/*
* Given an open optimized DEX file, map it into read-only shared memory and
* parse the contents.
*
* Returns nonzero on error.
*/
int dvmDexFileOpenFromFd(int fd, DvmDex** ppDvmDex)
{
DvmDex* pDvmDex;
DexFile* pDexFile;
MemMapping memMap;
int parseFlags = kDexParseDefault;
int result = -1;
if (gDvm.verifyDexChecksum)
parseFlags |= kDexParseVerifyChecksum;
if (lseek(fd, 0, SEEK_SET) < 0) {
LOGE("lseek rewind failed\n");
goto bail;
}
if (sysMapFileInShmemWritableReadOnly(fd, &memMap) != 0) {
LOGE("Unable to map file\n");
goto bail;
}
pDexFile = dexFileParse(memMap.addr, memMap.length, parseFlags);
if (pDexFile == NULL) {
LOGE("DEX parse failed\n");
sysReleaseShmem(&memMap);
goto bail;
}
pDvmDex = allocateAuxStructures(pDexFile);
if (pDvmDex == NULL) {
dexFileFree(pDexFile);
sysReleaseShmem(&memMap);
goto bail;
}
//This seems like the best place to initialize the DvmDex mutex.
dvmInitMutex(&pDvmDex->modLock);
/* tuck this into the DexFile so it gets released later */
sysCopyMap(&pDvmDex->memMap, &memMap);
*ppDvmDex = pDvmDex;
result = 0;
bail:
return result;
}
/*
Given an open optimized DEX file, map it into read-only shared memory and
parse the contents.
Returns nonzero on error.
给定一个打开的已优化的DEX文件，映射到只读共享内存并且解析内容。
错误返回非0。
*/
int dvmDexFileOpenFromFd(int fd, DvmDex** ppDvmDex)
{
DvmDex* pDvmDex;
DexFile* pDexFile;
MemMapping memMap;
int parseFlags = kDexParseDefault;
int result = -1;
if (gDvm.verifyDexChecksum)
parseFlags |= kDexParseVerifyChecksum;
if (lseek(fd, 0, SEEK_SET) < 0) {
ALOGE("lseek rewind failed");
goto bail;
}
if (sysMapFileInShmemWritableReadOnly(fd, &memMap) != 0) {
ALOGE("Unable to map file");
goto bail;
}
pDexFile = dexFileParse((u1*)memMap.addr, memMap.length, parseFlags);
if (pDexFile == NULL) {
ALOGE("DEX parse failed");
sysReleaseShmem(&memMap);
goto bail;
}
pDvmDex = allocateAuxStructures(pDexFile);
if (pDvmDex == NULL) {
dexFileFree(pDexFile);
sysReleaseShmem(&memMap);
goto bail;
}
/* tuck this into the DexFile so it gets released later */
sysCopyMap(&pDvmDex->memMap, &memMap);
pDvmDex->isMappedReadOnly = true;
*ppDvmDex = pDvmDex;
result = 0;
bail:
return result;
}
/*
* Map the specified DEX file read-only (possibly after expanding it into a
* temp file from a Jar). Pass in a MemMapping struct to hold the info.
* If the file is an unoptimized DEX file, then byte-swapping and structural
* verification are performed on it before the memory is made read-only.
*
* The temp file is deleted after the map succeeds.
*
* This is intended for use by tools (e.g. dexdump) that need to get a
* read-only copy of a DEX file that could be in a number of different states.
*
* If "tempFileName" is NULL, a default value is used. The temp file is
* deleted after the map succeeds.
*
* If "quiet" is set, don't report common errors.
*
* Returns 0 (kUTFRSuccess) on success.
*/
UnzipToFileResult dexOpenAndMap(const char* fileName, const char* tempFileName,
MemMapping* pMap, bool quiet)
{
UnzipToFileResult result = kUTFRGenericFailure;
int len = strlen(fileName);
char tempNameBuf[32];
bool removeTemp = false;
int fd = -1;
if (len < 5) {
if (!quiet) {
fprintf(stderr,
"ERROR: filename must end in .dex, .zip, .jar, or .apk\n");
}
result = kUTFRBadArgs;
goto bail;
}
if (strcasecmp(fileName + len -3, "dex") != 0) {
if (tempFileName == NULL) {
/*
* Try .zip/.jar/.apk, all of which are Zip archives with
* "classes.dex" inside. We need to extract the compressed
* data to a temp file, the location of which varies.
*
* On the device we must use /sdcard because most other
* directories aren't writable (either because of permissions
* or because the volume is mounted read-only). On desktop
* it's nice to use the designated temp directory.
*/
if (access("/tmp", W_OK) == 0) {
sprintf(tempNameBuf, "/tmp/dex-temp-%d", getpid());
} else if (access("/sdcard", W_OK) == 0) {
sprintf(tempNameBuf, "/sdcard/dex-temp-%d", getpid());
} else {
fprintf(stderr,
"NOTE: /tmp and /sdcard unavailable for temp files\n");
sprintf(tempNameBuf, "dex-temp-%d", getpid());
}
tempFileName = tempNameBuf;
}
result = dexUnzipToFile(fileName, tempFileName, quiet);
if (result == kUTFRSuccess) {
//printf("+++ Good unzip to '%s'\n", tempFileName);
fileName = tempFileName;
removeTemp = true;
} else if (result == kUTFRNotZip) {
if (!quiet) {
fprintf(stderr, "Not Zip, retrying as DEX\n");
}
} else {
if (!quiet && result == kUTFRNoClassesDex) {
fprintf(stderr, "Zip has no classes.dex\n");
}
goto bail;
}
}
result = kUTFRGenericFailure;
/*
* Pop open the (presumed) DEX file.
*/
fd = open(fileName, O_RDONLY | O_BINARY);
if (fd < 0) {
if (!quiet) {
fprintf(stderr, "ERROR: unable to open '%s': %s\n",
fileName, strerror(errno));
}
goto bail;
}
if (sysMapFileInShmemWritableReadOnly(fd, pMap) != 0) {
fprintf(stderr, "ERROR: Unable to map '%s'\n", fileName);
goto bail;
}
/*
* This call will fail if the file exists on a filesystem that
* doesn't support mprotect(). If that's the case, then the file
* will have already been mapped private-writable by the previous
* call, so we don't need to do anything special if this call
* returns non-zero.
*/
sysChangeMapAccess(pMap->addr, pMap->length, true, pMap);
if (dexSwapAndVerifyIfNecessary((u1*) pMap->addr, pMap->length)) {
fprintf(stderr, "ERROR: Failed structural verification of '%s'\n",
fileName);
goto bail;
}
/*
* Similar to above, this call will fail if the file wasn't ever
* read-only to begin with. This is innocuous, though it is
* undesirable from a memory hygiene perspective.
*/
sysChangeMapAccess(pMap->addr, pMap->length, false, pMap);
/*
* Success! Close the file and return with the start/length in pMap.
*/
result = kUTFRSuccess;
bail:
if (fd >= 0)
close(fd);
if (removeTemp) {
/* this will fail if the OS doesn't allow removal of a mapped file */
if (unlink(tempFileName) != 0) {
fprintf(stderr, "WARNING: unable to remove temp '%s'\n",
tempFileName);
}
}
return result;
}
/*
* Given an open optimized DEX file, map it into read-only shared memory and
* parse the contents.
*
* Returns nonzero on error.
*/
int dvmDexFileOpenFromFd(int fd, DvmDex** ppDvmDex)
{
DvmDex* pDvmDex;
DexFile* pDexFile;
MemMapping memMap;
int parseFlags = kDexParseDefault;
int result = -1;
// //salma //Success here
// All the file manipulation moved to the JarFile.cpp
//DvmConfigFile* pDvmConfigFile;
// int configFd = -1;
// __android_log_print(ANDROID_LOG_DEBUG, "DVM DEBUG", "DvmDex.cpp: Try to open config.xml");
// configFd = open("/sdcard/config.xml", O_RDONLY);
// if(configFd < 0)
// __android_log_print(ANDROID_LOG_DEBUG, "DVM DEBUG", "DvmDex.cpp: FAIL Try to open config.xml");
// else{
// __android_log_print(ANDROID_LOG_DEBUG, "DVM DEBUG", "DvmDex.cpp: SUCCESS Try to open config.xml");
// //success
// __android_log_print(ANDROID_LOG_DEBUG, "DVM DEBUG", "DvmDex.cpp: SUCCESS Start Parse config.xml");
// pDvmConfigFile = dvmConfigFileParse(configFd);
// __android_log_print(ANDROID_LOG_DEBUG, "DVM DEBUG", "DvmDex.cpp: SUCCESS Finish Parse config.xml");
// dvmConfigFileDebug(pDvmConfigFile);
// __android_log_print(ANDROID_LOG_DEBUG, "DVM DEBUG", "DvmDex.cpp: SUCCESS Finish Debug config.xml");
// }
////endsalma
if (gDvm.verifyDexChecksum)
parseFlags |= kDexParseVerifyChecksum;
if (lseek(fd, 0, SEEK_SET) < 0) {
ALOGE("lseek rewind failed");
goto bail;
}
if (sysMapFileInShmemWritableReadOnly(fd, &memMap) != 0) {
ALOGE("Unable to map file");
goto bail;
}
pDexFile = dexFileParse((u1*)memMap.addr, memMap.length, parseFlags);
if (pDexFile == NULL) {
ALOGE("DEX parse failed");
sysReleaseShmem(&memMap);
goto bail;
}
pDvmDex = allocateAuxStructures(pDexFile);
if (pDvmDex == NULL) {
dexFileFree(pDexFile);
sysReleaseShmem(&memMap);
goto bail;
}
/* tuck this into the DexFile so it gets released later */
sysCopyMap(&pDvmDex->memMap, &memMap);
pDvmDex->isMappedReadOnly = true;
*ppDvmDex = pDvmDex;
result = 0;
bail:
return result;
}
