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Diffstat (limited to 'deps/icu-small/source/common/ucnv_io.cpp')
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diff --git a/deps/icu-small/source/common/ucnv_io.cpp b/deps/icu-small/source/common/ucnv_io.cpp new file mode 100644 index 0000000000..50ffd5843d --- /dev/null +++ b/deps/icu-small/source/common/ucnv_io.cpp @@ -0,0 +1,1347 @@ +/* +****************************************************************************** +* +* 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=NULL; +static icu::UInitOnce gAliasDataInitOnce = U_INITONCE_INITIALIZER; + +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(idx) (const char *)(gMainTable.stringTable + (idx)) +#define GET_NORMALIZED_STRING(idx) (const char *)(gMainTable.normalizedStringTable + (idx)) + +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(void) +{ + if (gAliasData) { + udata_close(gAliasData); + gAliasData = NULL; + } + 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 == NULL); + data = udata_openChoice(NULL, DATA_TYPE, DATA_NAME, isAcceptable, NULL, &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==NULL) { + *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(c) ((int8_t)(c) >= 0 ? asciiTypes[(uint8_t)c] : (uint8_t)UIGNORE) + +/* 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(c) ((int8_t)(c) < 0 ? ebcdicTypes[(c)&0x7f] : (uint8_t)UIGNORE) + +#if U_CHARSET_FAMILY==U_ASCII_FAMILY +# define GET_CHAR_TYPE(c) GET_ASCII_TYPE(c) +#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY +# define GET_CHAR_TYPE(c) GET_EBCDIC_TYPE(c) +#else +# error U_CHARSET_FAMILY is not valid +#endif + +/* @see ucnv_compareNames */ +U_CFUNC char * U_EXPORT2 +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_CFUNC char * U_EXPORT2 +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-NULL. + */ +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, NULL, &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, NULL, &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_CFUNC 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 NULL; +} + +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 NULL; +} + +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); +} + +/* Enumerate the aliases for the specified converter and standard tag */ +static const UEnumeration gEnumAliases = { + NULL, + NULL, + 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 = NULL; + 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 == NULL) { + *pErrorCode = U_MEMORY_ALLOCATION_ERROR; + return NULL; + } + uprv_memcpy(myEnum, &gEnumAliases, sizeof(UEnumeration)); + myContext = static_cast<UAliasContext *>(uprv_malloc(sizeof(UAliasContext))); + if (myContext == NULL) { + *pErrorCode = U_MEMORY_ALLOCATION_ERROR; + uprv_free(myEnum); + return NULL; + } + 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, NULL, 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, NULL, 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, NULL, 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 NULL; +} + +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 NULL; +} + +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 NULL; +} + +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(void) +{ + 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 NULL; +} + +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 NULL; +} + +static void U_CALLCONV +ucnv_io_resetAllConverters(UEnumeration *enumerator, UErrorCode * /*pErrorCode*/) { + *((uint16_t *)(enumerator->context)) = 0; +} + +static const UEnumeration gEnumAllConverters = { + NULL, + NULL, + 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 = NULL; + if (haveAliasData(pErrorCode)) { + uint16_t *myContext; + + myEnum = static_cast<UEnumeration *>(uprv_malloc(sizeof(UEnumeration))); + if (myEnum == NULL) { + *pErrorCode = U_MEMORY_ALLOCATION_ERROR; + return NULL; + } + uprv_memcpy(myEnum, &gEnumAllConverters, sizeof(UEnumeration)); + myContext = static_cast<uint16_t *>(uprv_malloc(sizeof(uint16_t))); + if (myContext == NULL) { + *pErrorCode = U_MEMORY_ALLOCATION_ERROR; + uprv_free(myEnum); + return NULL; + } + *myContext = 0; + myEnum->context = myContext; + } + return myEnum; +} + +U_CFUNC uint16_t +ucnv_io_countKnownConverters(UErrorCode *pErrorCode) { + if (haveAliasData(pErrorCode)) { + return (uint16_t)gMainTable.converterListSize; + } + return 0; +} + +/* alias table swapping ----------------------------------------------------- */ + +typedef char * U_CALLCONV StripForCompareFn(char *dst, const char *name); + +/* + * 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 +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==NULL || 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==NULL) { + 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*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*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: + * + */ |