[apple/icu.git] / icuSources / common / utrie_swap.cpp

// © 2018 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html

// utrie_swap.cpp
// created: 2018aug08 Markus W. Scherer

#include "unicode/utypes.h"
#include "cmemory.h"
#include "ucptrie_impl.h"
#include "udataswp.h"
#include "utrie.h"
#include "utrie2_impl.h"

// These functions for swapping different generations of ICU code point tries are here
// so that their implementation files need not depend on swapper code,
// need not depend on each other, and so that other swapper code
// need not depend on other trie code.

namespace {

constexpr int32_t ASCII_LIMIT = 0x80;

}  // namespace

U_CAPI int32_t U_EXPORT2
utrie_swap(const UDataSwapper *ds,
           const void *inData, int32_t length, void *outData,
           UErrorCode *pErrorCode) {
    const UTrieHeader *inTrie;
    UTrieHeader trie;
    int32_t size;
    UBool dataIs32;

    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==NULL || inData==NULL || (length>=0 && outData==NULL)) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    /* setup and swapping */
    if(length>=0 && (uint32_t)length<sizeof(UTrieHeader)) {
        *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
        return 0;
    }

    inTrie=(const UTrieHeader *)inData;
    trie.signature=ds->readUInt32(inTrie->signature);
    trie.options=ds->readUInt32(inTrie->options);
    trie.indexLength=udata_readInt32(ds, inTrie->indexLength);
    trie.dataLength=udata_readInt32(ds, inTrie->dataLength);

    if( trie.signature!=0x54726965 ||
        (trie.options&UTRIE_OPTIONS_SHIFT_MASK)!=UTRIE_SHIFT ||
        ((trie.options>>UTRIE_OPTIONS_INDEX_SHIFT)&UTRIE_OPTIONS_SHIFT_MASK)!=UTRIE_INDEX_SHIFT ||
        trie.indexLength<UTRIE_BMP_INDEX_LENGTH ||
        (trie.indexLength&(UTRIE_SURROGATE_BLOCK_COUNT-1))!=0 ||
        trie.dataLength<UTRIE_DATA_BLOCK_LENGTH ||
        (trie.dataLength&(UTRIE_DATA_GRANULARITY-1))!=0 ||
        ((trie.options&UTRIE_OPTIONS_LATIN1_IS_LINEAR)!=0 && trie.dataLength<(UTRIE_DATA_BLOCK_LENGTH+0x100))
    ) {
        *pErrorCode=U_INVALID_FORMAT_ERROR; /* not a UTrie */
        return 0;
    }

    dataIs32=(UBool)((trie.options&UTRIE_OPTIONS_DATA_IS_32_BIT)!=0);
    size=sizeof(UTrieHeader)+trie.indexLength*2+trie.dataLength*(dataIs32?4:2);

    if(length>=0) {
        UTrieHeader *outTrie;

        if(length<size) {
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }

        outTrie=(UTrieHeader *)outData;

        /* swap the header */
        ds->swapArray32(ds, inTrie, sizeof(UTrieHeader), outTrie, pErrorCode);

        /* swap the index and the data */
        if(dataIs32) {
            ds->swapArray16(ds, inTrie+1, trie.indexLength*2, outTrie+1, pErrorCode);
            ds->swapArray32(ds, (const uint16_t *)(inTrie+1)+trie.indexLength, trie.dataLength*4,
                                     (uint16_t *)(outTrie+1)+trie.indexLength, pErrorCode);
        } else {
            ds->swapArray16(ds, inTrie+1, (trie.indexLength+trie.dataLength)*2, outTrie+1, pErrorCode);
        }
    }

    return size;
}

U_CAPI int32_t U_EXPORT2
utrie2_swap(const UDataSwapper *ds,
            const void *inData, int32_t length, void *outData,
            UErrorCode *pErrorCode) {
    const UTrie2Header *inTrie;
    UTrie2Header trie;
    int32_t dataLength, size;
    UTrie2ValueBits valueBits;

    if(U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==NULL || inData==NULL || (length>=0 && outData==NULL)) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    /* setup and swapping */
    if(length>=0 && length<(int32_t)sizeof(UTrie2Header)) {
        *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
        return 0;
    }

    inTrie=(const UTrie2Header *)inData;
    trie.signature=ds->readUInt32(inTrie->signature);
    trie.options=ds->readUInt16(inTrie->options);
    trie.indexLength=ds->readUInt16(inTrie->indexLength);
    trie.shiftedDataLength=ds->readUInt16(inTrie->shiftedDataLength);

    valueBits=(UTrie2ValueBits)(trie.options&UTRIE2_OPTIONS_VALUE_BITS_MASK);
    dataLength=(int32_t)trie.shiftedDataLength<<UTRIE2_INDEX_SHIFT;

    if( trie.signature!=UTRIE2_SIG ||
        valueBits<0 || UTRIE2_COUNT_VALUE_BITS<=valueBits ||
        trie.indexLength<UTRIE2_INDEX_1_OFFSET ||
        dataLength<UTRIE2_DATA_START_OFFSET
    ) {
        *pErrorCode=U_INVALID_FORMAT_ERROR; /* not a UTrie */
        return 0;
    }

    size=sizeof(UTrie2Header)+trie.indexLength*2;
    switch(valueBits) {
    case UTRIE2_16_VALUE_BITS:
        size+=dataLength*2;
        break;
    case UTRIE2_32_VALUE_BITS:
        size+=dataLength*4;
        break;
    default:
        *pErrorCode=U_INVALID_FORMAT_ERROR;
        return 0;
    }

    if(length>=0) {
        UTrie2Header *outTrie;

        if(length<size) {
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }

        outTrie=(UTrie2Header *)outData;

        /* swap the header */
        ds->swapArray32(ds, &inTrie->signature, 4, &outTrie->signature, pErrorCode);
        ds->swapArray16(ds, &inTrie->options, 12, &outTrie->options, pErrorCode);

        /* swap the index and the data */
        switch(valueBits) {
        case UTRIE2_16_VALUE_BITS:
            ds->swapArray16(ds, inTrie+1, (trie.indexLength+dataLength)*2, outTrie+1, pErrorCode);
            break;
        case UTRIE2_32_VALUE_BITS:
            ds->swapArray16(ds, inTrie+1, trie.indexLength*2, outTrie+1, pErrorCode);
            ds->swapArray32(ds, (const uint16_t *)(inTrie+1)+trie.indexLength, dataLength*4,
                                     (uint16_t *)(outTrie+1)+trie.indexLength, pErrorCode);
            break;
        default:
            *pErrorCode=U_INVALID_FORMAT_ERROR;
            return 0;
        }
    }

    return size;
}

U_CAPI int32_t U_EXPORT2
ucptrie_swap(const UDataSwapper *ds,
             const void *inData, int32_t length, void *outData,
             UErrorCode *pErrorCode) {
    const UCPTrieHeader *inTrie;
    UCPTrieHeader trie;
    int32_t dataLength, size;
    UCPTrieValueWidth valueWidth;

    if(U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || (length>=0 && outData==nullptr)) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    /* setup and swapping */
    if(length>=0 && length<(int32_t)sizeof(UCPTrieHeader)) {
        *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
        return 0;
    }

    inTrie=(const UCPTrieHeader *)inData;
    trie.signature=ds->readUInt32(inTrie->signature);
    trie.options=ds->readUInt16(inTrie->options);
    trie.indexLength=ds->readUInt16(inTrie->indexLength);
    trie.dataLength = ds->readUInt16(inTrie->dataLength);

    UCPTrieType type = (UCPTrieType)((trie.options >> 6) & 3);
    valueWidth = (UCPTrieValueWidth)(trie.options & UCPTRIE_OPTIONS_VALUE_BITS_MASK);
    dataLength = ((int32_t)(trie.options & UCPTRIE_OPTIONS_DATA_LENGTH_MASK) << 4) | trie.dataLength;

    int32_t minIndexLength = type == UCPTRIE_TYPE_FAST ?
        UCPTRIE_BMP_INDEX_LENGTH : UCPTRIE_SMALL_INDEX_LENGTH;
    if( trie.signature!=UCPTRIE_SIG ||
        type > UCPTRIE_TYPE_SMALL ||
        (trie.options & UCPTRIE_OPTIONS_RESERVED_MASK) != 0 ||
        valueWidth > UCPTRIE_VALUE_BITS_8 ||
        trie.indexLength < minIndexLength ||
        dataLength < ASCII_LIMIT
    ) {
        *pErrorCode=U_INVALID_FORMAT_ERROR; /* not a UCPTrie */
        return 0;
    }

    size=sizeof(UCPTrieHeader)+trie.indexLength*2;
    switch(valueWidth) {
    case UCPTRIE_VALUE_BITS_16:
        size+=dataLength*2;
        break;
    case UCPTRIE_VALUE_BITS_32:
        size+=dataLength*4;
        break;
    case UCPTRIE_VALUE_BITS_8:
        size+=dataLength;
        break;
    default:
        *pErrorCode=U_INVALID_FORMAT_ERROR;
        return 0;
    }

    if(length>=0) {
        UCPTrieHeader *outTrie;

        if(length<size) {
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }

        outTrie=(UCPTrieHeader *)outData;

        /* swap the header */
        ds->swapArray32(ds, &inTrie->signature, 4, &outTrie->signature, pErrorCode);
        ds->swapArray16(ds, &inTrie->options, 12, &outTrie->options, pErrorCode);

        /* swap the index and the data */
        switch(valueWidth) {
        case UCPTRIE_VALUE_BITS_16:
            ds->swapArray16(ds, inTrie+1, (trie.indexLength+dataLength)*2, outTrie+1, pErrorCode);
            break;
        case UCPTRIE_VALUE_BITS_32:
            ds->swapArray16(ds, inTrie+1, trie.indexLength*2, outTrie+1, pErrorCode);
            ds->swapArray32(ds, (const uint16_t *)(inTrie+1)+trie.indexLength, dataLength*4,
                                     (uint16_t *)(outTrie+1)+trie.indexLength, pErrorCode);
            break;
        case UCPTRIE_VALUE_BITS_8:
            ds->swapArray16(ds, inTrie+1, trie.indexLength*2, outTrie+1, pErrorCode);
            if(inTrie!=outTrie) {
                uprv_memmove((outTrie+1)+trie.indexLength, (inTrie+1)+trie.indexLength, dataLength);
            }
            break;
        default:
            *pErrorCode=U_INVALID_FORMAT_ERROR;
            return 0;
        }
    }

    return size;
}

namespace {

/**
 * Gets the trie version from 32-bit-aligned memory containing the serialized form
 * of a UTrie (version 1), a UTrie2 (version 2), or a UCPTrie (version 3).
 *
 * @param data a pointer to 32-bit-aligned memory containing the serialized form of a trie
 * @param length the number of bytes available at data;
 *               can be more than necessary (see return value)
 * @param anyEndianOk If FALSE, only platform-endian serialized forms are recognized.
 *                    If TRUE, opposite-endian serialized forms are recognized as well.
 * @return the trie version of the serialized form, or 0 if it is not
 *         recognized as a serialized trie
 */
int32_t
getVersion(const void *data, int32_t length, UBool anyEndianOk) {
    uint32_t signature;
    if(length<16 || data==nullptr || (U_POINTER_MASK_LSB(data, 3)!=0)) {
        return 0;
    }
    signature=*(const uint32_t *)data;
    if(signature==UCPTRIE_SIG) {
        return 3;
    }
    if(anyEndianOk && signature==UCPTRIE_OE_SIG) {
        return 3;
    }
    if(signature==UTRIE2_SIG) {
        return 2;
    }
    if(anyEndianOk && signature==UTRIE2_OE_SIG) {
        return 2;
    }
    if(signature==UTRIE_SIG) {
        return 1;
    }
    if(anyEndianOk && signature==UTRIE_OE_SIG) {
        return 1;
    }
    return 0;
}

}  // namespace

U_CAPI int32_t U_EXPORT2
utrie_swapAnyVersion(const UDataSwapper *ds,
                     const void *inData, int32_t length, void *outData,
                     UErrorCode *pErrorCode) {
    if(U_FAILURE(*pErrorCode)) { return 0; }
    switch(getVersion(inData, length, TRUE)) {
    case 1:
        return utrie_swap(ds, inData, length, outData, pErrorCode);
    case 2:
        return utrie2_swap(ds, inData, length, outData, pErrorCode);
    case 3:
        return ucptrie_swap(ds, inData, length, outData, pErrorCode);
    default:
        *pErrorCode=U_INVALID_FORMAT_ERROR;
        return 0;
    }
}
Commit	Line	Data
3d1f044b A	1	// © 2018 and later: Unicode, Inc. and others.
	2	// License & terms of use: http://www.unicode.org/copyright.html
	3
	4	// utrie_swap.cpp
	5	// created: 2018aug08 Markus W. Scherer
	6
	7	#include "unicode/utypes.h"
	8	#include "cmemory.h"
	9	#include "ucptrie_impl.h"
	10	#include "udataswp.h"
	11	#include "utrie.h"
	12	#include "utrie2_impl.h"
	13
	14	// These functions for swapping different generations of ICU code point tries are here
	15	// so that their implementation files need not depend on swapper code,
	16	// need not depend on each other, and so that other swapper code
	17	// need not depend on other trie code.
	18
	19	namespace {
	20
	21	constexpr int32_t ASCII_LIMIT = 0x80;
	22
	23	} // namespace
	24
	25	U_CAPI int32_t U_EXPORT2
	26	utrie_swap(const UDataSwapper *ds,
	27	const void inData, int32_t length, void outData,
	28	UErrorCode *pErrorCode) {
	29	const UTrieHeader *inTrie;
	30	UTrieHeader trie;
	31	int32_t size;
	32	UBool dataIs32;
	33
	34	if(pErrorCode==NULL \|\| U_FAILURE(*pErrorCode)) {
	35	return 0;
	36	}
	37	if(ds==NULL \|\| inData==NULL \|\| (length>=0 && outData==NULL)) {
	38	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
	39	return 0;
	40	}
	41
	42	/* setup and swapping */
	43	if(length>=0 && (uint32_t)length<sizeof(UTrieHeader)) {
	44	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
	45	return 0;
	46	}
	47
	48	inTrie=(const UTrieHeader *)inData;
	49	trie.signature=ds->readUInt32(inTrie->signature);
	50	trie.options=ds->readUInt32(inTrie->options);
	51	trie.indexLength=udata_readInt32(ds, inTrie->indexLength);
	52	trie.dataLength=udata_readInt32(ds, inTrie->dataLength);
	53
	54	if( trie.signature!=0x54726965 \|\|
	55	(trie.options&UTRIE_OPTIONS_SHIFT_MASK)!=UTRIE_SHIFT \|\|
	56	((trie.options>>UTRIE_OPTIONS_INDEX_SHIFT)&UTRIE_OPTIONS_SHIFT_MASK)!=UTRIE_INDEX_SHIFT \|\|
	57	trie.indexLength<UTRIE_BMP_INDEX_LENGTH \|\|
	58	(trie.indexLength&(UTRIE_SURROGATE_BLOCK_COUNT-1))!=0 \|\|
	59	trie.dataLength<UTRIE_DATA_BLOCK_LENGTH \|\|
	60	(trie.dataLength&(UTRIE_DATA_GRANULARITY-1))!=0 \|\|
	61	((trie.options&UTRIE_OPTIONS_LATIN1_IS_LINEAR)!=0 && trie.dataLength<(UTRIE_DATA_BLOCK_LENGTH+0x100))
	62	) {
	63	pErrorCode=U_INVALID_FORMAT_ERROR; / not a UTrie */
	64	return 0;
65	}
66
67	dataIs32=(UBool)((trie.options&UTRIE_OPTIONS_DATA_IS_32_BIT)!=0);
68	size=sizeof(UTrieHeader)+trie.indexLength2+trie.dataLength(dataIs32?4:2);
69
70	if(length>=0) {
71	UTrieHeader *outTrie;
72
73	if(length<size) {
74	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
75	return 0;
76	}
77
78	outTrie=(UTrieHeader *)outData;
79
80	/* swap the header */
81	ds->swapArray32(ds, inTrie, sizeof(UTrieHeader), outTrie, pErrorCode);
82
83	/* swap the index and the data */
84	if(dataIs32) {
85	ds->swapArray16(ds, inTrie+1, trie.indexLength*2, outTrie+1, pErrorCode);
86	ds->swapArray32(ds, (const uint16_t )(inTrie+1)+trie.indexLength, trie.dataLength4,
87	(uint16_t *)(outTrie+1)+trie.indexLength, pErrorCode);
88	} else {
89	ds->swapArray16(ds, inTrie+1, (trie.indexLength+trie.dataLength)*2, outTrie+1, pErrorCode);
90	}
91	}
92
93	return size;
94	}
95
96	U_CAPI int32_t U_EXPORT2
97	utrie2_swap(const UDataSwapper *ds,
98	const void inData, int32_t length, void outData,
99	UErrorCode *pErrorCode) {
100	const UTrie2Header *inTrie;
101	UTrie2Header trie;
102	int32_t dataLength, size;
103	UTrie2ValueBits valueBits;
104
105	if(U_FAILURE(*pErrorCode)) {
106	return 0;
107	}
108	if(ds==NULL \|\| inData==NULL \|\| (length>=0 && outData==NULL)) {
109	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
110	return 0;
111	}
112
113	/* setup and swapping */
114	if(length>=0 && length<(int32_t)sizeof(UTrie2Header)) {
115	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
116	return 0;
117	}
118
119	inTrie=(const UTrie2Header *)inData;
120	trie.signature=ds->readUInt32(inTrie->signature);
121	trie.options=ds->readUInt16(inTrie->options);
122	trie.indexLength=ds->readUInt16(inTrie->indexLength);
123	trie.shiftedDataLength=ds->readUInt16(inTrie->shiftedDataLength);
124
125	valueBits=(UTrie2ValueBits)(trie.options&UTRIE2_OPTIONS_VALUE_BITS_MASK);
126	dataLength=(int32_t)trie.shiftedDataLength<<UTRIE2_INDEX_SHIFT;
127
128	if( trie.signature!=UTRIE2_SIG \|\|
129	valueBits<0 \|\| UTRIE2_COUNT_VALUE_BITS<=valueBits \|\|
130	trie.indexLength<UTRIE2_INDEX_1_OFFSET \|\|
131	dataLength<UTRIE2_DATA_START_OFFSET
132	) {
133	pErrorCode=U_INVALID_FORMAT_ERROR; / not a UTrie */
134	return 0;
135	}
136
137	size=sizeof(UTrie2Header)+trie.indexLength*2;
138	switch(valueBits) {
139	case UTRIE2_16_VALUE_BITS:
140	size+=dataLength*2;
141	break;
142	case UTRIE2_32_VALUE_BITS:
143	size+=dataLength*4;
144	break;
145	default:
146	*pErrorCode=U_INVALID_FORMAT_ERROR;
147	return 0;
148	}
149
150	if(length>=0) {
151	UTrie2Header *outTrie;
152
153	if(length<size) {
154	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
155	return 0;
156	}
157
158	outTrie=(UTrie2Header *)outData;
159
160	/* swap the header */
161	ds->swapArray32(ds, &inTrie->signature, 4, &outTrie->signature, pErrorCode);
162	ds->swapArray16(ds, &inTrie->options, 12, &outTrie->options, pErrorCode);
163
164	/* swap the index and the data */
165	switch(valueBits) {
166	case UTRIE2_16_VALUE_BITS:
167	ds->swapArray16(ds, inTrie+1, (trie.indexLength+dataLength)*2, outTrie+1, pErrorCode);
168	break;
169	case UTRIE2_32_VALUE_BITS:
170	ds->swapArray16(ds, inTrie+1, trie.indexLength*2, outTrie+1, pErrorCode);
171	ds->swapArray32(ds, (const uint16_t )(inTrie+1)+trie.indexLength, dataLength4,
172	(uint16_t *)(outTrie+1)+trie.indexLength, pErrorCode);
173	break;
174	default:
175	*pErrorCode=U_INVALID_FORMAT_ERROR;
176	return 0;
177	}
178	}
179
180	return size;
181	}
182
183	U_CAPI int32_t U_EXPORT2
184	ucptrie_swap(const UDataSwapper *ds,
185	const void inData, int32_t length, void outData,
186	UErrorCode *pErrorCode) {
187	const UCPTrieHeader *inTrie;
188	UCPTrieHeader trie;
189	int32_t dataLength, size;
190	UCPTrieValueWidth valueWidth;
191
192	if(U_FAILURE(*pErrorCode)) {
193	return 0;
194	}
195	if(ds==nullptr \|\| inData==nullptr \|\| (length>=0 && outData==nullptr)) {
196	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
197	return 0;
198	}
199
200	/* setup and swapping */
201	if(length>=0 && length<(int32_t)sizeof(UCPTrieHeader)) {
202	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
203	return 0;
204	}
205
206	inTrie=(const UCPTrieHeader *)inData;
207	trie.signature=ds->readUInt32(inTrie->signature);
208	trie.options=ds->readUInt16(inTrie->options);
209	trie.indexLength=ds->readUInt16(inTrie->indexLength);
210	trie.dataLength = ds->readUInt16(inTrie->dataLength);
211
212	UCPTrieType type = (UCPTrieType)((trie.options >> 6) & 3);
213	valueWidth = (UCPTrieValueWidth)(trie.options & UCPTRIE_OPTIONS_VALUE_BITS_MASK);
214	dataLength = ((int32_t)(trie.options & UCPTRIE_OPTIONS_DATA_LENGTH_MASK) << 4) \| trie.dataLength;
215
216	int32_t minIndexLength = type == UCPTRIE_TYPE_FAST ?
217	UCPTRIE_BMP_INDEX_LENGTH : UCPTRIE_SMALL_INDEX_LENGTH;
218	if( trie.signature!=UCPTRIE_SIG \|\|
219	type > UCPTRIE_TYPE_SMALL \|\|
220	(trie.options & UCPTRIE_OPTIONS_RESERVED_MASK) != 0 \|\|
221	valueWidth > UCPTRIE_VALUE_BITS_8 \|\|
222	trie.indexLength < minIndexLength \|\|
223	dataLength < ASCII_LIMIT
224	) {
225	pErrorCode=U_INVALID_FORMAT_ERROR; / not a UCPTrie */
226	return 0;
227	}
228
229	size=sizeof(UCPTrieHeader)+trie.indexLength*2;
230	switch(valueWidth) {
231	case UCPTRIE_VALUE_BITS_16:
232	size+=dataLength*2;
233	break;
234	case UCPTRIE_VALUE_BITS_32:
235	size+=dataLength*4;
236	break;
237	case UCPTRIE_VALUE_BITS_8:
238	size+=dataLength;
239	break;
240	default:
241	*pErrorCode=U_INVALID_FORMAT_ERROR;
242	return 0;
243	}
244
245	if(length>=0) {
246	UCPTrieHeader *outTrie;
247
248	if(length<size) {
249	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
250	return 0;
251	}
252
253	outTrie=(UCPTrieHeader *)outData;
254
255	/* swap the header */
256	ds->swapArray32(ds, &inTrie->signature, 4, &outTrie->signature, pErrorCode);
257	ds->swapArray16(ds, &inTrie->options, 12, &outTrie->options, pErrorCode);
258
259	/* swap the index and the data */
260	switch(valueWidth) {
261	case UCPTRIE_VALUE_BITS_16:
262	ds->swapArray16(ds, inTrie+1, (trie.indexLength+dataLength)*2, outTrie+1, pErrorCode);
263	break;
264	case UCPTRIE_VALUE_BITS_32:
265	ds->swapArray16(ds, inTrie+1, trie.indexLength*2, outTrie+1, pErrorCode);
266	ds->swapArray32(ds, (const uint16_t )(inTrie+1)+trie.indexLength, dataLength4,
267	(uint16_t *)(outTrie+1)+trie.indexLength, pErrorCode);
268	break;
269	case UCPTRIE_VALUE_BITS_8:
270	ds->swapArray16(ds, inTrie+1, trie.indexLength*2, outTrie+1, pErrorCode);
271	if(inTrie!=outTrie) {
272	uprv_memmove((outTrie+1)+trie.indexLength, (inTrie+1)+trie.indexLength, dataLength);
273	}
274	break;
275	default:
276	*pErrorCode=U_INVALID_FORMAT_ERROR;
277	return 0;
278	}
279	}
280
281	return size;
282	}
283
284	namespace {
285
286	/**
287	* Gets the trie version from 32-bit-aligned memory containing the serialized form
288	* of a UTrie (version 1), a UTrie2 (version 2), or a UCPTrie (version 3).
289	*
290	* @param data a pointer to 32-bit-aligned memory containing the serialized form of a trie
291	* @param length the number of bytes available at data;
292	* can be more than necessary (see return value)
293	* @param anyEndianOk If FALSE, only platform-endian serialized forms are recognized.
294	* If TRUE, opposite-endian serialized forms are recognized as well.
295	* @return the trie version of the serialized form, or 0 if it is not
296	* recognized as a serialized trie
297	*/
298	int32_t
299	getVersion(const void *data, int32_t length, UBool anyEndianOk) {
300	uint32_t signature;
301	if(length<16 \|\| data==nullptr \|\| (U_POINTER_MASK_LSB(data, 3)!=0)) {
302	return 0;
303	}
304	signature=(const uint32_t )data;
305	if(signature==UCPTRIE_SIG) {
306	return 3;
307	}
308	if(anyEndianOk && signature==UCPTRIE_OE_SIG) {
309	return 3;
310	}
311	if(signature==UTRIE2_SIG) {
312	return 2;
313	}
314	if(anyEndianOk && signature==UTRIE2_OE_SIG) {
315	return 2;
316	}
317	if(signature==UTRIE_SIG) {
318	return 1;
319	}
320	if(anyEndianOk && signature==UTRIE_OE_SIG) {
321	return 1;
322	}
323	return 0;
324	}
325
326	} // namespace
327
328	U_CAPI int32_t U_EXPORT2
329	utrie_swapAnyVersion(const UDataSwapper *ds,
330	const void inData, int32_t length, void outData,
331	UErrorCode *pErrorCode) {
332	if(U_FAILURE(*pErrorCode)) { return 0; }
333	switch(getVersion(inData, length, TRUE)) {
334	case 1:
335	return utrie_swap(ds, inData, length, outData, pErrorCode);
336	case 2:
337	return utrie2_swap(ds, inData, length, outData, pErrorCode);
338	case 3:
339	return ucptrie_swap(ds, inData, length, outData, pErrorCode);
340	default:
341	*pErrorCode=U_INVALID_FORMAT_ERROR;
342	return 0;
343	}
344	}