diff options
Diffstat (limited to 'src/java/com/healthmarketscience/jackcess/JetFormat.java')
| -rw-r--r-- | src/java/com/healthmarketscience/jackcess/JetFormat.java | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/src/java/com/healthmarketscience/jackcess/JetFormat.java b/src/java/com/healthmarketscience/jackcess/JetFormat.java index 8041dbb..4beb69e 100644 --- a/src/java/com/healthmarketscience/jackcess/JetFormat.java +++ b/src/java/com/healthmarketscience/jackcess/JetFormat.java @@ -59,6 +59,31 @@ public abstract class JetFormat { /** Version code for Jet version 5 */ private static final byte CODE_VERSION_5 = 0x2; + /** mask used to obfuscate the db header */ + private static final byte[] BASE_HEADER_MASK = new byte[]{ + (byte)0xB5, (byte)0x6F, (byte)0x03, (byte)0x62, (byte)0x61, (byte)0x08, + (byte)0xC2, (byte)0x55, (byte)0xEB, (byte)0xA9, (byte)0x67, (byte)0x72, + (byte)0x43, (byte)0x3F, (byte)0x00, (byte)0x9C, (byte)0x7A, (byte)0x9F, + (byte)0x90, (byte)0xFF, (byte)0x80, (byte)0x9A, (byte)0x31, (byte)0xC5, + (byte)0x79, (byte)0xBA, (byte)0xED, (byte)0x30, (byte)0xBC, (byte)0xDF, + (byte)0xCC, (byte)0x9D, (byte)0x63, (byte)0xD9, (byte)0xE4, (byte)0xC3, + (byte)0x7B, (byte)0x42, (byte)0xFB, (byte)0x8A, (byte)0xBC, (byte)0x4E, + (byte)0x86, (byte)0xFB, (byte)0xEC, (byte)0x37, (byte)0x5D, (byte)0x44, + (byte)0x9C, (byte)0xFA, (byte)0xC6, (byte)0x5E, (byte)0x28, (byte)0xE6, + (byte)0x13, (byte)0xB6, (byte)0x8A, (byte)0x60, (byte)0x54, (byte)0x94, + (byte)0x7B, (byte)0x36, (byte)0xF5, (byte)0x72, (byte)0xDF, (byte)0xB1, + (byte)0x77, (byte)0xF4, (byte)0x13, (byte)0x43, (byte)0xCF, (byte)0xAF, + (byte)0xB1, (byte)0x33, (byte)0x34, (byte)0x61, (byte)0x79, (byte)0x5B, + (byte)0x92, (byte)0xB5, (byte)0x7C, (byte)0x2A, (byte)0x05, (byte)0xF1, + (byte)0x7C, (byte)0x99, (byte)0x01, (byte)0x1B, (byte)0x98, (byte)0xFD, + (byte)0x12, (byte)0x4F, (byte)0x4A, (byte)0x94, (byte)0x6C, (byte)0x3E, + (byte)0x60, (byte)0x26, (byte)0x5F, (byte)0x95, (byte)0xF8, (byte)0xD0, + (byte)0x89, (byte)0x24, (byte)0x85, (byte)0x67, (byte)0xC6, (byte)0x1F, + (byte)0x27, (byte)0x44, (byte)0xD2, (byte)0xEE, (byte)0xCF, (byte)0x65, + (byte)0xED, (byte)0xFF, (byte)0x07, (byte)0xC7, (byte)0x46, (byte)0xA1, + (byte)0x78, (byte)0x16, (byte)0x0C, (byte)0xED, (byte)0xE9, (byte)0x2D, + (byte)0x62, (byte)0xD4}; + /** value of the "AccessVersion" property for access 2000 dbs: {@code "08.50"} */ private static final byte[] ACCESS_VERSION_2000 = new byte[] { @@ -104,7 +129,12 @@ public abstract class JetFormat { public final int MAX_ROW_SIZE; public final int PAGE_INITIAL_FREE_SPACE; - + + public final int OFFSET_MASKED_HEADER; + public final byte[] HEADER_MASK; + public final int OFFSET_HEADER_DATE; + public final int OFFSET_PASSWORD; + public final int SIZE_PASSWORD; public final int OFFSET_NEXT_TABLE_DEF_PAGE; public final int OFFSET_NUM_ROWS; public final int OFFSET_NEXT_AUTO_NUMBER; @@ -221,6 +251,11 @@ public abstract class JetFormat { MAX_ROW_SIZE = defineMaxRowSize(); PAGE_INITIAL_FREE_SPACE = definePageInitialFreeSpace(); + OFFSET_MASKED_HEADER = defineOffsetMaskedHeader(); + HEADER_MASK = defineHeaderMask(); + OFFSET_HEADER_DATE = defineOffsetHeaderDate(); + OFFSET_PASSWORD = defineOffsetPassword(); + SIZE_PASSWORD = defineSizePassword(); OFFSET_NEXT_TABLE_DEF_PAGE = defineOffsetNextTableDefPage(); OFFSET_NUM_ROWS = defineOffsetNumRows(); OFFSET_NEXT_AUTO_NUMBER = defineOffsetNextAutoNumber(); @@ -306,6 +341,11 @@ public abstract class JetFormat { protected abstract int defineMaxRowSize(); protected abstract int definePageInitialFreeSpace(); + protected abstract int defineOffsetMaskedHeader(); + protected abstract byte[] defineHeaderMask(); + protected abstract int defineOffsetHeaderDate(); + protected abstract int defineOffsetPassword(); + protected abstract int defineSizePassword(); protected abstract int defineOffsetNextTableDefPage(); protected abstract int defineOffsetNumRows(); protected abstract int defineOffsetNextAutoNumber(); @@ -414,6 +454,20 @@ public abstract class JetFormat { protected int definePageInitialFreeSpace() { return PAGE_SIZE - 14; } @Override + protected int defineOffsetMaskedHeader() { return 24; } + @Override + protected byte[] defineHeaderMask() { + byte[] mask = new byte[BASE_HEADER_MASK.length - 2]; + System.arraycopy(BASE_HEADER_MASK, 0, mask, 0, mask.length); + return mask; + } + @Override + protected int defineOffsetHeaderDate() { return -1; } + @Override + protected int defineOffsetPassword() { return 66; } + @Override + protected int defineSizePassword() { return 20; } + @Override protected int defineOffsetNextTableDefPage() { return 4; } @Override protected int defineOffsetNumRows() { return 12; } @@ -590,6 +644,16 @@ public abstract class JetFormat { protected int definePageInitialFreeSpace() { return PAGE_SIZE - 14; } @Override + protected int defineOffsetMaskedHeader() { return 24; } + @Override + protected byte[] defineHeaderMask() { return BASE_HEADER_MASK; } + @Override + protected int defineOffsetHeaderDate() { return 114; } + @Override + protected int defineOffsetPassword() { return 66; } + @Override + protected int defineSizePassword() { return 40; } + @Override protected int defineOffsetNextTableDefPage() { return 4; } @Override protected int defineOffsetNumRows() { return 16; } |