base64-utf16.cpp

Last change on this file was 106061, checked in by vboxsync, 7 weeks ago
Copyright year updates by scm.
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1	/* $Id: base64-utf16.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* IPRT - Base64, MIME content transfer encoding.
4	*
5	* @note The base64.cpp file must be diffable with this one.
6	* Fixed typically applies to both files.
7	*/
8
9	/*
10	* Copyright (C) 2009-2024 Oracle and/or its affiliates.
11	*
12	* This file is part of VirtualBox base platform packages, as
13	* available from https://www.virtualbox.org.
14	*
15	* This program is free software; you can redistribute it and/or
16	* modify it under the terms of the GNU General Public License
17	* as published by the Free Software Foundation, in version 3 of the
18	* License.
19	*
20	* This program is distributed in the hope that it will be useful, but
21	* WITHOUT ANY WARRANTY; without even the implied warranty of
22	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23	* General Public License for more details.
24	*
25	* You should have received a copy of the GNU General Public License
26	* along with this program; if not, see <https://www.gnu.org/licenses>.
27	*
28	* The contents of this file may alternatively be used under the terms
29	* of the Common Development and Distribution License Version 1.0
30	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
31	* in the VirtualBox distribution, in which case the provisions of the
32	* CDDL are applicable instead of those of the GPL.
33	*
34	* You may elect to license modified versions of this file under the
35	* terms and conditions of either the GPL or the CDDL or both.
36	*
37	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
38	*/
39
40
41	/*********************************************************************************************************************************
42	* Header Files *
43	*********************************************************************************************************************************/
44	#include <iprt/base64.h>
45	#include "internal/iprt.h"
46
47	#include <iprt/assert.h>
48	#include <iprt/err.h>
49	#include <iprt/string.h>
50	#include <iprt/uni.h>
51	#ifdef RT_STRICT
52	# include <iprt/asm.h>
53	#endif
54
55	#include "base64.h"
56
57
58	/** Translates the given character. */
59	DECL_FORCE_INLINE(uint8_t) rtBase64TranslateUtf16(RTUTF16 wc)
60	{
61	if (wc < RT_ELEMENTS(g_au8rtBase64CharToVal))
62	return g_au8rtBase64CharToVal[wc];
63	if (RTUniCpIsSpace(wc))
64	return BASE64_SPACE;
65	return BASE64_INVALID;
66	}
67
68
69	/** Fetched the next character in the string and translates it. */
70	DECL_FORCE_INLINE(uint8_t) rtBase64TranslateNextUtf16(PCRTUTF16 pwszString, size_t cwcStringMax)
71	{
72	if (cwcStringMax > 0)
73	return rtBase64TranslateUtf16(*pwszString);
74	return BASE64_NULL;
75	}
76
77
78	/*
79	* Mostly the same as RTBase64DecodedSizeEx, except for the wider character
80	* type and therefore more careful handling of g_szrtBase64ValToChar and additional
81	* space characters. Fixes must be applied to both copies of the code.
82	*/
83	RTDECL(ssize_t) RTBase64DecodedUtf16SizeEx(PCRTUTF16 pwszString, size_t cwcStringMax, PRTUTF16 *ppwszEnd)
84	{
85	#ifdef RT_STRICT
86	rtBase64Sanity();
87	#endif
88
89	/*
90	* Walk the string until a non-encoded or non-space character is encountered.
91	*/
92	uint32_t c6Bits = 0;
93	uint8_t u8;
94
95	while ((u8 = rtBase64TranslateNextUtf16(pwszString, cwcStringMax)) != BASE64_NULL)
96	{
97	if (u8 < 64)
98	c6Bits++;
99	else if (RT_UNLIKELY(u8 != BASE64_SPACE))
100	break;
101
102	/* advance */
103	pwszString++;
104	cwcStringMax--;
105	}
106
107	/*
108	* Padding can only be found at the end and there is
109	* only 1 or 2 padding chars. Deal with it first.
110	*/
111	unsigned cbPad = 0;
112	if (u8 == BASE64_PAD)
113	{
114	cbPad = 1;
115	c6Bits++;
116	pwszString++;
117	cwcStringMax--;
118	while ((u8 = rtBase64TranslateNextUtf16(pwszString, cwcStringMax)) != BASE64_NULL)
119	{
120	if (u8 != BASE64_SPACE)
121	{
122	if (u8 != BASE64_PAD)
123	break;
124	c6Bits++;
125	cbPad++;
126	}
127	pwszString++;
128	cwcStringMax--;
129	}
130	if (cbPad >= 3)
131	return -1;
132	}
133
134	/*
135	* Invalid char and no where to indicate where the
136	* Base64 text ends? Return failure.
137	*/
138	if ( u8 == BASE64_INVALID
139	&& !ppwszEnd)
140	return -1;
141
142	/*
143	* Recalc 6-bit to 8-bit and adjust for padding.
144	*/
145	if (ppwszEnd)
146	*ppwszEnd = (PRTUTF16)pwszString;
147	return rtBase64DecodedSizeRecalc(c6Bits, cbPad);
148	}
149	RT_EXPORT_SYMBOL(RTBase64DecodedUtf16SizeEx);
150
151
152	RTDECL(ssize_t) RTBase64DecodedUtf16Size(PCRTUTF16 pwszString, PRTUTF16 *ppwszEnd)
153	{
154	return RTBase64DecodedUtf16SizeEx(pwszString, RTSTR_MAX, ppwszEnd);
155	}
156	RT_EXPORT_SYMBOL(RTBase64DecodedUtf16Size);
157
158
159	RTDECL(int) RTBase64DecodeUtf16Ex(PCRTUTF16 pwszString, size_t cwcStringMax, void *pvData, size_t cbData,
160	size_t pcbActual, PRTUTF16 ppwszEnd)
161	{
162	#ifdef RT_STRICT
163	rtBase64Sanity();
164	#endif
165
166	/*
167	* Process input in groups of 4 input / 3 output chars.
168	*/
169	uint8_t u8Trio[3] = { 0, 0, 0 }; /* shuts up gcc */
170	uint8_t pbData = (uint8_t )pvData;
171	uint8_t u8;
172	unsigned c6Bits = 0;
173
174	for (;;)
175	{
176	/* The first 6-bit group. */
177	while ((u8 = rtBase64TranslateNextUtf16(pwszString, cwcStringMax)) == BASE64_SPACE)
178	pwszString++, cwcStringMax--;
179	if (u8 >= 64)
180	{
181	c6Bits = 0;
182	break;
183	}
184	u8Trio[0] = u8 << 2;
185	pwszString++;
186	cwcStringMax--;
187
188	/* The second 6-bit group. */
189	while ((u8 = rtBase64TranslateNextUtf16(pwszString, cwcStringMax)) == BASE64_SPACE)
190	pwszString++, cwcStringMax--;
191	if (u8 >= 64)
192	{
193	c6Bits = 1;
194	break;
195	}
196	u8Trio[0] \|= u8 >> 4;
197	u8Trio[1] = u8 << 4;
198	pwszString++;
199	cwcStringMax--;
200
201	/* The third 6-bit group. */
202	u8 = BASE64_INVALID;
203	while ((u8 = rtBase64TranslateNextUtf16(pwszString, cwcStringMax)) == BASE64_SPACE)
204	pwszString++, cwcStringMax--;
205	if (u8 >= 64)
206	{
207	c6Bits = 2;
208	break;
209	}
210	u8Trio[1] \|= u8 >> 2;
211	u8Trio[2] = u8 << 6;
212	pwszString++;
213	cwcStringMax--;
214
215	/* The fourth 6-bit group. */
216	u8 = BASE64_INVALID;
217	while ((u8 = rtBase64TranslateNextUtf16(pwszString, cwcStringMax)) == BASE64_SPACE)
218	pwszString++, cwcStringMax--;
219	if (u8 >= 64)
220	{
221	c6Bits = 3;
222	break;
223	}
224	u8Trio[2] \|= u8;
225	pwszString++;
226	cwcStringMax--;
227
228	/* flush the trio */
229	if (cbData < 3)
230	return VERR_BUFFER_OVERFLOW;
231	cbData -= 3;
232	pbData[0] = u8Trio[0];
233	pbData[1] = u8Trio[1];
234	pbData[2] = u8Trio[2];
235	pbData += 3;
236	}
237
238	/*
239	* Padding can only be found at the end and there is
240	* only 1 or 2 padding chars. Deal with it first.
241	*/
242	unsigned cbPad = 0;
243	if (u8 == BASE64_PAD)
244	{
245	cbPad = 1;
246	pwszString++;
247	cwcStringMax--;
248	while ((u8 = rtBase64TranslateNextUtf16(pwszString, cwcStringMax)) != BASE64_NULL)
249	{
250	if (u8 != BASE64_SPACE)
251	{
252	if (u8 != BASE64_PAD)
253	break;
254	cbPad++;
255	}
256	pwszString++;
257	cwcStringMax--;
258	}
259	if (cbPad >= 3)
260	return VERR_INVALID_BASE64_ENCODING;
261	}
262
263	/*
264	* Invalid char and no where to indicate where the
265	* Base64 text ends? Return failure.
266	*/
267	if ( u8 == BASE64_INVALID
268	&& !ppwszEnd)
269	return VERR_INVALID_BASE64_ENCODING;
270
271	/*
272	* Check padding vs. pending sextets, if anything left to do finish it off.
273	*/
274	if (c6Bits \|\| cbPad)
275	{
276	if (c6Bits + cbPad != 4)
277	return VERR_INVALID_BASE64_ENCODING;
278
279	switch (c6Bits)
280	{
281	case 1:
282	u8Trio[1] = u8Trio[2] = 0;
283	break;
284	case 2:
285	u8Trio[2] = 0;
286	break;
287	case 3:
288	default:
289	break;
290	}
291	switch (3 - cbPad)
292	{
293	case 1:
294	if (cbData < 1)
295	return VERR_BUFFER_OVERFLOW;
296	cbData--;
297	pbData[0] = u8Trio[0];
298	pbData++;
299	break;
300
301	case 2:
302	if (cbData < 2)
303	return VERR_BUFFER_OVERFLOW;
304	cbData -= 2;
305	pbData[0] = u8Trio[0];
306	pbData[1] = u8Trio[1];
307	pbData += 2;
308	break;
309
310	default:
311	break;
312	}
313	}
314
315	/*
316	* Set optional return values and return successfully.
317	*/
318	if (ppwszEnd)
319	*ppwszEnd = (PRTUTF16)pwszString;
320	if (pcbActual)
321	pcbActual = pbData - (uint8_t )pvData;
322	return VINF_SUCCESS;
323	}
324	RT_EXPORT_SYMBOL(RTBase64DecodeUtf16Ex);
325
326
327	RTDECL(int) RTBase64DecodeUtf16(PCRTUTF16 pwszString, void pvData, size_t cbData, size_t pcbActual, PRTUTF16 *ppwszEnd)
328	{
329	return RTBase64DecodeUtf16Ex(pwszString, RTSTR_MAX, pvData, cbData, pcbActual, ppwszEnd);
330	}
331	RT_EXPORT_SYMBOL(RTBase64DecodeUtf16);
332
333
334	RTDECL(size_t) RTBase64EncodedUtf16Length(size_t cbData)
335	{
336	return RTBase64EncodedLengthEx(cbData, 0);
337	}
338	RT_EXPORT_SYMBOL(RTBase64EncodedUtf16Length);
339
340
341	RTDECL(size_t) RTBase64EncodedUtf16LengthEx(size_t cbData, uint32_t fFlags)
342	{
343	return RTBase64EncodedLengthEx(cbData, fFlags);
344	}
345	RT_EXPORT_SYMBOL(RTBase64EncodedUtf16LengthEx);
346
347
348	RTDECL(int) RTBase64EncodeUtf16(const void pvData, size_t cbData, PRTUTF16 pwszBuf, size_t cwcBuf, size_t pcwcActual)
349	{
350	return RTBase64EncodeUtf16Ex(pvData, cbData, 0, pwszBuf, cwcBuf, pcwcActual);
351	}
352	RT_EXPORT_SYMBOL(RTBase64EncodeUtf16);
353
354
355	/*
356	* Please note that RTBase64EncodeEx contains an almost exact copy of
357	* this code, just using different output character type and variable prefixes.
358	* So, all fixes must be applied to both versions of the code.
359	*/
360	RTDECL(int) RTBase64EncodeUtf16Ex(const void *pvData, size_t cbData, uint32_t fFlags,
361	PRTUTF16 pwszBuf, size_t cwcBuf, size_t *pcwcActual)
362	{
363	/* Expand the EOL style flags: */
364	size_t const cchEol = g_acchrtBase64EolStyles[fFlags & RTBASE64_FLAGS_EOL_STYLE_MASK];
365	char const chEol0 = g_aachrtBase64EolStyles[fFlags & RTBASE64_FLAGS_EOL_STYLE_MASK][0];
366	char const chEol1 = g_aachrtBase64EolStyles[fFlags & RTBASE64_FLAGS_EOL_STYLE_MASK][1];
367	Assert(cchEol == (chEol0 != '\0' ? 1U : 0U) + (chEol1 != '\0' ? 1U : 0U));
368
369	/*
370	* Process whole "trios" of input data.
371	*/
372	uint8_t u8A;
373	uint8_t u8B;
374	uint8_t u8C;
375	size_t cwcLineFeed = cchEol ? cwcBuf - RTBASE64_LINE_LEN : ~(size_t)0;
376	const uint8_t pbSrc = (const uint8_t )pvData;
377	PRTUTF16 pwcDst = pwszBuf;
378	while (cbData >= 3)
379	{
380	if (cwcBuf < 4 + 1)
381	return VERR_BUFFER_OVERFLOW;
382
383	/* encode */
384	u8A = pbSrc[0];
385	pwcDst[0] = g_szrtBase64ValToChar[u8A >> 2];
386	u8B = pbSrc[1];
387	pwcDst[1] = g_szrtBase64ValToChar[((u8A << 4) & 0x3f) \| (u8B >> 4)];
388	u8C = pbSrc[2];
389	pwcDst[2] = g_szrtBase64ValToChar[((u8B << 2) & 0x3f) \| (u8C >> 6)];
390	pwcDst[3] = g_szrtBase64ValToChar[u8C & 0x3f];
391
392	/* advance */
393	cwcBuf -= 4;
394	pwcDst += 4;
395	cbData -= 3;
396	pbSrc += 3;
397
398	/* deal out end-of-line */
399	if (cwcBuf == cwcLineFeed && cbData && cchEol)
400	{
401	if (cwcBuf < cchEol + 1)
402	return VERR_BUFFER_OVERFLOW;
403	cwcBuf -= cchEol;
404	*pwcDst++ = chEol0;
405	if (chEol1)
406	*pwcDst++ = chEol1;
407	cwcLineFeed = cwcBuf - RTBASE64_LINE_LEN;
408	}
409	}
410
411	/*
412	* Deal with the odd bytes and string termination.
413	*/
414	if (cbData)
415	{
416	if (cwcBuf < 4 + 1)
417	return VERR_BUFFER_OVERFLOW;
418	switch (cbData)
419	{
420	case 1:
421	u8A = pbSrc[0];
422	pwcDst[0] = g_szrtBase64ValToChar[u8A >> 2];
423	pwcDst[1] = g_szrtBase64ValToChar[(u8A << 4) & 0x3f];
424	pwcDst[2] = '=';
425	pwcDst[3] = '=';
426	break;
427	case 2:
428	u8A = pbSrc[0];
429	pwcDst[0] = g_szrtBase64ValToChar[u8A >> 2];
430	u8B = pbSrc[1];
431	pwcDst[1] = g_szrtBase64ValToChar[((u8A << 4) & 0x3f) \| (u8B >> 4)];
432	pwcDst[2] = g_szrtBase64ValToChar[(u8B << 2) & 0x3f];
433	pwcDst[3] = '=';
434	break;
435	}
436	pwcDst += 4;
437	}
438
439	*pwcDst = '\0';
440
441	if (pcwcActual)
442	*pcwcActual = pwcDst - pwszBuf;
443	return VINF_SUCCESS;
444	}
445	RT_EXPORT_SYMBOL(RTBase64EncodeUtf16Ex);
446

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source: vbox/trunk/src/VBox/Runtime/common/string/base64-utf16.cpp

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