[apple/icu.git] / icuSources / tools / toolutil / swapimpl.cpp

/*
*******************************************************************************
*
*   Copyright (C) 2005-2006, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  swapimpl.cpp
*   encoding:   US-ASCII
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2005may05
*   created by: Markus W. Scherer
*
*   Data file swapping functions moved here from the common library
*   because some data is hardcoded in ICU4C and needs not be swapped any more.
*   Moving the functions here simplifies testing (for code coverage) because
*   we need not jump through hoops (like adding snapshots of these files
*   to testdata).
*
*   The declarations for these functions remain in the internal header files
*   in icu/source/common/
*/

#include "unicode/utypes.h"
#include "unicode/putil.h"
#include "unicode/udata.h"
#include "cmemory.h"
#include "cstring.h"
#include "uinvchar.h"
#include "uassert.h"
#include "uarrsort.h"
#include "ucmndata.h"
#include "udataswp.h"

/* swapping implementations in common */

#include "uresdata.h"
#include "ucnv_io.h"
#include "uprops.h"
#include "ucase.h"
#include "ubidi_props.h"
#include "ucol_swp.h"
#include "ucnv_bld.h"
#include "unormimp.h"
#include "sprpimpl.h"
#include "propname.h"
#include "rbbidata.h"
#include "triedict.h"

/* swapping implementations in i18n */

/* definitions */

#define LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0]))

/* Unicode properties data swapping ----------------------------------------- */

U_CAPI int32_t U_EXPORT2
uprops_swap(const UDataSwapper *ds,
            const void *inData, int32_t length, void *outData,
            UErrorCode *pErrorCode) {
    const UDataInfo *pInfo;
    int32_t headerSize, i;

    int32_t dataIndexes[UPROPS_INDEX_COUNT];
    const int32_t *inData32;

    /* 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]==0x55 &&   /* dataFormat="UPro" */
        pInfo->dataFormat[1]==0x50 &&
        pInfo->dataFormat[2]==0x72 &&
        pInfo->dataFormat[3]==0x6f &&
        (pInfo->formatVersion[0]==3 || pInfo->formatVersion[0]==4) &&
        pInfo->formatVersion[2]==UTRIE_SHIFT &&
        pInfo->formatVersion[3]==UTRIE_INDEX_SHIFT
    )) {
        udata_printError(ds, "uprops_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not a Unicode properties file\n",
                         pInfo->dataFormat[0], pInfo->dataFormat[1],
                         pInfo->dataFormat[2], pInfo->dataFormat[3],
                         pInfo->formatVersion[0]);
        *pErrorCode=U_UNSUPPORTED_ERROR;
        return 0;
    }

    /* the properties file must contain at least the indexes array */
    if(length>=0 && (length-headerSize)<(int32_t)sizeof(dataIndexes)) {
        udata_printError(ds, "uprops_swap(): too few bytes (%d after header) for a Unicode properties file\n",
                         length-headerSize);
        *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
        return 0;
    }

    /* read the indexes */
    inData32=(const int32_t *)((const char *)inData+headerSize);
    for(i=0; i<UPROPS_INDEX_COUNT; ++i) {
        dataIndexes[i]=udata_readInt32(ds, inData32[i]);
    }

    /*
     * comments are copied from the data format description in genprops/store.c
     * indexes[] constants are in uprops.h
     */
    if(length>=0) {
        int32_t *outData32;

        if((length-headerSize)<(4*dataIndexes[UPROPS_RESERVED_INDEX])) {
            udata_printError(ds, "uprops_swap(): too few bytes (%d after header) for a Unicode properties file\n",
                             length-headerSize);
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }

        outData32=(int32_t *)((char *)outData+headerSize);

        /* copy everything for inaccessible data (padding) */
        if(inData32!=outData32) {
            uprv_memcpy(outData32, inData32, 4*dataIndexes[UPROPS_RESERVED_INDEX]);
        }

        /* swap the indexes[16] */
        ds->swapArray32(ds, inData32, 4*UPROPS_INDEX_COUNT, outData32, pErrorCode);

        /*
         * swap the main properties UTrie
         * PT serialized properties trie, see utrie.h (byte size: 4*(i0-16))
         */
        utrie_swap(ds,
            inData32+UPROPS_INDEX_COUNT,
            4*(dataIndexes[UPROPS_PROPS32_INDEX]-UPROPS_INDEX_COUNT),
            outData32+UPROPS_INDEX_COUNT,
            pErrorCode);

        /*
         * swap the properties and exceptions words
         * P  const uint32_t props32[i1-i0];
         * E  const uint32_t exceptions[i2-i1];
         */
        ds->swapArray32(ds,
            inData32+dataIndexes[UPROPS_PROPS32_INDEX],
            4*(dataIndexes[UPROPS_EXCEPTIONS_TOP_INDEX]-dataIndexes[UPROPS_PROPS32_INDEX]),
            outData32+dataIndexes[UPROPS_PROPS32_INDEX],
            pErrorCode);

        /*
         * swap the UChars
         * U  const UChar uchars[2*(i3-i2)];
         */
        ds->swapArray16(ds,
            inData32+dataIndexes[UPROPS_EXCEPTIONS_TOP_INDEX],
            4*(dataIndexes[UPROPS_ADDITIONAL_TRIE_INDEX]-dataIndexes[UPROPS_EXCEPTIONS_TOP_INDEX]),
            outData32+dataIndexes[UPROPS_EXCEPTIONS_TOP_INDEX],
            pErrorCode);

        /*
         * swap the additional UTrie
         * i3 additionalTrieIndex; -- 32-bit unit index to the additional trie for more properties
         */
        utrie_swap(ds,
            inData32+dataIndexes[UPROPS_ADDITIONAL_TRIE_INDEX],
            4*(dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX]-dataIndexes[UPROPS_ADDITIONAL_TRIE_INDEX]),
            outData32+dataIndexes[UPROPS_ADDITIONAL_TRIE_INDEX],
            pErrorCode);

        /*
         * swap the properties vectors
         * PV const uint32_t propsVectors[(i6-i4)/i5][i5]==uint32_t propsVectors[i6-i4];
         */
        ds->swapArray32(ds,
            inData32+dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX],
            4*(dataIndexes[UPROPS_RESERVED_INDEX]-dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX]),
            outData32+dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX],
            pErrorCode);
    }

    /* i6 reservedItemIndex; -- 32-bit unit index to the top of the properties vectors table */
    return headerSize+4*dataIndexes[UPROPS_RESERVED_INDEX];
}

/* Unicode case mapping data swapping --------------------------------------- */

U_CAPI int32_t U_EXPORT2
ucase_swap(const UDataSwapper *ds,
           const void *inData, int32_t length, void *outData,
           UErrorCode *pErrorCode) {
    const UDataInfo *pInfo;
    int32_t headerSize;

    const uint8_t *inBytes;
    uint8_t *outBytes;

    const int32_t *inIndexes;
    int32_t indexes[16];

    int32_t i, offset, count, size;

    /* 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]==UCASE_FMT_0 &&    /* dataFormat="cAsE" */
        pInfo->dataFormat[1]==UCASE_FMT_1 &&
        pInfo->dataFormat[2]==UCASE_FMT_2 &&
        pInfo->dataFormat[3]==UCASE_FMT_3 &&
        pInfo->formatVersion[0]==1 &&
        pInfo->formatVersion[2]==UTRIE_SHIFT &&
        pInfo->formatVersion[3]==UTRIE_INDEX_SHIFT
    )) {
        udata_printError(ds, "ucase_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized as case mapping data\n",
                         pInfo->dataFormat[0], pInfo->dataFormat[1],
                         pInfo->dataFormat[2], pInfo->dataFormat[3],
                         pInfo->formatVersion[0]);
        *pErrorCode=U_UNSUPPORTED_ERROR;
        return 0;
    }

    inBytes=(const uint8_t *)inData+headerSize;
    outBytes=(uint8_t *)outData+headerSize;

    inIndexes=(const int32_t *)inBytes;

    if(length>=0) {
        length-=headerSize;
        if(length<16*4) {
            udata_printError(ds, "ucase_swap(): too few bytes (%d after header) for case mapping data\n",
                             length);
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }
    }

    /* read the first 16 indexes (ICU 3.2/format version 1: UCASE_IX_TOP==16, might grow) */
    for(i=0; i<16; ++i) {
        indexes[i]=udata_readInt32(ds, inIndexes[i]);
    }

    /* get the total length of the data */
    size=indexes[UCASE_IX_LENGTH];

    if(length>=0) {
        if(length<size) {
            udata_printError(ds, "ucase_swap(): too few bytes (%d after header) for all of case mapping data\n",
                             length);
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }

        /* copy the data for inaccessible bytes */
        if(inBytes!=outBytes) {
            uprv_memcpy(outBytes, inBytes, size);
        }

        offset=0;

        /* swap the int32_t indexes[] */
        count=indexes[UCASE_IX_INDEX_TOP]*4;
        ds->swapArray32(ds, inBytes, count, outBytes, pErrorCode);
        offset+=count;

        /* swap the UTrie */
        count=indexes[UCASE_IX_TRIE_SIZE];
        utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
        offset+=count;

        /* swap the uint16_t exceptions[] and unfold[] */
        count=(indexes[UCASE_IX_EXC_LENGTH]+indexes[UCASE_IX_UNFOLD_LENGTH])*2;
        ds->swapArray16(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
        offset+=count;

        U_ASSERT(offset==size);
    }

    return headerSize+size;
}

/* Unicode bidi/shaping data swapping --------------------------------------- */

U_CAPI int32_t U_EXPORT2
ubidi_swap(const UDataSwapper *ds,
           const void *inData, int32_t length, void *outData,
           UErrorCode *pErrorCode) {
    const UDataInfo *pInfo;
    int32_t headerSize;

    const uint8_t *inBytes;
    uint8_t *outBytes;

    const int32_t *inIndexes;
    int32_t indexes[16];

    int32_t i, offset, count, size;

    /* 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]==UBIDI_FMT_0 &&    /* dataFormat="BiDi" */
        pInfo->dataFormat[1]==UBIDI_FMT_1 &&
        pInfo->dataFormat[2]==UBIDI_FMT_2 &&
        pInfo->dataFormat[3]==UBIDI_FMT_3 &&
        pInfo->formatVersion[0]==1 &&
        pInfo->formatVersion[2]==UTRIE_SHIFT &&
        pInfo->formatVersion[3]==UTRIE_INDEX_SHIFT
    )) {
        udata_printError(ds, "ubidi_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized as bidi/shaping data\n",
                         pInfo->dataFormat[0], pInfo->dataFormat[1],
                         pInfo->dataFormat[2], pInfo->dataFormat[3],
                         pInfo->formatVersion[0]);
        *pErrorCode=U_UNSUPPORTED_ERROR;
        return 0;
    }

    inBytes=(const uint8_t *)inData+headerSize;
    outBytes=(uint8_t *)outData+headerSize;

    inIndexes=(const int32_t *)inBytes;

    if(length>=0) {
        length-=headerSize;
        if(length<16*4) {
            udata_printError(ds, "ubidi_swap(): too few bytes (%d after header) for bidi/shaping data\n",
                             length);
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }
    }

    /* read the first 16 indexes (ICU 3.4/format version 1: UBIDI_IX_TOP==16, might grow) */
    for(i=0; i<16; ++i) {
        indexes[i]=udata_readInt32(ds, inIndexes[i]);
    }

    /* get the total length of the data */
    size=indexes[UBIDI_IX_LENGTH];

    if(length>=0) {
        if(length<size) {
            udata_printError(ds, "ubidi_swap(): too few bytes (%d after header) for all of bidi/shaping data\n",
                             length);
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }

        /* copy the data for inaccessible bytes */
        if(inBytes!=outBytes) {
            uprv_memcpy(outBytes, inBytes, size);
        }

        offset=0;

        /* swap the int32_t indexes[] */
        count=indexes[UBIDI_IX_INDEX_TOP]*4;
        ds->swapArray32(ds, inBytes, count, outBytes, pErrorCode);
        offset+=count;

        /* swap the UTrie */
        count=indexes[UBIDI_IX_TRIE_SIZE];
        utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
        offset+=count;

        /* swap the uint32_t mirrors[] */
        count=indexes[UBIDI_IX_MIRROR_LENGTH]*4;
        ds->swapArray32(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
        offset+=count;

        /* just skip the uint8_t jgArray[] */
        count=indexes[UBIDI_IX_JG_LIMIT]-indexes[UBIDI_IX_JG_START];
        offset+=count;

        U_ASSERT(offset==size);
    }

    return headerSize+size;
}

/* Unicode normalization data swapping -------------------------------------- */

#if !UCONFIG_NO_NORMALIZATION

U_CAPI int32_t U_EXPORT2
unorm_swap(const UDataSwapper *ds,
           const void *inData, int32_t length, void *outData,
           UErrorCode *pErrorCode) {
    const UDataInfo *pInfo;
    int32_t headerSize;

    const uint8_t *inBytes;
    uint8_t *outBytes;

    const int32_t *inIndexes;
    int32_t indexes[32];

    int32_t i, offset, count, size;

    /* 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]==0x4e &&   /* dataFormat="Norm" */
        pInfo->dataFormat[1]==0x6f &&
        pInfo->dataFormat[2]==0x72 &&
        pInfo->dataFormat[3]==0x6d &&
        pInfo->formatVersion[0]==2
    )) {
        udata_printError(ds, "unorm_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized as unorm.icu\n",
                         pInfo->dataFormat[0], pInfo->dataFormat[1],
                         pInfo->dataFormat[2], pInfo->dataFormat[3],
                         pInfo->formatVersion[0]);
        *pErrorCode=U_UNSUPPORTED_ERROR;
        return 0;
    }

    inBytes=(const uint8_t *)inData+headerSize;
    outBytes=(uint8_t *)outData+headerSize;

    inIndexes=(const int32_t *)inBytes;

    if(length>=0) {
        length-=headerSize;
        if(length<32*4) {
            udata_printError(ds, "unorm_swap(): too few bytes (%d after header) for unorm.icu\n",
                             length);
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }
    }

    /* read the first 32 indexes (ICU 2.8/format version 2.2: _NORM_INDEX_TOP==32, might grow) */
    for(i=0; i<32; ++i) {
        indexes[i]=udata_readInt32(ds, inIndexes[i]);
    }

    /* calculate the total length of the data */
    size=
        32*4+ /* size of indexes[] */
        indexes[_NORM_INDEX_TRIE_SIZE]+
        indexes[_NORM_INDEX_UCHAR_COUNT]*2+
        indexes[_NORM_INDEX_COMBINE_DATA_COUNT]*2+
        indexes[_NORM_INDEX_FCD_TRIE_SIZE]+
        indexes[_NORM_INDEX_AUX_TRIE_SIZE]+
        indexes[_NORM_INDEX_CANON_SET_COUNT]*2;

    if(length>=0) {
        if(length<size) {
            udata_printError(ds, "unorm_swap(): too few bytes (%d after header) for all of unorm.icu\n",
                             length);
            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
            return 0;
        }

        /* copy the data for inaccessible bytes */
        if(inBytes!=outBytes) {
            uprv_memcpy(outBytes, inBytes, size);
        }

        offset=0;

        /* swap the indexes[] */
        count=32*4;
        ds->swapArray32(ds, inBytes, count, outBytes, pErrorCode);
        offset+=count;

        /* swap the main UTrie */
        count=indexes[_NORM_INDEX_TRIE_SIZE];
        utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
        offset+=count;

        /* swap the uint16_t extraData[] and the uint16_t combiningTable[] */
        count=(indexes[_NORM_INDEX_UCHAR_COUNT]+indexes[_NORM_INDEX_COMBINE_DATA_COUNT])*2;
        ds->swapArray16(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
        offset+=count;

        /* swap the FCD UTrie */
        count=indexes[_NORM_INDEX_FCD_TRIE_SIZE];
        if(count!=0) {
            utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
            offset+=count;
        }

        /* swap the aux UTrie */
        count=indexes[_NORM_INDEX_AUX_TRIE_SIZE];
        if(count!=0) {
            utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
            offset+=count;
        }

        /* swap the uint16_t combiningTable[] */
        count=indexes[_NORM_INDEX_CANON_SET_COUNT]*2;
        ds->swapArray16(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
        offset+=count;
    }

    return headerSize+size;
}

#endif

/* swap any data (except a .dat package) ------------------------------------ */

static const struct {
    uint8_t dataFormat[4];
    UDataSwapFn *swapFn;
} swapFns[]={
    { { 0x52, 0x65, 0x73, 0x42 }, ures_swap },          /* dataFormat="ResB" */
#if !UCONFIG_NO_LEGACY_CONVERSION
    { { 0x63, 0x6e, 0x76, 0x74 }, ucnv_swap },          /* dataFormat="cnvt" */
#endif
#if !UCONFIG_NO_CONVERSION
    { { 0x43, 0x76, 0x41, 0x6c }, ucnv_swapAliases },   /* dataFormat="CvAl" */
#endif
#if !UCONFIG_NO_IDNA
    { { 0x53, 0x50, 0x52, 0x50 }, usprep_swap },        /* dataFormat="SPRP" */
#endif
    /* insert data formats here, descending by expected frequency of occurrence */
    { { 0x55, 0x50, 0x72, 0x6f }, uprops_swap },        /* dataFormat="UPro" */

    { { UCASE_FMT_0, UCASE_FMT_1, UCASE_FMT_2, UCASE_FMT_3 },
                                  ucase_swap },         /* dataFormat="cAsE" */

    { { UBIDI_FMT_0, UBIDI_FMT_1, UBIDI_FMT_2, UBIDI_FMT_3 },
                                  ubidi_swap },         /* dataFormat="BiDi" */

#if !UCONFIG_NO_NORMALIZATION
    { { 0x4e, 0x6f, 0x72, 0x6d }, unorm_swap },         /* dataFormat="Norm" */
#endif
#if !UCONFIG_NO_COLLATION
    { { 0x55, 0x43, 0x6f, 0x6c }, ucol_swap },          /* dataFormat="UCol" */
    { { 0x49, 0x6e, 0x76, 0x43 }, ucol_swapInverseUCA },/* dataFormat="InvC" */
#endif
#if !UCONFIG_NO_BREAK_ITERATION
    { { 0x42, 0x72, 0x6b, 0x20 }, ubrk_swap },          /* dataFormat="Brk " */
    { { 0x54, 0x72, 0x44, 0x63 }, triedict_swap },      /* dataFormat="TrDc " */
#endif
    { { 0x70, 0x6e, 0x61, 0x6d }, upname_swap },        /* dataFormat="pnam" */
    { { 0x75, 0x6e, 0x61, 0x6d }, uchar_swapNames }     /* dataFormat="unam" */
};

U_CAPI int32_t U_EXPORT2
udata_swap(const UDataSwapper *ds,
           const void *inData, int32_t length, void *outData,
           UErrorCode *pErrorCode) {
    char dataFormatChars[4];
    const UDataInfo *pInfo;
    int32_t headerSize, i, swappedLength;

    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
        return 0;
    }

    /*
     * Preflight the header first; checks for illegal arguments, too.
     * Do not swap the header right away because the format-specific swapper
     * will swap it, get the headerSize again, and also use the header
     * information. Otherwise we would have to pass some of the information
     * and not be able to use the UDataSwapFn signature.
     */
    headerSize=udata_swapDataHeader(ds, inData, -1, NULL, pErrorCode);

    /*
     * If we wanted udata_swap() to also handle non-loadable data like a UTrie,
     * then we could check here for further known magic values and structures.
     */
    if(U_FAILURE(*pErrorCode)) {
        return 0; /* the data format was not recognized */
    }

    pInfo=(const UDataInfo *)((const char *)inData+4);

    {
        /* convert the data format from ASCII to Unicode to the system charset */
        UChar u[4]={
             pInfo->dataFormat[0], pInfo->dataFormat[1],
             pInfo->dataFormat[2], pInfo->dataFormat[3]
        };

        if(uprv_isInvariantUString(u, 4)) {
            u_UCharsToChars(u, dataFormatChars, 4);
        } else {
            dataFormatChars[0]=dataFormatChars[1]=dataFormatChars[2]=dataFormatChars[3]='?';
        }
    }

    /* dispatch to the swap function for the dataFormat */
    for(i=0; i<LENGTHOF(swapFns); ++i) {
        if(0==memcmp(swapFns[i].dataFormat, pInfo->dataFormat, 4)) {
            swappedLength=swapFns[i].swapFn(ds, inData, length, outData, pErrorCode);

            if(U_FAILURE(*pErrorCode)) {
                udata_printError(ds, "udata_swap(): failure swapping data format %02x.%02x.%02x.%02x (\"%c%c%c%c\") - %s\n",
                                 pInfo->dataFormat[0], pInfo->dataFormat[1],
                                 pInfo->dataFormat[2], pInfo->dataFormat[3],
                                 dataFormatChars[0], dataFormatChars[1],
                                 dataFormatChars[2], dataFormatChars[3],
                                 u_errorName(*pErrorCode));
            } else if(swappedLength<(length-15)) {
                /* swapped less than expected */
                udata_printError(ds, "udata_swap() warning: swapped only %d out of %d bytes - data format %02x.%02x.%02x.%02x (\"%c%c%c%c\")\n",
                                 swappedLength, length,
                                 pInfo->dataFormat[0], pInfo->dataFormat[1],
                                 pInfo->dataFormat[2], pInfo->dataFormat[3],
                                 dataFormatChars[0], dataFormatChars[1],
                                 dataFormatChars[2], dataFormatChars[3],
                                 u_errorName(*pErrorCode));
            }

            return swappedLength;
        }
    }

    /* the dataFormat was not recognized */
    udata_printError(ds, "udata_swap(): unknown data format %02x.%02x.%02x.%02x (\"%c%c%c%c\")\n",
                     pInfo->dataFormat[0], pInfo->dataFormat[1],
                     pInfo->dataFormat[2], pInfo->dataFormat[3],
                     dataFormatChars[0], dataFormatChars[1],
                     dataFormatChars[2], dataFormatChars[3]);

    *pErrorCode=U_UNSUPPORTED_ERROR;
    return 0;
}
Commit	Line	Data
73c04bcf A	1	/*
	2	*******************************************************************************
	3	*
	4	* Copyright (C) 2005-2006, International Business Machines
	5	* Corporation and others. All Rights Reserved.
	6	*
	7	*******************************************************************************
	8	* file name: swapimpl.cpp
	9	* encoding: US-ASCII
	10	* tab size: 8 (not used)
	11	* indentation:4
	12	*
	13	* created on: 2005may05
	14	* created by: Markus W. Scherer
	15	*
	16	* Data file swapping functions moved here from the common library
	17	* because some data is hardcoded in ICU4C and needs not be swapped any more.
	18	* Moving the functions here simplifies testing (for code coverage) because
	19	* we need not jump through hoops (like adding snapshots of these files
	20	* to testdata).
	21	*
	22	* The declarations for these functions remain in the internal header files
	23	* in icu/source/common/
	24	*/
	25
	26	#include "unicode/utypes.h"
	27	#include "unicode/putil.h"
	28	#include "unicode/udata.h"
	29	#include "cmemory.h"
	30	#include "cstring.h"
	31	#include "uinvchar.h"
	32	#include "uassert.h"
	33	#include "uarrsort.h"
	34	#include "ucmndata.h"
	35	#include "udataswp.h"
	36
	37	/* swapping implementations in common */
	38
	39	#include "uresdata.h"
	40	#include "ucnv_io.h"
	41	#include "uprops.h"
	42	#include "ucase.h"
	43	#include "ubidi_props.h"
	44	#include "ucol_swp.h"
	45	#include "ucnv_bld.h"
	46	#include "unormimp.h"
	47	#include "sprpimpl.h"
	48	#include "propname.h"
	49	#include "rbbidata.h"
	50	#include "triedict.h"
	51
	52	/* swapping implementations in i18n */
	53
	54	/* definitions */
	55
	56	#define LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0]))
	57
	58	/* Unicode properties data swapping ----------------------------------------- */
	59
	60	U_CAPI int32_t U_EXPORT2
	61	uprops_swap(const UDataSwapper *ds,
	62	const void inData, int32_t length, void outData,
	63	UErrorCode *pErrorCode) {
	64	const UDataInfo *pInfo;
65	int32_t headerSize, i;
66
67	int32_t dataIndexes[UPROPS_INDEX_COUNT];
68	const int32_t *inData32;
69
70	/* udata_swapDataHeader checks the arguments */
71	headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode);
72	if(pErrorCode==NULL \|\| U_FAILURE(*pErrorCode)) {
73	return 0;
74	}
75
76	/* check data format and format version */
77	pInfo=(const UDataInfo )((const char )inData+4);
78	if(!(
79	pInfo->dataFormat[0]==0x55 && /* dataFormat="UPro" */
80	pInfo->dataFormat[1]==0x50 &&
81	pInfo->dataFormat[2]==0x72 &&
82	pInfo->dataFormat[3]==0x6f &&
83	(pInfo->formatVersion[0]==3 \|\| pInfo->formatVersion[0]==4) &&
84	pInfo->formatVersion[2]==UTRIE_SHIFT &&
85	pInfo->formatVersion[3]==UTRIE_INDEX_SHIFT
86	)) {
87	udata_printError(ds, "uprops_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not a Unicode properties file\n",
88	pInfo->dataFormat[0], pInfo->dataFormat[1],
89	pInfo->dataFormat[2], pInfo->dataFormat[3],
90	pInfo->formatVersion[0]);
91	*pErrorCode=U_UNSUPPORTED_ERROR;
92	return 0;
93	}
94
95	/* the properties file must contain at least the indexes array */
96	if(length>=0 && (length-headerSize)<(int32_t)sizeof(dataIndexes)) {
97	udata_printError(ds, "uprops_swap(): too few bytes (%d after header) for a Unicode properties file\n",
98	length-headerSize);
99	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
100	return 0;
101	}
102
103	/* read the indexes */
104	inData32=(const int32_t )((const char )inData+headerSize);
105	for(i=0; i<UPROPS_INDEX_COUNT; ++i) {
106	dataIndexes[i]=udata_readInt32(ds, inData32[i]);
107	}
108
109	/*
110	* comments are copied from the data format description in genprops/store.c
111	* indexes[] constants are in uprops.h
112	*/
113	if(length>=0) {
114	int32_t *outData32;
115
116	if((length-headerSize)<(4*dataIndexes[UPROPS_RESERVED_INDEX])) {
117	udata_printError(ds, "uprops_swap(): too few bytes (%d after header) for a Unicode properties file\n",
118	length-headerSize);
119	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
120	return 0;
121	}
122
123	outData32=(int32_t )((char )outData+headerSize);
124
125	/* copy everything for inaccessible data (padding) */
126	if(inData32!=outData32) {
127	uprv_memcpy(outData32, inData32, 4*dataIndexes[UPROPS_RESERVED_INDEX]);
128	}
129
130	/* swap the indexes[16] */
131	ds->swapArray32(ds, inData32, 4*UPROPS_INDEX_COUNT, outData32, pErrorCode);
132
133	/*
134	* swap the main properties UTrie
135	* PT serialized properties trie, see utrie.h (byte size: 4*(i0-16))
136	*/
137	utrie_swap(ds,
138	inData32+UPROPS_INDEX_COUNT,
139	4*(dataIndexes[UPROPS_PROPS32_INDEX]-UPROPS_INDEX_COUNT),
140	outData32+UPROPS_INDEX_COUNT,
141	pErrorCode);
142
143	/*
144	* swap the properties and exceptions words
145	* P const uint32_t props32[i1-i0];
146	* E const uint32_t exceptions[i2-i1];
147	*/
148	ds->swapArray32(ds,
149	inData32+dataIndexes[UPROPS_PROPS32_INDEX],
150	4*(dataIndexes[UPROPS_EXCEPTIONS_TOP_INDEX]-dataIndexes[UPROPS_PROPS32_INDEX]),
151	outData32+dataIndexes[UPROPS_PROPS32_INDEX],
152	pErrorCode);
153
154	/*
155	* swap the UChars
156	* U const UChar uchars[2*(i3-i2)];
157	*/
158	ds->swapArray16(ds,
159	inData32+dataIndexes[UPROPS_EXCEPTIONS_TOP_INDEX],
160	4*(dataIndexes[UPROPS_ADDITIONAL_TRIE_INDEX]-dataIndexes[UPROPS_EXCEPTIONS_TOP_INDEX]),
161	outData32+dataIndexes[UPROPS_EXCEPTIONS_TOP_INDEX],
162	pErrorCode);
163
164	/*
165	* swap the additional UTrie
166	* i3 additionalTrieIndex; -- 32-bit unit index to the additional trie for more properties
167	*/
168	utrie_swap(ds,
169	inData32+dataIndexes[UPROPS_ADDITIONAL_TRIE_INDEX],
170	4*(dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX]-dataIndexes[UPROPS_ADDITIONAL_TRIE_INDEX]),
171	outData32+dataIndexes[UPROPS_ADDITIONAL_TRIE_INDEX],
172	pErrorCode);
173
174	/*
175	* swap the properties vectors
176	* PV const uint32_t propsVectors[(i6-i4)/i5][i5]==uint32_t propsVectors[i6-i4];
177	*/
178	ds->swapArray32(ds,
179	inData32+dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX],
180	4*(dataIndexes[UPROPS_RESERVED_INDEX]-dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX]),
181	outData32+dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX],
182	pErrorCode);
183	}
184
185	/* i6 reservedItemIndex; -- 32-bit unit index to the top of the properties vectors table */
186	return headerSize+4*dataIndexes[UPROPS_RESERVED_INDEX];
187	}
188
189	/* Unicode case mapping data swapping --------------------------------------- */
190
191	U_CAPI int32_t U_EXPORT2
192	ucase_swap(const UDataSwapper *ds,
193	const void inData, int32_t length, void outData,
194	UErrorCode *pErrorCode) {
195	const UDataInfo *pInfo;
196	int32_t headerSize;
197
198	const uint8_t *inBytes;
199	uint8_t *outBytes;
200
201	const int32_t *inIndexes;
202	int32_t indexes[16];
203
204	int32_t i, offset, count, size;
205
206	/* udata_swapDataHeader checks the arguments */
207	headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode);
208	if(pErrorCode==NULL \|\| U_FAILURE(*pErrorCode)) {
209	return 0;
210	}
211
212	/* check data format and format version */
213	pInfo=(const UDataInfo )((const char )inData+4);
214	if(!(
215	pInfo->dataFormat[0]==UCASE_FMT_0 && /* dataFormat="cAsE" */
216	pInfo->dataFormat[1]==UCASE_FMT_1 &&
217	pInfo->dataFormat[2]==UCASE_FMT_2 &&
218	pInfo->dataFormat[3]==UCASE_FMT_3 &&
219	pInfo->formatVersion[0]==1 &&
220	pInfo->formatVersion[2]==UTRIE_SHIFT &&
221	pInfo->formatVersion[3]==UTRIE_INDEX_SHIFT
222	)) {
223	udata_printError(ds, "ucase_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized as case mapping data\n",
224	pInfo->dataFormat[0], pInfo->dataFormat[1],
225	pInfo->dataFormat[2], pInfo->dataFormat[3],
226	pInfo->formatVersion[0]);
227	*pErrorCode=U_UNSUPPORTED_ERROR;
228	return 0;
229	}
230
231	inBytes=(const uint8_t *)inData+headerSize;
232	outBytes=(uint8_t *)outData+headerSize;
233
234	inIndexes=(const int32_t *)inBytes;
235
236	if(length>=0) {
237	length-=headerSize;
238	if(length<16*4) {
239	udata_printError(ds, "ucase_swap(): too few bytes (%d after header) for case mapping data\n",
240	length);
241	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
242	return 0;
243	}
244	}
245
246	/* read the first 16 indexes (ICU 3.2/format version 1: UCASE_IX_TOP==16, might grow) */
247	for(i=0; i<16; ++i) {
248	indexes[i]=udata_readInt32(ds, inIndexes[i]);
249	}
250
251	/* get the total length of the data */
252	size=indexes[UCASE_IX_LENGTH];
253
254	if(length>=0) {
255	if(length<size) {
256	udata_printError(ds, "ucase_swap(): too few bytes (%d after header) for all of case mapping data\n",
257	length);
258	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
259	return 0;
260	}
261
262	/* copy the data for inaccessible bytes */
263	if(inBytes!=outBytes) {
264	uprv_memcpy(outBytes, inBytes, size);
265	}
266
267	offset=0;
268
269	/* swap the int32_t indexes[] */
270	count=indexes[UCASE_IX_INDEX_TOP]*4;
271	ds->swapArray32(ds, inBytes, count, outBytes, pErrorCode);
272	offset+=count;
273
274	/* swap the UTrie */
275	count=indexes[UCASE_IX_TRIE_SIZE];
276	utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
277	offset+=count;
278
279	/* swap the uint16_t exceptions[] and unfold[] */
280	count=(indexes[UCASE_IX_EXC_LENGTH]+indexes[UCASE_IX_UNFOLD_LENGTH])*2;
281	ds->swapArray16(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
282	offset+=count;
283
284	U_ASSERT(offset==size);
285	}
286
287	return headerSize+size;
288	}
289
290	/* Unicode bidi/shaping data swapping --------------------------------------- */
291
292	U_CAPI int32_t U_EXPORT2
293	ubidi_swap(const UDataSwapper *ds,
294	const void inData, int32_t length, void outData,
295	UErrorCode *pErrorCode) {
296	const UDataInfo *pInfo;
297	int32_t headerSize;
298
299	const uint8_t *inBytes;
300	uint8_t *outBytes;
301
302	const int32_t *inIndexes;
303	int32_t indexes[16];
304
305	int32_t i, offset, count, size;
306
307	/* udata_swapDataHeader checks the arguments */
308	headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode);
309	if(pErrorCode==NULL \|\| U_FAILURE(*pErrorCode)) {
310	return 0;
311	}
312
313	/* check data format and format version */
314	pInfo=(const UDataInfo )((const char )inData+4);
315	if(!(
316	pInfo->dataFormat[0]==UBIDI_FMT_0 && /* dataFormat="BiDi" */
317	pInfo->dataFormat[1]==UBIDI_FMT_1 &&
318	pInfo->dataFormat[2]==UBIDI_FMT_2 &&
319	pInfo->dataFormat[3]==UBIDI_FMT_3 &&
320	pInfo->formatVersion[0]==1 &&
321	pInfo->formatVersion[2]==UTRIE_SHIFT &&
322	pInfo->formatVersion[3]==UTRIE_INDEX_SHIFT
323	)) {
324	udata_printError(ds, "ubidi_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized as bidi/shaping data\n",
325	pInfo->dataFormat[0], pInfo->dataFormat[1],
326	pInfo->dataFormat[2], pInfo->dataFormat[3],
327	pInfo->formatVersion[0]);
328	*pErrorCode=U_UNSUPPORTED_ERROR;
329	return 0;
330	}
331
332	inBytes=(const uint8_t *)inData+headerSize;
333	outBytes=(uint8_t *)outData+headerSize;
334
335	inIndexes=(const int32_t *)inBytes;
336
337	if(length>=0) {
338	length-=headerSize;
339	if(length<16*4) {
340	udata_printError(ds, "ubidi_swap(): too few bytes (%d after header) for bidi/shaping data\n",
341	length);
342	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
343	return 0;
344	}
345	}
346
347	/* read the first 16 indexes (ICU 3.4/format version 1: UBIDI_IX_TOP==16, might grow) */
348	for(i=0; i<16; ++i) {
349	indexes[i]=udata_readInt32(ds, inIndexes[i]);
350	}
351
352	/* get the total length of the data */
353	size=indexes[UBIDI_IX_LENGTH];
354
355	if(length>=0) {
356	if(length<size) {
357	udata_printError(ds, "ubidi_swap(): too few bytes (%d after header) for all of bidi/shaping data\n",
358	length);
359	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
360	return 0;
361	}
362
363	/* copy the data for inaccessible bytes */
364	if(inBytes!=outBytes) {
365	uprv_memcpy(outBytes, inBytes, size);
366	}
367
368	offset=0;
369
370	/* swap the int32_t indexes[] */
371	count=indexes[UBIDI_IX_INDEX_TOP]*4;
372	ds->swapArray32(ds, inBytes, count, outBytes, pErrorCode);
373	offset+=count;
374
375	/* swap the UTrie */
376	count=indexes[UBIDI_IX_TRIE_SIZE];
377	utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
378	offset+=count;
379
380	/* swap the uint32_t mirrors[] */
381	count=indexes[UBIDI_IX_MIRROR_LENGTH]*4;
382	ds->swapArray32(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
383	offset+=count;
384
385	/* just skip the uint8_t jgArray[] */
386	count=indexes[UBIDI_IX_JG_LIMIT]-indexes[UBIDI_IX_JG_START];
387	offset+=count;
388
389	U_ASSERT(offset==size);
390	}
391
392	return headerSize+size;
393	}
394
395	/* Unicode normalization data swapping -------------------------------------- */
396
397	#if !UCONFIG_NO_NORMALIZATION
398
399	U_CAPI int32_t U_EXPORT2
400	unorm_swap(const UDataSwapper *ds,
401	const void inData, int32_t length, void outData,
402	UErrorCode *pErrorCode) {
403	const UDataInfo *pInfo;
404	int32_t headerSize;
405
406	const uint8_t *inBytes;
407	uint8_t *outBytes;
408
409	const int32_t *inIndexes;
410	int32_t indexes[32];
411
412	int32_t i, offset, count, size;
413
414	/* udata_swapDataHeader checks the arguments */
415	headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode);
416	if(pErrorCode==NULL \|\| U_FAILURE(*pErrorCode)) {
417	return 0;
418	}
419
420	/* check data format and format version */
421	pInfo=(const UDataInfo )((const char )inData+4);
422	if(!(
423	pInfo->dataFormat[0]==0x4e && /* dataFormat="Norm" */
424	pInfo->dataFormat[1]==0x6f &&
425	pInfo->dataFormat[2]==0x72 &&
426	pInfo->dataFormat[3]==0x6d &&
427	pInfo->formatVersion[0]==2
428	)) {
429	udata_printError(ds, "unorm_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized as unorm.icu\n",
430	pInfo->dataFormat[0], pInfo->dataFormat[1],
431	pInfo->dataFormat[2], pInfo->dataFormat[3],
432	pInfo->formatVersion[0]);
433	*pErrorCode=U_UNSUPPORTED_ERROR;
434	return 0;
435	}
436
437	inBytes=(const uint8_t *)inData+headerSize;
438	outBytes=(uint8_t *)outData+headerSize;
439
440	inIndexes=(const int32_t *)inBytes;
441
442	if(length>=0) {
443	length-=headerSize;
444	if(length<32*4) {
445	udata_printError(ds, "unorm_swap(): too few bytes (%d after header) for unorm.icu\n",
446	length);
447	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
448	return 0;
449	}
450	}
451
452	/* read the first 32 indexes (ICU 2.8/format version 2.2: _NORM_INDEX_TOP==32, might grow) */
453	for(i=0; i<32; ++i) {
454	indexes[i]=udata_readInt32(ds, inIndexes[i]);
455	}
456
457	/* calculate the total length of the data */
458	size=
459	324+ / size of indexes[] */
460	indexes[_NORM_INDEX_TRIE_SIZE]+
461	indexes[_NORM_INDEX_UCHAR_COUNT]*2+
462	indexes[_NORM_INDEX_COMBINE_DATA_COUNT]*2+
463	indexes[_NORM_INDEX_FCD_TRIE_SIZE]+
464	indexes[_NORM_INDEX_AUX_TRIE_SIZE]+
465	indexes[_NORM_INDEX_CANON_SET_COUNT]*2;
466
467	if(length>=0) {
468	if(length<size) {
469	udata_printError(ds, "unorm_swap(): too few bytes (%d after header) for all of unorm.icu\n",
470	length);
471	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
472	return 0;
473	}
474
475	/* copy the data for inaccessible bytes */
476	if(inBytes!=outBytes) {
477	uprv_memcpy(outBytes, inBytes, size);
478	}
479
480	offset=0;
481
482	/* swap the indexes[] */
483	count=32*4;
484	ds->swapArray32(ds, inBytes, count, outBytes, pErrorCode);
485	offset+=count;
486
487	/* swap the main UTrie */
488	count=indexes[_NORM_INDEX_TRIE_SIZE];
489	utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
490	offset+=count;
491
492	/* swap the uint16_t extraData[] and the uint16_t combiningTable[] */
493	count=(indexes[_NORM_INDEX_UCHAR_COUNT]+indexes[_NORM_INDEX_COMBINE_DATA_COUNT])*2;
494	ds->swapArray16(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
495	offset+=count;
496
497	/* swap the FCD UTrie */
498	count=indexes[_NORM_INDEX_FCD_TRIE_SIZE];
499	if(count!=0) {
500	utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
501	offset+=count;
502	}
503
504	/* swap the aux UTrie */
505	count=indexes[_NORM_INDEX_AUX_TRIE_SIZE];
506	if(count!=0) {
507	utrie_swap(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
508	offset+=count;
509	}
510
511	/* swap the uint16_t combiningTable[] */
512	count=indexes[_NORM_INDEX_CANON_SET_COUNT]*2;
513	ds->swapArray16(ds, inBytes+offset, count, outBytes+offset, pErrorCode);
514	offset+=count;
515	}
516
517	return headerSize+size;
518	}
519
520	#endif
521
522	/* swap any data (except a .dat package) ------------------------------------ */
523
524	static const struct {
525	uint8_t dataFormat[4];
526	UDataSwapFn *swapFn;
527	} swapFns[]={
528	{ { 0x52, 0x65, 0x73, 0x42 }, ures_swap }, /* dataFormat="ResB" */
529	#if !UCONFIG_NO_LEGACY_CONVERSION
530	{ { 0x63, 0x6e, 0x76, 0x74 }, ucnv_swap }, /* dataFormat="cnvt" */
531	#endif
532	#if !UCONFIG_NO_CONVERSION
533	{ { 0x43, 0x76, 0x41, 0x6c }, ucnv_swapAliases }, /* dataFormat="CvAl" */
534	#endif
535	#if !UCONFIG_NO_IDNA
536	{ { 0x53, 0x50, 0x52, 0x50 }, usprep_swap }, /* dataFormat="SPRP" */
537	#endif
538	/* insert data formats here, descending by expected frequency of occurrence */
539	{ { 0x55, 0x50, 0x72, 0x6f }, uprops_swap }, /* dataFormat="UPro" */
540
541	{ { UCASE_FMT_0, UCASE_FMT_1, UCASE_FMT_2, UCASE_FMT_3 },
542	ucase_swap }, /* dataFormat="cAsE" */
543
544	{ { UBIDI_FMT_0, UBIDI_FMT_1, UBIDI_FMT_2, UBIDI_FMT_3 },
545	ubidi_swap }, /* dataFormat="BiDi" */
546
547	#if !UCONFIG_NO_NORMALIZATION
548	{ { 0x4e, 0x6f, 0x72, 0x6d }, unorm_swap }, /* dataFormat="Norm" */
549	#endif
550	#if !UCONFIG_NO_COLLATION
551	{ { 0x55, 0x43, 0x6f, 0x6c }, ucol_swap }, /* dataFormat="UCol" */
552	{ { 0x49, 0x6e, 0x76, 0x43 }, ucol_swapInverseUCA },/* dataFormat="InvC" */
553	#endif
554	#if !UCONFIG_NO_BREAK_ITERATION
555	{ { 0x42, 0x72, 0x6b, 0x20 }, ubrk_swap }, /* dataFormat="Brk " */
556	{ { 0x54, 0x72, 0x44, 0x63 }, triedict_swap }, /* dataFormat="TrDc " */
557	#endif
558	{ { 0x70, 0x6e, 0x61, 0x6d }, upname_swap }, /* dataFormat="pnam" */
559	{ { 0x75, 0x6e, 0x61, 0x6d }, uchar_swapNames } /* dataFormat="unam" */
560	};
561
562	U_CAPI int32_t U_EXPORT2
563	udata_swap(const UDataSwapper *ds,
564	const void inData, int32_t length, void outData,
565	UErrorCode *pErrorCode) {
566	char dataFormatChars[4];
567	const UDataInfo *pInfo;
568	int32_t headerSize, i, swappedLength;
569
570	if(pErrorCode==NULL \|\| U_FAILURE(*pErrorCode)) {
571	return 0;
572	}
573
574	/*
575	* Preflight the header first; checks for illegal arguments, too.
576	* Do not swap the header right away because the format-specific swapper
577	* will swap it, get the headerSize again, and also use the header
578	* information. Otherwise we would have to pass some of the information
579	* and not be able to use the UDataSwapFn signature.
580	*/
581	headerSize=udata_swapDataHeader(ds, inData, -1, NULL, pErrorCode);
582
583	/*
584	* If we wanted udata_swap() to also handle non-loadable data like a UTrie,
585	* then we could check here for further known magic values and structures.
586	*/
587	if(U_FAILURE(*pErrorCode)) {
588	return 0; /* the data format was not recognized */
589	}
590
591	pInfo=(const UDataInfo )((const char )inData+4);
592
593	{
594	/* convert the data format from ASCII to Unicode to the system charset */
595	UChar u[4]={
596	pInfo->dataFormat[0], pInfo->dataFormat[1],
597	pInfo->dataFormat[2], pInfo->dataFormat[3]
598	};
599
600	if(uprv_isInvariantUString(u, 4)) {
601	u_UCharsToChars(u, dataFormatChars, 4);
602	} else {
603	dataFormatChars[0]=dataFormatChars[1]=dataFormatChars[2]=dataFormatChars[3]='?';
604	}
605	}
606
607	/* dispatch to the swap function for the dataFormat */
608	for(i=0; i<LENGTHOF(swapFns); ++i) {
609	if(0==memcmp(swapFns[i].dataFormat, pInfo->dataFormat, 4)) {
610	swappedLength=swapFns[i].swapFn(ds, inData, length, outData, pErrorCode);
611
612	if(U_FAILURE(*pErrorCode)) {
613	udata_printError(ds, "udata_swap(): failure swapping data format %02x.%02x.%02x.%02x (\"%c%c%c%c\") - %s\n",
614	pInfo->dataFormat[0], pInfo->dataFormat[1],
615	pInfo->dataFormat[2], pInfo->dataFormat[3],
616	dataFormatChars[0], dataFormatChars[1],
617	dataFormatChars[2], dataFormatChars[3],
618	u_errorName(*pErrorCode));
619	} else if(swappedLength<(length-15)) {
620	/* swapped less than expected */
621	udata_printError(ds, "udata_swap() warning: swapped only %d out of %d bytes - data format %02x.%02x.%02x.%02x (\"%c%c%c%c\")\n",
622	swappedLength, length,
623	pInfo->dataFormat[0], pInfo->dataFormat[1],
624	pInfo->dataFormat[2], pInfo->dataFormat[3],
625	dataFormatChars[0], dataFormatChars[1],
626	dataFormatChars[2], dataFormatChars[3],
627	u_errorName(*pErrorCode));
628	}
629
630	return swappedLength;
631	}
632	}
633
634	/* the dataFormat was not recognized */
635	udata_printError(ds, "udata_swap(): unknown data format %02x.%02x.%02x.%02x (\"%c%c%c%c\")\n",
636	pInfo->dataFormat[0], pInfo->dataFormat[1],
637	pInfo->dataFormat[2], pInfo->dataFormat[3],
638	dataFormatChars[0], dataFormatChars[1],
639	dataFormatChars[2], dataFormatChars[3]);
640
641	*pErrorCode=U_UNSUPPORTED_ERROR;
642	return 0;
643	}