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103 changes: 103 additions & 0 deletions
103
app/src/main/java/com/madeinhk/utils/DatabaseMigrationUtil.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package com.madeinhk.utils; | ||
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| import android.content.Context; | ||
|
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| import com.madeinhk.model.DictionaryDatabaseHelper; | ||
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| import java.io.BufferedInputStream; | ||
| import java.io.BufferedReader; | ||
| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.FileOutputStream; | ||
| import java.io.FileReader; | ||
| import java.io.IOException; | ||
| import java.util.Arrays; | ||
|
|
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| public class DatabaseMigrationUtil { | ||
| final static byte[] SQLITE_HEADER = {0x53, 0x51, 0x4c, 0x69, 0x74, 0x65, 0x20, 0x66, 0x6f, 0x72, | ||
| 0x6d, | ||
| 0x61, 0x74, 0x20, 0x33, 0x00}; | ||
| final static byte[] DECRYPT_MAPPING = | ||
| {-85, -93, -6, 121, 62, 43, 77, 112, 74, 3, -77, -44, -75, 90, 104, 53, -74, 12, 35, | ||
| -94, 20, -31, -71, -124, -7, 116, -37, -116, -88, -103, -13, 97, 16, -8, -67, | ||
| 122, -61, -97, 48, -114, 0, -20, -113, 28, 40, 49, 60, 78, -99, -59, 64, 92, 29, | ||
| -128, 93, -34, -19, 113, -1, 84, 108, 76, 17, -125, -35, -4, 42, 19, 72, 8, -65, | ||
| -123, 18, -21, 56, 9, -84, -24, -22, -47, 123, -49, 2, -9, -45, 89, 79, -28, | ||
| 114, 91, 23, -48, -38, 5, 101, 71, -11, -80, 110, -127, -110, -95, 117, 22, 37, | ||
| 15, -23, 118, -32, -3, -72, -81, 75, -64, 103, 52, -25, 67, -111, 115, -115, 31, | ||
| 54, 109, 45, -66, -50, -54, -29, 106, 107, 68, 51, 120, 98, 111, 102, -119, 127, | ||
| 50, -68, -12, -58, 30, 66, -17, -83, -126, 36, 63, 69, -63, 39, -2, -16, 1, 32, | ||
| -26, -60, -96, -92, -52, -101, -89, 94, 26, 61, 33, -15, -40, -100, 59, -108, | ||
| 47, -117, 81, 100, -82, 38, -53, 21, -70, -121, 13, -90, 70, -112, 10, -41, -30, | ||
| -118, 85, 6, -5, 126, -104, 34, 87, -87, -107, -78, -36, -43, 73, 95, 83, -106, | ||
| -10, -55, 57, -57, 4, -86, -62, -39, -27, 80, 86, -122, 11, 96, -46, -98, -109, | ||
| 82, -69, 46, 124, 55, -42, 7, 99, 24, 105, 58, -120, 25, -79, -102, -56, 65, 44, | ||
| -76, 88, -73, -18, 119, 41, -105, -33, -51, 27, -91, -14, 14, 125}; | ||
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| private static boolean isMigrationNeeded(Context context) { | ||
| File databaseFile = context.getDatabasePath(DictionaryDatabaseHelper.DATABASE_NAME); | ||
| if (!databaseFile.exists()) { | ||
| return false; | ||
| } | ||
| FileInputStream fis = null; | ||
| try { | ||
| fis = new FileInputStream(databaseFile); | ||
| byte[] header = new byte[16]; | ||
| fis.read(header); | ||
| boolean same = Arrays.equals(SQLITE_HEADER, header); | ||
| return !same; | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } finally { | ||
| if (fis != null) { | ||
| try { | ||
| fis.close(); | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
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| public static void maybeMigrate(Context context) { | ||
| if (isMigrationNeeded(context)) { | ||
| File databaseFile = context.getDatabasePath(DictionaryDatabaseHelper.DATABASE_NAME); | ||
| File tempFile = new File(context.getCacheDir(), "database.tmp"); | ||
| BufferedInputStream bis = null; | ||
| FileOutputStream fileOutputStream = null; | ||
| try { | ||
| bis = new BufferedInputStream(new FileInputStream(databaseFile)); | ||
| fileOutputStream = new FileOutputStream(tempFile); | ||
| int byteRead; | ||
| byte[] buffer = new byte[8192]; | ||
| while ((byteRead = bis.read(buffer)) > 0) { | ||
| for (int i = 0; i < byteRead; i++) { | ||
| final int index = buffer[i] & 0xFF; | ||
| buffer[i] = DECRYPT_MAPPING[index]; | ||
| } | ||
| fileOutputStream.write(buffer, 0, byteRead); | ||
| } | ||
| } catch (IOException ex) { | ||
| databaseFile.delete(); | ||
| } finally { | ||
| if (bis != null) { | ||
| try { | ||
| bis.close(); | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| if (fileOutputStream != null) { | ||
| try { | ||
| fileOutputStream.close(); | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| } | ||
| tempFile.renameTo(databaseFile); | ||
| } | ||
| } | ||
|
|
||
| } |