| // © 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; |
| } |
| } |
