Check in the pristine copy of ICU 4.6...

icu46/source/common/ucnv_io.c

+/*
+******************************************************************************
+*
+*   Copyright (C) 1999-2008, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*
+*
+*  ucnv_io.c:
+*  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 "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;
+
+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;
+    }
+
+    uprv_memset(&gMainTable, 0, sizeof(gMainTable));
+
+    return TRUE;                   /* Everything was cleaned up */
+}
+
+static UBool
+haveAliasData(UErrorCode *pErrorCode) {
+    int needInit;
+
+    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
+        return FALSE;
+    }
+
+    UMTX_CHECK(NULL, (gAliasData==NULL), needInit);
+
+    /* load converter alias data from file if necessary */
+    if (needInit) {
+        UDataMemory *data;
+        const uint16_t *table;
+        const uint32_t *sectionSizes;
+        uint32_t tableStart;
+        uint32_t currOffset;
+
+        data = udata_openChoice(NULL, DATA_TYPE, DATA_NAME, isAcceptable, NULL, pErrorCode);
+        if(U_FAILURE(*pErrorCode)) {
+            return FALSE;
+        }
+
+        sectionSizes = (const uint32_t *)udata_getMemory(data);
+        table = (const uint16_t *)sectionSizes;
+
+        tableStart      = sectionSizes[0];
+        if (tableStart < minTocLength) {
+            *pErrorCode = U_INVALID_FORMAT_ERROR;
+            udata_close(data);
+            return FALSE;
+        }
+
+        umtx_lock(NULL);
+        if(gAliasData==NULL) {
+            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));
+
+            ucln_common_registerCleanup(UCLN_COMMON_UCNV_IO, ucnv_io_cleanup);
+
+            gAliasData = data;
+            data=NULL;
+        }
+        umtx_unlock(NULL);
+
+        /* if a different thread set it first, then close the extra data */
+        if(data!=NULL) {
+            udata_close(data); /* NULL if it was set correctly */
+        }
+    }
+
+    return TRUE;
+}
+
+static U_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 {
+    IGNORE,
+    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)IGNORE)
+
+/* 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)IGNORE)
+
+#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 IGNORE:
+            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 IGNORE:
+            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 IGNORE:
+                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 IGNORE:
+                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 U_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 U_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) {
+    if(haveAliasData(pErrorCode) && isAlias(alias, pErrorCode)) {
+        uint32_t convNum = findConverter(alias, containsOption, pErrorCode);
+        if (convNum < gMainTable.converterListSize) {
+            return GET_STRING(gMainTable.converterList[convNum]);
+        }
+        /* else converter not found */
+    }
+    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 = uprv_malloc(sizeof(UEnumeration));
+            if (myEnum == NULL) {
+                *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
+                return NULL;
+            }
+            uprv_memcpy(myEnum, &gEnumAliases, sizeof(UEnumeration));
+            myContext = 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 = uprv_malloc(sizeof(UEnumeration));
+        if (myEnum == NULL) {
+            *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
+            return NULL;
+        }
+        uprv_memcpy(myEnum, &gEnumAllConverters, sizeof(UEnumeration));
+        myContext = 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:
+ *
+ */