// © 2016 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

/*

***************************************************************************

*   Copyright (C) 1999-2014 International Business Machines Corporation   *

*   and others. All rights reserved.                                      *

***************************************************************************

*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_BREAK_ITERATION

#include "unicode/utypes.h"

#include "rbbidata.h"

#include "rbbirb.h"

#include "utrie2.h"

#include "udatamem.h"

#include "cmemory.h"

#include "cstring.h"

#include "umutex.h"

#include "uassert.h"

U_NAMESPACE_BEGIN

//-----------------------------------------------------------------------------

//

//    Constructors.

//

//-----------------------------------------------------------------------------

RBBIDataWrapper::RBBIDataWrapper(const RBBIDataHeader *data, UErrorCode &status) {

    init0();

    init(data, status);

}

RBBIDataWrapper::RBBIDataWrapper(const RBBIDataHeader *data, enum EDontAdopt, UErrorCode &status) {

    init0();

    init(data, status);

    fDontFreeData = TRUE;

}

RBBIDataWrapper::RBBIDataWrapper(UDataMemory* udm, UErrorCode &status) {

    init0();

    if (U_FAILURE(status)) {

        return;

    }

    const DataHeader *dh = udm->pHeader;

    int32_t headerSize = dh->dataHeader.headerSize;

    if (  !(headerSize >= 20 &&

            dh->info.isBigEndian == U_IS_BIG_ENDIAN &&

            dh->info.charsetFamily == U_CHARSET_FAMILY &&

            dh->info.dataFormat[0] == 0x42 &&  // dataFormat="Brk "

            dh->info.dataFormat[1] == 0x72 &&

            dh->info.dataFormat[2] == 0x6b &&

            dh->info.dataFormat[3] == 0x20 &&

            isDataVersionAcceptable(dh->info.formatVersion))

        ) {

        status = U_INVALID_FORMAT_ERROR;

        return;

    }

    const char *dataAsBytes = reinterpret_cast<const char *>(dh);

    const RBBIDataHeader *rbbidh = reinterpret_cast<const RBBIDataHeader *>(dataAsBytes + headerSize);

    init(rbbidh, status);

    fUDataMem = udm;

}

UBool RBBIDataWrapper::isDataVersionAcceptable(const UVersionInfo version) {

    return RBBI_DATA_FORMAT_VERSION[0] == version[0];

}

//-----------------------------------------------------------------------------

//

//    init().   Does most of the work of construction, shared between the

//              constructors.

//

//-----------------------------------------------------------------------------

void RBBIDataWrapper::init0() {

    fHeader = NULL;

    fForwardTable = NULL;

    fReverseTable = NULL;

    fRuleSource   = NULL;

    fRuleStatusTable = NULL;

    fTrie         = NULL;

    fUDataMem     = NULL;

    fRefCount     = 0;

    fDontFreeData = TRUE;

}

void RBBIDataWrapper::init(const RBBIDataHeader *data, UErrorCode &status) {

    if (U_FAILURE(status)) {

        return;

    }

    fHeader = data;

    if (fHeader->fMagic != 0xb1a0 || !isDataVersionAcceptable(fHeader->fFormatVersion)) {

        status = U_INVALID_FORMAT_ERROR;

        return;

    }

    // Note: in ICU version 3.2 and earlier, there was a formatVersion 1

    //       that is no longer supported.  At that time fFormatVersion was

    //       an int32_t field, rather than an array of 4 bytes.

    fDontFreeData = FALSE;

    if (data->fFTableLen != 0) {

        fForwardTable = (RBBIStateTable *)((char *)data + fHeader->fFTable);

    }

    if (data->fRTableLen != 0) {

        fReverseTable = (RBBIStateTable *)((char *)data + fHeader->fRTable);

    }

    fTrie = utrie2_openFromSerialized(UTRIE2_16_VALUE_BITS,

                                      (uint8_t *)data + fHeader->fTrie,

                                      fHeader->fTrieLen,

                                      NULL,           // *actual length

                                      &status);

    if (U_FAILURE(status)) {

        return;

    }

    fRuleSource   = (UChar *)((char *)data + fHeader->fRuleSource);

    fRuleString.setTo(TRUE, fRuleSource, -1);

    U_ASSERT(data->fRuleSourceLen > 0);

    fRuleStatusTable = (int32_t *)((char *)data + fHeader->fStatusTable);

    fStatusMaxIdx    = data->fStatusTableLen / sizeof(int32_t);

    fRefCount = 1;

#ifdef RBBI_DEBUG

    char *debugEnv = getenv("U_RBBIDEBUG");

    if (debugEnv && uprv_strstr(debugEnv, "data")) {this->printData();}

#endif

}

//-----------------------------------------------------------------------------

//

//    Destructor.     Don't call this - use removeReference() instead.

//

//-----------------------------------------------------------------------------

RBBIDataWrapper::~RBBIDataWrapper() {

    U_ASSERT(fRefCount == 0);

    utrie2_close(fTrie);

    fTrie = NULL;

    if (fUDataMem) {

        udata_close(fUDataMem);

    } else if (!fDontFreeData) {

        uprv_free((void *)fHeader);

    }

}

//-----------------------------------------------------------------------------

//

//   Operator ==    Consider two RBBIDataWrappers to be equal if they

//                  refer to the same underlying data.  Although

//                  the data wrappers are normally shared between

//                  iterator instances, it's possible to independently

//                  open the same data twice, and get two instances, which

//                  should still be ==.

//

//-----------------------------------------------------------------------------

UBool RBBIDataWrapper::operator ==(const RBBIDataWrapper &other) const {

    if (fHeader == other.fHeader) {

        return TRUE;

    }

    if (fHeader->fLength != other.fHeader->fLength) {

        return FALSE;

    }

    if (uprv_memcmp(fHeader, other.fHeader, fHeader->fLength) == 0) {

        return TRUE;

    }

    return FALSE;

}

int32_t  RBBIDataWrapper::hashCode() {

    return fHeader->fFTableLen;

}

//-----------------------------------------------------------------------------

//

//    Reference Counting.   A single RBBIDataWrapper object is shared among

//                          however many RulesBasedBreakIterator instances are

//                          referencing the same data.

//

//-----------------------------------------------------------------------------

void RBBIDataWrapper::removeReference() {

    if (umtx_atomic_dec(&fRefCount) == 0) {

        delete this;

    }

}

RBBIDataWrapper *RBBIDataWrapper::addReference() {

   umtx_atomic_inc(&fRefCount);

   return this;

}

//-----------------------------------------------------------------------------

//

//  getRuleSourceString

//

//-----------------------------------------------------------------------------

const UnicodeString &RBBIDataWrapper::getRuleSourceString() const {

    return fRuleString;

}

//-----------------------------------------------------------------------------

//

//  print   -  debugging function to dump the runtime data tables.

//

//-----------------------------------------------------------------------------

#ifdef RBBI_DEBUG

void  RBBIDataWrapper::printTable(const char *heading, const RBBIStateTable *table) {

    uint32_t   c;

    uint32_t   s;

    RBBIDebugPrintf("   %s\n", heading);

    RBBIDebugPrintf("State |  Acc  LA TagIx");

    for (c=0; c<fHeader->fCatCount; c++) {RBBIDebugPrintf("%3d ", c);}

    RBBIDebugPrintf("\n------|---------------"); for (c=0;c<fHeader->fCatCount; c++) {

        RBBIDebugPrintf("----");

    }

    RBBIDebugPrintf("\n");

    if (table == NULL) {

        RBBIDebugPrintf("         N U L L   T A B L E\n\n");

        return;

    }

    for (s=0; s<table->fNumStates; s++) {

        RBBIStateTableRow *row = (RBBIStateTableRow *)

                                  (table->fTableData + (table->fRowLen * s));

        RBBIDebugPrintf("%4d  |  %3d %3d %3d ", s, row->fAccepting, row->fLookAhead, row->fTagIdx);

        for (c=0; c<fHeader->fCatCount; c++)  {

            RBBIDebugPrintf("%3d ", row->fNextState[c]);

        }

        RBBIDebugPrintf("\n");

    }

    RBBIDebugPrintf("\n");

}

#endif

void  RBBIDataWrapper::printData() {

#ifdef RBBI_DEBUG

    RBBIDebugPrintf("RBBI Data at %p\n", (void *)fHeader);

    RBBIDebugPrintf("   Version = {%d %d %d %d}\n", fHeader->fFormatVersion[0], fHeader->fFormatVersion[1],

                                                    fHeader->fFormatVersion[2], fHeader->fFormatVersion[3]);

    RBBIDebugPrintf("   total length of data  = %d\n", fHeader->fLength);

    RBBIDebugPrintf("   number of character categories = %d\n\n", fHeader->fCatCount);

    printTable("Forward State Transition Table", fForwardTable);

    printTable("Reverse State Transition Table", fReverseTable);

    RBBIDebugPrintf("\nOrignal Rules source:\n");

    for (int32_t c=0; fRuleSource[c] != 0; c++) {

        RBBIDebugPrintf("%c", fRuleSource[c]);

    }

    RBBIDebugPrintf("\n\n");

#endif

}

U_NAMESPACE_END

U_NAMESPACE_USE

//-----------------------------------------------------------------------------

//

//  ubrk_swap   -  byte swap and char encoding swap of RBBI data

//

//-----------------------------------------------------------------------------

U_CAPI int32_t U_EXPORT2

ubrk_swap(const UDataSwapper *ds, const void *inData, int32_t length, void *outData,

           UErrorCode *status) {

    if (status == NULL || U_FAILURE(*status)) {

        return 0;

    }

    if(ds==NULL || inData==NULL || length<-1 || (length>0 && outData==NULL)) {

        *status=U_ILLEGAL_ARGUMENT_ERROR;

        return 0;

    }

    //

    //  Check that the data header is for for break data.

    //    (Header contents are defined in genbrk.cpp)

    //

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

    if(!(  pInfo->dataFormat[0]==0x42 &&   /* dataFormat="Brk " */

           pInfo->dataFormat[1]==0x72 &&

           pInfo->dataFormat[2]==0x6b &&

           pInfo->dataFormat[3]==0x20 &&

           RBBIDataWrapper::isDataVersionAcceptable(pInfo->formatVersion) )) {

        udata_printError(ds, "ubrk_swap(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized\n",

                         pInfo->dataFormat[0], pInfo->dataFormat[1],

                         pInfo->dataFormat[2], pInfo->dataFormat[3],

                         pInfo->formatVersion[0]);

        *status=U_UNSUPPORTED_ERROR;

        return 0;

    }

    //

    // Swap the data header.  (This is the generic ICU Data Header, not the RBBI Specific

    //                         RBBIDataHeader).  This swap also conveniently gets us

    //                         the size of the ICU d.h., which lets us locate the start

    //                         of the RBBI specific data.

    //

    int32_t headerSize=udata_swapDataHeader(ds, inData, length, outData, status);

    //

    // Get the RRBI Data Header, and check that it appears to be OK.

    //

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

    RBBIDataHeader *rbbiDH = (RBBIDataHeader *)inBytes;

    if (ds->readUInt32(rbbiDH->fMagic) != 0xb1a0 || 

            !RBBIDataWrapper::isDataVersionAcceptable(rbbiDH->fFormatVersion) ||

            ds->readUInt32(rbbiDH->fLength)  <  sizeof(RBBIDataHeader)) {

        udata_printError(ds, "ubrk_swap(): RBBI Data header is invalid.\n");

        *status=U_UNSUPPORTED_ERROR;

        return 0;

    }

    //

    // Prefight operation?  Just return the size

    //

    int32_t breakDataLength = ds->readUInt32(rbbiDH->fLength);

    int32_t totalSize = headerSize + breakDataLength;

    if (length < 0) {

        return totalSize;

    }

    //

    // Check that length passed in is consistent with length from RBBI data header.

    //

    if (length < totalSize) {

        udata_printError(ds, "ubrk_swap(): too few bytes (%d after ICU Data header) for break data.\n",

                            breakDataLength);

        *status=U_INDEX_OUTOFBOUNDS_ERROR;

        return 0;

        }

    //

    // Swap the Data.  Do the data itself first, then the RBBI Data Header, because

    //                 we need to reference the header to locate the data, and an

    //                 inplace swap of the header leaves it unusable.

    //

    uint8_t         *outBytes = (uint8_t *)outData + headerSize;

    RBBIDataHeader  *outputDH = (RBBIDataHeader *)outBytes;

    int32_t   tableStartOffset;

    int32_t   tableLength;

    //

    // If not swapping in place, zero out the output buffer before starting.

    //    Individual tables and other data items within are aligned to 8 byte boundaries

    //    when originally created.  Any unused space between items needs to be zero.

    //

    if (inBytes != outBytes) {

        uprv_memset(outBytes, 0, breakDataLength);

    }

    //

    // Each state table begins with several 32 bit fields.  Calculate the size

    //   in bytes of these.

    //

    int32_t         topSize = offsetof(RBBIStateTable, fTableData);

    // Forward state table.  

    tableStartOffset = ds->readUInt32(rbbiDH->fFTable);

    tableLength      = ds->readUInt32(rbbiDH->fFTableLen);

    if (tableLength > 0) {

        ds->swapArray32(ds, inBytes+tableStartOffset, topSize, 

                            outBytes+tableStartOffset, status);

        ds->swapArray16(ds, inBytes+tableStartOffset+topSize, tableLength-topSize,

                            outBytes+tableStartOffset+topSize, status);

    }

    // Reverse state table.  Same layout as forward table, above.

    tableStartOffset = ds->readUInt32(rbbiDH->fRTable);

    tableLength      = ds->readUInt32(rbbiDH->fRTableLen);

    if (tableLength > 0) {

        ds->swapArray32(ds, inBytes+tableStartOffset, topSize, 

                            outBytes+tableStartOffset, status);

        ds->swapArray16(ds, inBytes+tableStartOffset+topSize, tableLength-topSize,

                            outBytes+tableStartOffset+topSize, status);

    }

    // Trie table for character categories

    utrie2_swap(ds, inBytes+ds->readUInt32(rbbiDH->fTrie), ds->readUInt32(rbbiDH->fTrieLen),

                    outBytes+ds->readUInt32(rbbiDH->fTrie), status);

    // Source Rules Text.  It's UChar data

    ds->swapArray16(ds, inBytes+ds->readUInt32(rbbiDH->fRuleSource), ds->readUInt32(rbbiDH->fRuleSourceLen),

                        outBytes+ds->readUInt32(rbbiDH->fRuleSource), status);

    // Table of rule status values.  It's all int_32 values

    ds->swapArray32(ds, inBytes+ds->readUInt32(rbbiDH->fStatusTable), ds->readUInt32(rbbiDH->fStatusTableLen),

                        outBytes+ds->readUInt32(rbbiDH->fStatusTable), status);

    // And, last, the header.

    //   It is all int32_t values except for fFormataVersion, which is an array of four bytes.

    //   Swap the whole thing as int32_t, then re-swap the one field.

    //

    ds->swapArray32(ds, inBytes, sizeof(RBBIDataHeader), outBytes, status);

    ds->swapArray32(ds, outputDH->fFormatVersion, 4, outputDH->fFormatVersion, status);

    return totalSize;

}

#endif /* #if !UCONFIG_NO_BREAK_ITERATION */