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Check the binary dictionary magic number

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...and return NULL if it does not matched an expected value.

Bug: 5052486
Change-Id: I1dc7955d2785ee080bc5c22398be9befe332f096
This commit is contained in:
Jean Chalard 2011-07-20 18:42:32 +09:00
parent 597b115797
commit f0a9809662
2 changed files with 40 additions and 6 deletions
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33
native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
View File

@ -17,6 +17,7 @@
#define LOG_TAG "LatinIME: jni: BinaryDictionary"
#include "binary_format.h"
#include "com_android_inputmethod_latin_BinaryDictionary.h"
#include "dictionary.h"
#include "jni.h"
@ -38,6 +39,8 @@
namespace latinime {
void releaseDictBuf(void* dictBuf, const size_t length, int fd);
static jint latinime_BinaryDictionary_open(JNIEnv *env, jobject object,
jstring sourceDir, jlong dictOffset, jlong dictSize,
jint typedLetterMultiplier, jint fullWordMultiplier, jint maxWordLength, jint maxWords,
@ -104,8 +107,18 @@ static jint latinime_BinaryDictionary_open(JNIEnv *env, jobject object,
LOGE("DICT: dictBuf is null");
return 0;
}
Dictionary *dictionary = new Dictionary(dictBuf, dictSize, fd, adjust, typedLetterMultiplier,
fullWordMultiplier, maxWordLength, maxWords, maxAlternatives);
Dictionary *dictionary = NULL;
if (BinaryFormat::UNKNOWN_FORMAT == BinaryFormat::detectFormat((uint8_t*)dictBuf)) {
LOGE("DICT: dictionary format is unknown, bad magic number");
#ifdef USE_MMAP_FOR_DICTIONARY
releaseDictBuf(((char*)dictBuf) - adjust, adjDictSize, fd);
#else // USE_MMAP_FOR_DICTIONARY
releaseDictBuf(dictBuf, 0, 0);
#endif // USE_MMAP_FOR_DICTIONARY
} else {
dictionary = new Dictionary(dictBuf, dictSize, fd, adjust, typedLetterMultiplier,
fullWordMultiplier, maxWordLength, maxWords, maxAlternatives);
}
PROF_END(66);
PROF_CLOSE;
return (jint)dictionary;
@ -180,19 +193,27 @@ static void latinime_BinaryDictionary_close(JNIEnv *env, jobject object, jint di
void *dictBuf = dictionary->getDict();
if (!dictBuf) return;
#ifdef USE_MMAP_FOR_DICTIONARY
int ret = munmap((void *)((char *)dictBuf - dictionary->getDictBufAdjust()),
dictionary->getDictSize() + dictionary->getDictBufAdjust());
releaseDictBuf((void *)((char *)dictBuf - dictionary->getDictBufAdjust()),
dictionary->getDictSize() + dictionary->getDictBufAdjust(), dictionary->getMmapFd());
#else // USE_MMAP_FOR_DICTIONARY
releaseDictBuf(dictBuf, 0, 0);
#endif // USE_MMAP_FOR_DICTIONARY
delete dictionary;
}
void releaseDictBuf(void* dictBuf, const size_t length, int fd) {
#ifdef USE_MMAP_FOR_DICTIONARY
int ret = munmap(dictBuf, length);
if (ret != 0) {
LOGE("DICT: Failure in munmap. ret=%d errno=%d", ret, errno);
}
ret = close(dictionary->getMmapFd());
ret = close(fd);
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 sMethods[] = {

13
native/src/binary_format.h
View File

@ -17,6 +17,8 @@
#ifndef LATINIME_BINARY_FORMAT_H
#define LATINIME_BINARY_FORMAT_H
#include "unigram_dictionary.h"
namespace latinime {
class BinaryFormat {
@ -26,6 +28,11 @@ private:
const static int MULTIPLE_BYTE_CHARACTER_ADDITIONAL_SIZE = 2;
public:
const static int UNKNOWN_FORMAT = -1;
const static int FORMAT_VERSION_1 = 1;
const static uint16_t FORMAT_VERSION_1_MAGIC_NUMBER = 0x78B1;
static int detectFormat(const uint8_t* const dict);
static int getGroupCountAndForwardPointer(const uint8_t* const dict, int* pos);
static uint8_t getFlagsAndForwardPointer(const uint8_t* const dict, int* pos);
static int32_t getCharCodeAndForwardPointer(const uint8_t* const dict, int* pos);
@ -43,6 +50,12 @@ public:
int *pos);
};
inline int BinaryFormat::detectFormat(const uint8_t* const dict) {
const uint16_t magicNumber = (dict[0] << 8) + dict[1]; // big endian
if (FORMAT_VERSION_1_MAGIC_NUMBER == magicNumber) return FORMAT_VERSION_1;
return UNKNOWN_FORMAT;
}
inline int BinaryFormat::getGroupCountAndForwardPointer(const uint8_t* const dict, int* pos) {
return dict[(*pos)++];
}