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-rw-r--r--core/java/android/content/res/ObbInfo.java24
-rw-r--r--core/java/android/os/storage/StorageManager.java4
-rw-r--r--core/jni/android_content_res_ObbScanner.cpp3
-rw-r--r--include/utils/ObbFile.h35
-rw-r--r--libs/utils/ObbFile.cpp32
-rw-r--r--tools/obbtool/Main.cpp21
6 files changed, 91 insertions, 28 deletions
diff --git a/core/java/android/content/res/ObbInfo.java b/core/java/android/content/res/ObbInfo.java
index b18d784..838c5ff 100644
--- a/core/java/android/content/res/ObbInfo.java
+++ b/core/java/android/content/res/ObbInfo.java
@@ -25,6 +25,9 @@ import android.os.Parcelable;
* @hide
*/
public class ObbInfo implements Parcelable {
+ /** Flag noting that this OBB is an overlay patch for a base OBB. */
+ public static final int OBB_OVERLAY = 1 << 0;
+
/**
* The name of the package to which the OBB file belongs.
*/
@@ -35,13 +38,26 @@ public class ObbInfo implements Parcelable {
*/
public int version;
+ /**
+ * The flags relating to the OBB.
+ */
+ public int flags;
+
public ObbInfo() {
}
public String toString() {
- return "ObbInfo{"
- + Integer.toHexString(System.identityHashCode(this))
- + " packageName=" + packageName + ",version=" + version + "}";
+ StringBuilder sb = new StringBuilder();
+ sb.append("ObbInfo{");
+ sb.append(Integer.toHexString(System.identityHashCode(this)));
+ sb.append(" packageName=");
+ sb.append(packageName);
+ sb.append(",version=");
+ sb.append(version);
+ sb.append(",flags=");
+ sb.append(flags);
+ sb.append('}');
+ return sb.toString();
}
public int describeContents() {
@@ -51,6 +67,7 @@ public class ObbInfo implements Parcelable {
public void writeToParcel(Parcel dest, int parcelableFlags) {
dest.writeString(packageName);
dest.writeInt(version);
+ dest.writeInt(flags);
}
public static final Parcelable.Creator<ObbInfo> CREATOR
@@ -67,5 +84,6 @@ public class ObbInfo implements Parcelable {
private ObbInfo(Parcel source) {
packageName = source.readString();
version = source.readInt();
+ flags = source.readInt();
}
}
diff --git a/core/java/android/os/storage/StorageManager.java b/core/java/android/os/storage/StorageManager.java
index cb1794f..df0b69c 100644
--- a/core/java/android/os/storage/StorageManager.java
+++ b/core/java/android/os/storage/StorageManager.java
@@ -304,6 +304,8 @@ public class StorageManager
* file matches a package ID that is owned by the calling program's UID.
* That is, shared UID applications can obtain access to any other
* application's OBB that shares its UID.
+ * <p>
+ * STOPSHIP document more; discuss lack of guarantees of security
*
* @param filename the path to the OBB file
* @param key decryption key
@@ -328,6 +330,8 @@ public class StorageManager
* file matches a package ID that is owned by the calling program's UID.
* That is, shared UID applications can obtain access to any other
* application's OBB that shares its UID.
+ * <p>
+ * STOPSHIP document more; discuss lack of guarantees of security
*
* @param filename path to the OBB file
* @param force whether to kill any programs using this in order to unmount
diff --git a/core/jni/android_content_res_ObbScanner.cpp b/core/jni/android_content_res_ObbScanner.cpp
index 1239274..62c89fc 100644
--- a/core/jni/android_content_res_ObbScanner.cpp
+++ b/core/jni/android_content_res_ObbScanner.cpp
@@ -31,6 +31,7 @@ static struct {
jfieldID packageName;
jfieldID version;
+ jfieldID flags;
} gObbInfoClassInfo;
static jboolean android_content_res_ObbScanner_getObbInfo(JNIEnv* env, jobject clazz, jstring file,
@@ -85,6 +86,8 @@ int register_android_content_res_ObbScanner(JNIEnv* env)
"packageName", "Ljava/lang/String;");
GET_FIELD_ID(gObbInfoClassInfo.version, gObbInfoClassInfo.clazz,
"version", "I");
+ GET_FIELD_ID(gObbInfoClassInfo.flags, gObbInfoClassInfo.clazz,
+ "flags", "I");
return AndroidRuntime::registerNativeMethods(env, "android/content/res/ObbScanner", gMethods,
NELEM(gMethods));
diff --git a/include/utils/ObbFile.h b/include/utils/ObbFile.h
index d2ca82e..5243f50 100644
--- a/include/utils/ObbFile.h
+++ b/include/utils/ObbFile.h
@@ -18,12 +18,16 @@
#define OBBFILE_H_
#include <stdint.h>
+#include <strings.h>
#include <utils/RefBase.h>
#include <utils/String8.h>
namespace android {
+// OBB flags (bit 0)
+#define OBB_OVERLAY (1 << 0)
+
class ObbFile : public RefBase {
protected:
virtual ~ObbFile();
@@ -46,18 +50,38 @@ public:
return mPackageName;
}
- int32_t getVersion() const {
- return mVersion;
- }
-
void setPackageName(String8 packageName) {
mPackageName = packageName;
}
+ int32_t getVersion() const {
+ return mVersion;
+ }
+
void setVersion(int32_t version) {
mVersion = version;
}
+ int32_t getFlags() const {
+ return mFlags;
+ }
+
+ void setFlags(int32_t flags) {
+ mFlags = flags;
+ }
+
+ bool isOverlay() {
+ return (mFlags & OBB_OVERLAY) == OBB_OVERLAY;
+ }
+
+ void setOverlay(bool overlay) {
+ if (overlay) {
+ mFlags |= OBB_OVERLAY;
+ } else {
+ mFlags &= ~OBB_OVERLAY;
+ }
+ }
+
static inline uint32_t get4LE(const unsigned char* buf) {
return buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
}
@@ -76,6 +100,9 @@ private:
/* Package version this ObbFile is associated with */
int32_t mVersion;
+ /* Flags for this OBB type. */
+ int32_t mFlags;
+
const char* mFileName;
size_t mFileSize;
diff --git a/libs/utils/ObbFile.cpp b/libs/utils/ObbFile.cpp
index adedf0c..e170ab8 100644
--- a/libs/utils/ObbFile.cpp
+++ b/libs/utils/ObbFile.cpp
@@ -29,12 +29,13 @@
#define kFooterTagSize 8 /* last two 32-bit integers */
-#define kFooterMinSize 21 /* 32-bit signature version
- * 32-bit package version
- * 32-bit package name size
- * 1-character package name
- * 32-bit footer size
- * 32-bit footer marker
+#define kFooterMinSize 25 /* 32-bit signature version (4 bytes)
+ * 32-bit package version (4 bytes)
+ * 32-bit flags (4 bytes)
+ * 32-bit package name size (4-bytes)
+ * >=1-character package name (1 byte)
+ * 32-bit footer size (4 bytes)
+ * 32-bit footer marker (4 bytes)
*/
#define kMaxBufSize 32768 /* Maximum file read buffer */
@@ -45,8 +46,9 @@
/* offsets in version 1 of the header */
#define kPackageVersionOffset 4
-#define kPackageNameLenOffset 8
-#define kPackageNameOffset 12
+#define kFlagsOffset 8
+#define kPackageNameLenOffset 12
+#define kPackageNameOffset 16
/*
* TEMP_FAILURE_RETRY is defined by some, but not all, versions of
@@ -78,7 +80,10 @@ typedef off64_t my_off64_t;
namespace android {
ObbFile::ObbFile() :
- mVersion(-1) {
+ mPackageName(""),
+ mVersion(-1),
+ mFlags(0)
+{
}
ObbFile::~ObbFile() {
@@ -199,6 +204,7 @@ bool ObbFile::parseObbFile(int fd)
}
mVersion = (int32_t) get4LE((unsigned char*)scanBuf + kPackageVersionOffset);
+ mFlags = (int32_t) get4LE((unsigned char*)scanBuf + kFlagsOffset);
uint32_t packageNameLen = get4LE((unsigned char*)scanBuf + kPackageNameLenOffset);
if (packageNameLen <= 0
@@ -268,6 +274,12 @@ bool ObbFile::writeTo(int fd)
return false;
}
+ put4LE(intBuf, mFlags);
+ if (write(fd, &intBuf, sizeof(uint32_t)) != (ssize_t)sizeof(uint32_t)) {
+ LOGW("couldn't write package version");
+ return false;
+ }
+
size_t packageNameLen = mPackageName.size();
put4LE(intBuf, packageNameLen);
if (write(fd, &intBuf, sizeof(uint32_t)) != (ssize_t)sizeof(uint32_t)) {
@@ -280,7 +292,7 @@ bool ObbFile::writeTo(int fd)
return false;
}
- put4LE(intBuf, 3*sizeof(uint32_t) + packageNameLen);
+ put4LE(intBuf, kPackageNameOffset + packageNameLen);
if (write(fd, &intBuf, sizeof(uint32_t)) != (ssize_t)sizeof(uint32_t)) {
LOGW("couldn't write footer size: %s", strerror(errno));
return false;
diff --git a/tools/obbtool/Main.cpp b/tools/obbtool/Main.cpp
index 2a9bf04..49e077f 100644
--- a/tools/obbtool/Main.cpp
+++ b/tools/obbtool/Main.cpp
@@ -29,7 +29,7 @@ static const char* gProgVersion = "1.0";
static int wantUsage = 0;
static int wantVersion = 0;
-#define ADD_OPTS "n:v:f:c:"
+#define ADD_OPTS "n:v:o"
static const struct option longopts[] = {
{"help", no_argument, &wantUsage, 1},
{"version", no_argument, &wantVersion, 1},
@@ -37,8 +37,7 @@ static const struct option longopts[] = {
/* Args for "add" */
{"name", required_argument, NULL, 'n'},
{"version", required_argument, NULL, 'v'},
- {"filesystem", required_argument, NULL, 'f'},
- {"crypto", required_argument, NULL, 'c'},
+ {"overlay", optional_argument, NULL, 'o'},
{NULL, 0, NULL, '\0'}
};
@@ -46,8 +45,7 @@ static const struct option longopts[] = {
struct package_info_t {
char* packageName;
int packageVersion;
- char* filesystem;
- char* crypto;
+ bool overlay;
};
/*
@@ -77,6 +75,7 @@ void doAdd(const char* filename, struct package_info_t* info) {
obb->setPackageName(String8(info->packageName));
obb->setVersion(info->packageVersion);
+ obb->setOverlay(info->overlay);
if (!obb->writeTo(filename)) {
fprintf(stderr, "ERROR: %s: couldn't write OBB signature: %s\n",
@@ -112,6 +111,8 @@ void doInfo(const char* filename) {
printf("OBB info for '%s':\n", filename);
printf("Package name: %s\n", obb->getPackageName().string());
printf(" Version: %d\n", obb->getVersion());
+ printf(" Flags: 0x%08x\n", obb->getFlags());
+ printf(" Overlay: %s\n", obb->isOverlay() ? "true" : "false");
}
/*
@@ -143,7 +144,7 @@ int main(int argc, char* const argv[])
case 'n':
package_info.packageName = optarg;
break;
- case 'v':
+ case 'v': {
char *end;
package_info.packageVersion = strtol(optarg, &end, 10);
if (*optarg == '\0' || *end != '\0') {
@@ -152,11 +153,9 @@ int main(int argc, char* const argv[])
goto bail;
}
break;
- case 'f':
- package_info.filesystem = optarg;
- break;
- case 'c':
- package_info.crypto = optarg;
+ }
+ case 'o':
+ package_info.overlay = true;
break;
case '?':
wantUsage = 1;
generated by cgit v1.1 at 2024-09-17 11:14:55 +0000