MtpDatabase: Use actual file size instead of media database size column

Fixes problems with file transfer from device to host that can occur
if the database size value is wrong.

Bug: 6954446

Change-Id: I03c3dd4b75267d1f4613f0b588c8899ded9a70be
Signed-off-by: Mike Lockwood <lockwood@google.com>

Author: Mike Lockwood

media/java/android/mtp/MtpDatabase.java

@@ -84,20 +84,18 @@ public class MtpDatabase {
             Files.FileColumns._ID, // 0
             Files.FileColumns.DATA, // 1
     };
-    private static final String[] PATH_SIZE_FORMAT_PROJECTION = new String[] {
+    private static final String[] PATH_FORMAT_PROJECTION = new String[] {
             Files.FileColumns._ID, // 0
             Files.FileColumns.DATA, // 1
-            Files.FileColumns.SIZE, // 2
-            Files.FileColumns.FORMAT, // 3
+            Files.FileColumns.FORMAT, // 2
     };
     private static final String[] OBJECT_INFO_PROJECTION = new String[] {
             Files.FileColumns._ID, // 0
             Files.FileColumns.STORAGE_ID, // 1
             Files.FileColumns.FORMAT, // 2
             Files.FileColumns.PARENT, // 3
             Files.FileColumns.DATA, // 4
-            Files.FileColumns.SIZE, // 5
-            Files.FileColumns.DATE_MODIFIED, // 6
+            Files.FileColumns.DATE_MODIFIED, // 5
     };
     private static final String ID_WHERE = Files.FileColumns._ID + "=?";
     private static final String PATH_WHERE = Files.FileColumns.DATA + "=?";
@@ -834,7 +832,7 @@ private int setDeviceProperty(int property, long intValue, String stringValue) {
     }
 
     private boolean getObjectInfo(int handle, int[] outStorageFormatParent,
-                        char[] outName, long[] outSizeModified) {
+                        char[] outName, long[] outModified) {
         Cursor c = null;
         try {
             c = mMediaProvider.query(mObjectsUri, OBJECT_INFO_PROJECTION,
@@ -855,8 +853,7 @@ private boolean getObjectInfo(int handle, int[] outStorageFormatParent,
                 path.getChars(start, end, outName, 0);
                 outName[end - start] = 0;
 
-                outSizeModified[0] = c.getLong(5);
-                outSizeModified[1] = c.getLong(6);
+                outModified[0] = c.getLong(5);
                 return true;
             }
         } catch (RemoteException e) {
@@ -880,14 +877,16 @@ private int getObjectFilePath(int handle, char[] outFilePath, long[] outFileLeng
         }
         Cursor c = null;
         try {
-            c = mMediaProvider.query(mObjectsUri, PATH_SIZE_FORMAT_PROJECTION,
+            c = mMediaProvider.query(mObjectsUri, PATH_FORMAT_PROJECTION,
                             ID_WHERE, new String[] {  Integer.toString(handle) }, null, null);
             if (c != null && c.moveToNext()) {
                 String path = c.getString(1);
                 path.getChars(0, path.length(), outFilePath, 0);
                 outFilePath[path.length()] = 0;
-                outFileLengthFormat[0] = c.getLong(2);
-                outFileLengthFormat[1] = c.getLong(3);
+                // File transfers from device to host will likely fail if the size is incorrect.
+                // So to be safe, use the actual file size here.
+                outFileLengthFormat[0] = new File(path).length();
+                outFileLengthFormat[1] = c.getLong(2);
                 return MtpConstants.RESPONSE_OK;
             } else {
                 return MtpConstants.RESPONSE_INVALID_OBJECT_HANDLE;
@@ -909,13 +908,13 @@ private int deleteFile(int handle) {
 
         Cursor c = null;
         try {
-            c = mMediaProvider.query(mObjectsUri, PATH_SIZE_FORMAT_PROJECTION,
+            c = mMediaProvider.query(mObjectsUri, PATH_FORMAT_PROJECTION,
                             ID_WHERE, new String[] {  Integer.toString(handle) }, null, null);
             if (c != null && c.moveToNext()) {
                 // don't convert to media path here, since we will be matching
                 // against paths in the database matching /data/media
                 path = c.getString(1);
-                format = c.getInt(3);
+                format = c.getInt(2);
             } else {
                 return MtpConstants.RESPONSE_INVALID_OBJECT_HANDLE;
             }

media/jni/android_mtp_MtpDatabase.cpp

@@ -751,13 +751,22 @@ MtpResponseCode MyMtpDatabase::getObjectPropertyList(MtpObjectHandle handle,
 
 MtpResponseCode MyMtpDatabase::getObjectInfo(MtpObjectHandle handle,
                                             MtpObjectInfo& info) {
-    char    date[20];
+    char            date[20];
+    MtpString       path;
+    int64_t         length;
+    MtpObjectFormat format;
+
+    MtpResponseCode result = getObjectFilePath(handle, path, length, format);
+    if (result != MTP_RESPONSE_OK) {
+        return result;
+    }
+    info.mCompressedSize = (length > 0xFFFFFFFFLL ? 0xFFFFFFFF : (uint32_t)length);
 
     JNIEnv* env = AndroidRuntime::getJNIEnv();
-    jboolean result = env->CallBooleanMethod(mDatabase, method_getObjectInfo,
-                (jint)handle, mIntBuffer, mStringBuffer, mLongBuffer);
-    if (!result)
+    if (!env->CallBooleanMethod(mDatabase, method_getObjectInfo,
+                (jint)handle, mIntBuffer, mStringBuffer, mLongBuffer)) {
         return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
+    }
 
     jint* intValues = env->GetIntArrayElements(mIntBuffer, 0);
     info.mStorageID = intValues[0];
@@ -766,9 +775,7 @@ MtpResponseCode MyMtpDatabase::getObjectInfo(MtpObjectHandle handle,
     env->ReleaseIntArrayElements(mIntBuffer, intValues, 0);
 
     jlong* longValues = env->GetLongArrayElements(mLongBuffer, 0);
-    uint64_t size = longValues[0];
-    info.mCompressedSize = (size > 0xFFFFFFFFLL ? 0xFFFFFFFF : size);
-    info.mDateModified = longValues[1];
+    info.mDateModified = longValues[0];
     env->ReleaseLongArrayElements(mLongBuffer, longValues, 0);
 
 //    info.mAssociationType = (format == MTP_FORMAT_ASSOCIATION ?
@@ -783,28 +790,23 @@ MtpResponseCode MyMtpDatabase::getObjectInfo(MtpObjectHandle handle,
 
     // read EXIF data for thumbnail information
     if (info.mFormat == MTP_FORMAT_EXIF_JPEG || info.mFormat == MTP_FORMAT_JFIF) {
-        MtpString path;
-        int64_t length;
-        MtpObjectFormat format;
-        if (getObjectFilePath(handle, path, length, format) == MTP_RESPONSE_OK) {
-            ResetJpgfile();
-             // Start with an empty image information structure.
-            memset(&ImageInfo, 0, sizeof(ImageInfo));
-            ImageInfo.FlashUsed = -1;
-            ImageInfo.MeteringMode = -1;
-            ImageInfo.Whitebalance = -1;
-            strncpy(ImageInfo.FileName, (const char *)path, PATH_MAX);
-            if (ReadJpegFile((const char*)path, READ_METADATA)) {
-                Section_t* section = FindSection(M_EXIF);
-                if (section) {
-                    info.mThumbCompressedSize = ImageInfo.ThumbnailSize;
-                    info.mThumbFormat = MTP_FORMAT_EXIF_JPEG;
-                    info.mImagePixWidth = ImageInfo.Width;
-                    info.mImagePixHeight = ImageInfo.Height;
-                }
+        ResetJpgfile();
+         // Start with an empty image information structure.
+        memset(&ImageInfo, 0, sizeof(ImageInfo));
+        ImageInfo.FlashUsed = -1;
+        ImageInfo.MeteringMode = -1;
+        ImageInfo.Whitebalance = -1;
+        strncpy(ImageInfo.FileName, (const char *)path, PATH_MAX);
+        if (ReadJpegFile((const char*)path, READ_METADATA)) {
+            Section_t* section = FindSection(M_EXIF);
+            if (section) {
+                info.mThumbCompressedSize = ImageInfo.ThumbnailSize;
+                info.mThumbFormat = MTP_FORMAT_EXIF_JPEG;
+                info.mImagePixWidth = ImageInfo.Width;
+                info.mImagePixHeight = ImageInfo.Height;
             }
-            DiscardData();
         }
+        DiscardData();
     }
 
     checkAndClearExceptionFromCallback(env, __FUNCTION__);