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Change-Id: Ifd66bda7d528827ba61c60531121ea206a2325be
This commit is contained in:
Yuichiro Hanada 2012-09-11 10:28:15 +09:00
parent 18fc3bf4c4
commit 81d97eec0e
3 changed files with 325 additions and 282 deletions
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3
java/src/com/android/inputmethod/latin/BinaryDictionaryGetter.java
View file

@ -17,6 +17,7 @@
package com.android.inputmethod.latin;
import com.android.inputmethod.latin.makedict.BinaryDictInputOutput;
import com.android.inputmethod.latin.makedict.FormatSpec;
import android.content.Context;
import android.content.SharedPreferences;
@ -359,7 +360,7 @@ class BinaryDictionaryGetter {
final ByteBuffer buffer = inStream.getChannel().map(
FileChannel.MapMode.READ_ONLY, 0, f.length());
final int magic = buffer.getInt();
if (magic != BinaryDictInputOutput.VERSION_2_MAGIC_NUMBER) {
if (magic != FormatSpec.VERSION_2_MAGIC_NUMBER) {
return false;
}
final int formatVersion = buffer.getInt();

404
java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
View file

@ -16,7 +16,6 @@
package com.android.inputmethod.latin.makedict;
import com.android.inputmethod.latin.Constants;
import com.android.inputmethod.latin.makedict.FusionDictionary.CharGroup;
import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
import com.android.inputmethod.latin.makedict.FusionDictionary.Node;
@ -47,177 +46,6 @@ public class BinaryDictInputOutput {
private static final boolean DBG = MakedictLog.DBG;
/*
* Array of Node(FusionDictionary.Node) layout is as follows:
*
* g |
* r | the number of groups, 1 or 2 bytes.
* o | 1 byte = bbbbbbbb match
* u | case 1xxxxxxx => xxxxxxx << 8 + next byte
* p | otherwise => bbbbbbbb
* c |
* ount
*
* g |
* r | sequence of groups,
* o | the layout of each group is described below.
* u |
* ps
*
*/
/* Node(CharGroup) layout is as follows:
* | addressType xx : mask with MASK_GROUP_ADDRESS_TYPE
* 2 bits, 00 = no children : FLAG_GROUP_ADDRESS_TYPE_NOADDRESS
* f | 01 = 1 byte : FLAG_GROUP_ADDRESS_TYPE_ONEBYTE
* l | 10 = 2 bytes : FLAG_GROUP_ADDRESS_TYPE_TWOBYTES
* a | 11 = 3 bytes : FLAG_GROUP_ADDRESS_TYPE_THREEBYTES
* g | has several chars ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_MULTIPLE_CHARS
* s | has a terminal ? 1 bit, 1 = yes, 0 = no : FLAG_IS_TERMINAL
* | has shortcut targets ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_SHORTCUT_TARGETS
* | has bigrams ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_BIGRAMS
* | is not a word ? 1 bit, 1 = yes, 0 = no : FLAG_IS_NOT_A_WORD
* | is blacklisted ? 1 bit, 1 = yes, 0 = no : FLAG_IS_BLACKLISTED
*
* p |
* a | IF HAS_PARENT_ADDRESS (defined in the file header)
* r | parent address, 3byte
* e | the address must be negative, so the absolute value of the address is stored.
* n |
* taddress
*
* c | IF FLAG_HAS_MULTIPLE_CHARS
* h | char, char, char, char n * (1 or 3 bytes) : use CharGroupInfo for i/o helpers
* a | end 1 byte, = 0
* r | ELSE
* s | char 1 or 3 bytes
* | END
*
* f |
* r | IF FLAG_IS_TERMINAL
* e | frequency 1 byte
* q |
*
* c | IF 00 = FLAG_GROUP_ADDRESS_TYPE_NOADDRESS = addressType
* h | // nothing
* i | ELSIF 01 = FLAG_GROUP_ADDRESS_TYPE_ONEBYTE == addressType
* l | children address, 1 byte
* d | ELSIF 10 = FLAG_GROUP_ADDRESS_TYPE_TWOBYTES == addressType
* r | children address, 2 bytes
* e | ELSE // 11 = FLAG_GROUP_ADDRESS_TYPE_THREEBYTES = addressType
* n | children address, 3 bytes
* A | END
* d
* dress
*
* | IF FLAG_IS_TERMINAL && FLAG_HAS_SHORTCUT_TARGETS
* | shortcut string list
* | IF FLAG_IS_TERMINAL && FLAG_HAS_BIGRAMS
* | bigrams address list
*
* Char format is:
* 1 byte = bbbbbbbb match
* case 000xxxxx: xxxxx << 16 + next byte << 8 + next byte
* else: if 00011111 (= 0x1F) : this is the terminator. This is a relevant choice because
* unicode code points range from 0 to 0x10FFFF, so any 3-byte value starting with
* 00011111 would be outside unicode.
* else: iso-latin-1 code
* This allows for the whole unicode range to be encoded, including chars outside of
* the BMP. Also everything in the iso-latin-1 charset is only 1 byte, except control
* characters which should never happen anyway (and still work, but take 3 bytes).
*
* bigram address list is:
* <flags> = | hasNext = 1 bit, 1 = yes, 0 = no : FLAG_ATTRIBUTE_HAS_NEXT
* | addressSign = 1 bit, : FLAG_ATTRIBUTE_OFFSET_NEGATIVE
* | 1 = must take -address, 0 = must take +address
* | xx : mask with MASK_ATTRIBUTE_ADDRESS_TYPE
* | addressFormat = 2 bits, 00 = unused : FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE
* | 01 = 1 byte : FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE
* | 10 = 2 bytes : FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES
* | 11 = 3 bytes : FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES
* | 4 bits : frequency : mask with FLAG_ATTRIBUTE_FREQUENCY
* <address> | IF (01 == FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE == addressFormat)
* | read 1 byte, add top 4 bits
* | ELSIF (10 == FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES == addressFormat)
* | read 2 bytes, add top 4 bits
* | ELSE // 11 == FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES == addressFormat
* | read 3 bytes, add top 4 bits
* | END
* | if (FLAG_ATTRIBUTE_OFFSET_NEGATIVE) then address = -address
* if (FLAG_ATTRIBUTE_HAS_NEXT) goto bigram_and_shortcut_address_list_is
*
* shortcut string list is:
* <byte size> = GROUP_SHORTCUT_LIST_SIZE_SIZE bytes, big-endian: size of the list, in bytes.
* <flags> = | hasNext = 1 bit, 1 = yes, 0 = no : FLAG_ATTRIBUTE_HAS_NEXT
* | reserved = 3 bits, must be 0
* | 4 bits : frequency : mask with FLAG_ATTRIBUTE_FREQUENCY
* <shortcut> = | string of characters at the char format described above, with the terminator
* | used to signal the end of the string.
* if (FLAG_ATTRIBUTE_HAS_NEXT goto flags
*/
private static final int VERSION_1_MAGIC_NUMBER = 0x78B1;
public static final int VERSION_2_MAGIC_NUMBER = 0x9BC13AFE;
private static final int MINIMUM_SUPPORTED_VERSION = 1;
private static final int MAXIMUM_SUPPORTED_VERSION = 3;
private static final int NOT_A_VERSION_NUMBER = -1;
private static final int FIRST_VERSION_WITH_HEADER_SIZE = 2;
private static final int FIRST_VERSION_WITH_PARENT_ADDRESS = 3;
// These options need to be the same numeric values as the one in the native reading code.
private static final int GERMAN_UMLAUT_PROCESSING_FLAG = 0x1;
private static final int HAS_PARENT_ADDRESS = 0x2;
private static final int FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
private static final int CONTAINS_BIGRAMS_FLAG = 0x8;
// TODO: Make this value adaptative to content data, store it in the header, and
// use it in the reading code.
private static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
private static final int PARENT_ADDRESS_SIZE = 3;
private static final int MASK_GROUP_ADDRESS_TYPE = 0xC0;
private static final int FLAG_GROUP_ADDRESS_TYPE_NOADDRESS = 0x00;
private static final int FLAG_GROUP_ADDRESS_TYPE_ONEBYTE = 0x40;
private static final int FLAG_GROUP_ADDRESS_TYPE_TWOBYTES = 0x80;
private static final int FLAG_GROUP_ADDRESS_TYPE_THREEBYTES = 0xC0;
private static final int FLAG_HAS_MULTIPLE_CHARS = 0x20;
private static final int FLAG_IS_TERMINAL = 0x10;
private static final int FLAG_HAS_SHORTCUT_TARGETS = 0x08;
private static final int FLAG_HAS_BIGRAMS = 0x04;
private static final int FLAG_IS_NOT_A_WORD = 0x02;
private static final int FLAG_IS_BLACKLISTED = 0x01;
private static final int FLAG_ATTRIBUTE_HAS_NEXT = 0x80;
private static final int FLAG_ATTRIBUTE_OFFSET_NEGATIVE = 0x40;
private static final int MASK_ATTRIBUTE_ADDRESS_TYPE = 0x30;
private static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE = 0x10;
private static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES = 0x20;
private static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES = 0x30;
private static final int FLAG_ATTRIBUTE_FREQUENCY = 0x0F;
private static final int GROUP_CHARACTERS_TERMINATOR = 0x1F;
private static final int GROUP_TERMINATOR_SIZE = 1;
private static final int GROUP_FLAGS_SIZE = 1;
private static final int GROUP_FREQUENCY_SIZE = 1;
private static final int GROUP_MAX_ADDRESS_SIZE = 3;
private static final int GROUP_ATTRIBUTE_FLAGS_SIZE = 1;
private static final int GROUP_ATTRIBUTE_MAX_ADDRESS_SIZE = 3;
private static final int GROUP_SHORTCUT_LIST_SIZE_SIZE = 2;
private static final int NO_CHILDREN_ADDRESS = Integer.MIN_VALUE;
private static final int NO_PARENT_ADDRESS = 0;
private static final int INVALID_CHARACTER = -1;
private static final int MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT = 0x7F; // 127
private static final int MAX_CHARGROUPS_IN_A_NODE = 0x7FFF; // 32767
private static final int MAX_TERMINAL_FREQUENCY = 255;
private static final int MAX_BIGRAM_FREQUENCY = 15;
// Arbitrary limit to how much passes we consider address size compression should
// terminate in. At the time of this writing, our largest dictionary completes
// compression in five passes.
@ -290,9 +118,9 @@ public class BinaryDictInputOutput {
}
public FormatOptions(final int version, final boolean hasParentAddress) {
mVersion = version;
if (version < FIRST_VERSION_WITH_PARENT_ADDRESS && hasParentAddress) {
if (version < FormatSpec.FIRST_VERSION_WITH_PARENT_ADDRESS && hasParentAddress) {
throw new RuntimeException("Parent addresses are only supported with versions "
+ FIRST_VERSION_WITH_PARENT_ADDRESS + " and ulterior.");
+ FormatSpec.FIRST_VERSION_WITH_PARENT_ADDRESS + " and ulterior.");
}
mHasParentAddress = hasParentAddress;
}
@ -349,7 +177,7 @@ public class BinaryDictInputOutput {
private static int getCharSize(final int character) {
// See char encoding in FusionDictionary.java
if (fitsOnOneByte(character)) return 1;
if (INVALID_CHARACTER == character) return 1;
if (FormatSpec.INVALID_CHARACTER == character) return 1;
return 3;
}
@ -407,7 +235,7 @@ public class BinaryDictInputOutput {
buffer[index++] = (byte)(0xFF & codePoint);
}
}
buffer[index++] = GROUP_CHARACTERS_TERMINATOR;
buffer[index++] = FormatSpec.GROUP_CHARACTERS_TERMINATOR;
return index - origin;
}
@ -431,7 +259,7 @@ public class BinaryDictInputOutput {
buffer.write((byte) (0xFF & codePoint));
}
}
buffer.write(GROUP_CHARACTERS_TERMINATOR);
buffer.write(FormatSpec.GROUP_CHARACTERS_TERMINATOR);
}
/**
@ -440,7 +268,7 @@ public class BinaryDictInputOutput {
private static String readString(final FusionDictionaryBufferInterface buffer) {
final StringBuilder s = new StringBuilder();
int character = readChar(buffer);
while (character != INVALID_CHARACTER) {
while (character != FormatSpec.INVALID_CHARACTER) {
s.appendCodePoint(character);
character = readChar(buffer);
}
@ -458,7 +286,9 @@ public class BinaryDictInputOutput {
private static int readChar(final FusionDictionaryBufferInterface buffer) {
int character = buffer.readUnsignedByte();
if (!fitsOnOneByte(character)) {
if (GROUP_CHARACTERS_TERMINATOR == character) return INVALID_CHARACTER;
if (FormatSpec.GROUP_CHARACTERS_TERMINATOR == character) {
return FormatSpec.INVALID_CHARACTER;
}
character <<= 16;
character += buffer.readUnsignedShort();
}
@ -477,7 +307,7 @@ public class BinaryDictInputOutput {
*/
private static int getGroupCharactersSize(final CharGroup group) {
int size = CharEncoding.getCharArraySize(group.mChars);
if (group.hasSeveralChars()) size += GROUP_TERMINATOR_SIZE;
if (group.hasSeveralChars()) size += FormatSpec.GROUP_TERMINATOR_SIZE;
return size;
}
@ -487,13 +317,14 @@ public class BinaryDictInputOutput {
* @return the size of the group count, either 1 or 2 bytes.
*/
private static int getGroupCountSize(final int count) {
if (MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT >= count) {
if (FormatSpec.MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT >= count) {
return 1;
} else if (MAX_CHARGROUPS_IN_A_NODE >= count) {
} else if (FormatSpec.MAX_CHARGROUPS_IN_A_NODE >= count) {
return 2;
} else {
throw new RuntimeException("Can't have more than " + MAX_CHARGROUPS_IN_A_NODE
+ " groups in a node (found " + count + ")");
throw new RuntimeException("Can't have more than "
+ FormatSpec.MAX_CHARGROUPS_IN_A_NODE + " groups in a node (found " + count
+ ")");
}
}
@ -510,14 +341,14 @@ public class BinaryDictInputOutput {
* Compute the size of a shortcut in bytes.
*/
private static int getShortcutSize(final WeightedString shortcut) {
int size = GROUP_ATTRIBUTE_FLAGS_SIZE;
int size = FormatSpec.GROUP_ATTRIBUTE_FLAGS_SIZE;
final String word = shortcut.mWord;
final int length = word.length();
for (int i = 0; i < length; i = word.offsetByCodePoints(i, 1)) {
final int codePoint = word.codePointAt(i);
size += CharEncoding.getCharSize(codePoint);
}
size += GROUP_TERMINATOR_SIZE;
size += FormatSpec.GROUP_TERMINATOR_SIZE;
return size;
}
@ -529,7 +360,7 @@ public class BinaryDictInputOutput {
*/
private static int getShortcutListSize(final ArrayList<WeightedString> shortcutList) {
if (null == shortcutList) return 0;
int size = GROUP_SHORTCUT_LIST_SIZE_SIZE;
int size = FormatSpec.GROUP_SHORTCUT_LIST_SIZE_SIZE;
for (final WeightedString shortcut : shortcutList) {
size += getShortcutSize(shortcut);
}
@ -546,11 +377,12 @@ public class BinaryDictInputOutput {
private static int getCharGroupMaximumSize(final CharGroup group, final FormatOptions options) {
int size = getGroupHeaderSize(group, options);
// If terminal, one byte for the frequency
if (group.isTerminal()) size += GROUP_FREQUENCY_SIZE;
size += GROUP_MAX_ADDRESS_SIZE; // For children address
if (group.isTerminal()) size += FormatSpec.GROUP_FREQUENCY_SIZE;
size += FormatSpec.GROUP_MAX_ADDRESS_SIZE; // For children address
size += getShortcutListSize(group.mShortcutTargets);
if (null != group.mBigrams) {
size += (GROUP_ATTRIBUTE_FLAGS_SIZE + GROUP_ATTRIBUTE_MAX_ADDRESS_SIZE)
size += (FormatSpec.GROUP_ATTRIBUTE_FLAGS_SIZE
+ FormatSpec.GROUP_ATTRIBUTE_MAX_ADDRESS_SIZE)
* group.mBigrams.size();
}
return size;
@ -577,14 +409,14 @@ public class BinaryDictInputOutput {
* Helper method to hide the actual value of the no children address.
*/
private static boolean hasChildrenAddress(final int address) {
return NO_CHILDREN_ADDRESS != address;
return FormatSpec.NO_CHILDREN_ADDRESS != address;
}
/**
* Helper method to check whether the CharGroup has a parent address.
*/
private static boolean hasParentAddress(final FormatOptions options) {
return options.mVersion >= FIRST_VERSION_WITH_PARENT_ADDRESS
return options.mVersion >= FormatSpec.FIRST_VERSION_WITH_PARENT_ADDRESS
&& options.mHasParentAddress;
}
@ -596,9 +428,10 @@ public class BinaryDictInputOutput {
*/
private static int getGroupHeaderSize(final CharGroup group, final FormatOptions options) {
if (hasParentAddress(options)) {
return GROUP_FLAGS_SIZE + PARENT_ADDRESS_SIZE + getGroupCharactersSize(group);
return FormatSpec.GROUP_FLAGS_SIZE + FormatSpec.PARENT_ADDRESS_SIZE
+ getGroupCharactersSize(group);
} else {
return GROUP_FLAGS_SIZE + getGroupCharactersSize(group);
return FormatSpec.GROUP_FLAGS_SIZE + getGroupCharactersSize(group);
}
}
@ -698,7 +531,7 @@ public class BinaryDictInputOutput {
group.mCachedAddress = node.mCachedAddress + size;
}
int groupSize = getGroupHeaderSize(group, formatOptions);
if (group.isTerminal()) groupSize += GROUP_FREQUENCY_SIZE;
if (group.isTerminal()) groupSize += FormatSpec.GROUP_FREQUENCY_SIZE;
if (null != group.mChildren) {
final int offsetBasePoint = groupSize + node.mCachedAddress + size;
final int offset = group.mChildren.mCachedAddress - offsetBasePoint;
@ -711,10 +544,10 @@ public class BinaryDictInputOutput {
if (null != group.mBigrams) {
for (WeightedString bigram : group.mBigrams) {
final int offsetBasePoint = groupSize + node.mCachedAddress + size
+ GROUP_FLAGS_SIZE;
+ FormatSpec.GROUP_FLAGS_SIZE;
final int addressOfBigram = findAddressOfWord(dict, bigram.mWord);
final int offset = addressOfBigram - offsetBasePoint;
groupSize += getByteSize(offset) + GROUP_FLAGS_SIZE;
groupSize += getByteSize(offset) + FormatSpec.GROUP_FLAGS_SIZE;
}
}
group.mCachedSize = groupSize;
@ -854,20 +687,20 @@ public class BinaryDictInputOutput {
private static byte makeCharGroupFlags(final CharGroup group, final int groupAddress,
final int childrenOffset) {
byte flags = 0;
if (group.mChars.length > 1) flags |= FLAG_HAS_MULTIPLE_CHARS;
if (group.mChars.length > 1) flags |= FormatSpec.FLAG_HAS_MULTIPLE_CHARS;
if (group.mFrequency >= 0) {
flags |= FLAG_IS_TERMINAL;
flags |= FormatSpec.FLAG_IS_TERMINAL;
}
if (null != group.mChildren) {
switch (getByteSize(childrenOffset)) {
case 1:
flags |= FLAG_GROUP_ADDRESS_TYPE_ONEBYTE;
flags |= FormatSpec.FLAG_GROUP_ADDRESS_TYPE_ONEBYTE;
break;
case 2:
flags |= FLAG_GROUP_ADDRESS_TYPE_TWOBYTES;
flags |= FormatSpec.FLAG_GROUP_ADDRESS_TYPE_TWOBYTES;
break;
case 3:
flags |= FLAG_GROUP_ADDRESS_TYPE_THREEBYTES;
flags |= FormatSpec.FLAG_GROUP_ADDRESS_TYPE_THREEBYTES;
break;
default:
throw new RuntimeException("Node with a strange address");
@ -877,19 +710,19 @@ public class BinaryDictInputOutput {
if (DBG && 0 == group.mShortcutTargets.size()) {
throw new RuntimeException("0-sized shortcut list must be null");
}
flags |= FLAG_HAS_SHORTCUT_TARGETS;
flags |= FormatSpec.FLAG_HAS_SHORTCUT_TARGETS;
}
if (null != group.mBigrams) {
if (DBG && 0 == group.mBigrams.size()) {
throw new RuntimeException("0-sized bigram list must be null");
}
flags |= FLAG_HAS_BIGRAMS;
flags |= FormatSpec.FLAG_HAS_BIGRAMS;
}
if (group.mIsNotAWord) {
flags |= FLAG_IS_NOT_A_WORD;
flags |= FormatSpec.FLAG_IS_NOT_A_WORD;
}
if (group.mIsBlacklistEntry) {
flags |= FLAG_IS_BLACKLISTED;
flags |= FormatSpec.FLAG_IS_BLACKLISTED;
}
return flags;
}
@ -906,17 +739,17 @@ public class BinaryDictInputOutput {
*/
private static final int makeBigramFlags(final boolean more, final int offset,
int bigramFrequency, final int unigramFrequency, final String word) {
int bigramFlags = (more ? FLAG_ATTRIBUTE_HAS_NEXT : 0)
+ (offset < 0 ? FLAG_ATTRIBUTE_OFFSET_NEGATIVE : 0);
int bigramFlags = (more ? FormatSpec.FLAG_ATTRIBUTE_HAS_NEXT : 0)
+ (offset < 0 ? FormatSpec.FLAG_ATTRIBUTE_OFFSET_NEGATIVE : 0);
switch (getByteSize(offset)) {
case 1:
bigramFlags |= FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE;
bigramFlags |= FormatSpec.FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE;
break;
case 2:
bigramFlags |= FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES;
bigramFlags |= FormatSpec.FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES;
break;
case 3:
bigramFlags |= FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES;
bigramFlags |= FormatSpec.FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES;
break;
default:
throw new RuntimeException("Strange offset size");
@ -951,7 +784,8 @@ public class BinaryDictInputOutput {
// approximation. (0.5 to get the first step start, and 0.5 to get the middle of the
// step pointed by the discretized frequency.
final float stepSize =
(MAX_TERMINAL_FREQUENCY - unigramFrequency) / (1.5f + MAX_BIGRAM_FREQUENCY);
(FormatSpec.MAX_TERMINAL_FREQUENCY - unigramFrequency)
/ (1.5f + FormatSpec.MAX_BIGRAM_FREQUENCY);
final float firstStepStart = 1 + unigramFrequency + (stepSize / 2.0f);
final int discretizedFrequency = (int)((bigramFrequency - firstStepStart) / stepSize);
// If the bigram freq is less than half-a-step higher than the unigram freq, we get -1
@ -960,7 +794,7 @@ public class BinaryDictInputOutput {
// small over-estimation that we get in this case. TODO: actually remove this bigram
// if discretizedFrequency < 0.
final int finalBigramFrequency = discretizedFrequency > 0 ? discretizedFrequency : 0;
bigramFlags += finalBigramFrequency & FLAG_ATTRIBUTE_FREQUENCY;
bigramFlags += finalBigramFrequency & FormatSpec.FLAG_ATTRIBUTE_FREQUENCY;
return bigramFlags;
}
@ -971,10 +805,10 @@ public class BinaryDictInputOutput {
final FormatOptions formatOptions) {
final DictionaryOptions options = dictionary.mOptions;
final boolean hasBigrams = dictionary.hasBigrams();
return (options.mFrenchLigatureProcessing ? FRENCH_LIGATURE_PROCESSING_FLAG : 0)
+ (options.mGermanUmlautProcessing ? GERMAN_UMLAUT_PROCESSING_FLAG : 0)
+ (hasBigrams ? CONTAINS_BIGRAMS_FLAG : 0)
+ (formatOptions.mHasParentAddress ? HAS_PARENT_ADDRESS : 0);
return (options.mFrenchLigatureProcessing ? FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG : 0)
+ (options.mGermanUmlautProcessing ? FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG : 0)
+ (hasBigrams ? FormatSpec.CONTAINS_BIGRAMS_FLAG : 0)
+ (formatOptions.mHasParentAddress ? FormatSpec.HAS_PARENT_ADDRESS : 0);
}
/**
@ -985,7 +819,8 @@ public class BinaryDictInputOutput {
* @return the flags
*/
private static final int makeShortcutFlags(final boolean more, final int frequency) {
return (more ? FLAG_ATTRIBUTE_HAS_NEXT : 0) + (frequency & FLAG_ATTRIBUTE_FREQUENCY);
return (more ? FormatSpec.FLAG_ATTRIBUTE_HAS_NEXT : 0)
+ (frequency & FormatSpec.FLAG_ATTRIBUTE_FREQUENCY);
}
/**
@ -1025,18 +860,20 @@ public class BinaryDictInputOutput {
+ index + " <> " + group.mCachedAddress);
groupAddress += getGroupHeaderSize(group, formatOptions);
// Sanity checks.
if (DBG && group.mFrequency > MAX_TERMINAL_FREQUENCY) {
throw new RuntimeException("A node has a frequency > " + MAX_TERMINAL_FREQUENCY
if (DBG && group.mFrequency > FormatSpec.MAX_TERMINAL_FREQUENCY) {
throw new RuntimeException("A node has a frequency > "
+ FormatSpec.MAX_TERMINAL_FREQUENCY
+ " : " + group.mFrequency);
}
if (group.mFrequency >= 0) groupAddress += GROUP_FREQUENCY_SIZE;
if (group.mFrequency >= 0) groupAddress += FormatSpec.GROUP_FREQUENCY_SIZE;
final int childrenOffset = null == group.mChildren
? NO_CHILDREN_ADDRESS : group.mChildren.mCachedAddress - groupAddress;
? FormatSpec.NO_CHILDREN_ADDRESS
: group.mChildren.mCachedAddress - groupAddress;
byte flags = makeCharGroupFlags(group, groupAddress, childrenOffset);
buffer[index++] = flags;
if (hasParentAddress(formatOptions)) {
if (parentAddress == NO_PARENT_ADDRESS) {
if (parentAddress == FormatSpec.NO_PARENT_ADDRESS) {
// this node is the root node.
buffer[index] = buffer[index + 1] = buffer[index + 2] = 0;
} else {
@ -1052,7 +889,7 @@ public class BinaryDictInputOutput {
index = CharEncoding.writeCharArray(group.mChars, buffer, index);
if (group.hasSeveralChars()) {
buffer[index++] = GROUP_CHARACTERS_TERMINATOR;
buffer[index++] = FormatSpec.GROUP_CHARACTERS_TERMINATOR;
}
if (group.mFrequency >= 0) {
buffer[index++] = (byte) group.mFrequency;
@ -1064,8 +901,8 @@ public class BinaryDictInputOutput {
// Write shortcuts
if (null != group.mShortcutTargets) {
final int indexOfShortcutByteSize = index;
index += GROUP_SHORTCUT_LIST_SIZE_SIZE;
groupAddress += GROUP_SHORTCUT_LIST_SIZE_SIZE;
index += FormatSpec.GROUP_SHORTCUT_LIST_SIZE_SIZE;
groupAddress += FormatSpec.GROUP_SHORTCUT_LIST_SIZE_SIZE;
final Iterator<WeightedString> shortcutIterator = group.mShortcutTargets.iterator();
while (shortcutIterator.hasNext()) {
final WeightedString target = shortcutIterator.next();
@ -1187,28 +1024,30 @@ public class BinaryDictInputOutput {
// parents. As long as this is ensured, the dictionary file may grow to any size.
final int version = formatOptions.mVersion;
if (version < MINIMUM_SUPPORTED_VERSION || version > MAXIMUM_SUPPORTED_VERSION) {
if (version < FormatSpec.MINIMUM_SUPPORTED_VERSION
|| version > FormatSpec.MAXIMUM_SUPPORTED_VERSION) {
throw new UnsupportedFormatException("Requested file format version " + version
+ ", but this implementation only supports versions "
+ MINIMUM_SUPPORTED_VERSION + " through " + MAXIMUM_SUPPORTED_VERSION);
+ FormatSpec.MINIMUM_SUPPORTED_VERSION + " through "
+ FormatSpec.MAXIMUM_SUPPORTED_VERSION);
}
ByteArrayOutputStream headerBuffer = new ByteArrayOutputStream(256);
// The magic number in big-endian order.
if (version >= FIRST_VERSION_WITH_HEADER_SIZE) {
if (version >= FormatSpec.FIRST_VERSION_WITH_HEADER_SIZE) {
// Magic number for version 2+.
headerBuffer.write((byte) (0xFF & (VERSION_2_MAGIC_NUMBER >> 24)));
headerBuffer.write((byte) (0xFF & (VERSION_2_MAGIC_NUMBER >> 16)));
headerBuffer.write((byte) (0xFF & (VERSION_2_MAGIC_NUMBER >> 8)));
headerBuffer.write((byte) (0xFF & VERSION_2_MAGIC_NUMBER));
headerBuffer.write((byte) (0xFF & (FormatSpec.VERSION_2_MAGIC_NUMBER >> 24)));
headerBuffer.write((byte) (0xFF & (FormatSpec.VERSION_2_MAGIC_NUMBER >> 16)));
headerBuffer.write((byte) (0xFF & (FormatSpec.VERSION_2_MAGIC_NUMBER >> 8)));
headerBuffer.write((byte) (0xFF & FormatSpec.VERSION_2_MAGIC_NUMBER));
// Dictionary version.
headerBuffer.write((byte) (0xFF & (version >> 8)));
headerBuffer.write((byte) (0xFF & version));
} else {
// Magic number for version 1.
headerBuffer.write((byte) (0xFF & (VERSION_1_MAGIC_NUMBER >> 8)));
headerBuffer.write((byte) (0xFF & VERSION_1_MAGIC_NUMBER));
headerBuffer.write((byte) (0xFF & (FormatSpec.VERSION_1_MAGIC_NUMBER >> 8)));
headerBuffer.write((byte) (0xFF & FormatSpec.VERSION_1_MAGIC_NUMBER));
// Dictionary version.
headerBuffer.write((byte) (0xFF & version));
}
@ -1216,7 +1055,7 @@ public class BinaryDictInputOutput {
final int options = makeOptionsValue(dict, formatOptions);
headerBuffer.write((byte) (0xFF & (options >> 8)));
headerBuffer.write((byte) (0xFF & options));
if (version >= FIRST_VERSION_WITH_HEADER_SIZE) {
if (version >= FormatSpec.FIRST_VERSION_WITH_HEADER_SIZE) {
final int headerSizeOffset = headerBuffer.size();
// Placeholder to be written later with header size.
for (int i = 0; i < 4; ++i) {
@ -1275,7 +1114,7 @@ public class BinaryDictInputOutput {
// Input methods: Read a binary dictionary to memory.
// readDictionaryBinary is the public entry point for them.
private static final int[] CHARACTER_BUFFER = new int[MAX_WORD_LENGTH];
private static final int[] CHARACTER_BUFFER = new int[FormatSpec.MAX_WORD_LENGTH];
private static CharGroupInfo readCharGroup(final FusionDictionaryBufferInterface buffer,
final int originalGroupAddress, final FormatOptions options) {
int addressPointer = originalGroupAddress;
@ -1288,11 +1127,11 @@ public class BinaryDictInputOutput {
parentAddress = -buffer.readUnsignedInt24();
addressPointer += 3;
} else {
parentAddress = NO_PARENT_ADDRESS;
parentAddress = FormatSpec.NO_PARENT_ADDRESS;
}
final int characters[];
if (0 != (flags & FLAG_HAS_MULTIPLE_CHARS)) {
if (0 != (flags & FormatSpec.FLAG_HAS_MULTIPLE_CHARS)) {
int index = 0;
int character = CharEncoding.readChar(buffer);
addressPointer += CharEncoding.getCharSize(character);
@ -1311,33 +1150,33 @@ public class BinaryDictInputOutput {
characters = new int[] { character };
}
final int frequency;
if (0 != (FLAG_IS_TERMINAL & flags)) {
if (0 != (FormatSpec.FLAG_IS_TERMINAL & flags)) {
++addressPointer;
frequency = buffer.readUnsignedByte();
} else {
frequency = CharGroup.NOT_A_TERMINAL;
}
int childrenAddress = addressPointer;
switch (flags & MASK_GROUP_ADDRESS_TYPE) {
case FLAG_GROUP_ADDRESS_TYPE_ONEBYTE:
switch (flags & FormatSpec.MASK_GROUP_ADDRESS_TYPE) {
case FormatSpec.FLAG_GROUP_ADDRESS_TYPE_ONEBYTE:
childrenAddress += buffer.readUnsignedByte();
addressPointer += 1;
break;
case FLAG_GROUP_ADDRESS_TYPE_TWOBYTES:
case FormatSpec.FLAG_GROUP_ADDRESS_TYPE_TWOBYTES:
childrenAddress += buffer.readUnsignedShort();
addressPointer += 2;
break;
case FLAG_GROUP_ADDRESS_TYPE_THREEBYTES:
case FormatSpec.FLAG_GROUP_ADDRESS_TYPE_THREEBYTES:
childrenAddress += buffer.readUnsignedInt24();
addressPointer += 3;
break;
case FLAG_GROUP_ADDRESS_TYPE_NOADDRESS:
case FormatSpec.FLAG_GROUP_ADDRESS_TYPE_NOADDRESS:
default:
childrenAddress = NO_CHILDREN_ADDRESS;
childrenAddress = FormatSpec.NO_CHILDREN_ADDRESS;
break;
}
ArrayList<WeightedString> shortcutTargets = null;
if (0 != (flags & FLAG_HAS_SHORTCUT_TARGETS)) {
if (0 != (flags & FormatSpec.FLAG_HAS_SHORTCUT_TARGETS)) {
final int pointerBefore = buffer.position();
shortcutTargets = new ArrayList<WeightedString>();
buffer.readUnsignedShort(); // Skip the size
@ -1345,29 +1184,30 @@ public class BinaryDictInputOutput {
final int targetFlags = buffer.readUnsignedByte();
final String word = CharEncoding.readString(buffer);
shortcutTargets.add(new WeightedString(word,
targetFlags & FLAG_ATTRIBUTE_FREQUENCY));
if (0 == (targetFlags & FLAG_ATTRIBUTE_HAS_NEXT)) break;
targetFlags & FormatSpec.FLAG_ATTRIBUTE_FREQUENCY));
if (0 == (targetFlags & FormatSpec.FLAG_ATTRIBUTE_HAS_NEXT)) break;
}
addressPointer += buffer.position() - pointerBefore;
}
ArrayList<PendingAttribute> bigrams = null;
if (0 != (flags & FLAG_HAS_BIGRAMS)) {
if (0 != (flags & FormatSpec.FLAG_HAS_BIGRAMS)) {
bigrams = new ArrayList<PendingAttribute>();
while (true) {
final int bigramFlags = buffer.readUnsignedByte();
++addressPointer;
final int sign = 0 == (bigramFlags & FLAG_ATTRIBUTE_OFFSET_NEGATIVE) ? 1 : -1;
final int sign = 0 == (bigramFlags & FormatSpec.FLAG_ATTRIBUTE_OFFSET_NEGATIVE)
? 1 : -1;
int bigramAddress = addressPointer;
switch (bigramFlags & MASK_ATTRIBUTE_ADDRESS_TYPE) {
case FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE:
switch (bigramFlags & FormatSpec.MASK_ATTRIBUTE_ADDRESS_TYPE) {
case FormatSpec.FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE:
bigramAddress += sign * buffer.readUnsignedByte();
addressPointer += 1;
break;
case FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES:
case FormatSpec.FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES:
bigramAddress += sign * buffer.readUnsignedShort();
addressPointer += 2;
break;
case FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES:
case FormatSpec.FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES:
final int offset = (buffer.readUnsignedByte() << 16)
+ buffer.readUnsignedShort();
bigramAddress += sign * offset;
@ -1376,9 +1216,9 @@ public class BinaryDictInputOutput {
default:
throw new RuntimeException("Has bigrams with no address");
}
bigrams.add(new PendingAttribute(bigramFlags & FLAG_ATTRIBUTE_FREQUENCY,
bigrams.add(new PendingAttribute(bigramFlags & FormatSpec.FLAG_ATTRIBUTE_FREQUENCY,
bigramAddress));
if (0 == (bigramFlags & FLAG_ATTRIBUTE_HAS_NEXT)) break;
if (0 == (bigramFlags & FormatSpec.FLAG_ATTRIBUTE_HAS_NEXT)) break;
}
}
return new CharGroupInfo(originalGroupAddress, addressPointer, flags, characters, frequency,
@ -1390,10 +1230,10 @@ public class BinaryDictInputOutput {
*/
private static int readCharGroupCount(final FusionDictionaryBufferInterface buffer) {
final int msb = buffer.readUnsignedByte();
if (MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT >= msb) {
if (FormatSpec.MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT >= msb) {
return msb;
} else {
return ((MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT & msb) << 8)
return ((FormatSpec.MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT & msb) << 8)
+ buffer.readUnsignedByte();
}
}
@ -1432,16 +1272,16 @@ public class BinaryDictInputOutput {
return result;
}
private static int[] sGetWordBuffer = new int[MAX_WORD_LENGTH];
private static int[] sGetWordBuffer = new int[FormatSpec.MAX_WORD_LENGTH];
private static String getWordAtAddressWithParentAddress(
final FusionDictionaryBufferInterface buffer, final int headerSize, final int address,
final FormatOptions options) {
final StringBuilder builder = new StringBuilder();
int currentAddress = address;
int index = MAX_WORD_LENGTH - 1;
int index = FormatSpec.MAX_WORD_LENGTH - 1;
// the length of the path from the root to the leaf is limited by MAX_WORD_LENGTH
for (int count = 0; count < MAX_WORD_LENGTH; ++count) {
for (int count = 0; count < FormatSpec.MAX_WORD_LENGTH; ++count) {
buffer.position(currentAddress + headerSize);
final CharGroupInfo currentInfo = readCharGroup(buffer, currentAddress, options);
for (int i = 0; i < currentInfo.mCharacters.length; ++i) {
@ -1449,11 +1289,11 @@ public class BinaryDictInputOutput {
currentInfo.mCharacters[currentInfo.mCharacters.length - i - 1];
}
if (currentInfo.mParentAddress == NO_PARENT_ADDRESS) break;
if (currentInfo.mParentAddress == FormatSpec.NO_PARENT_ADDRESS) break;
currentAddress = currentInfo.mParentAddress + currentInfo.mOriginalAddress;
}
return new String(sGetWordBuffer, index + 1, MAX_WORD_LENGTH - index - 1);
return new String(sGetWordBuffer, index + 1, FormatSpec.MAX_WORD_LENGTH - index - 1);
}
private static String getWordAtAddressWithoutParentAddress(
@ -1544,13 +1384,13 @@ public class BinaryDictInputOutput {
}
nodeContents.add(
new CharGroup(info.mCharacters, shortcutTargets, bigrams, info.mFrequency,
0 != (info.mFlags & FLAG_IS_NOT_A_WORD),
0 != (info.mFlags & FLAG_IS_BLACKLISTED), children));
0 != (info.mFlags & FormatSpec.FLAG_IS_NOT_A_WORD),
0 != (info.mFlags & FormatSpec.FLAG_IS_BLACKLISTED), children));
} else {
nodeContents.add(
new CharGroup(info.mCharacters, shortcutTargets, bigrams, info.mFrequency,
0 != (info.mFlags & FLAG_IS_NOT_A_WORD),
0 != (info.mFlags & FLAG_IS_BLACKLISTED)));
0 != (info.mFlags & FormatSpec.FLAG_IS_NOT_A_WORD),
0 != (info.mFlags & FormatSpec.FLAG_IS_BLACKLISTED)));
}
groupOffset = info.mEndAddress;
}
@ -1585,7 +1425,7 @@ public class BinaryDictInputOutput {
final Map<Integer, String> words, final Map<Integer, Integer> frequencies,
final Map<Integer, ArrayList<PendingAttribute>> bigrams,
final FormatOptions formatOptions) {
int[] pushedChars = new int[MAX_WORD_LENGTH + 1];
int[] pushedChars = new int[FormatSpec.MAX_WORD_LENGTH + 1];
Stack<Position> stack = new Stack<Position>();
int index = 0;
@ -1664,10 +1504,10 @@ public class BinaryDictInputOutput {
private static int getFormatVersion(final FusionDictionaryBufferInterface buffer)
throws IOException {
final int magic_v1 = buffer.readUnsignedShort();
if (VERSION_1_MAGIC_NUMBER == magic_v1) return buffer.readUnsignedByte();
if (FormatSpec.VERSION_1_MAGIC_NUMBER == magic_v1) return buffer.readUnsignedByte();
final int magic_v2 = (magic_v1 << 16) + buffer.readUnsignedShort();
if (VERSION_2_MAGIC_NUMBER == magic_v2) return buffer.readUnsignedShort();
return NOT_A_VERSION_NUMBER;
if (FormatSpec.VERSION_2_MAGIC_NUMBER == magic_v2) return buffer.readUnsignedShort();
return FormatSpec.NOT_A_VERSION_NUMBER;
}
/**
@ -1678,10 +1518,11 @@ public class BinaryDictInputOutput {
private static int checkFormatVersion(final FusionDictionaryBufferInterface buffer)
throws IOException, UnsupportedFormatException {
final int version = getFormatVersion(buffer);
if (version < MINIMUM_SUPPORTED_VERSION || version > MAXIMUM_SUPPORTED_VERSION) {
if (version < FormatSpec.MINIMUM_SUPPORTED_VERSION
|| version > FormatSpec.MAXIMUM_SUPPORTED_VERSION) {
throw new UnsupportedFormatException("This file has version " + version
+ ", but this implementation does not support versions above "
+ MAXIMUM_SUPPORTED_VERSION);
+ FormatSpec.MAXIMUM_SUPPORTED_VERSION);
}
return version;
}
@ -1699,7 +1540,7 @@ public class BinaryDictInputOutput {
final HashMap<String, String> attributes = new HashMap<String, String>();
final int headerSize;
if (version < FIRST_VERSION_WITH_HEADER_SIZE) {
if (version < FormatSpec.FIRST_VERSION_WITH_HEADER_SIZE) {
headerSize = buffer.position();
} else {
headerSize = buffer.readInt();
@ -1713,10 +1554,10 @@ public class BinaryDictInputOutput {
final FileHeader header = new FileHeader(headerSize,
new FusionDictionary.DictionaryOptions(attributes,
0 != (optionsFlags & GERMAN_UMLAUT_PROCESSING_FLAG),
0 != (optionsFlags & FRENCH_LIGATURE_PROCESSING_FLAG)),
0 != (optionsFlags & FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG),
0 != (optionsFlags & FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG)),
new FormatOptions(version,
0 != (optionsFlags & HAS_PARENT_ADDRESS)));
0 != (optionsFlags & FormatSpec.HAS_PARENT_ADDRESS)));
return header;
}
@ -1809,7 +1650,8 @@ public class BinaryDictInputOutput {
final ByteBuffer buffer = inStream.getChannel().map(
FileChannel.MapMode.READ_ONLY, 0, file.length());
final int version = getFormatVersion(new ByteBufferWrapper(buffer));
return (version >= MINIMUM_SUPPORTED_VERSION && version <= MAXIMUM_SUPPORTED_VERSION);
return (version >= FormatSpec.MINIMUM_SUPPORTED_VERSION
&& version <= FormatSpec.MAXIMUM_SUPPORTED_VERSION);
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
@ -1836,8 +1678,8 @@ public class BinaryDictInputOutput {
*/
public static int reconstructBigramFrequency(final int unigramFrequency,
final int bigramFrequency) {
final float stepSize = (MAX_TERMINAL_FREQUENCY - unigramFrequency)
/ (1.5f + MAX_BIGRAM_FREQUENCY);
final float stepSize = (FormatSpec.MAX_TERMINAL_FREQUENCY - unigramFrequency)
/ (1.5f + FormatSpec.MAX_BIGRAM_FREQUENCY);
final float resultFreqFloat = (float)unigramFrequency
+ stepSize * (bigramFrequency + 1.0f);
return (int)resultFreqFloat;

200
java/src/com/android/inputmethod/latin/makedict/FormatSpec.java Normal file
View file

@ -0,0 +1,200 @@
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.android.inputmethod.latin.makedict;
import com.android.inputmethod.latin.Constants;
/**
* Dictionary File Format Specification.
*/
public final class FormatSpec {
/*
* Array of Node(FusionDictionary.Node) layout is as follows:
*
* g |
* r | the number of groups, 1 or 2 bytes.
* o | 1 byte = bbbbbbbb match
* u | case 1xxxxxxx => xxxxxxx << 8 + next byte
* p | otherwise => bbbbbbbb
* c |
* ount
*
* g |
* r | sequence of groups,
* o | the layout of each group is described below.
* u |
* ps
*
*/
/* Node(CharGroup) layout is as follows:
* | addressType xx : mask with MASK_GROUP_ADDRESS_TYPE
* 2 bits, 00 = no children : FLAG_GROUP_ADDRESS_TYPE_NOADDRESS
* f | 01 = 1 byte : FLAG_GROUP_ADDRESS_TYPE_ONEBYTE
* l | 10 = 2 bytes : FLAG_GROUP_ADDRESS_TYPE_TWOBYTES
* a | 11 = 3 bytes : FLAG_GROUP_ADDRESS_TYPE_THREEBYTES
* g | has several chars ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_MULTIPLE_CHARS
* s | has a terminal ? 1 bit, 1 = yes, 0 = no : FLAG_IS_TERMINAL
* | has shortcut targets ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_SHORTCUT_TARGETS
* | has bigrams ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_BIGRAMS
* | is not a word ? 1 bit, 1 = yes, 0 = no : FLAG_IS_NOT_A_WORD
* | is blacklisted ? 1 bit, 1 = yes, 0 = no : FLAG_IS_BLACKLISTED
*
* p |
* a | IF HAS_PARENT_ADDRESS (defined in the file header)
* r | parent address, 3byte
* e | the address must be negative, so the absolute value of the address is stored.
* n |
* taddress
*
* c | IF FLAG_HAS_MULTIPLE_CHARS
* h | char, char, char, char n * (1 or 3 bytes) : use CharGroupInfo for i/o helpers
* a | end 1 byte, = 0
* r | ELSE
* s | char 1 or 3 bytes
* | END
*
* f |
* r | IF FLAG_IS_TERMINAL
* e | frequency 1 byte
* q |
*
* c | IF 00 = FLAG_GROUP_ADDRESS_TYPE_NOADDRESS = addressType
* h | // nothing
* i | ELSIF 01 = FLAG_GROUP_ADDRESS_TYPE_ONEBYTE == addressType
* l | children address, 1 byte
* d | ELSIF 10 = FLAG_GROUP_ADDRESS_TYPE_TWOBYTES == addressType
* r | children address, 2 bytes
* e | ELSE // 11 = FLAG_GROUP_ADDRESS_TYPE_THREEBYTES = addressType
* n | children address, 3 bytes
* A | END
* d
* dress
*
* | IF FLAG_IS_TERMINAL && FLAG_HAS_SHORTCUT_TARGETS
* | shortcut string list
* | IF FLAG_IS_TERMINAL && FLAG_HAS_BIGRAMS
* | bigrams address list
*
* Char format is:
* 1 byte = bbbbbbbb match
* case 000xxxxx: xxxxx << 16 + next byte << 8 + next byte
* else: if 00011111 (= 0x1F) : this is the terminator. This is a relevant choice because
* unicode code points range from 0 to 0x10FFFF, so any 3-byte value starting with
* 00011111 would be outside unicode.
* else: iso-latin-1 code
* This allows for the whole unicode range to be encoded, including chars outside of
* the BMP. Also everything in the iso-latin-1 charset is only 1 byte, except control
* characters which should never happen anyway (and still work, but take 3 bytes).
*
* bigram address list is:
* <flags> = | hasNext = 1 bit, 1 = yes, 0 = no : FLAG_ATTRIBUTE_HAS_NEXT
* | addressSign = 1 bit, : FLAG_ATTRIBUTE_OFFSET_NEGATIVE
* | 1 = must take -address, 0 = must take +address
* | xx : mask with MASK_ATTRIBUTE_ADDRESS_TYPE
* | addressFormat = 2 bits, 00 = unused : FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE
* | 01 = 1 byte : FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE
* | 10 = 2 bytes : FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES
* | 11 = 3 bytes : FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES
* | 4 bits : frequency : mask with FLAG_ATTRIBUTE_FREQUENCY
* <address> | IF (01 == FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE == addressFormat)
* | read 1 byte, add top 4 bits
* | ELSIF (10 == FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES == addressFormat)
* | read 2 bytes, add top 4 bits
* | ELSE // 11 == FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES == addressFormat
* | read 3 bytes, add top 4 bits
* | END
* | if (FLAG_ATTRIBUTE_OFFSET_NEGATIVE) then address = -address
* if (FLAG_ATTRIBUTE_HAS_NEXT) goto bigram_and_shortcut_address_list_is
*
* shortcut string list is:
* <byte size> = GROUP_SHORTCUT_LIST_SIZE_SIZE bytes, big-endian: size of the list, in bytes.
* <flags> = | hasNext = 1 bit, 1 = yes, 0 = no : FLAG_ATTRIBUTE_HAS_NEXT
* | reserved = 3 bits, must be 0
* | 4 bits : frequency : mask with FLAG_ATTRIBUTE_FREQUENCY
* <shortcut> = | string of characters at the char format described above, with the terminator
* | used to signal the end of the string.
* if (FLAG_ATTRIBUTE_HAS_NEXT goto flags
*/
static final int VERSION_1_MAGIC_NUMBER = 0x78B1;
public static final int VERSION_2_MAGIC_NUMBER = 0x9BC13AFE;
static final int MINIMUM_SUPPORTED_VERSION = 1;
static final int MAXIMUM_SUPPORTED_VERSION = 3;
static final int NOT_A_VERSION_NUMBER = -1;
static final int FIRST_VERSION_WITH_HEADER_SIZE = 2;
static final int FIRST_VERSION_WITH_PARENT_ADDRESS = 3;
// These options need to be the same numeric values as the one in the native reading code.
static final int GERMAN_UMLAUT_PROCESSING_FLAG = 0x1;
static final int HAS_PARENT_ADDRESS = 0x2;
static final int FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
static final int CONTAINS_BIGRAMS_FLAG = 0x8;
// TODO: Make this value adaptative to content data, store it in the header, and
// use it in the reading code.
static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
static final int PARENT_ADDRESS_SIZE = 3;
static final int MASK_GROUP_ADDRESS_TYPE = 0xC0;
static final int FLAG_GROUP_ADDRESS_TYPE_NOADDRESS = 0x00;
static final int FLAG_GROUP_ADDRESS_TYPE_ONEBYTE = 0x40;
static final int FLAG_GROUP_ADDRESS_TYPE_TWOBYTES = 0x80;
static final int FLAG_GROUP_ADDRESS_TYPE_THREEBYTES = 0xC0;
static final int FLAG_HAS_MULTIPLE_CHARS = 0x20;
static final int FLAG_IS_TERMINAL = 0x10;
static final int FLAG_HAS_SHORTCUT_TARGETS = 0x08;
static final int FLAG_HAS_BIGRAMS = 0x04;
static final int FLAG_IS_NOT_A_WORD = 0x02;
static final int FLAG_IS_BLACKLISTED = 0x01;
static final int FLAG_ATTRIBUTE_HAS_NEXT = 0x80;
static final int FLAG_ATTRIBUTE_OFFSET_NEGATIVE = 0x40;
static final int MASK_ATTRIBUTE_ADDRESS_TYPE = 0x30;
static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE = 0x10;
static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES = 0x20;
static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES = 0x30;
static final int FLAG_ATTRIBUTE_FREQUENCY = 0x0F;
static final int GROUP_CHARACTERS_TERMINATOR = 0x1F;
static final int GROUP_TERMINATOR_SIZE = 1;
static final int GROUP_FLAGS_SIZE = 1;
static final int GROUP_FREQUENCY_SIZE = 1;
static final int GROUP_MAX_ADDRESS_SIZE = 3;
static final int GROUP_ATTRIBUTE_FLAGS_SIZE = 1;
static final int GROUP_ATTRIBUTE_MAX_ADDRESS_SIZE = 3;
static final int GROUP_SHORTCUT_LIST_SIZE_SIZE = 2;
static final int NO_CHILDREN_ADDRESS = Integer.MIN_VALUE;
static final int NO_PARENT_ADDRESS = 0;
static final int INVALID_CHARACTER = -1;
static final int MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT = 0x7F; // 127
static final int MAX_CHARGROUPS_IN_A_NODE = 0x7FFF; // 32767
static final int MAX_TERMINAL_FREQUENCY = 255;
static final int MAX_BIGRAM_FREQUENCY = 15;
private FormatSpec() {
// This utility class is not publicly instantiable.
}
}