// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ****************************************************************************** * * Copyright (C) 1999-2015, International Business Machines * Corporation and others. All Rights Reserved. * ****************************************************************************** * * * ucnv_io.cpp: * initializes global variables and defines functions pertaining to converter * name resolution aspect of the conversion code. * * new implementation: * * created on: 1999nov22 * created by: Markus W. Scherer * * Use the binary cnvalias.icu (created from convrtrs.txt) to work * with aliases for converter names. * * Date Name Description * 11/22/1999 markus Created * 06/28/2002 grhoten Major overhaul of the converter alias design. * Now an alias can map to different converters * depending on the specified standard. ******************************************************************************* */ #include "unicode/utypes.h" #if !UCONFIG_NO_CONVERSION #include "unicode/ucnv.h" #include "unicode/udata.h" #include "umutex.h" #include "uarrsort.h" #include "uassert.h" #include "udataswp.h" #include "cstring.h" #include "cmemory.h" #include "ucnv_io.h" #include "uenumimp.h" #include "ucln_cmn.h" /* Format of cnvalias.icu ----------------------------------------------------- * * cnvalias.icu is a binary, memory-mappable form of convrtrs.txt. * This binary form contains several tables. All indexes are to uint16_t * units, and not to the bytes (uint8_t units). Addressing everything on * 16-bit boundaries allows us to store more information with small index * numbers, which are also 16-bit in size. The majority of the table (except * the string table) are 16-bit numbers. * * First there is the size of the Table of Contents (TOC). The TOC * entries contain the size of each section. In order to find the offset * you just need to sum up the previous offsets. * The TOC length and entries are an array of uint32_t values. * The first section after the TOC starts immediately after the TOC. * * 1) This section contains a list of converters. This list contains indexes * into the string table for the converter name. The index of this list is * also used by other sections, which are mentioned later on. * This list is not sorted. * * 2) This section contains a list of tags. This list contains indexes * into the string table for the tag name. The index of this list is * also used by other sections, which are mentioned later on. * This list is in priority order of standards. * * 3) This section contains a list of sorted unique aliases. This * list contains indexes into the string table for the alias name. The * index of this list is also used by other sections, like the 4th section. * The index for the 3rd and 4th section is used to get the * alias -> converter name mapping. Section 3 and 4 form a two column table. * Some of the most significant bits of each index may contain other * information (see findConverter for details). * * 4) This section contains a list of mapped converter names. Consider this * as a table that maps the 3rd section to the 1st section. This list contains * indexes into the 1st section. The index of this list is the same index in * the 3rd section. There is also some extra information in the high bits of * each converter index in this table. Currently it's only used to say that * an alias mapped to this converter is ambiguous. See UCNV_CONVERTER_INDEX_MASK * and UCNV_AMBIGUOUS_ALIAS_MAP_BIT for more information. This section is * the predigested form of the 5th section so that an alias lookup can be fast. * * 5) This section contains a 2D array with indexes to the 6th section. This * section is the full form of all alias mappings. The column index is the * index into the converter list (column header). The row index is the index * to tag list (row header). This 2D array is the top part a 3D array. The * third dimension is in the 6th section. * * 6) This is blob of variable length arrays. Each array starts with a size, * and is followed by indexes to alias names in the string table. This is * the third dimension to the section 5. No other section should be referencing * this section. * * 7) Starting in ICU 3.6, this can be a UConverterAliasOptions struct. Its * presence indicates that a section 9 exists. UConverterAliasOptions specifies * what type of string normalization is used among other potential things in the * future. * * 8) This is the string table. All strings are indexed on an even address. * There are two reasons for this. First many chip architectures locate strings * faster on even address boundaries. Second, since all indexes are 16-bit * numbers, this string table can be 128KB in size instead of 64KB when we * only have strings starting on an even address. * * 9) When present this is a set of prenormalized strings from section 8. This * table contains normalized strings with the dashes and spaces stripped out, * and all strings lowercased. In the future, the options in section 7 may state * other types of normalization. * * Here is the concept of section 5 and 6. It's a 3D cube. Each tag * has a unique alias among all converters. That same alias can * be mentioned in other standards on different converters, * but only one alias per tag can be unique. * * * Converter Names (Usually in TR22 form) * -------------------------------------------. * T / /| * a / / | * g / / | * s / / | * / / | * ------------------------------------------/ | * A | | | * l | | | * i | | / * a | | / * s | | / * e | | / * s | |/ * ------------------------------------------- * * * * Here is what it really looks like. It's like swiss cheese. * There are holes. Some converters aren't recognized by * a standard, or they are really old converters that the * standard doesn't recognize anymore. * * Converter Names (Usually in TR22 form) * -------------------------------------------. * T /##########################################/| * a / # # /# * g / # ## ## ### # ### ### ### #/ * s / # ##### #### ## ## #/# * / ### # # ## # # # ### # # #/## * ------------------------------------------/# # * A |### # # ## # # # ### # # #|# # * l |# # # # # ## # #|# # * i |# # # # # # #|# * a |# #|# * s | #|# * e * s * */ /** * Used by the UEnumeration API */ typedef struct UAliasContext { uint32_t listOffset; uint32_t listIdx; } UAliasContext; static const char DATA_NAME[] = "cnvalias"; static const char DATA_TYPE[] = "icu"; static UDataMemory *gAliasData=nullptr; static icu::UInitOnce gAliasDataInitOnce {}; enum { tocLengthIndex=0, converterListIndex=1, tagListIndex=2, aliasListIndex=3, untaggedConvArrayIndex=4, taggedAliasArrayIndex=5, taggedAliasListsIndex=6, tableOptionsIndex=7, stringTableIndex=8, normalizedStringTableIndex=9, offsetsCount, /* length of the swapper's temporary offsets[] */ minTocLength=8 /* min. tocLength in the file, does not count the tocLengthIndex! */ }; static const UConverterAliasOptions defaultTableOptions = { UCNV_IO_UNNORMALIZED, 0 /* containsCnvOptionInfo */ }; static UConverterAlias gMainTable; #define GET_STRING … #define GET_NORMALIZED_STRING … static UBool U_CALLCONV isAcceptable(void * /*context*/, const char * /*type*/, const char * /*name*/, const UDataInfo *pInfo) { return (UBool)( pInfo->size>=20 && pInfo->isBigEndian==U_IS_BIG_ENDIAN && pInfo->charsetFamily==U_CHARSET_FAMILY && pInfo->dataFormat[0]==0x43 && /* dataFormat="CvAl" */ pInfo->dataFormat[1]==0x76 && pInfo->dataFormat[2]==0x41 && pInfo->dataFormat[3]==0x6c && pInfo->formatVersion[0]==3); } static UBool U_CALLCONV ucnv_io_cleanup() { if (gAliasData) { udata_close(gAliasData); gAliasData = nullptr; } gAliasDataInitOnce.reset(); uprv_memset(&gMainTable, 0, sizeof(gMainTable)); return true; /* Everything was cleaned up */ } static void U_CALLCONV initAliasData(UErrorCode &errCode) { UDataMemory *data; const uint16_t *table; const uint32_t *sectionSizes; uint32_t tableStart; uint32_t currOffset; ucln_common_registerCleanup(UCLN_COMMON_UCNV_IO, ucnv_io_cleanup); U_ASSERT(gAliasData == nullptr); data = udata_openChoice(nullptr, DATA_TYPE, DATA_NAME, isAcceptable, nullptr, &errCode); if(U_FAILURE(errCode)) { return; } sectionSizes = (const uint32_t *)udata_getMemory(data); table = (const uint16_t *)sectionSizes; tableStart = sectionSizes[0]; if (tableStart < minTocLength) { errCode = U_INVALID_FORMAT_ERROR; udata_close(data); return; } gAliasData = data; gMainTable.converterListSize = sectionSizes[1]; gMainTable.tagListSize = sectionSizes[2]; gMainTable.aliasListSize = sectionSizes[3]; gMainTable.untaggedConvArraySize = sectionSizes[4]; gMainTable.taggedAliasArraySize = sectionSizes[5]; gMainTable.taggedAliasListsSize = sectionSizes[6]; gMainTable.optionTableSize = sectionSizes[7]; gMainTable.stringTableSize = sectionSizes[8]; if (tableStart > 8) { gMainTable.normalizedStringTableSize = sectionSizes[9]; } currOffset = tableStart * (sizeof(uint32_t)/sizeof(uint16_t)) + (sizeof(uint32_t)/sizeof(uint16_t)); gMainTable.converterList = table + currOffset; currOffset += gMainTable.converterListSize; gMainTable.tagList = table + currOffset; currOffset += gMainTable.tagListSize; gMainTable.aliasList = table + currOffset; currOffset += gMainTable.aliasListSize; gMainTable.untaggedConvArray = table + currOffset; currOffset += gMainTable.untaggedConvArraySize; gMainTable.taggedAliasArray = table + currOffset; /* aliasLists is a 1's based array, but it has a padding character */ currOffset += gMainTable.taggedAliasArraySize; gMainTable.taggedAliasLists = table + currOffset; currOffset += gMainTable.taggedAliasListsSize; if (gMainTable.optionTableSize > 0 && ((const UConverterAliasOptions *)(table + currOffset))->stringNormalizationType < UCNV_IO_NORM_TYPE_COUNT) { /* Faster table */ gMainTable.optionTable = (const UConverterAliasOptions *)(table + currOffset); } else { /* Smaller table, or I can't handle this normalization mode! Use the original slower table lookup. */ gMainTable.optionTable = &defaultTableOptions; } currOffset += gMainTable.optionTableSize; gMainTable.stringTable = table + currOffset; currOffset += gMainTable.stringTableSize; gMainTable.normalizedStringTable = ((gMainTable.optionTable->stringNormalizationType == UCNV_IO_UNNORMALIZED) ? gMainTable.stringTable : (table + currOffset)); } static UBool haveAliasData(UErrorCode *pErrorCode) { umtx_initOnce(gAliasDataInitOnce, &initAliasData, *pErrorCode); return U_SUCCESS(*pErrorCode); } static inline UBool isAlias(const char *alias, UErrorCode *pErrorCode) { if(alias==nullptr) { *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; return false; } return (UBool)(*alias!=0); } static uint32_t getTagNumber(const char *tagname) { if (gMainTable.tagList) { uint32_t tagNum; for (tagNum = 0; tagNum < gMainTable.tagListSize; tagNum++) { if (!uprv_stricmp(GET_STRING(gMainTable.tagList[tagNum]), tagname)) { return tagNum; } } } return UINT32_MAX; } /* character types relevant for ucnv_compareNames() */ enum { UIGNORE, ZERO, NONZERO, MINLETTER /* any values from here on are lowercase letter mappings */ }; /* character types for ASCII 00..7F */ static const uint8_t asciiTypes[128] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, 0, 0, 0, 0, 0, 0, 0, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0, 0, 0, 0, 0, 0, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0, 0, 0, 0, 0 }; #define GET_ASCII_TYPE … /* character types for EBCDIC 80..FF */ static const uint8_t ebcdicTypes[128] = { 0, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0, 0, 0, 0, 0, 0, 0, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0, 0, 0, 0, 0, 0, 0, 0, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0, 0, 0, 0, 0, 0, 0, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0, 0, 0, 0, 0, 0, 0, 0, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0, 0, 0, 0, 0, 0, ZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, NONZERO, 0, 0, 0, 0, 0, 0 }; #define GET_EBCDIC_TYPE … #if U_CHARSET_FAMILY==U_ASCII_FAMILY #define GET_CHAR_TYPE … #elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY #define GET_CHAR_TYPE … #else # error U_CHARSET_FAMILY is not valid #endif /* @see ucnv_compareNames */ U_CAPI char * U_CALLCONV ucnv_io_stripASCIIForCompare(char *dst, const char *name) { char *dstItr = dst; uint8_t type, nextType; char c1; UBool afterDigit = false; while ((c1 = *name++) != 0) { type = GET_ASCII_TYPE(c1); switch (type) { case UIGNORE: afterDigit = false; continue; /* ignore all but letters and digits */ case ZERO: if (!afterDigit) { nextType = GET_ASCII_TYPE(*name); if (nextType == ZERO || nextType == NONZERO) { continue; /* ignore leading zero before another digit */ } } break; case NONZERO: afterDigit = true; break; default: c1 = (char)type; /* lowercased letter */ afterDigit = false; break; } *dstItr++ = c1; } *dstItr = 0; return dst; } U_CAPI char * U_CALLCONV ucnv_io_stripEBCDICForCompare(char *dst, const char *name) { char *dstItr = dst; uint8_t type, nextType; char c1; UBool afterDigit = false; while ((c1 = *name++) != 0) { type = GET_EBCDIC_TYPE(c1); switch (type) { case UIGNORE: afterDigit = false; continue; /* ignore all but letters and digits */ case ZERO: if (!afterDigit) { nextType = GET_EBCDIC_TYPE(*name); if (nextType == ZERO || nextType == NONZERO) { continue; /* ignore leading zero before another digit */ } } break; case NONZERO: afterDigit = true; break; default: c1 = (char)type; /* lowercased letter */ afterDigit = false; break; } *dstItr++ = c1; } *dstItr = 0; return dst; } /** * Do a fuzzy compare of two converter/alias names. * The comparison is case-insensitive, ignores leading zeroes if they are not * followed by further digits, and ignores all but letters and digits. * Thus the strings "UTF-8", "utf_8", "u*T@f08" and "Utf 8" are exactly equivalent. * See section 1.4, Charset Alias Matching in Unicode Technical Standard #22 * at http://www.unicode.org/reports/tr22/ * * This is a symmetrical (commutative) operation; order of arguments * is insignificant. This is an important property for sorting the * list (when the list is preprocessed into binary form) and for * performing binary searches on it at run time. * * @param name1 a converter name or alias, zero-terminated * @param name2 a converter name or alias, zero-terminated * @return 0 if the names match, or a negative value if the name1 * lexically precedes name2, or a positive value if the name1 * lexically follows name2. * * @see ucnv_io_stripForCompare */ U_CAPI int U_EXPORT2 ucnv_compareNames(const char *name1, const char *name2) { int rc; uint8_t type, nextType; char c1, c2; UBool afterDigit1 = false, afterDigit2 = false; for (;;) { while ((c1 = *name1++) != 0) { type = GET_CHAR_TYPE(c1); switch (type) { case UIGNORE: afterDigit1 = false; continue; /* ignore all but letters and digits */ case ZERO: if (!afterDigit1) { nextType = GET_CHAR_TYPE(*name1); if (nextType == ZERO || nextType == NONZERO) { continue; /* ignore leading zero before another digit */ } } break; case NONZERO: afterDigit1 = true; break; default: c1 = (char)type; /* lowercased letter */ afterDigit1 = false; break; } break; /* deliver c1 */ } while ((c2 = *name2++) != 0) { type = GET_CHAR_TYPE(c2); switch (type) { case UIGNORE: afterDigit2 = false; continue; /* ignore all but letters and digits */ case ZERO: if (!afterDigit2) { nextType = GET_CHAR_TYPE(*name2); if (nextType == ZERO || nextType == NONZERO) { continue; /* ignore leading zero before another digit */ } } break; case NONZERO: afterDigit2 = true; break; default: c2 = (char)type; /* lowercased letter */ afterDigit2 = false; break; } break; /* deliver c2 */ } /* If we reach the ends of both strings then they match */ if ((c1|c2)==0) { return 0; } /* Case-insensitive comparison */ rc = (int)(unsigned char)c1 - (int)(unsigned char)c2; if (rc != 0) { return rc; } } } /* * search for an alias * return the converter number index for gConverterList */ static inline uint32_t findConverter(const char *alias, UBool *containsOption, UErrorCode *pErrorCode) { uint32_t mid, start, limit; uint32_t lastMid; int result; int isUnnormalized = (gMainTable.optionTable->stringNormalizationType == UCNV_IO_UNNORMALIZED); char strippedName[UCNV_MAX_CONVERTER_NAME_LENGTH]; if (!isUnnormalized) { if (uprv_strlen(alias) >= UCNV_MAX_CONVERTER_NAME_LENGTH) { *pErrorCode = U_BUFFER_OVERFLOW_ERROR; return UINT32_MAX; } /* Lower case and remove ignoreable characters. */ ucnv_io_stripForCompare(strippedName, alias); alias = strippedName; } /* do a binary search for the alias */ start = 0; limit = gMainTable.untaggedConvArraySize; mid = limit; lastMid = UINT32_MAX; for (;;) { mid = (uint32_t)((start + limit) / 2); if (lastMid == mid) { /* Have we moved? */ break; /* We haven't moved, and it wasn't found. */ } lastMid = mid; if (isUnnormalized) { result = ucnv_compareNames(alias, GET_STRING(gMainTable.aliasList[mid])); } else { result = uprv_strcmp(alias, GET_NORMALIZED_STRING(gMainTable.aliasList[mid])); } if (result < 0) { limit = mid; } else if (result > 0) { start = mid; } else { /* Since the gencnval tool folds duplicates into one entry, * this alias in gAliasList is unique, but different standards * may map an alias to different converters. */ if (gMainTable.untaggedConvArray[mid] & UCNV_AMBIGUOUS_ALIAS_MAP_BIT) { *pErrorCode = U_AMBIGUOUS_ALIAS_WARNING; } /* State whether the canonical converter name contains an option. This information is contained in this list in order to maintain backward & forward compatibility. */ if (containsOption) { UBool containsCnvOptionInfo = (UBool)gMainTable.optionTable->containsCnvOptionInfo; *containsOption = (UBool)((containsCnvOptionInfo && ((gMainTable.untaggedConvArray[mid] & UCNV_CONTAINS_OPTION_BIT) != 0)) || !containsCnvOptionInfo); } return gMainTable.untaggedConvArray[mid] & UCNV_CONVERTER_INDEX_MASK; } } return UINT32_MAX; } /* * Is this alias in this list? * alias and listOffset should be non-nullptr. */ static inline UBool isAliasInList(const char *alias, uint32_t listOffset) { if (listOffset) { uint32_t currAlias; uint32_t listCount = gMainTable.taggedAliasLists[listOffset]; /* +1 to skip listCount */ const uint16_t *currList = gMainTable.taggedAliasLists + listOffset + 1; for (currAlias = 0; currAlias < listCount; currAlias++) { if (currList[currAlias] && ucnv_compareNames(alias, GET_STRING(currList[currAlias]))==0) { return true; } } } return false; } /* * Search for an standard name of an alias (what is the default name * that this standard uses?) * return the listOffset for gTaggedAliasLists. If it's 0, * the it couldn't be found, but the parameters are valid. */ static uint32_t findTaggedAliasListsOffset(const char *alias, const char *standard, UErrorCode *pErrorCode) { uint32_t idx; uint32_t listOffset; uint32_t convNum; UErrorCode myErr = U_ZERO_ERROR; uint32_t tagNum = getTagNumber(standard); /* Make a quick guess. Hopefully they used a TR22 canonical alias. */ convNum = findConverter(alias, nullptr, &myErr); if (myErr != U_ZERO_ERROR) { *pErrorCode = myErr; } if (tagNum < (gMainTable.tagListSize - UCNV_NUM_HIDDEN_TAGS) && convNum < gMainTable.converterListSize) { listOffset = gMainTable.taggedAliasArray[tagNum*gMainTable.converterListSize + convNum]; if (listOffset && gMainTable.taggedAliasLists[listOffset + 1]) { return listOffset; } if (myErr == U_AMBIGUOUS_ALIAS_WARNING) { /* Uh Oh! They used an ambiguous alias. We have to search the whole swiss cheese starting at the highest standard affinity. This may take a while. */ for (idx = 0; idx < gMainTable.taggedAliasArraySize; idx++) { listOffset = gMainTable.taggedAliasArray[idx]; if (listOffset && isAliasInList(alias, listOffset)) { uint32_t currTagNum = idx/gMainTable.converterListSize; uint32_t currConvNum = (idx - currTagNum*gMainTable.converterListSize); uint32_t tempListOffset = gMainTable.taggedAliasArray[tagNum*gMainTable.converterListSize + currConvNum]; if (tempListOffset && gMainTable.taggedAliasLists[tempListOffset + 1]) { return tempListOffset; } /* else keep on looking */ /* We could speed this up by starting on the next row because an alias is unique per row, right now. This would change if alias versioning appears. */ } } /* The standard doesn't know about the alias */ } /* else no default name */ return 0; } /* else converter or tag not found */ return UINT32_MAX; } /* Return the canonical name */ static uint32_t findTaggedConverterNum(const char *alias, const char *standard, UErrorCode *pErrorCode) { uint32_t idx; uint32_t listOffset; uint32_t convNum; UErrorCode myErr = U_ZERO_ERROR; uint32_t tagNum = getTagNumber(standard); /* Make a quick guess. Hopefully they used a TR22 canonical alias. */ convNum = findConverter(alias, nullptr, &myErr); if (myErr != U_ZERO_ERROR) { *pErrorCode = myErr; } if (tagNum < (gMainTable.tagListSize - UCNV_NUM_HIDDEN_TAGS) && convNum < gMainTable.converterListSize) { listOffset = gMainTable.taggedAliasArray[tagNum*gMainTable.converterListSize + convNum]; if (listOffset && isAliasInList(alias, listOffset)) { return convNum; } if (myErr == U_AMBIGUOUS_ALIAS_WARNING) { /* Uh Oh! They used an ambiguous alias. We have to search one slice of the swiss cheese. We search only in the requested tag, not the whole thing. This may take a while. */ uint32_t convStart = (tagNum)*gMainTable.converterListSize; uint32_t convLimit = (tagNum+1)*gMainTable.converterListSize; for (idx = convStart; idx < convLimit; idx++) { listOffset = gMainTable.taggedAliasArray[idx]; if (listOffset && isAliasInList(alias, listOffset)) { return idx-convStart; } } /* The standard doesn't know about the alias */ } /* else no canonical name */ } /* else converter or tag not found */ return UINT32_MAX; } U_CAPI const char * ucnv_io_getConverterName(const char *alias, UBool *containsOption, UErrorCode *pErrorCode) { const char *aliasTmp = alias; int32_t i = 0; for (i = 0; i < 2; i++) { if (i == 1) { /* * After the first unsuccess converter lookup, check to see if * the name begins with 'x-'. If it does, strip it off and try * again. This behaviour is similar to how ICU4J does it. */ if (aliasTmp[0] == 'x' && aliasTmp[1] == '-') { aliasTmp = aliasTmp+2; } else { break; } } if(haveAliasData(pErrorCode) && isAlias(aliasTmp, pErrorCode)) { uint32_t convNum = findConverter(aliasTmp, containsOption, pErrorCode); if (convNum < gMainTable.converterListSize) { return GET_STRING(gMainTable.converterList[convNum]); } /* else converter not found */ } else { break; } } return nullptr; } U_CDECL_BEGIN static int32_t U_CALLCONV ucnv_io_countStandardAliases(UEnumeration *enumerator, UErrorCode * /*pErrorCode*/) { int32_t value = 0; UAliasContext *myContext = (UAliasContext *)(enumerator->context); uint32_t listOffset = myContext->listOffset; if (listOffset) { value = gMainTable.taggedAliasLists[listOffset]; } return value; } static const char * U_CALLCONV ucnv_io_nextStandardAliases(UEnumeration *enumerator, int32_t* resultLength, UErrorCode * /*pErrorCode*/) { UAliasContext *myContext = (UAliasContext *)(enumerator->context); uint32_t listOffset = myContext->listOffset; if (listOffset) { uint32_t listCount = gMainTable.taggedAliasLists[listOffset]; const uint16_t *currList = gMainTable.taggedAliasLists + listOffset + 1; if (myContext->listIdx < listCount) { const char *myStr = GET_STRING(currList[myContext->listIdx++]); if (resultLength) { *resultLength = (int32_t)uprv_strlen(myStr); } return myStr; } } /* Either we accessed a zero length list, or we enumerated too far. */ if (resultLength) { *resultLength = 0; } return nullptr; } static void U_CALLCONV ucnv_io_resetStandardAliases(UEnumeration *enumerator, UErrorCode * /*pErrorCode*/) { ((UAliasContext *)(enumerator->context))->listIdx = 0; } static void U_CALLCONV ucnv_io_closeUEnumeration(UEnumeration *enumerator) { uprv_free(enumerator->context); uprv_free(enumerator); } U_CDECL_END /* Enumerate the aliases for the specified converter and standard tag */ static const UEnumeration gEnumAliases = { nullptr, nullptr, ucnv_io_closeUEnumeration, ucnv_io_countStandardAliases, uenum_unextDefault, ucnv_io_nextStandardAliases, ucnv_io_resetStandardAliases }; U_CAPI UEnumeration * U_EXPORT2 ucnv_openStandardNames(const char *convName, const char *standard, UErrorCode *pErrorCode) { UEnumeration *myEnum = nullptr; if (haveAliasData(pErrorCode) && isAlias(convName, pErrorCode)) { uint32_t listOffset = findTaggedAliasListsOffset(convName, standard, pErrorCode); /* When listOffset == 0, we want to acknowledge that the converter name and standard are okay, but there is nothing to enumerate. */ if (listOffset < gMainTable.taggedAliasListsSize) { UAliasContext *myContext; myEnum = static_cast<UEnumeration *>(uprv_malloc(sizeof(UEnumeration))); if (myEnum == nullptr) { *pErrorCode = U_MEMORY_ALLOCATION_ERROR; return nullptr; } uprv_memcpy(myEnum, &gEnumAliases, sizeof(UEnumeration)); myContext = static_cast<UAliasContext *>(uprv_malloc(sizeof(UAliasContext))); if (myContext == nullptr) { *pErrorCode = U_MEMORY_ALLOCATION_ERROR; uprv_free(myEnum); return nullptr; } myContext->listOffset = listOffset; myContext->listIdx = 0; myEnum->context = myContext; } /* else converter or tag not found */ } return myEnum; } static uint16_t ucnv_io_countAliases(const char *alias, UErrorCode *pErrorCode) { if(haveAliasData(pErrorCode) && isAlias(alias, pErrorCode)) { uint32_t convNum = findConverter(alias, nullptr, pErrorCode); if (convNum < gMainTable.converterListSize) { /* tagListNum - 1 is the ALL tag */ int32_t listOffset = gMainTable.taggedAliasArray[(gMainTable.tagListSize - 1)*gMainTable.converterListSize + convNum]; if (listOffset) { return gMainTable.taggedAliasLists[listOffset]; } /* else this shouldn't happen. internal program error */ } /* else converter not found */ } return 0; } static uint16_t ucnv_io_getAliases(const char *alias, uint16_t start, const char **aliases, UErrorCode *pErrorCode) { if(haveAliasData(pErrorCode) && isAlias(alias, pErrorCode)) { uint32_t currAlias; uint32_t convNum = findConverter(alias, nullptr, pErrorCode); if (convNum < gMainTable.converterListSize) { /* tagListNum - 1 is the ALL tag */ int32_t listOffset = gMainTable.taggedAliasArray[(gMainTable.tagListSize - 1)*gMainTable.converterListSize + convNum]; if (listOffset) { uint32_t listCount = gMainTable.taggedAliasLists[listOffset]; /* +1 to skip listCount */ const uint16_t *currList = gMainTable.taggedAliasLists + listOffset + 1; for (currAlias = start; currAlias < listCount; currAlias++) { aliases[currAlias] = GET_STRING(currList[currAlias]); } } /* else this shouldn't happen. internal program error */ } /* else converter not found */ } return 0; } static const char * ucnv_io_getAlias(const char *alias, uint16_t n, UErrorCode *pErrorCode) { if(haveAliasData(pErrorCode) && isAlias(alias, pErrorCode)) { uint32_t convNum = findConverter(alias, nullptr, pErrorCode); if (convNum < gMainTable.converterListSize) { /* tagListNum - 1 is the ALL tag */ int32_t listOffset = gMainTable.taggedAliasArray[(gMainTable.tagListSize - 1)*gMainTable.converterListSize + convNum]; if (listOffset) { uint32_t listCount = gMainTable.taggedAliasLists[listOffset]; /* +1 to skip listCount */ const uint16_t *currList = gMainTable.taggedAliasLists + listOffset + 1; if (n < listCount) { return GET_STRING(currList[n]); } *pErrorCode = U_INDEX_OUTOFBOUNDS_ERROR; } /* else this shouldn't happen. internal program error */ } /* else converter not found */ } return nullptr; } static uint16_t ucnv_io_countStandards(UErrorCode *pErrorCode) { if (haveAliasData(pErrorCode)) { /* Don't include the empty list */ return (uint16_t)(gMainTable.tagListSize - UCNV_NUM_HIDDEN_TAGS); } return 0; } U_CAPI const char * U_EXPORT2 ucnv_getStandard(uint16_t n, UErrorCode *pErrorCode) { if (haveAliasData(pErrorCode)) { if (n < gMainTable.tagListSize - UCNV_NUM_HIDDEN_TAGS) { return GET_STRING(gMainTable.tagList[n]); } *pErrorCode = U_INDEX_OUTOFBOUNDS_ERROR; } return nullptr; } U_CAPI const char * U_EXPORT2 ucnv_getStandardName(const char *alias, const char *standard, UErrorCode *pErrorCode) { if (haveAliasData(pErrorCode) && isAlias(alias, pErrorCode)) { uint32_t listOffset = findTaggedAliasListsOffset(alias, standard, pErrorCode); if (0 < listOffset && listOffset < gMainTable.taggedAliasListsSize) { const uint16_t *currList = gMainTable.taggedAliasLists + listOffset + 1; /* Get the preferred name from this list */ if (currList[0]) { return GET_STRING(currList[0]); } /* else someone screwed up the alias table. */ /* *pErrorCode = U_INVALID_FORMAT_ERROR */ } } return nullptr; } U_CAPI uint16_t U_EXPORT2 ucnv_countAliases(const char *alias, UErrorCode *pErrorCode) { return ucnv_io_countAliases(alias, pErrorCode); } U_CAPI const char* U_EXPORT2 ucnv_getAlias(const char *alias, uint16_t n, UErrorCode *pErrorCode) { return ucnv_io_getAlias(alias, n, pErrorCode); } U_CAPI void U_EXPORT2 ucnv_getAliases(const char *alias, const char **aliases, UErrorCode *pErrorCode) { ucnv_io_getAliases(alias, 0, aliases, pErrorCode); } U_CAPI uint16_t U_EXPORT2 ucnv_countStandards() { UErrorCode err = U_ZERO_ERROR; return ucnv_io_countStandards(&err); } U_CAPI const char * U_EXPORT2 ucnv_getCanonicalName(const char *alias, const char *standard, UErrorCode *pErrorCode) { if (haveAliasData(pErrorCode) && isAlias(alias, pErrorCode)) { uint32_t convNum = findTaggedConverterNum(alias, standard, pErrorCode); if (convNum < gMainTable.converterListSize) { return GET_STRING(gMainTable.converterList[convNum]); } } return nullptr; } U_CDECL_BEGIN static int32_t U_CALLCONV ucnv_io_countAllConverters(UEnumeration * /*enumerator*/, UErrorCode * /*pErrorCode*/) { return gMainTable.converterListSize; } static const char * U_CALLCONV ucnv_io_nextAllConverters(UEnumeration *enumerator, int32_t* resultLength, UErrorCode * /*pErrorCode*/) { uint16_t *myContext = (uint16_t *)(enumerator->context); if (*myContext < gMainTable.converterListSize) { const char *myStr = GET_STRING(gMainTable.converterList[(*myContext)++]); if (resultLength) { *resultLength = (int32_t)uprv_strlen(myStr); } return myStr; } /* Either we accessed a zero length list, or we enumerated too far. */ if (resultLength) { *resultLength = 0; } return nullptr; } static void U_CALLCONV ucnv_io_resetAllConverters(UEnumeration *enumerator, UErrorCode * /*pErrorCode*/) { *((uint16_t *)(enumerator->context)) = 0; } U_CDECL_END static const UEnumeration gEnumAllConverters = { nullptr, nullptr, ucnv_io_closeUEnumeration, ucnv_io_countAllConverters, uenum_unextDefault, ucnv_io_nextAllConverters, ucnv_io_resetAllConverters }; U_CAPI UEnumeration * U_EXPORT2 ucnv_openAllNames(UErrorCode *pErrorCode) { UEnumeration *myEnum = nullptr; if (haveAliasData(pErrorCode)) { uint16_t *myContext; myEnum = static_cast<UEnumeration *>(uprv_malloc(sizeof(UEnumeration))); if (myEnum == nullptr) { *pErrorCode = U_MEMORY_ALLOCATION_ERROR; return nullptr; } uprv_memcpy(myEnum, &gEnumAllConverters, sizeof(UEnumeration)); myContext = static_cast<uint16_t *>(uprv_malloc(sizeof(uint16_t))); if (myContext == nullptr) { *pErrorCode = U_MEMORY_ALLOCATION_ERROR; uprv_free(myEnum); return nullptr; } *myContext = 0; myEnum->context = myContext; } return myEnum; } U_CAPI uint16_t ucnv_io_countKnownConverters(UErrorCode *pErrorCode) { if (haveAliasData(pErrorCode)) { return (uint16_t)gMainTable.converterListSize; } return 0; } /* alias table swapping ----------------------------------------------------- */ U_CDECL_BEGIN typedef char * U_CALLCONV StripForCompareFn(char *dst, const char *name); U_CDECL_END /* * row of a temporary array * * gets platform-endian charset string indexes and sorting indexes; * after sorting this array by strings, the actual arrays are permutated * according to the sorting indexes */ typedef struct TempRow { uint16_t strIndex, sortIndex; } TempRow; typedef struct TempAliasTable { const char *chars; TempRow *rows; uint16_t *resort; StripForCompareFn *stripForCompare; } TempAliasTable; enum { STACK_ROW_CAPACITY=500 }; static int32_t U_CALLCONV io_compareRows(const void *context, const void *left, const void *right) { char strippedLeft[UCNV_MAX_CONVERTER_NAME_LENGTH], strippedRight[UCNV_MAX_CONVERTER_NAME_LENGTH]; TempAliasTable *tempTable=(TempAliasTable *)context; const char *chars=tempTable->chars; return (int32_t)uprv_strcmp(tempTable->stripForCompare(strippedLeft, chars+2*((const TempRow *)left)->strIndex), tempTable->stripForCompare(strippedRight, chars+2*((const TempRow *)right)->strIndex)); } U_CAPI int32_t U_EXPORT2 ucnv_swapAliases(const UDataSwapper *ds, const void *inData, int32_t length, void *outData, UErrorCode *pErrorCode) { const UDataInfo *pInfo; int32_t headerSize; const uint16_t *inTable; const uint32_t *inSectionSizes; uint32_t toc[offsetsCount]; uint32_t offsets[offsetsCount]; /* 16-bit-addressed offsets from inTable/outTable */ uint32_t i, count, tocLength, topOffset; TempRow rows[STACK_ROW_CAPACITY]; uint16_t resort[STACK_ROW_CAPACITY]; TempAliasTable tempTable; /* udata_swapDataHeader checks the arguments */ headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode); if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) { return 0; } /* check data format and format version */ pInfo=(const UDataInfo *)((const char *)inData+4); if(!( pInfo->dataFormat[0]==0x43 && /* dataFormat="CvAl" */ pInfo->dataFormat[1]==0x76 && pInfo->dataFormat[2]==0x41 && pInfo->dataFormat[3]==0x6c && pInfo->formatVersion[0]==3 )) { udata_printError(ds, "ucnv_swapAliases(): data format %02x.%02x.%02x.%02x (format version %02x) is not an alias table\n", pInfo->dataFormat[0], pInfo->dataFormat[1], pInfo->dataFormat[2], pInfo->dataFormat[3], pInfo->formatVersion[0]); *pErrorCode=U_UNSUPPORTED_ERROR; return 0; } /* an alias table must contain at least the table of contents array */ if(length>=0 && (length-headerSize)<4*(1+minTocLength)) { udata_printError(ds, "ucnv_swapAliases(): too few bytes (%d after header) for an alias table\n", length-headerSize); *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR; return 0; } inSectionSizes=(const uint32_t *)((const char *)inData+headerSize); inTable=(const uint16_t *)inSectionSizes; uprv_memset(toc, 0, sizeof(toc)); toc[tocLengthIndex]=tocLength=ds->readUInt32(inSectionSizes[tocLengthIndex]); if(tocLength<minTocLength || offsetsCount<=tocLength) { udata_printError(ds, "ucnv_swapAliases(): table of contents contains unsupported number of sections (%u sections)\n", tocLength); *pErrorCode=U_INVALID_FORMAT_ERROR; return 0; } /* read the known part of the table of contents */ for(i=converterListIndex; i<=tocLength; ++i) { toc[i]=ds->readUInt32(inSectionSizes[i]); } /* compute offsets */ uprv_memset(offsets, 0, sizeof(offsets)); offsets[converterListIndex]=2*(1+tocLength); /* count two 16-bit units per toc entry */ for(i=tagListIndex; i<=tocLength; ++i) { offsets[i]=offsets[i-1]+toc[i-1]; } /* compute the overall size of the after-header data, in numbers of 16-bit units */ topOffset=offsets[i-1]+toc[i-1]; if(length>=0) { uint16_t *outTable; const uint16_t *p, *p2; uint16_t *q, *q2; uint16_t oldIndex; if((length-headerSize)<(2*(int32_t)topOffset)) { udata_printError(ds, "ucnv_swapAliases(): too few bytes (%d after header) for an alias table\n", length-headerSize); *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR; return 0; } outTable=(uint16_t *)((char *)outData+headerSize); /* swap the entire table of contents */ ds->swapArray32(ds, inTable, 4*(1+tocLength), outTable, pErrorCode); /* swap unormalized strings & normalized strings */ ds->swapInvChars(ds, inTable+offsets[stringTableIndex], 2*(int32_t)(toc[stringTableIndex]+toc[normalizedStringTableIndex]), outTable+offsets[stringTableIndex], pErrorCode); if(U_FAILURE(*pErrorCode)) { udata_printError(ds, "ucnv_swapAliases().swapInvChars(charset names) failed\n"); return 0; } if(ds->inCharset==ds->outCharset) { /* no need to sort, just swap all 16-bit values together */ ds->swapArray16(ds, inTable+offsets[converterListIndex], 2*(int32_t)(offsets[stringTableIndex]-offsets[converterListIndex]), outTable+offsets[converterListIndex], pErrorCode); } else { /* allocate the temporary table for sorting */ count=toc[aliasListIndex]; tempTable.chars=(const char *)(outTable+offsets[stringTableIndex]); /* sort by outCharset */ if(count<=STACK_ROW_CAPACITY) { tempTable.rows=rows; tempTable.resort=resort; } else { tempTable.rows=(TempRow *)uprv_malloc(count*sizeof(TempRow)+count*2); if(tempTable.rows==nullptr) { udata_printError(ds, "ucnv_swapAliases(): unable to allocate memory for sorting tables (max length: %u)\n", count); *pErrorCode=U_MEMORY_ALLOCATION_ERROR; return 0; } tempTable.resort=(uint16_t *)(tempTable.rows+count); } if(ds->outCharset==U_ASCII_FAMILY) { tempTable.stripForCompare=ucnv_io_stripASCIIForCompare; } else /* U_EBCDIC_FAMILY */ { tempTable.stripForCompare=ucnv_io_stripEBCDICForCompare; } /* * Sort unique aliases+mapped names. * * We need to sort the list again by outCharset strings because they * sort differently for different charset families. * First we set up a temporary table with the string indexes and * sorting indexes and sort that. * Then we permutate and copy/swap the actual values. */ p=inTable+offsets[aliasListIndex]; q=outTable+offsets[aliasListIndex]; p2=inTable+offsets[untaggedConvArrayIndex]; q2=outTable+offsets[untaggedConvArrayIndex]; for(i=0; i<count; ++i) { tempTable.rows[i].strIndex=ds->readUInt16(p[i]); tempTable.rows[i].sortIndex=(uint16_t)i; } uprv_sortArray(tempTable.rows, (int32_t)count, sizeof(TempRow), io_compareRows, &tempTable, false, pErrorCode); if(U_SUCCESS(*pErrorCode)) { /* copy/swap/permutate items */ if(p!=q) { for(i=0; i<count; ++i) { oldIndex=tempTable.rows[i].sortIndex; ds->swapArray16(ds, p+oldIndex, 2, q+i, pErrorCode); ds->swapArray16(ds, p2+oldIndex, 2, q2+i, pErrorCode); } } else { /* * If we swap in-place, then the permutation must use another * temporary array (tempTable.resort) * before the results are copied to the outBundle. */ uint16_t *r=tempTable.resort; for(i=0; i<count; ++i) { oldIndex=tempTable.rows[i].sortIndex; ds->swapArray16(ds, p+oldIndex, 2, r+i, pErrorCode); } uprv_memcpy(q, r, 2*(size_t)count); for(i=0; i<count; ++i) { oldIndex=tempTable.rows[i].sortIndex; ds->swapArray16(ds, p2+oldIndex, 2, r+i, pErrorCode); } uprv_memcpy(q2, r, 2*(size_t)count); } } if(tempTable.rows!=rows) { uprv_free(tempTable.rows); } if(U_FAILURE(*pErrorCode)) { udata_printError(ds, "ucnv_swapAliases().uprv_sortArray(%u items) failed\n", count); return 0; } /* swap remaining 16-bit values */ ds->swapArray16(ds, inTable+offsets[converterListIndex], 2*(int32_t)(offsets[aliasListIndex]-offsets[converterListIndex]), outTable+offsets[converterListIndex], pErrorCode); ds->swapArray16(ds, inTable+offsets[taggedAliasArrayIndex], 2*(int32_t)(offsets[stringTableIndex]-offsets[taggedAliasArrayIndex]), outTable+offsets[taggedAliasArrayIndex], pErrorCode); } } return headerSize+2*(int32_t)topOffset; } #endif /* * Hey, Emacs, please set the following: * * Local Variables: * indent-tabs-mode: nil * End: * */
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