Check in the pristine copy of ICU 4.6...

icu46/source/tools/toolutil/swapimpl.cpp

+/*
+*******************************************************************************
+*
+*   Copyright (C) 2005-2010, 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"
+
+/* Explicit include statement for std_string.h is needed
+ * for compilation on certain platforms. (e.g. AIX/VACPP)
+ */
+#include "unicode/std_string.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 "normalizer2impl.h"
+#include "sprpimpl.h"
+#include "propname.h"
+#include "rbbidata.h"
+#include "triedict.h"
+#include "utrie2.h"
+
+/* swapping implementations in i18n */
+
+#if !UCONFIG_NO_NORMALIZATION
+#include "uspoof_impl.h"
+#endif
+
+
+/* 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 &&
+        (3<=pInfo->formatVersion[0] && pInfo->formatVersion[0]<=7) &&
+        (pInfo->formatVersion[0]>=7 ||
+            (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
+     */
+    int32_t dataTop;
+    if(length>=0) {
+        int32_t *outData32;
+
+        /*
+         * In formatVersion 7, UPROPS_DATA_TOP_INDEX has the post-header data size.
+         * In earlier formatVersions, it is 0 and a lower dataIndexes entry
+         * has the top of the last item.
+         */
+        for(i=UPROPS_DATA_TOP_INDEX; i>0 && (dataTop=dataIndexes[i])==0; --i) {}
+
+        if((length-headerSize)<(4*dataTop)) {
+            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*dataTop);
+        }
+
+        /* 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))
+         */
+        utrie2_swapAnyVersion(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
+         */
+        utrie2_swapAnyVersion(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_SCRIPT_EXTENSIONS_INDEX]-dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX]),
+            outData32+dataIndexes[UPROPS_ADDITIONAL_VECTORS_INDEX],
+            pErrorCode);
+
+        // swap the Script_Extensions data
+        // SCX const uint16_t scriptExtensions[2*(i7-i6)];
+        ds->swapArray16(ds,
+            inData32+dataIndexes[UPROPS_SCRIPT_EXTENSIONS_INDEX],
+            4*(dataIndexes[UPROPS_RESERVED_INDEX_7]-dataIndexes[UPROPS_SCRIPT_EXTENSIONS_INDEX]),
+            outData32+dataIndexes[UPROPS_SCRIPT_EXTENSIONS_INDEX],
+            pErrorCode);
+    }
+
+    /* i7 reservedIndex7; -- 32-bit unit index to the top of the Script_Extensions data */
+    return headerSize+4*dataIndexes[UPROPS_RESERVED_INDEX_7];
+}
+
+/* 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) ||
+         pInfo->formatVersion[0]==2)
+    )) {
+        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];
+        utrie2_swapAnyVersion(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) ||
+         pInfo->formatVersion[0]==2)
+    )) {
+        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];
+        utrie2_swapAnyVersion(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 'Test' data from gentest */
+U_CAPI int32_t U_EXPORT2
+test_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;
+
+    int32_t offset;
+
+    /* udata_swapDataHeader checks the arguments */
+    headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode);
+    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
+        udata_printError(ds, "test_swap(): data header swap failed %s\n", u_errorName(*pErrorCode));
+        return 0;
+    }
+
+    /* check data format and format version */
+    pInfo=(const UDataInfo *)((const char *)inData+4);
+    if(!(
+        pInfo->dataFormat[0]==0x54 &&   /* dataFormat="Norm" */
+        pInfo->dataFormat[1]==0x65 &&
+        pInfo->dataFormat[2]==0x73 &&
+        pInfo->dataFormat[3]==0x74 &&
+        pInfo->formatVersion[0]==1
+    )) {
+        udata_printError(ds, "test_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized as testdata\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;
+
+    int32_t size16 = 2; // 16bit plus padding
+    int32_t sizeStr = 5; // 4 char inv-str plus null
+    int32_t size = size16 + sizeStr;
+
+    if(length>=0) {
+        if(length<size) {
+            udata_printError(ds, "test_swap(): too few bytes (%d after header, wanted %d) for all of testdata\n",
+                             length, size);
+            *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+            return 0;
+        }
+
+        offset =0;
+        /* swap a 1 entry array */
+        ds->swapArray16(ds, inBytes+offset, size16, outBytes+offset, pErrorCode);
+        offset+=size16;
+        ds->swapInvChars(ds, inBytes+offset, sizeStr, outBytes+offset, pErrorCode);
+    }
+
+    return headerSize+size;
+}
+
+/* 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" */
+    { { 0x4e, 0x72, 0x6d, 0x32 }, unorm2_swap },        /* dataFormat="Nrm2" */
+#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" */
+#if !UCONFIG_NO_NORMALIZATION
+    { { 0x43, 0x66, 0x75, 0x20 }, uspoof_swap },         /* dataFormat="Cfu " */
+#endif
+    { { 0x54, 0x65, 0x73, 0x74 }, test_swap }            /* dataFormat="Test" */
+};
+
+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;
+}