	\| ((RTUNICP)(puch[1] & 0x3f) << 18)
116	\| ((RTUNICP)(uch & 0x03) << 24);
117	RTStrAssertMsgReturn(uc >= 0x00200000 && uc <= 0x03ffffff,
118	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
119	break;
120	case 4:
121	uc = (puch[3] & 0x3f)
122	\| ((RTUNICP)(puch[2] & 0x3f) << 6)
123	\| ((RTUNICP)(puch[1] & 0x3f) << 12)
124	\| ((RTUNICP)(uch & 0x07) << 18);
125	RTStrAssertMsgReturn(uc >= 0x00010000 && uc <= 0x001fffff,
126	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
127	break;
128	case 3:
129	uc = (puch[2] & 0x3f)
130	\| ((RTUNICP)(puch[1] & 0x3f) << 6)
131	\| ((RTUNICP)(uch & 0x0f) << 12);
132	RTStrAssertMsgReturn(uc >= 0x00000800 && uc <= 0x0000fffd,
133	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch),
134	uc == 0xffff \|\| uc == 0xfffe ? VERR_CODE_POINT_ENDIAN_INDICATOR : VERR_INVALID_UTF8_ENCODING);
135	RTStrAssertMsgReturn(uc < 0xd800 \|\| uc > 0xdfff,
136	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_CODE_POINT_SURROGATE);
137	break;
138	case 2:
139	uc = (puch[1] & 0x3f)
140	\| ((RTUNICP)(uch & 0x1f) << 6);
141	RTStrAssertMsgReturn(uc >= 0x00000080 && uc <= 0x000007ff,
142	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
143	break;
144	}
145
146	/* advance */
147	cch -= cb;
148	puch += cb;
149	}
150	else
151	{
152	/* one ASCII byte */
153	puch++;
154	cch--;
155	}
156	cCodePoints++;
157	}
158
159	/* done */
160	*pcuc = cCodePoints;
161	return VINF_SUCCESS;
162	}
163
164
165	/**
166	* Decodes and UTF-8 string into an array of unicode code point.
167	*
168	* Since we know the input is valid, we do not perform encoding or length checks.
169	*
170	* @returns iprt status code.
171	* @param psz The UTF-8 string to recode. This is a valid encoding.
172	* @param cch The number of chars (the type char, so bytes if you like) to process of the UTF-8 string.
173	* The recoding will stop when cch or '\\0' is reached. Pass RTSTR_MAX to process up to '\\0'.
174	* @param paCps Where to store the code points array.
175	* @param cCps The number of RTUNICP items the paCps buffer can hold, excluding the terminator ('\\0').
176	* @param pcCps Where to store the actual number of decoded code points. This excludes the terminator.
177	*/
178	static int rtUtf8Decode(const char psz, size_t cch, PRTUNICP paCps, size_t cCps, size_t pcCps)
179	{
180	int rc = VINF_SUCCESS;
181	const unsigned char puch = (const unsigned char )psz;
182	const PRTUNICP pCpEnd = paCps + cCps;
183	PRTUNICP pCp = paCps;
184	Assert(pCpEnd >= pCp);
185	while (cch > 0)
186	{
187	/* read the next char and check for terminator. */
188	const unsigned char uch = *puch;
189	if (!uch)
190	break;
191
192	/* check for output overflow */
193	if (pCp >= pCpEnd)
194	{
195	rc = VERR_BUFFER_OVERFLOW;
196	break;
197	}
198
199	/* decode and recode the code point */
200	if (!(uch & BIT(7)))
201	{
202	*pCp++ = uch;
203	puch++;
204	cch--;
205	}
206	#ifdef RT_STRICT
207	else if (!(uch & BIT(6)))
208	AssertMsgFailed(("Internal error!\n"));
209	#endif
210	else if (!(uch & BIT(5)))
211	{
212	*pCp++ = (puch[1] & 0x3f)
213	\| ((uint16_t)(uch & 0x1f) << 6);
214	puch += 2;
215	cch -= 2;
216	}
217	else if (!(uch & BIT(4)))
218	{
219	*pCp++ = (puch[2] & 0x3f)
220	\| ((uint16_t)(puch[1] & 0x3f) << 6)
221	\| ((uint16_t)(uch & 0x0f) << 12);
222	puch += 3;
223	cch -= 3;
224	}
225	else if (!(uch & BIT(3)))
226	{
227	*pCp++ = (puch[3] & 0x3f)
228	\| ((RTUNICP)(puch[2] & 0x3f) << 6)
229	\| ((RTUNICP)(puch[1] & 0x3f) << 12)
230	\| ((RTUNICP)(uch & 0x07) << 18);
231	puch += 4;
232	cch -= 4;
233	}
234	else if (!(uch & BIT(2)))
235	{
236	*pCp++ = (puch[4] & 0x3f)
237	\| ((RTUNICP)(puch[3] & 0x3f) << 6)
238	\| ((RTUNICP)(puch[2] & 0x3f) << 12)
239	\| ((RTUNICP)(puch[1] & 0x3f) << 18)
240	\| ((RTUNICP)(uch & 0x03) << 24);
241	puch += 5;
242	cch -= 6;
243	}
244	else
245	{
246	Assert(!(uch & BIT(1)));
247	*pCp++ = (puch[5] & 0x3f)
248	\| ((RTUNICP)(puch[4] & 0x3f) << 6)
249	\| ((RTUNICP)(puch[3] & 0x3f) << 12)
250	\| ((RTUNICP)(puch[2] & 0x3f) << 18)
251	\| ((RTUNICP)(puch[1] & 0x3f) << 24)
252	\| ((RTUNICP)(uch & 0x01) << 30);
253	puch += 6;
254	cch -= 6;
255	}
256	}
257
258	/* done */
259	*pCp = 0;
260	*pcCps = pCp - paCps;
261	return rc;
262	}
263
264
265	RTDECL(size_t) RTStrUniLen(const char *psz)
266	{
267	size_t cCodePoints;
268	int rc = rtUtf8Length(psz, RTSTR_MAX, &cCodePoints);
269	return RT_SUCCESS(rc) ? cCodePoints : 0;
270	}
271
272
273	RTDECL(int) RTStrUniLenEx(const char psz, size_t cch, size_t pcCps)
274	{
275	size_t cCodePoints;
276	int rc = rtUtf8Length(psz, cch, &cCodePoints);
277	if (pcCps)
278	*pcCps = RT_SUCCESS(rc) ? cCodePoints : 0;
279	return rc;
280	}
281
282
283	RTDECL(int) RTStrToUni(const char pszString, PRTUNICP ppaCps)
284	{
285	/*
286	* Validate input.
287	*/
288	Assert(VALID_PTR(pszString));
289	Assert(VALID_PTR(ppaCps));
290	*ppaCps = NULL;
291
292	/*
293	* Validate the UTF-8 input and count its code points.
294	*/
295	size_t cCps;
296	int rc = rtUtf8Length(pszString, RTSTR_MAX, &cCps);
297	if (RT_SUCCESS(rc))
298	{
299	/*
300	* Allocate buffer.
301	*/
302	PRTUNICP paCps = (PRTUNICP)RTMemAlloc((cCps + 1) * sizeof(RTUNICP));
303	if (paCps)
304	{
305	/*
306	* Decode the string.
307	*/
308	rc = rtUtf8Decode(pszString, RTSTR_MAX, paCps, cCps, &cCps);
309	if (RT_SUCCESS(rc))
310	{
311	*ppaCps = paCps;
312	return rc;
313	}
314	RTMemFree(paCps);
315	}
316	else
317	rc = VERR_NO_CODE_POINT_MEMORY;
318	}
319	return rc;
320	}
321
322
323	RTDECL(int) RTStrToUniEx(const char pszString, size_t cchString, PRTUNICP ppaCps, size_t cCps, size_t *pcCps)
324	{
325	/*
326	* Validate input.
327	*/
328	Assert(VALID_PTR(pszString));
329	Assert(VALID_PTR(ppaCps));
330	Assert(!pcCps \|\| VALID_PTR(pcCps));
331
332	/*
333	* Validate the UTF-8 input and count the code points.
334	*/
335	size_t cCpsResult;
336	int rc = rtUtf8Length(pszString, cchString, &cCpsResult);
337	if (RT_SUCCESS(rc))
338	{
339	if (pcCps)
340	*pcCps = cCpsResult;
341
342	/*
343	* Check buffer size / Allocate buffer.
344	*/
345	bool fShouldFree;
346	PRTUNICP paCpsResult;
347	if (cCps > 0 && *ppaCps)
348	{
349	fShouldFree = false;
350	if (cCps <= cCpsResult)
351	return VERR_BUFFER_OVERFLOW;
352	paCpsResult = *ppaCps;
353	}
354	else
355	{
356	*ppaCps = NULL;
357	fShouldFree = true;
358	cCps = RT_MAX(cCpsResult + 1, cCps);
359	paCpsResult = (PRTUNICP)RTMemAlloc(cCps * sizeof(RTUNICP));
360	}
361	if (paCpsResult)
362	{
363	/*
364	* Encode the UTF-16 string.
365	*/
366	rc = rtUtf8Decode(pszString, cchString, paCpsResult, cCps - 1, &cCpsResult);
367	if (RT_SUCCESS(rc))
368	{
369	*ppaCps = paCpsResult;
370	return rc;
371	}
372	if (fShouldFree)
373	RTMemFree(paCpsResult);
374	}
375	else
376	rc = VERR_NO_CODE_POINT_MEMORY;
377	}
378	return rc;
379	}
380
381
382	/**
383	* Calculates the UTF-16 length of a string, validating the encoding while doing so.
384	*
385	* @returns IPRT status code.
386	* @param psz Pointer to the UTF-8 string.
387	* @param cch The max length of the string. (btw cch = cb)
388	* Use RTSTR_MAX if all of the string is to be examined.s
389	* @param pcwc Where to store the length of the UTF-16 string as a number of RTUTF16 characters.
390	*/
391	static int rtUtf8CalcUtf16Length(const char psz, size_t cch, size_t pcwc)
392	{
393	const unsigned char puch = (const unsigned char )psz;
394	size_t cwc = 0;
395	while (cch > 0)
396	{
397	const unsigned char uch = *puch;
398	if (!uch)
399	break;
400	if (!(uch & BIT(7)))
401	{
402	/* one ASCII byte */
403	cwc++;
404	puch++;
405	cch--;
406	}
407	else
408	{
409	/* figure sequence length and validate the first byte */
410	unsigned cb;
411	if ((uch & (BIT(7) \| BIT(6) \| BIT(5))) == (BIT(7) \| BIT(6)))
412	cb = 2;
413	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4))) == (BIT(7) \| BIT(6) \| BIT(5)))
414	cb = 3;
415	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3))) == (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4)))
416	cb = 4;
417	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3) \| BIT(2))) == (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3)))
418	cb = 5;
419	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3) \| BIT(2) \| BIT(1))) == (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3) \| BIT(2)))
420	cb = 6;
421	else
422	{
423	RTStrAssertMsgFailed(("Invalid UTF-8 first byte: %.*Rhxs\n", RT_MIN(cch, 10), puch));
424	return VERR_INVALID_UTF8_ENCODING;
425	}
426
427	/* check length */
428	if (cb > cch)
429	{
430	RTStrAssertMsgFailed(("Invalid UTF-8 length: cb=%d cch=%d (%.*Rhxs)\n", cb, cch, RT_MIN(cch, 10), puch));
431	return VERR_INVALID_UTF8_ENCODING;
432	}
433
434	/* validate the rest */
435	switch (cb)
436	{
437	case 6:
438	RTStrAssertMsgReturn((puch[5] & (BIT(7) \| BIT(6))) == BIT(7), ("6/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
439	case 5:
440	RTStrAssertMsgReturn((puch[4] & (BIT(7) \| BIT(6))) == BIT(7), ("5/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
441	case 4:
442	RTStrAssertMsgReturn((puch[3] & (BIT(7) \| BIT(6))) == BIT(7), ("4/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
443	case 3:
444	RTStrAssertMsgReturn((puch[2] & (BIT(7) \| BIT(6))) == BIT(7), ("3/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
445	case 2:
446	RTStrAssertMsgReturn((puch[1] & (BIT(7) \| BIT(6))) == BIT(7), ("2/%u: %.*Rhxs\n", cb, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
447	break;
448	}
449
450	/* validate the code point. */
451	RTUNICP uc;
452	switch (cb)
453	{
454	case 6:
455	uc = (puch[5] & 0x3f)
456	\| ((RTUNICP)(puch[4] & 0x3f) << 6)
457	\| ((RTUNICP)(puch[3] & 0x3f) << 12)
458	\| ((RTUNICP)(puch[2] & 0x3f) << 18)
459	\| ((RTUNICP)(puch[1] & 0x3f) << 24)
460	\| ((RTUNICP)(uch & 0x01) << 30);
461	RTStrAssertMsgReturn(uc >= 0x04000000 && uc <= 0x7fffffff,
462	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
463	RTStrAssertMsgFailed(("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch));
464	return VERR_CANT_RECODE_AS_UTF16;
465	case 5:
466	uc = (puch[4] & 0x3f)
467	\| ((RTUNICP)(puch[3] & 0x3f) << 6)
468	\| ((RTUNICP)(puch[2] & 0x3f) << 12)
469	\| ((RTUNICP)(puch[1] & 0x3f) << 18)
470	\| ((RTUNICP)(uch & 0x03) << 24);
471	RTStrAssertMsgReturn(uc >= 0x00200000 && uc <= 0x03ffffff,
472	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
473	RTStrAssertMsgFailed(("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch));
474	return VERR_CANT_RECODE_AS_UTF16;
475	case 4:
476	uc = (puch[3] & 0x3f)
477	\| ((RTUNICP)(puch[2] & 0x3f) << 6)
478	\| ((RTUNICP)(puch[1] & 0x3f) << 12)
479	\| ((RTUNICP)(uch & 0x07) << 18);
480	RTStrAssertMsgReturn(uc >= 0x00010000 && uc <= 0x001fffff,
481	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
482	RTStrAssertMsgReturn(uc <= 0x0010ffff,
483	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_CANT_RECODE_AS_UTF16);
484	cwc++;
485	break;
486	case 3:
487	uc = (puch[2] & 0x3f)
488	\| ((RTUNICP)(puch[1] & 0x3f) << 6)
489	\| ((RTUNICP)(uch & 0x0f) << 12);
490	RTStrAssertMsgReturn(uc >= 0x00000800 && uc <= 0x0000fffd,
491	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch),
492	uc == 0xffff \|\| uc == 0xfffe ? VERR_CODE_POINT_ENDIAN_INDICATOR : VERR_INVALID_UTF8_ENCODING);
493	RTStrAssertMsgReturn(uc < 0xd800 \|\| uc > 0xdfff,
494	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_CODE_POINT_SURROGATE);
495	break;
496	case 2:
497	uc = (puch[1] & 0x3f)
498	\| ((RTUNICP)(uch & 0x1f) << 6);
499	RTStrAssertMsgReturn(uc >= 0x00000080 && uc <= 0x000007ff,
500	("%u: cp=%#010RX32: %.*Rhxs\n", cb, uc, RT_MIN(cb + 10, cch), puch), VERR_INVALID_UTF8_ENCODING);
501	break;
502	}
503
504	/* advance */
505	cch -= cb;
506	puch += cb;
507	cwc++;
508	}
509	}
510
511	/* done */
512	*pcwc = cwc;
513	return VINF_SUCCESS;
514	}
515
516
517	/**
518	* Recodes a valid UTF-8 string as UTF-16.
519	*
520	* Since we know the input is valid, we do not perform encoding or length checks.
521	*
522	* @returns iprt status code.
523	* @param psz The UTF-8 string to recode. This is a valid encoding.
524	* @param cch The number of chars (the type char, so bytes if you like) to process of the UTF-8 string.
525	* The recoding will stop when cch or '\\0' is reached. Pass RTSTR_MAX to process up to '\\0'.
526	* @param pwsz Where to store the UTF-16 string.
527	* @param cwc The number of RTUTF16 items the pwsz buffer can hold, excluding the terminator ('\\0').
528	* @param pcwc Where to store the actual number of RTUTF16 items encoded into the UTF-16. This excludes the terminator.
529	*/
530	static int rtUtf8RecodeAsUtf16(const char psz, size_t cch, PRTUTF16 pwsz, size_t cwc, size_t pcwc)
531	{
532	int rc = VINF_SUCCESS;
533	const unsigned char puch = (const unsigned char )psz;
534	const PRTUTF16 pwszEnd = pwsz + cwc;
535	PRTUTF16 pwc = pwsz;
536	Assert(pwszEnd >= pwc);
537	while (cch > 0)
538	{
539	/* read the next char and check for terminator. */
540	const unsigned char uch = *puch;
541	if (!uch)
542	break;
543
544	/* check for output overflow */
545	if (pwc >= pwszEnd)
546	{
547	rc = VERR_BUFFER_OVERFLOW;
548	break;
549	}
550
551	/* decode and recode the code point */
552	if (!(uch & BIT(7)))
553	{
554	*pwc++ = uch;
555	puch++;
556	cch--;
557	}
558	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5))) == (BIT(7) \| BIT(6)))
559	{
560	uint16_t uc = (puch[1] & 0x3f)
561	\| ((uint16_t)(uch & 0x1f) << 6);
562	*pwc++ = uc;
563	puch += 2;
564	cch -= 2;
565	}
566	else if ((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4))) == (BIT(7) \| BIT(6) \| BIT(5)))
567	{
568	uint16_t uc = (puch[2] & 0x3f)
569	\| ((uint16_t)(puch[1] & 0x3f) << 6)
570	\| ((uint16_t)(uch & 0x0f) << 12);
571	*pwc++ = uc;
572	puch += 3;
573	cch -= 3;
574	}
575	else
576	{
577	/* generate surrugate pair */
578	Assert((uch & (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4) \| BIT(3))) == (BIT(7) \| BIT(6) \| BIT(5) \| BIT(4)));
579	RTUNICP uc = (puch[3] & 0x3f)
580	\| ((RTUNICP)(puch[2] & 0x3f) << 6)
581	\| ((RTUNICP)(puch[1] & 0x3f) << 12)
582	\| ((RTUNICP)(uch & 0x07) << 18);
583	if (pwc + 1 >= pwszEnd)
584	{
585	rc = VERR_BUFFER_OVERFLOW;
586	break;
587	}
588	uc -= 0x10000;
589	*pwc++ = 0xd800 \| (uc >> 10);
590	*pwc++ = 0xdc00 \| (uc & 0x3ff);
591	puch += 4;
592	cch -= 4;
593	}
594	}
595
596	/* done */
597	*pwc = '\0';
598	*pcwc = pwc - pwsz;
599	return rc;
600	}
601
602
603	RTDECL(int) RTStrToUtf16(const char pszString, PRTUTF16 ppwszString)
604	{
605	/*
606	* Validate input.
607	*/
608	Assert(VALID_PTR(ppwszString));
609	Assert(VALID_PTR(pszString));
610	*ppwszString = NULL;
611
612	/*
613	* Validate the UTF-8 input and calculate the length of the UTF-16 string.
614	*/
615	size_t cwc;
616	int rc = rtUtf8CalcUtf16Length(pszString, RTSTR_MAX, &cwc);
617	if (RT_SUCCESS(rc))
618	{
619	/*
620	* Allocate buffer.
621	*/
622	PRTUTF16 pwsz = (PRTUTF16)RTMemAlloc((cwc + 1) * sizeof(RTUTF16));
623	if (pwsz)
624	{
625	/*
626	* Encode the UTF-16 string.
627	*/
628	rc = rtUtf8RecodeAsUtf16(pszString, RTSTR_MAX, pwsz, cwc, &cwc);
629	if (RT_SUCCESS(rc))
630	{
631	*ppwszString = pwsz;
632	return rc;
633	}
634	RTMemFree(pwsz);
635	}
636	else
637	rc = VERR_NO_UTF16_MEMORY;
638	}
639	return rc;
640	}
641
642
643	RTDECL(int) RTStrToUtf16Ex(const char pszString, size_t cchString, PRTUTF16 ppwsz, size_t cwc, size_t *pcwc)
644	{
645	/*
646	* Validate input.
647	*/
648	Assert(VALID_PTR(pszString));
649	Assert(VALID_PTR(ppwsz));
650	Assert(!pcwc \|\| VALID_PTR(pcwc));
651
652	/*
653	* Validate the UTF-8 input and calculate the length of the UTF-16 string.
654	*/
655	size_t cwcResult;
656	int rc = rtUtf8CalcUtf16Length(pszString, cchString, &cwcResult);
657	if (RT_SUCCESS(rc))
658	{
659	if (pcwc)
660	*pcwc = cwcResult;
661
662	/*
663	* Check buffer size / Allocate buffer.
664	*/
665	bool fShouldFree;
666	PRTUTF16 pwszResult;
667	if (cwc > 0 && *ppwsz)
668	{
669	fShouldFree = false;
670	if (cwc <= cwcResult)
671	return VERR_BUFFER_OVERFLOW;
672	pwszResult = *ppwsz;
673	}
674	else
675	{
676	*ppwsz = NULL;
677	fShouldFree = true;
678	cwc = RT_MAX(cwcResult + 1, cwc);
679	pwszResult = (PRTUTF16)RTMemAlloc(cwc * sizeof(RTUTF16));
680	}
681	if (pwszResult)
682	{
683	/*
684	* Encode the UTF-16 string.
685	*/
686	rc = rtUtf8RecodeAsUtf16(pszString, cchString, pwszResult, cwc - 1, &cwcResult);
687	if (RT_SUCCESS(rc))
688	{
689	*ppwsz = pwszResult;
690	return rc;
691	}
692	if (fShouldFree)
693	RTMemFree(pwszResult);
694	}
695	else
696	rc = VERR_NO_UTF16_MEMORY;
697	}
698	return rc;
699	}
700
701
702	RTDECL(size_t) RTStrCalcUtf16Len(const char *psz)
703	{
704	size_t cwc;
705	int rc = rtUtf8CalcUtf16Length(psz, RTSTR_MAX, &cwc);
706	return RT_SUCCESS(rc) ? cwc : 0;
707	}
708
709
710	RTDECL(int) RTStrCalcUtf16LenEx(const char psz, size_t cch, size_t pcwc)
711	{
712	size_t cwc;
713	int rc = rtUtf8CalcUtf16Length(psz, cch, &cwc);
714	if (pcwc)
715	*pcwc = RT_SUCCESS(rc) ? cwc : ~(size_t)0;
716	return rc;
717	}
718
719
720	/**
721	* Handle invalid encodings passed to RTStrGetCp() and RTStrGetCpEx().
722	* @returns rc
723	* @param ppsz The pointer to the the string position point.
724	* @param pCp Where to store RTUNICP_INVALID.
725	* @param rc The iprt error code.
726	*/
727	static int rtStrGetCpExFailure(const char **ppsz, PRTUNICP pCp, int rc)
728	{
729	/*
730	* Try find a valid encoding.
731	*/
732	(ppsz)++; /* @todo code this! */
733	*pCp = RTUNICP_INVALID;
734	return rc;
735	}
736
737
738	RTDECL(RTUNICP) RTStrGetCpInternal(const char *psz)
739	{
740	RTUNICP Cp;
741	RTStrGetCpExInternal(&psz, &Cp);
742	return Cp;
743	}
744
745
746	RTDECL(int) RTStrGetCpExInternal(const char **ppsz, PRTUNICP pCp)
747	{
748	const unsigned char puch = (const unsigned char )*ppsz;
749	const unsigned char uch = *puch;
750	RTUNICP uc;
751
752	/* ASCII ? */
753	if (!(uch & BIT(7)))
754	{
755	uc = uch;
756	puch++;
757	}
758	else if (uch & BIT(6))
759	{
760	/* figure the length and validate the first octet. */
761	unsigned cb;
762	if (!(uch & BIT(5)))
763	cb = 2;
764	else if (!(uch & BIT(4)))
765	cb = 3;
766	else if (!(uch & BIT(3)))
767	cb = 4;
768	else if (!(uch & BIT(2)))
769	cb = 5;
770	else if (!(uch & BIT(1)))
771	cb = 6;
772	else
773	{
774	RTStrAssertMsgFailed(("Invalid UTF-8 first byte: %.Rhxs\n", RT_MIN(strlen((char )puch), 10), puch));
775	return rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING);
776	}
777
778	/* validate the rest */
779	switch (cb)
780	{
781	case 6:
782	RTStrAssertMsgReturn((puch[5] & 0xc0) == 0x80, ("6/%u: %.Rhxs\n", cb, RT_MIN(cb + 10, strlen((char )puch)), puch),
783	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
784	case 5:
785	RTStrAssertMsgReturn((puch[4] & 0xc0) == 0x80, ("5/%u: %.Rhxs\n", cb, RT_MIN(cb + 10, strlen((char )puch)), puch),
786	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
787	case 4:
788	RTStrAssertMsgReturn((puch[3] & 0xc0) == 0x80, ("4/%u: %.Rhxs\n", cb, RT_MIN(cb + 10, strlen((char )puch)), puch),
789	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
790	case 3:
791	RTStrAssertMsgReturn((puch[2] & 0xc0) == 0x80, ("3/%u: %.Rhxs\n", cb, RT_MIN(cb + 10, strlen((char )puch)), puch),
792	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
793	case 2:
794	RTStrAssertMsgReturn((puch[1] & 0xc0) == 0x80, ("2/%u: %.Rhxs\n", cb, RT_MIN(cb + 10, strlen((char )puch)), puch),
795	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
796	break;
797	}
798
799	/* get and validate the code point. */
800	switch (cb)
801	{
802	case 6:
803	uc = (puch[5] & 0x3f)
804	\| ((RTUNICP)(puch[4] & 0x3f) << 6)
805	\| ((RTUNICP)(puch[3] & 0x3f) << 12)
806	\| ((RTUNICP)(puch[2] & 0x3f) << 18)
807	\| ((RTUNICP)(puch[1] & 0x3f) << 24)
808	\| ((RTUNICP)(uch & 0x01) << 30);
809	RTStrAssertMsgReturn(uc >= 0x04000000 && uc <= 0x7fffffff,
810	("%u: cp=%#010RX32: %.Rhxs\n", cb, uc, RT_MIN(cb + 10, strlen((char )puch)), puch),
811	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
812	break;
813	case 5:
814	uc = (puch[4] & 0x3f)
815	\| ((RTUNICP)(puch[3] & 0x3f) << 6)
816	\| ((RTUNICP)(puch[2] & 0x3f) << 12)
817	\| ((RTUNICP)(puch[1] & 0x3f) << 18)
818	\| ((RTUNICP)(uch & 0x03) << 24);
819	RTStrAssertMsgReturn(uc >= 0x00200000 && uc <= 0x03ffffff,
820	("%u: cp=%#010RX32: %.Rhxs\n", cb, uc, RT_MIN(cb + 10, strlen((char )puch)), puch),
821	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
822	break;
823	case 4:
824	uc = (puch[3] & 0x3f)
825	\| ((RTUNICP)(puch[2] & 0x3f) << 6)
826	\| ((RTUNICP)(puch[1] & 0x3f) << 12)
827	\| ((RTUNICP)(uch & 0x07) << 18);
828	RTStrAssertMsgReturn(uc >= 0x00010000 && uc <= 0x001fffff,
829	("%u: cp=%#010RX32: %.Rhxs\n", cb, uc, RT_MIN(cb + 10, strlen((char )puch)), puch),
830	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
831	break;
832	case 3:
833	uc = (puch[2] & 0x3f)
834	\| ((RTUNICP)(puch[1] & 0x3f) << 6)
835	\| ((RTUNICP)(uch & 0x0f) << 12);
836	RTStrAssertMsgReturn(uc >= 0x00000800 && uc <= 0x0000fffd,
837	("%u: cp=%#010RX32: %.Rhxs\n", cb, uc, RT_MIN(cb + 10, strlen((char )puch)), puch),
838	rtStrGetCpExFailure(ppsz, pCp, uc == 0xffff \|\| uc == 0xfffe ? VERR_CODE_POINT_ENDIAN_INDICATOR : VERR_INVALID_UTF8_ENCODING));
839	RTStrAssertMsgReturn(uc < 0xd800 \|\| uc > 0xdfff,
840	("%u: cp=%#010RX32: %.Rhxs\n", cb, uc, RT_MIN(cb + 10, strlen((char )puch)), puch),
841	rtStrGetCpExFailure(ppsz, pCp, VERR_CODE_POINT_SURROGATE));
842	break;
843	case 2:
844	uc = (puch[1] & 0x3f)
845	\| ((RTUNICP)(uch & 0x1f) << 6);
846	RTStrAssertMsgReturn(uc >= 0x00000080 && uc <= 0x000007ff,
847	("%u: cp=%#010RX32: %.Rhxs\n", cb, uc, RT_MIN(cb + 10, strlen((char )puch)), puch),
848	rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING));
849	break;
850	default: /* impossible, but GCC is bitching. */
851	uc = RTUNICP_INVALID;
852	break;
853	}
854	puch += cb;
855	}
856	else
857	{
858	/* 6th bit is always set. */
859	RTStrAssertMsgFailed(("Invalid UTF-8 first byte: %.Rhxs\n", RT_MIN(strlen((char )puch), 10), puch));
860	return rtStrGetCpExFailure(ppsz, pCp, VERR_INVALID_UTF8_ENCODING);
861	}
862	*pCp = uc;
863	ppsz = (const char )puch;
864	return VINF_SUCCESS;
865	}
866
867
868	RTDECL(char ) RTStrPutCpInternal(char psz, RTUNICP uc)
869	{
870	unsigned char puch = (unsigned char )psz;
871	if (uc < 0x80)
872	*puch++ = (unsigned char )uc;
873	else if (uc < 0x00000800)
874	{
875	*puch++ = 0xc0 \| (uc >> 6);
876	*puch++ = 0x80 \| (uc & 0x3f);
877	}
878	else if (uc < 0x00010000)
879	{
880	if ( uc < 0x0000d8000
881	\|\| ( uc > 0x0000dfff
882	&& uc < 0x0000fffe))
883	{
884	*puch++ = 0xe0 \| (uc >> 12);
885	*puch++ = 0x80 \| ((uc >> 6) & 0x3f);
886	*puch++ = 0x80 \| (uc & 0x3f);
887	}
888	else
889	{
890	AssertMsgFailed(("Invalid code point U+%05x!\n", uc));
891	*puch++ = 0x7f;
892	}
893	}
894	else if (uc < 0x00200000)
895	{
896	*puch++ = 0xf0 \| (uc >> 18);
897	*puch++ = 0x80 \| ((uc >> 12) & 0x3f);
898	*puch++ = 0x80 \| ((uc >> 6) & 0x3f);
899	*puch++ = 0x80 \| (uc & 0x3f);
900	}
901	else if (uc < 0x04000000)
902	{
903	*puch++ = 0xf1 \| (uc >> 24);
904	*puch++ = 0x80 \| ((uc >> 18) & 0x3f);
905	*puch++ = 0x80 \| ((uc >> 12) & 0x3f);
906	*puch++ = 0x80 \| ((uc >> 6) & 0x3f);
907	*puch++ = 0x80 \| (uc & 0x3f);
908	}
909	else if (uc <= 0x7fffffff)
910	{
911	*puch++ = 0xf3 \| (uc >> 30);
912	*puch++ = 0x80 \| ((uc >> 24) & 0x3f);
913	*puch++ = 0x80 \| ((uc >> 18) & 0x3f);
914	*puch++ = 0x80 \| ((uc >> 12) & 0x3f);
915	*puch++ = 0x80 \| ((uc >> 6) & 0x3f);
916	*puch++ = 0x80 \| (uc & 0x3f);
917	}
918	else
919	{
920	AssertMsgFailed(("Invalid code point U+%08x!\n", uc));
921	*puch++ = 0x7f;
922	}
923
924	return (char *)puch;
925	}
926
927
928	RTDECL(char ) RTStrPrevCp(const char pszStart, const char *psz)
929	{
930	if (pszStart < psz)
931	{
932	/* simple char? */
933	const unsigned char puch = (const unsigned char )psz;
934	unsigned uch = *--puch;
935	if (!(uch & BIT(7)))
936	return (char *)puch;
937	RTStrAssertMsgReturn(!(uch & BIT(6)), ("uch=%#x\n", uch), (char *)pszStart);
938
939	/* two or more. */
940	uint32_t uMask = 0xffffffc0;
941	while ( (const unsigned char *)pszStart < puch
942	&& !(uMask & 1))
943	{
944	unsigned uch = *--puch;
945	if ((uch & 0xc0) != 0x80)
946	{
947	RTStrAssertMsgReturn((uch & (uMask >> 1)) == (uMask & 0xff),
948	("Invalid UTF-8 encoding: %.Rhxs puch=%p psz=%p\n", psz - (char )puch, puch, psz),
949	(char *)pszStart);
950	return (char *)puch;
951	}
952	uMask >>= 1;
953	}
954	RTStrAssertMsgFailed(("Invalid UTF-8 encoding: %.Rhxs puch=%p psz=%p\n", psz - (char )puch, puch, psz));
955	}
956	return (char *)pszStart;
957	}
958

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source: vbox/trunk/src/VBox/Runtime/utf-8.cpp@ 331

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