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Write multi-byte chargroup count to the binary dict

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Change-Id: I093739933652c1e8c70c06f92077d1e3dbd7d7da
This commit is contained in:
Jean Chalard 2012-01-16 15:17:06 +09:00
parent d82fd6c3cc
commit 2c0903b1d1
1 changed files with 36 additions and 14 deletions
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50
tools/makedict/src/com/android/inputmethod/latin/BinaryDictInputOutput.java
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@ -144,7 +144,6 @@ public class BinaryDictInputOutput {
private static final int GROUP_CHARACTERS_TERMINATOR = 0x1F;
private static final int GROUP_COUNT_SIZE = 1;
private static final int GROUP_TERMINATOR_SIZE = 1;
private static final int GROUP_FLAGS_SIZE = 1;
private static final int GROUP_FREQUENCY_SIZE = 1;
@ -155,9 +154,8 @@ public class BinaryDictInputOutput {
private static final int NO_CHILDREN_ADDRESS = Integer.MIN_VALUE;
private static final int INVALID_CHARACTER = -1;
// Limiting to 127 for upward compatibility
// TODO: implement a scheme to be able to shoot 256 chargroups in a node
private static final int MAX_CHARGROUPS_IN_A_NODE = 127;
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;
@ -266,6 +264,22 @@ public class BinaryDictInputOutput {
return size;
}
/**
* Compute the binary size of the group count for a node
* @param node the node
* @return the size of the group count, either 1 or 2 bytes.
*/
private static int getGroupCountSize(final Node node) {
if (MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT >= node.mData.size()) {
return 1;
} else if (MAX_CHARGROUPS_IN_A_NODE >= node.mData.size()) {
return 2;
} else {
throw new RuntimeException("Can't have more than " + MAX_CHARGROUPS_IN_A_NODE
+ " groups in a node (found " + node.mData.size() +")");
}
}
/**
* Compute the maximum size of a CharGroup, assuming 3-byte addresses for everything.
*
@ -295,7 +309,7 @@ public class BinaryDictInputOutput {
* @param node the node to compute the maximum size of.
*/
private static void setNodeMaximumSize(Node node) {
int size = GROUP_COUNT_SIZE;
int size = getGroupCountSize(node);
for (CharGroup g : node.mData) {
final int groupSize = getCharGroupMaximumSize(g);
g.mCachedSize = groupSize;
@ -394,7 +408,7 @@ public class BinaryDictInputOutput {
* @param dict the dictionary in which the word/attributes are to be found.
*/
private static void computeActualNodeSize(Node node, FusionDictionary dict) {
int size = GROUP_COUNT_SIZE;
int size = getGroupCountSize(node);
for (CharGroup group : node.mData) {
int groupSize = GROUP_FLAGS_SIZE + getGroupCharactersSize(group);
if (group.isTerminal()) groupSize += GROUP_FREQUENCY_SIZE;
@ -437,12 +451,13 @@ public class BinaryDictInputOutput {
int nodeOffset = 0;
for (Node n : flatNodes) {
n.mCachedAddress = nodeOffset;
int groupCountSize = getGroupCountSize(n);
int groupOffset = 0;
for (CharGroup g : n.mData) {
g.mCachedAddress = GROUP_COUNT_SIZE + nodeOffset + groupOffset;
g.mCachedAddress = groupCountSize + nodeOffset + groupOffset;
groupOffset += g.mCachedSize;
}
if (groupOffset + GROUP_COUNT_SIZE != n.mCachedSize) {
if (groupOffset + groupCountSize != n.mCachedSize) {
throw new RuntimeException("Bug : Stored and computed node size differ");
}
nodeOffset += n.mCachedSize;
@ -629,13 +644,20 @@ public class BinaryDictInputOutput {
private static int writePlacedNode(FusionDictionary dict, byte[] buffer, Node node) {
int index = node.mCachedAddress;
final int size = node.mData.size();
if (size > MAX_CHARGROUPS_IN_A_NODE)
throw new RuntimeException("A node has a group count over 127 (" + size + ").");
buffer[index++] = (byte)size;
final int groupCount = node.mData.size();
final int countSize = getGroupCountSize(node);
if (1 == countSize) {
buffer[index++] = (byte)groupCount;
} else if (2 == countSize) {
// We need to signal 2-byte size by setting the top bit of the MSB to 1, so
// we | 0x80 to do this.
buffer[index++] = (byte)((groupCount >> 8) | 0x80);
buffer[index++] = (byte)(groupCount & 0xFF);
} else {
throw new RuntimeException("Strange size from getGroupCountSize : " + countSize);
}
int groupAddress = index;
for (int i = 0; i < size; ++i) {
for (int i = 0; i < groupCount; ++i) {
CharGroup group = node.mData.get(i);
if (index != group.mCachedAddress) throw new RuntimeException("Bug: write index is not "
+ "the same as the cached address of the group");