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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/*
*******************************************************************************
* Copyright (C) 1996-2015, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/
package com.ibm.icu.text;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import com.ibm.icu.impl.CharTrie;
import com.ibm.icu.impl.ICUBinary;
import com.ibm.icu.impl.ICUBinary.Authenticate;
import com.ibm.icu.impl.Trie;
/**
* Internal class used for Rule Based Break Iterators
* This class provides access to the compiled break rule data, as
* it is stored in a .brk file.
*/
final class RBBIDataWrapper {
//
// These fields are the ready-to-use compiled rule data, as
// read from the file.
//
RBBIDataHeader fHeader;
short fFTable[];
short fRTable[];
short fSFTable[];
short fSRTable[];
CharTrie fTrie;
String fRuleSource;
int fStatusTable[];
private boolean isBigEndian;
static final int DATA_FORMAT = 0x42726b20; // "Brk "
static final int FORMAT_VERSION = 0x03010000; // 3.1
private static final class IsAcceptable implements Authenticate {
// @Override when we switch to Java 6
@Override
public boolean isDataVersionAcceptable(byte version[]) {
return version[0] == (FORMAT_VERSION >>> 24);
}
}
private static final IsAcceptable IS_ACCEPTABLE = new IsAcceptable();
//
// Indexes to fields in the ICU4C style binary form of the RBBI Data Header
// Used by the rule compiler when flattening the data.
//
final static int DH_SIZE = 24;
final static int DH_MAGIC = 0;
final static int DH_FORMATVERSION = 1;
final static int DH_LENGTH = 2;
final static int DH_CATCOUNT = 3;
final static int DH_FTABLE = 4;
final static int DH_FTABLELEN = 5;
final static int DH_RTABLE = 6;
final static int DH_RTABLELEN = 7;
final static int DH_SFTABLE = 8;
final static int DH_SFTABLELEN = 9;
final static int DH_SRTABLE = 10;
final static int DH_SRTABLELEN = 11;
final static int DH_TRIE = 12;
final static int DH_TRIELEN = 13;
final static int DH_RULESOURCE = 14;
final static int DH_RULESOURCELEN = 15;
final static int DH_STATUSTABLE = 16;
final static int DH_STATUSTABLELEN = 17;
// Index offsets to the fields in a state table row.
// Corresponds to struct RBBIStateTableRow in the C version.
//
final static int ACCEPTING = 0;
final static int LOOKAHEAD = 1;
final static int TAGIDX = 2;
final static int RESERVED = 3;
final static int NEXTSTATES = 4;
// Index offsets to header fields of a state table
// struct RBBIStateTable {... in the C version.
//
static final int NUMSTATES = 0;
static final int ROWLEN = 2;
static final int FLAGS = 4;
//ivate static final int RESERVED_2 = 6;
private static final int ROW_DATA = 8;
// Bit selectors for the "FLAGS" field of the state table header
// enum RBBIStateTableFlags in the C version.
//
final static int RBBI_LOOKAHEAD_HARD_BREAK = 1;
final static int RBBI_BOF_REQUIRED = 2;
/**
* Data Header. A struct-like class with the fields from the RBBI data file header.
*/
final static class RBBIDataHeader {
int fMagic; // == 0xbla0
int fVersion; // == 1 (for ICU 3.2 and earlier.
byte[] fFormatVersion; // For ICU 3.4 and later.
int fLength; // Total length in bytes of this RBBI Data,
// including all sections, not just the header.
int fCatCount; // Number of character categories.
//
// Offsets and sizes of each of the subsections within the RBBI data.
// All offsets are bytes from the start of the RBBIDataHeader.
// All sizes are in bytes.
//
int fFTable; // forward state transition table.
int fFTableLen;
int fRTable; // Offset to the reverse state transition table.
int fRTableLen;
int fSFTable; // safe point forward transition table
int fSFTableLen;
int fSRTable; // safe point reverse transition table
int fSRTableLen;
int fTrie; // Offset to Trie data for character categories
int fTrieLen;
int fRuleSource; // Offset to the source for for the break
int fRuleSourceLen; // rules. Stored UChar *.
int fStatusTable; // Offset to the table of rule status values
int fStatusTableLen;
public RBBIDataHeader() {
fMagic = 0;
fFormatVersion = new byte[4];
}
}
/**
* RBBI State Table Indexing Function. Given a state number, return the
* array index of the start of the state table row for that state.
*
*/
int getRowIndex(int state){
return ROW_DATA + state * (fHeader.fCatCount + 4);
}
static class TrieFoldingFunc implements Trie.DataManipulate {
@Override
public int getFoldingOffset(int data) {
if ((data & 0x8000) != 0) {
return data & 0x7fff;
} else {
return 0;
}
}
}
static TrieFoldingFunc fTrieFoldingFunc = new TrieFoldingFunc();
RBBIDataWrapper() {
}
/*
* Get an RBBIDataWrapper from an InputStream onto a pre-compiled set
* of RBBI rules.
*/
static RBBIDataWrapper get(ByteBuffer bytes) throws IOException {
RBBIDataWrapper This = new RBBIDataWrapper();
ICUBinary.readHeader(bytes, DATA_FORMAT, IS_ACCEPTABLE);
This.isBigEndian = bytes.order() == ByteOrder.BIG_ENDIAN;
// Read in the RBBI data header...
This.fHeader = new RBBIDataHeader();
This.fHeader.fMagic = bytes.getInt();
// Read the same 4 bytes as an int and as a byte array: The data format could be
// the old fVersion=1 (TODO: probably not with a real ICU data header?)
// or the new fFormatVersion=3.x.
This.fHeader.fVersion = bytes.getInt(bytes.position());
This.fHeader.fFormatVersion[0] = bytes.get();
This.fHeader.fFormatVersion[1] = bytes.get();
This.fHeader.fFormatVersion[2] = bytes.get();
This.fHeader.fFormatVersion[3] = bytes.get();
This.fHeader.fLength = bytes.getInt();
This.fHeader.fCatCount = bytes.getInt();
This.fHeader.fFTable = bytes.getInt();
This.fHeader.fFTableLen = bytes.getInt();
This.fHeader.fRTable = bytes.getInt();
This.fHeader.fRTableLen = bytes.getInt();
This.fHeader.fSFTable = bytes.getInt();
This.fHeader.fSFTableLen = bytes.getInt();
This.fHeader.fSRTable = bytes.getInt();
This.fHeader.fSRTableLen = bytes.getInt();
This.fHeader.fTrie = bytes.getInt();
This.fHeader.fTrieLen = bytes.getInt();
This.fHeader.fRuleSource = bytes.getInt();
This.fHeader.fRuleSourceLen = bytes.getInt();
This.fHeader.fStatusTable = bytes.getInt();
This.fHeader.fStatusTableLen = bytes.getInt();
ICUBinary.skipBytes(bytes, 6 * 4); // uint32_t fReserved[6];
if (This.fHeader.fMagic != 0xb1a0 ||
! (This.fHeader.fVersion == 1 || // ICU 3.2 and earlier
This.fHeader.fFormatVersion[0] == 3) // ICU 3.4
) {
throw new IOException("Break Iterator Rule Data Magic Number Incorrect, or unsupported data version.");
}
// Current position in the buffer.
int pos = 24 * 4; // offset of end of header, which has 24 fields, all int32_t (4 bytes)
//
// Read in the Forward state transition table as an array of shorts.
//
// Quick Sanity Check
if (This.fHeader.fFTable < pos || This.fHeader.fFTable > This.fHeader.fLength) {
throw new IOException("Break iterator Rule data corrupt");
}
// Skip over any padding preceding this table
ICUBinary.skipBytes(bytes, This.fHeader.fFTable - pos);
pos = This.fHeader.fFTable;
This.fFTable = ICUBinary.getShorts(
bytes, This.fHeader.fFTableLen / 2, This.fHeader.fFTableLen & 1);
pos += This.fHeader.fFTableLen;
//
// Read in the Reverse state table
//
// Skip over any padding in the file
ICUBinary.skipBytes(bytes, This.fHeader.fRTable - pos);
pos = This.fHeader.fRTable;
// Create & fill the table itself.
This.fRTable = ICUBinary.getShorts(
bytes, This.fHeader.fRTableLen / 2, This.fHeader.fRTableLen & 1);
pos += This.fHeader.fRTableLen;
//
// Read in the Safe Forward state table
//
if (This.fHeader.fSFTableLen > 0) {
// Skip over any padding in the file
ICUBinary.skipBytes(bytes, This.fHeader.fSFTable - pos);
pos = This.fHeader.fSFTable;
// Create & fill the table itself.
This.fSFTable = ICUBinary.getShorts(
bytes, This.fHeader.fSFTableLen / 2, This.fHeader.fSFTableLen & 1);
pos += This.fHeader.fSFTableLen;
}
//
// Read in the Safe Reverse state table
//
if (This.fHeader.fSRTableLen > 0) {
// Skip over any padding in the file
ICUBinary.skipBytes(bytes, This.fHeader.fSRTable - pos);
pos = This.fHeader.fSRTable;
// Create & fill the table itself.
This.fSRTable = ICUBinary.getShorts(
bytes, This.fHeader.fSRTableLen / 2, This.fHeader.fSRTableLen & 1);
pos += This.fHeader.fSRTableLen;
}
//
// Unserialize the Character categories TRIE
// Because we can't be absolutely certain where the Trie deserialize will
// leave the buffer, leave position unchanged.
// The seek to the start of the next item following the TRIE will get us
// back in sync.
//
ICUBinary.skipBytes(bytes, This.fHeader.fTrie - pos); // seek buffer from end of
pos = This.fHeader.fTrie; // previous section to the start of the trie
bytes.mark(); // Mark position of start of TRIE in the input
// and tell Java to keep the mark valid so long
// as we don't go more than 100 bytes past the
// past the end of the TRIE.
This.fTrie = new CharTrie(bytes, fTrieFoldingFunc); // Deserialize the TRIE, leaving buffer
// at an unknown position, preceding the
// padding between TRIE and following section.
bytes.reset(); // Move buffer back to marked position at
// the start of the serialized TRIE. Now our
// "pos" variable and the buffer are in
// agreement.
//
// Read the Rule Status Table
//
if (pos > This.fHeader.fStatusTable) {
throw new IOException("Break iterator Rule data corrupt");
}
ICUBinary.skipBytes(bytes, This.fHeader.fStatusTable - pos);
pos = This.fHeader.fStatusTable;
This.fStatusTable = ICUBinary.getInts(
bytes, This.fHeader.fStatusTableLen / 4, This.fHeader.fStatusTableLen & 3);
pos += This.fHeader.fStatusTableLen;
//
// Put the break rule source into a String
//
if (pos > This.fHeader.fRuleSource) {
throw new IOException("Break iterator Rule data corrupt");
}
ICUBinary.skipBytes(bytes, This.fHeader.fRuleSource - pos);
pos = This.fHeader.fRuleSource;
This.fRuleSource = ICUBinary.getString(
bytes, This.fHeader.fRuleSourceLen / 2, This.fHeader.fRuleSourceLen & 1);
if (RuleBasedBreakIterator.fDebugEnv!=null && RuleBasedBreakIterator.fDebugEnv.indexOf("data")>=0) {
This.dump(System.out);
}
return This;
}
///CLOVER:OFF
// Getters for fields from the state table header
//
private int getStateTableNumStates(short table[]) {
if (isBigEndian) {
return (table[NUMSTATES] << 16) | (table[NUMSTATES+1] & 0xffff);
} else {
return (table[NUMSTATES+1] << 16) | (table[NUMSTATES] & 0xffff);
}
}
///CLOVER:ON
int getStateTableFlags(short table[]) {
// This works for up to 15 flags bits.
return table[isBigEndian ? FLAGS + 1 : FLAGS];
}
///CLOVER:OFF
/* Debug function to display the break iterator data. */
void dump(java.io.PrintStream out) {
if (fFTable.length == 0) {
// There is no table. Fail early for testing purposes.
throw new NullPointerException();
}
out.println("RBBI Data Wrapper dump ...");
out.println();
out.println("Forward State Table");
dumpTable(out, fFTable);
out.println("Reverse State Table");
dumpTable(out, fRTable);
out.println("Forward Safe Points Table");
dumpTable(out, fSFTable);
out.println("Reverse Safe Points Table");
dumpTable(out, fSRTable);
dumpCharCategories(out);
out.println("Source Rules: " + fRuleSource);
}
///CLOVER:ON
///CLOVER:OFF
/* Fixed width int-to-string conversion. */
static public String intToString(int n, int width) {
StringBuilder dest = new StringBuilder(width);
dest.append(n);
while (dest.length() < width) {
dest.insert(0, ' ');
}
return dest.toString();
}
///CLOVER:ON
///CLOVER:OFF
/* Fixed width int-to-string conversion. */
static public String intToHexString(int n, int width) {
StringBuilder dest = new StringBuilder(width);
dest.append(Integer.toHexString(n));
while (dest.length() < width) {
dest.insert(0, ' ');
}
return dest.toString();
}
///CLOVER:ON
///CLOVER:OFF
/** Dump a state table. (A full set of RBBI rules has 4 state tables.) */
private void dumpTable(java.io.PrintStream out, short table[]) {
if (table == null) {
out.println(" -- null -- ");
} else {
int n;
int state;
StringBuilder header = new StringBuilder(" Row Acc Look Tag");
for (n=0; n fHeader.fCatCount) {
out.println("Error, bad category " + Integer.toHexString(category) +
" for char " + Integer.toHexString(char32));
break;
}
if (category == lastCat ) {
rangeEnd = char32;
} else {
if (lastCat >= 0) {
if (catStrings[lastCat].length() > lastNewline[lastCat] + 70) {
lastNewline[lastCat] = catStrings[lastCat].length() + 10;
catStrings[lastCat] += "\n ";
}
catStrings[lastCat] += " " + Integer.toHexString(rangeStart);
if (rangeEnd != rangeStart) {
catStrings[lastCat] += "-" + Integer.toHexString(rangeEnd);
}
}
lastCat = category;
rangeStart = rangeEnd = char32;
}
}
catStrings[lastCat] += " " + Integer.toHexString(rangeStart);
if (rangeEnd != rangeStart) {
catStrings[lastCat] += "-" + Integer.toHexString(rangeEnd);
}
for (category = 0; category <= fHeader.fCatCount; category ++) {
out.println (intToString(category, 5) + " " + catStrings[category]);
}
out.println();
}
///CLOVER:ON
/*static RBBIDataWrapper get(String name) throws IOException {
String fullName = "data/" + name;
InputStream is = ICUData.getRequiredStream(fullName);
return get(is);
}
public static void main(String[] args) {
String s;
if (args.length == 0) {
s = "char";
} else {
s = args[0];
}
System.out.println("RBBIDataWrapper.main(" + s + ") ");
String versionedName = ICUResourceBundle.ICU_BUNDLE+"/"+ s + ".brk";
try {
RBBIDataWrapper This = RBBIDataWrapper.get(versionedName);
This.dump();
}
catch (Exception e) {
System.out.println("Exception: " + e.toString());
}
}*/
}