core/jni/com_android_internal_content_NativeLibraryHelper.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2011 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 "NativeLibraryHelper"
 //#define LOG_NDEBUG 0

 #include <android_runtime/AndroidRuntime.h>

 #include <utils/Log.h>
 #include <androidfw/ZipFileRO.h>
 #include <ScopedUtfChars.h>

 #include <zlib.h>

 #include <fcntl.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
 #include <sys/stat.h>
 #include <sys/types.h>


 #define APK_LIB "lib/"
 #define APK_LIB_LEN (sizeof(APK_LIB) - 1)

 #define LIB_PREFIX "/lib"
 #define LIB_PREFIX_LEN (sizeof(LIB_PREFIX) - 1)

 #define LIB_SUFFIX ".so"
 #define LIB_SUFFIX_LEN (sizeof(LIB_SUFFIX) - 1)

 #define GDBSERVER "gdbserver"
 #define GDBSERVER_LEN (sizeof(GDBSERVER) - 1)

 #define TMP_FILE_PATTERN "/tmp.XXXXXX"
 #define TMP_FILE_PATTERN_LEN (sizeof(TMP_FILE_PATTERN) - 1)

 namespace android {

 // These match PackageManager.java install codes
 typedef enum {
     INSTALL_SUCCEEDED = 1,
     INSTALL_FAILED_INVALID_APK = -2,
     INSTALL_FAILED_INSUFFICIENT_STORAGE = -4,
     INSTALL_FAILED_CONTAINER_ERROR = -18,
     INSTALL_FAILED_INTERNAL_ERROR = -110,
 } install_status_t;

 typedef install_status_t (*iterFunc)(JNIEnv*, void*, ZipFileRO*, ZipEntryRO, const char*);

 // Equivalent to isFilenameSafe
 static bool
 isFilenameSafe(const char* filename)
 {
     off_t offset = 0;
     for (;;) {
         switch (*(filename + offset)) {
         case 0:
             // Null.
             // If we've reached the end, all the other characters are good.
             return true;

         case 'A' ... 'Z':
         case 'a' ... 'z':
         case '0' ... '9':
         case '+':
         case ',':
         case '-':
         case '.':
         case '/':
         case '=':
         case '_':
             offset++;
             break;

         default:
             // We found something that is not good.
             return false;
         }
     }
     // Should not reach here.
 }

 static bool
 isFileDifferent(const char* filePath, size_t fileSize, time_t modifiedTime,
         long zipCrc, struct stat64* st)
 {
     if (lstat64(filePath, st) < 0) {
         // File is not found or cannot be read.
         ALOGV("Couldn't stat %s, copying: %s\n", filePath, strerror(errno));
         return true;
     }

     if (!S_ISREG(st->st_mode)) {
         return true;
     }

     if (st->st_size != fileSize) {
         return true;
     }

     // For some reason, bionic doesn't define st_mtime as time_t
     if (time_t(st->st_mtime) != modifiedTime) {
         ALOGV("mod time doesn't match: %ld vs. %ld\n", st->st_mtime, modifiedTime);
         return true;
     }

     int fd = TEMP_FAILURE_RETRY(open(filePath, O_RDONLY));
     if (fd < 0) {
         ALOGV("Couldn't open file %s: %s", filePath, strerror(errno));
         return true;
     }

     long crc = crc32(0L, Z_NULL, 0);
     unsigned char crcBuffer[16384];
     ssize_t numBytes;
     while ((numBytes = TEMP_FAILURE_RETRY(read(fd, crcBuffer, sizeof(crcBuffer)))) > 0) {
         crc = crc32(crc, crcBuffer, numBytes);
     }
     close(fd);

     ALOGV("%s: crc = %lx, zipCrc = %lx\n", filePath, crc, zipCrc);

     if (crc != zipCrc) {
         return true;
     }

     return false;
 }

 static install_status_t
 sumFiles(JNIEnv* env, void* arg, ZipFileRO* zipFile, ZipEntryRO zipEntry, const char* fileName)
 {
     size_t* total = (size_t*) arg;
     size_t uncompLen;

     if (!zipFile->getEntryInfo(zipEntry, NULL, &uncompLen, NULL, NULL, NULL, NULL)) {
         return INSTALL_FAILED_INVALID_APK;
     }

     *total += uncompLen;

     return INSTALL_SUCCEEDED;
 }

 /*
  * Copy the native library if needed.
  *
  * This function assumes the library and path names passed in are considered safe.
  */
 static install_status_t
 copyFileIfChanged(JNIEnv *env, void* arg, ZipFileRO* zipFile, ZipEntryRO zipEntry, const char* fileName)
 {
     jstring* javaNativeLibPath = (jstring*) arg;
     ScopedUtfChars nativeLibPath(env, *javaNativeLibPath);

     size_t uncompLen;
     long when;
     long crc;
     time_t modTime;

     if (!zipFile->getEntryInfo(zipEntry, NULL, &uncompLen, NULL, NULL, &when, &crc)) {
         ALOGD("Couldn't read zip entry info\n");
         return INSTALL_FAILED_INVALID_APK;
     } else {
         struct tm t;
         ZipFileRO::zipTimeToTimespec(when, &t);
         modTime = mktime(&t);
     }

     // Build local file path
     const size_t fileNameLen = strlen(fileName);
     char localFileName[nativeLibPath.size() + fileNameLen + 2];

     if (strlcpy(localFileName, nativeLibPath.c_str(), sizeof(localFileName)) != nativeLibPath.size()) {
         ALOGD("Couldn't allocate local file name for library");
         return INSTALL_FAILED_INTERNAL_ERROR;
     }

     *(localFileName + nativeLibPath.size()) = '/';

     if (strlcpy(localFileName + nativeLibPath.size() + 1, fileName, sizeof(localFileName)
                     - nativeLibPath.size() - 1) != fileNameLen) {
         ALOGD("Couldn't allocate local file name for library");
         return INSTALL_FAILED_INTERNAL_ERROR;
     }

     // Only copy out the native file if it's different.
     struct stat st;
     if (!isFileDifferent(localFileName, uncompLen, modTime, crc, &st)) {
         return INSTALL_SUCCEEDED;
     }

     char localTmpFileName[nativeLibPath.size() + TMP_FILE_PATTERN_LEN + 2];
     if (strlcpy(localTmpFileName, nativeLibPath.c_str(), sizeof(localTmpFileName))
             != nativeLibPath.size()) {
         ALOGD("Couldn't allocate local file name for library");
         return INSTALL_FAILED_INTERNAL_ERROR;
     }

     *(localFileName + nativeLibPath.size()) = '/';

     if (strlcpy(localTmpFileName + nativeLibPath.size(), TMP_FILE_PATTERN,
                     TMP_FILE_PATTERN_LEN - nativeLibPath.size()) != TMP_FILE_PATTERN_LEN) {
         ALOGI("Couldn't allocate temporary file name for library");
         return INSTALL_FAILED_INTERNAL_ERROR;
     }

     int fd = mkstemp(localTmpFileName);
     if (fd < 0) {
         ALOGI("Couldn't open temporary file name: %s: %s\n", localTmpFileName, strerror(errno));
         return INSTALL_FAILED_CONTAINER_ERROR;
     }

     if (!zipFile->uncompressEntry(zipEntry, fd)) {
         ALOGI("Failed uncompressing %s to %s\n", fileName, localTmpFileName);
         close(fd);
         unlink(localTmpFileName);
         return INSTALL_FAILED_CONTAINER_ERROR;
     }

     close(fd);

     // Set the modification time for this file to the ZIP's mod time.
     struct timeval times[2];
     times[0].tv_sec = st.st_atime;
     times[1].tv_sec = modTime;
     times[0].tv_usec = times[1].tv_usec = 0;
     if (utimes(localTmpFileName, times) < 0) {
         ALOGI("Couldn't change modification time on %s: %s\n", localTmpFileName, strerror(errno));
         unlink(localTmpFileName);
         return INSTALL_FAILED_CONTAINER_ERROR;
     }

     // Set the mode to 755
     static const mode_t mode = S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP |  S_IXGRP | S_IROTH | S_IXOTH;
     if (chmod(localTmpFileName, mode) < 0) {
         ALOGI("Couldn't change permissions on %s: %s\n", localTmpFileName, strerror(errno));
         unlink(localTmpFileName);
         return INSTALL_FAILED_CONTAINER_ERROR;
     }

     // Finally, rename it to the final name.
     if (rename(localTmpFileName, localFileName) < 0) {
         ALOGI("Couldn't rename %s to %s: %s\n", localTmpFileName, localFileName, strerror(errno));
         unlink(localTmpFileName);
         return INSTALL_FAILED_CONTAINER_ERROR;
     }

     ALOGV("Successfully moved %s to %s\n", localTmpFileName, localFileName);

     return INSTALL_SUCCEEDED;
 }

 static install_status_t
 iterateOverNativeFiles(JNIEnv *env, jstring javaFilePath, jstring javaCpuAbi, jstring javaCpuAbi2,
         iterFunc callFunc, void* callArg) {
     ScopedUtfChars filePath(env, javaFilePath);
     ScopedUtfChars cpuAbi(env, javaCpuAbi);
     ScopedUtfChars cpuAbi2(env, javaCpuAbi2);

     ZipFileRO zipFile;

     if (zipFile.open(filePath.c_str()) != NO_ERROR) {
         ALOGI("Couldn't open APK %s\n", filePath.c_str());
         return INSTALL_FAILED_INVALID_APK;
     }

     const int N = zipFile.getNumEntries();

     char fileName[PATH_MAX];
     bool hasPrimaryAbi = false;

     for (int i = 0; i < N; i++) {
         const ZipEntryRO entry = zipFile.findEntryByIndex(i);
         if (entry == NULL) {
             continue;
         }

         // Make sure this entry has a filename.
         if (zipFile.getEntryFileName(entry, fileName, sizeof(fileName))) {
             continue;
         }

         // Make sure we're in the lib directory of the ZIP.
         if (strncmp(fileName, APK_LIB, APK_LIB_LEN)) {
             continue;
         }

         // Make sure the filename is at least to the minimum library name size.
         const size_t fileNameLen = strlen(fileName);
         static const size_t minLength = APK_LIB_LEN + 2 + LIB_PREFIX_LEN + 1 + LIB_SUFFIX_LEN;
         if (fileNameLen < minLength) {
             continue;
         }

         const char* lastSlash = strrchr(fileName, '/');
         ALOG_ASSERT(lastSlash != NULL, "last slash was null somehow for %s\n", fileName);

         // Check to make sure the CPU ABI of this file is one we support.
         const char* cpuAbiOffset = fileName + APK_LIB_LEN;
         const size_t cpuAbiRegionSize = lastSlash - cpuAbiOffset;

         ALOGV("Comparing ABIs %s and %s versus %s\n", cpuAbi.c_str(), cpuAbi2.c_str(), cpuAbiOffset);
         if (cpuAbi.size() == cpuAbiRegionSize
                 && *(cpuAbiOffset + cpuAbi.size()) == '/'
                 && !strncmp(cpuAbiOffset, cpuAbi.c_str(), cpuAbiRegionSize)) {
             ALOGV("Using primary ABI %s\n", cpuAbi.c_str());
             hasPrimaryAbi = true;
         } else if (cpuAbi2.size() == cpuAbiRegionSize
                 && *(cpuAbiOffset + cpuAbi2.size()) == '/'
                 && !strncmp(cpuAbiOffset, cpuAbi2.c_str(), cpuAbiRegionSize)) {

             /*
              * If this library matches both the primary and secondary ABIs,
              * only use the primary ABI.
              */
             if (hasPrimaryAbi) {
                 ALOGV("Already saw primary ABI, skipping secondary ABI %s\n", cpuAbi2.c_str());
                 continue;
             } else {
                 ALOGV("Using secondary ABI %s\n", cpuAbi2.c_str());
             }
         } else {
             ALOGV("abi didn't match anything: %s (end at %zd)\n", cpuAbiOffset, cpuAbiRegionSize);
             continue;
         }

         // If this is a .so file, check to see if we need to copy it.
         if ((!strncmp(fileName + fileNameLen - LIB_SUFFIX_LEN, LIB_SUFFIX, LIB_SUFFIX_LEN)
                     && !strncmp(lastSlash, LIB_PREFIX, LIB_PREFIX_LEN)
                     && isFilenameSafe(lastSlash + 1))
                 || !strncmp(lastSlash + 1, GDBSERVER, GDBSERVER_LEN)) {

             install_status_t ret = callFunc(env, callArg, &zipFile, entry, lastSlash + 1);

             if (ret != INSTALL_SUCCEEDED) {
                 ALOGV("Failure for entry %s", lastSlash + 1);
                 return ret;
             }
         }
     }

     return INSTALL_SUCCEEDED;
 }

 static jint
 com_android_internal_content_NativeLibraryHelper_copyNativeBinaries(JNIEnv *env, jclass clazz,
         jstring javaFilePath, jstring javaNativeLibPath, jstring javaCpuAbi, jstring javaCpuAbi2)
 {
     return (jint) iterateOverNativeFiles(env, javaFilePath, javaCpuAbi, javaCpuAbi2,
             copyFileIfChanged, &javaNativeLibPath);
 }

 static jlong
 com_android_internal_content_NativeLibraryHelper_sumNativeBinaries(JNIEnv *env, jclass clazz,
         jstring javaFilePath, jstring javaCpuAbi, jstring javaCpuAbi2)
 {
     size_t totalSize = 0;

     iterateOverNativeFiles(env, javaFilePath, javaCpuAbi, javaCpuAbi2, sumFiles, &totalSize);

     return totalSize;
 }

 static JNINativeMethod gMethods[] = {
     {"nativeCopyNativeBinaries",
             "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)I",
             (void *)com_android_internal_content_NativeLibraryHelper_copyNativeBinaries},
     {"nativeSumNativeBinaries",
             "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)J",
             (void *)com_android_internal_content_NativeLibraryHelper_sumNativeBinaries},
 };


 int register_com_android_internal_content_NativeLibraryHelper(JNIEnv *env)
 {
     return AndroidRuntime::registerNativeMethods(env,
                 "com/android/internal/content/NativeLibraryHelper", gMethods, NELEM(gMethods));
 }

 };
	/*
	* Copyright (C) 2011 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 "NativeLibraryHelper"
	//#define LOG_NDEBUG 0

	#include <android_runtime/AndroidRuntime.h>

	#include <utils/Log.h>
	#include <androidfw/ZipFileRO.h>
	#include <ScopedUtfChars.h>

	#include <zlib.h>

	#include <fcntl.h>
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>
	#include <unistd.h>
	#include <sys/stat.h>
	#include <sys/types.h>


	#define APK_LIB "lib/"
	#define APK_LIB_LEN (sizeof(APK_LIB) - 1)

	#define LIB_PREFIX "/lib"
	#define LIB_PREFIX_LEN (sizeof(LIB_PREFIX) - 1)

	#define LIB_SUFFIX ".so"
	#define LIB_SUFFIX_LEN (sizeof(LIB_SUFFIX) - 1)

	#define GDBSERVER "gdbserver"
	#define GDBSERVER_LEN (sizeof(GDBSERVER) - 1)

	#define TMP_FILE_PATTERN "/tmp.XXXXXX"
	#define TMP_FILE_PATTERN_LEN (sizeof(TMP_FILE_PATTERN) - 1)

	namespace android {

	// These match PackageManager.java install codes
	typedef enum {
	INSTALL_SUCCEEDED = 1,
	INSTALL_FAILED_INVALID_APK = -2,
	INSTALL_FAILED_INSUFFICIENT_STORAGE = -4,
	INSTALL_FAILED_CONTAINER_ERROR = -18,
	INSTALL_FAILED_INTERNAL_ERROR = -110,
	} install_status_t;

	typedef install_status_t (iterFunc)(JNIEnv, void, ZipFileRO, ZipEntryRO, const char*);

	// Equivalent to isFilenameSafe
	static bool
	isFilenameSafe(const char* filename)
	{
	off_t offset = 0;
	for (;;) {
	switch (*(filename + offset)) {
	case 0:
	// Null.
	// If we've reached the end, all the other characters are good.
	return true;

	case 'A' ... 'Z':
	case 'a' ... 'z':
	case '0' ... '9':
	case '+':
	case ',':
	case '-':
	case '.':
	case '/':
	case '=':
	case '_':
	offset++;
	break;

	default:
	// We found something that is not good.
	return false;
	}
	}
	// Should not reach here.
	}

	static bool
	isFileDifferent(const char* filePath, size_t fileSize, time_t modifiedTime,
	long zipCrc, struct stat64* st)
	{
	if (lstat64(filePath, st) < 0) {
	// File is not found or cannot be read.
	ALOGV("Couldn't stat %s, copying: %s\n", filePath, strerror(errno));
	return true;
	}

	if (!S_ISREG(st->st_mode)) {
	return true;
	}

	if (st->st_size != fileSize) {
	return true;
	}

	// For some reason, bionic doesn't define st_mtime as time_t
	if (time_t(st->st_mtime) != modifiedTime) {
	ALOGV("mod time doesn't match: %ld vs. %ld\n", st->st_mtime, modifiedTime);
	return true;
	}

	int fd = TEMP_FAILURE_RETRY(open(filePath, O_RDONLY));
	if (fd < 0) {
	ALOGV("Couldn't open file %s: %s", filePath, strerror(errno));
	return true;
	}

	long crc = crc32(0L, Z_NULL, 0);
	unsigned char crcBuffer[16384];
	ssize_t numBytes;
	while ((numBytes = TEMP_FAILURE_RETRY(read(fd, crcBuffer, sizeof(crcBuffer)))) > 0) {
	crc = crc32(crc, crcBuffer, numBytes);
	}
	close(fd);

	ALOGV("%s: crc = %lx, zipCrc = %lx\n", filePath, crc, zipCrc);

	if (crc != zipCrc) {
	return true;
	}

	return false;
	}

	static install_status_t
	sumFiles(JNIEnv* env, void* arg, ZipFileRO* zipFile, ZipEntryRO zipEntry, const char* fileName)
	{
	size_t* total = (size_t*) arg;
	size_t uncompLen;

	if (!zipFile->getEntryInfo(zipEntry, NULL, &uncompLen, NULL, NULL, NULL, NULL)) {
	return INSTALL_FAILED_INVALID_APK;
	}

	*total += uncompLen;

	return INSTALL_SUCCEEDED;
	}

	/*
	* Copy the native library if needed.
	*
	* This function assumes the library and path names passed in are considered safe.
	*/
	static install_status_t
	copyFileIfChanged(JNIEnv env, void arg, ZipFileRO* zipFile, ZipEntryRO zipEntry, const char* fileName)
	{
	jstring* javaNativeLibPath = (jstring*) arg;
	ScopedUtfChars nativeLibPath(env, *javaNativeLibPath);

	size_t uncompLen;
	long when;
	long crc;
	time_t modTime;

	if (!zipFile->getEntryInfo(zipEntry, NULL, &uncompLen, NULL, NULL, &when, &crc)) {
	ALOGD("Couldn't read zip entry info\n");
	return INSTALL_FAILED_INVALID_APK;
	} else {
	struct tm t;
	ZipFileRO::zipTimeToTimespec(when, &t);
	modTime = mktime(&t);
	}

	// Build local file path
	const size_t fileNameLen = strlen(fileName);
	char localFileName[nativeLibPath.size() + fileNameLen + 2];

	if (strlcpy(localFileName, nativeLibPath.c_str(), sizeof(localFileName)) != nativeLibPath.size()) {
	ALOGD("Couldn't allocate local file name for library");
	return INSTALL_FAILED_INTERNAL_ERROR;
	}

	*(localFileName + nativeLibPath.size()) = '/';

	if (strlcpy(localFileName + nativeLibPath.size() + 1, fileName, sizeof(localFileName)
	- nativeLibPath.size() - 1) != fileNameLen) {
	ALOGD("Couldn't allocate local file name for library");
	return INSTALL_FAILED_INTERNAL_ERROR;
	}

	// Only copy out the native file if it's different.
	struct stat st;
	if (!isFileDifferent(localFileName, uncompLen, modTime, crc, &st)) {
	return INSTALL_SUCCEEDED;
	}

	char localTmpFileName[nativeLibPath.size() + TMP_FILE_PATTERN_LEN + 2];
	if (strlcpy(localTmpFileName, nativeLibPath.c_str(), sizeof(localTmpFileName))
	!= nativeLibPath.size()) {
	ALOGD("Couldn't allocate local file name for library");
	return INSTALL_FAILED_INTERNAL_ERROR;
	}

	*(localFileName + nativeLibPath.size()) = '/';

	if (strlcpy(localTmpFileName + nativeLibPath.size(), TMP_FILE_PATTERN,
	TMP_FILE_PATTERN_LEN - nativeLibPath.size()) != TMP_FILE_PATTERN_LEN) {
	ALOGI("Couldn't allocate temporary file name for library");
	return INSTALL_FAILED_INTERNAL_ERROR;
	}

	int fd = mkstemp(localTmpFileName);
	if (fd < 0) {
	ALOGI("Couldn't open temporary file name: %s: %s\n", localTmpFileName, strerror(errno));
	return INSTALL_FAILED_CONTAINER_ERROR;
	}

	if (!zipFile->uncompressEntry(zipEntry, fd)) {
	ALOGI("Failed uncompressing %s to %s\n", fileName, localTmpFileName);
	close(fd);
	unlink(localTmpFileName);
	return INSTALL_FAILED_CONTAINER_ERROR;
	}

	close(fd);

	// Set the modification time for this file to the ZIP's mod time.
	struct timeval times[2];
	times[0].tv_sec = st.st_atime;
	times[1].tv_sec = modTime;
	times[0].tv_usec = times[1].tv_usec = 0;
	if (utimes(localTmpFileName, times) < 0) {
	ALOGI("Couldn't change modification time on %s: %s\n", localTmpFileName, strerror(errno));
	unlink(localTmpFileName);
	return INSTALL_FAILED_CONTAINER_ERROR;
	}

	// Set the mode to 755
	static const mode_t mode = S_IRUSR \| S_IWUSR \| S_IXUSR \| S_IRGRP \| S_IXGRP \| S_IROTH \| S_IXOTH;
	if (chmod(localTmpFileName, mode) < 0) {
	ALOGI("Couldn't change permissions on %s: %s\n", localTmpFileName, strerror(errno));
	unlink(localTmpFileName);
	return INSTALL_FAILED_CONTAINER_ERROR;
	}

	// Finally, rename it to the final name.
	if (rename(localTmpFileName, localFileName) < 0) {
	ALOGI("Couldn't rename %s to %s: %s\n", localTmpFileName, localFileName, strerror(errno));
	unlink(localTmpFileName);
	return INSTALL_FAILED_CONTAINER_ERROR;
	}

	ALOGV("Successfully moved %s to %s\n", localTmpFileName, localFileName);

	return INSTALL_SUCCEEDED;
	}

	static install_status_t
	iterateOverNativeFiles(JNIEnv *env, jstring javaFilePath, jstring javaCpuAbi, jstring javaCpuAbi2,
	iterFunc callFunc, void* callArg) {
	ScopedUtfChars filePath(env, javaFilePath);
	ScopedUtfChars cpuAbi(env, javaCpuAbi);
	ScopedUtfChars cpuAbi2(env, javaCpuAbi2);

	ZipFileRO zipFile;

	if (zipFile.open(filePath.c_str()) != NO_ERROR) {
	ALOGI("Couldn't open APK %s\n", filePath.c_str());
	return INSTALL_FAILED_INVALID_APK;
	}

	const int N = zipFile.getNumEntries();

	char fileName[PATH_MAX];
	bool hasPrimaryAbi = false;

	for (int i = 0; i < N; i++) {
	const ZipEntryRO entry = zipFile.findEntryByIndex(i);
	if (entry == NULL) {
	continue;
	}

	// Make sure this entry has a filename.
	if (zipFile.getEntryFileName(entry, fileName, sizeof(fileName))) {
	continue;
	}

	// Make sure we're in the lib directory of the ZIP.
	if (strncmp(fileName, APK_LIB, APK_LIB_LEN)) {
	continue;
	}

	// Make sure the filename is at least to the minimum library name size.
	const size_t fileNameLen = strlen(fileName);
	static const size_t minLength = APK_LIB_LEN + 2 + LIB_PREFIX_LEN + 1 + LIB_SUFFIX_LEN;
	if (fileNameLen < minLength) {
	continue;
	}

	const char* lastSlash = strrchr(fileName, '/');
	ALOG_ASSERT(lastSlash != NULL, "last slash was null somehow for %s\n", fileName);

	// Check to make sure the CPU ABI of this file is one we support.
	const char* cpuAbiOffset = fileName + APK_LIB_LEN;
	const size_t cpuAbiRegionSize = lastSlash - cpuAbiOffset;

	ALOGV("Comparing ABIs %s and %s versus %s\n", cpuAbi.c_str(), cpuAbi2.c_str(), cpuAbiOffset);
	if (cpuAbi.size() == cpuAbiRegionSize
	&& *(cpuAbiOffset + cpuAbi.size()) == '/'
	&& !strncmp(cpuAbiOffset, cpuAbi.c_str(), cpuAbiRegionSize)) {
	ALOGV("Using primary ABI %s\n", cpuAbi.c_str());
	hasPrimaryAbi = true;
	} else if (cpuAbi2.size() == cpuAbiRegionSize
	&& *(cpuAbiOffset + cpuAbi2.size()) == '/'
	&& !strncmp(cpuAbiOffset, cpuAbi2.c_str(), cpuAbiRegionSize)) {

	/*
	* If this library matches both the primary and secondary ABIs,
	* only use the primary ABI.
	*/
	if (hasPrimaryAbi) {
	ALOGV("Already saw primary ABI, skipping secondary ABI %s\n", cpuAbi2.c_str());
	continue;
	} else {
	ALOGV("Using secondary ABI %s\n", cpuAbi2.c_str());
	}
	} else {
	ALOGV("abi didn't match anything: %s (end at %zd)\n", cpuAbiOffset, cpuAbiRegionSize);
	continue;
	}

	// If this is a .so file, check to see if we need to copy it.
	if ((!strncmp(fileName + fileNameLen - LIB_SUFFIX_LEN, LIB_SUFFIX, LIB_SUFFIX_LEN)
	&& !strncmp(lastSlash, LIB_PREFIX, LIB_PREFIX_LEN)
	&& isFilenameSafe(lastSlash + 1))
	\|\| !strncmp(lastSlash + 1, GDBSERVER, GDBSERVER_LEN)) {

	install_status_t ret = callFunc(env, callArg, &zipFile, entry, lastSlash + 1);

	if (ret != INSTALL_SUCCEEDED) {
	ALOGV("Failure for entry %s", lastSlash + 1);
	return ret;
	}
	}
	}

	return INSTALL_SUCCEEDED;
	}

	static jint
	com_android_internal_content_NativeLibraryHelper_copyNativeBinaries(JNIEnv *env, jclass clazz,
	jstring javaFilePath, jstring javaNativeLibPath, jstring javaCpuAbi, jstring javaCpuAbi2)
	{
	return (jint) iterateOverNativeFiles(env, javaFilePath, javaCpuAbi, javaCpuAbi2,
	copyFileIfChanged, &javaNativeLibPath);
	}

	static jlong
	com_android_internal_content_NativeLibraryHelper_sumNativeBinaries(JNIEnv *env, jclass clazz,
	jstring javaFilePath, jstring javaCpuAbi, jstring javaCpuAbi2)
	{
	size_t totalSize = 0;

	iterateOverNativeFiles(env, javaFilePath, javaCpuAbi, javaCpuAbi2, sumFiles, &totalSize);

	return totalSize;
	}

	static JNINativeMethod gMethods[] = {
	{"nativeCopyNativeBinaries",
	"(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)I",
	(void *)com_android_internal_content_NativeLibraryHelper_copyNativeBinaries},
	{"nativeSumNativeBinaries",
	"(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)J",
	(void *)com_android_internal_content_NativeLibraryHelper_sumNativeBinaries},
	};


	int register_com_android_internal_content_NativeLibraryHelper(JNIEnv *env)
	{
	return AndroidRuntime::registerNativeMethods(env,
	"com/android/internal/content/NativeLibraryHelper", gMethods, NELEM(gMethods));
	}

	};