LatinIME/native/jni/com_android_inputmethod_lat...

258 lines
8.8 KiB
C++

/*
**
** Copyright 2009, 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.
*/
#define LOG_TAG "LatinIME: jni"
#include "dictionary.h"
#include "jni.h"
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#ifdef USE_MMAP_FOR_DICTIONARY
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#else // USE_MMAP_FOR_DICTIONARY
#include <stdlib.h>
#endif // USE_MMAP_FOR_DICTIONARY
// ----------------------------------------------------------------------------
using namespace latinime;
//
// helper function to throw an exception
//
static void throwException(JNIEnv *env, const char* ex, const char* fmt, int data) {
if (jclass cls = env->FindClass(ex)) {
char msg[1000];
sprintf(msg, fmt, data);
env->ThrowNew(cls, msg);
env->DeleteLocalRef(cls);
}
}
static jint latinime_BinaryDictionary_open(JNIEnv *env, jobject object,
jstring sourceDir, jlong dictOffset, jlong dictSize,
jint typedLetterMultiplier, jint fullWordMultiplier, jint maxWordLength, jint maxWords,
jint maxAlternatives) {
PROF_OPEN;
PROF_START(66);
const char *sourceDirChars = env->GetStringUTFChars(sourceDir, NULL);
if (sourceDirChars == NULL) {
LOGE("DICT: Can't get sourceDir string");
return 0;
}
int fd = 0;
void *dictBuf = NULL;
int adjust = 0;
#ifdef USE_MMAP_FOR_DICTIONARY
/* mmap version */
fd = open(sourceDirChars, O_RDONLY);
if (fd < 0) {
LOGE("DICT: Can't open sourceDir. sourceDirChars=%s errno=%d", sourceDirChars, errno);
return 0;
}
int pagesize = getpagesize();
adjust = dictOffset % pagesize;
int adjDictOffset = dictOffset - adjust;
int adjDictSize = dictSize + adjust;
dictBuf = mmap(NULL, sizeof(char) * adjDictSize, PROT_READ, MAP_PRIVATE, fd, adjDictOffset);
if (dictBuf == MAP_FAILED) {
LOGE("DICT: Can't mmap dictionary. errno=%d", errno);
return 0;
}
dictBuf = (void *)((char *)dictBuf + adjust);
#else // USE_MMAP_FOR_DICTIONARY
/* malloc version */
FILE *file = NULL;
file = fopen(sourceDirChars, "rb");
if (file == NULL) {
LOGE("DICT: Can't fopen sourceDir. sourceDirChars=%s errno=%d", sourceDirChars, errno);
return 0;
}
dictBuf = malloc(sizeof(char) * dictSize);
if (!dictBuf) {
LOGE("DICT: Can't allocate memory region for dictionary. errno=%d", errno);
return 0;
}
int ret = fseek(file, (long)dictOffset, SEEK_SET);
if (ret != 0) {
LOGE("DICT: Failure in fseek. ret=%d errno=%d", ret, errno);
return 0;
}
ret = fread(dictBuf, sizeof(char) * dictSize, 1, file);
if (ret != 1) {
LOGE("DICT: Failure in fread. ret=%d errno=%d", ret, errno);
return 0;
}
ret = fclose(file);
if (ret != 0) {
LOGE("DICT: Failure in fclose. ret=%d errno=%d", ret, errno);
return 0;
}
#endif // USE_MMAP_FOR_DICTIONARY
env->ReleaseStringUTFChars(sourceDir, sourceDirChars);
if (!dictBuf) {
LOGE("DICT: dictBuf is null");
return 0;
}
Dictionary *dictionary = new Dictionary(dictBuf, dictSize, fd, adjust, typedLetterMultiplier,
fullWordMultiplier, maxWordLength, maxWords, maxAlternatives);
PROF_END(66);
PROF_CLOSE;
return (jint)dictionary;
}
static int latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jobject object, jint dict,
jintArray inputArray, jint arraySize, jcharArray outputArray, jintArray frequencyArray) {
Dictionary *dictionary = (Dictionary*)dict;
if (!dictionary) return 0;
int *frequencies = env->GetIntArrayElements(frequencyArray, NULL);
int *inputCodes = env->GetIntArrayElements(inputArray, NULL);
jchar *outputChars = env->GetCharArrayElements(outputArray, NULL);
int count = dictionary->getSuggestions(inputCodes, arraySize, (unsigned short*) outputChars,
frequencies);
env->ReleaseIntArrayElements(frequencyArray, frequencies, 0);
env->ReleaseIntArrayElements(inputArray, inputCodes, JNI_ABORT);
env->ReleaseCharArrayElements(outputArray, outputChars, 0);
return count;
}
static int latinime_BinaryDictionary_getBigrams(JNIEnv *env, jobject object, jint dict,
jcharArray prevWordArray, jint prevWordLength, jintArray inputArray, jint inputArraySize,
jcharArray outputArray, jintArray frequencyArray, jint maxWordLength, jint maxBigrams,
jint maxAlternatives) {
Dictionary *dictionary = (Dictionary*)dict;
if (!dictionary) return 0;
jchar *prevWord = env->GetCharArrayElements(prevWordArray, NULL);
int *inputCodes = env->GetIntArrayElements(inputArray, NULL);
jchar *outputChars = env->GetCharArrayElements(outputArray, NULL);
int *frequencies = env->GetIntArrayElements(frequencyArray, NULL);
int count = dictionary->getBigrams((unsigned short*) prevWord, prevWordLength, inputCodes,
inputArraySize, (unsigned short*) outputChars, frequencies, maxWordLength, maxBigrams,
maxAlternatives);
env->ReleaseCharArrayElements(prevWordArray, prevWord, JNI_ABORT);
env->ReleaseIntArrayElements(inputArray, inputCodes, JNI_ABORT);
env->ReleaseCharArrayElements(outputArray, outputChars, 0);
env->ReleaseIntArrayElements(frequencyArray, frequencies, 0);
return count;
}
static jboolean latinime_BinaryDictionary_isValidWord(JNIEnv *env, jobject object, jint dict,
jcharArray wordArray, jint wordLength) {
Dictionary *dictionary = (Dictionary*)dict;
if (!dictionary) return (jboolean) false;
jchar *word = env->GetCharArrayElements(wordArray, NULL);
jboolean result = dictionary->isValidWord((unsigned short*) word, wordLength);
env->ReleaseCharArrayElements(wordArray, word, JNI_ABORT);
return result;
}
static void latinime_BinaryDictionary_close(JNIEnv *env, jobject object, jint dict) {
Dictionary *dictionary = (Dictionary*)dict;
if (!dictionary) return;
void *dictBuf = dictionary->getDict();
if (!dictBuf) return;
#ifdef USE_MMAP_FOR_DICTIONARY
int ret = munmap((void *)((char *)dictBuf - dictionary->getDictBufAdjust()),
dictionary->getDictSize() + dictionary->getDictBufAdjust());
if (ret != 0) {
LOGE("DICT: Failure in munmap. ret=%d errno=%d", ret, errno);
}
ret = close(dictionary->getMmapFd());
if (ret != 0) {
LOGE("DICT: Failure in close. ret=%d errno=%d", ret, errno);
}
#else // USE_MMAP_FOR_DICTIONARY
free(dictBuf);
#endif // USE_MMAP_FOR_DICTIONARY
delete dictionary;
}
// ----------------------------------------------------------------------------
static JNINativeMethod gMethods[] = {
{"openNative", "(Ljava/lang/String;JJIIIII)I", (void*)latinime_BinaryDictionary_open},
{"closeNative", "(I)V", (void*)latinime_BinaryDictionary_close},
{"getSuggestionsNative", "(I[II[C[I)I", (void*)latinime_BinaryDictionary_getSuggestions},
{"isValidWordNative", "(I[CI)Z", (void*)latinime_BinaryDictionary_isValidWord},
{"getBigramsNative", "(I[CI[II[C[IIII)I", (void*)latinime_BinaryDictionary_getBigrams}
};
static int registerNativeMethods(JNIEnv* env, const char* className, JNINativeMethod* gMethods,
int numMethods) {
jclass clazz;
clazz = env->FindClass(className);
if (clazz == NULL) {
LOGE("Native registration unable to find class '%s'", className);
return JNI_FALSE;
}
if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
LOGE("RegisterNatives failed for '%s'", className);
return JNI_FALSE;
}
return JNI_TRUE;
}
static int registerNatives(JNIEnv *env) {
const char* const kClassPathName = "com/android/inputmethod/latin/BinaryDictionary";
return registerNativeMethods(env, kClassPathName, gMethods,
sizeof(gMethods) / sizeof(gMethods[0]));
}
/*
* Returns the JNI version on success, -1 on failure.
*/
jint JNI_OnLoad(JavaVM* vm, void* reserved) {
JNIEnv* env = NULL;
jint result = -1;
if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
LOGE("ERROR: GetEnv failed");
goto bail;
}
assert(env != NULL);
if (!registerNatives(env)) {
LOGE("ERROR: BinaryDictionary native registration failed");
goto bail;
}
/* success -- return valid version number */
result = JNI_VERSION_1_4;
bail:
return result;
}