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Corrected datetime field handling in ProDOS filesystem.

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Natalia Portillo
2015-04-19 04:20:32 +01:00
parent a3c6853a4c
commit e33354e573
2 changed files with 22 additions and 8 deletions
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5
DiscImageChef/ChangeLog
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@@ -1,3 +1,8 @@
2015-04-19 Natalia Portillo <claunia@claunia.com>
* Plugins/ProDOS.cs:
Corrected datetime field handling in ProDOS filesystem.
2015-04-19 Natalia Portillo <claunia@claunia.com>
* ImagePlugins/2MG.cs:

25
DiscImageChef/Plugins/ProDOS.cs
View File

@@ -65,8 +65,8 @@ namespace DiscImageChef.Plugins
const byte ProDOSVersion1 = 0x00;
const UInt32 ProDOSYearMask = 0xFF000000;
const UInt32 ProDOSMonthMask = 0xE00000;
const UInt32 ProDOSYearMask = 0xFE000000;
const UInt32 ProDOSMonthMask = 0x1E00000;
const UInt32 ProDOSDayMask = 0x1F0000;
const UInt32 ProDOSHourMask = 0x1F00;
const UInt32 ProDOSMinuteMask = 0x3F;
@@ -133,6 +133,7 @@ namespace DiscImageChef.Plugins
byte[] temporal;
int year, month, day, hour, minute;
UInt16 temp_timestamp_left, temp_timestamp_right;
UInt32 temp_timestamp;
rootDirectoryKeyBlock.zero = BitConverter.ToUInt16(rootDirectoryKeyBlockBytes, 0x00);
@@ -144,16 +145,24 @@ namespace DiscImageChef.Plugins
rootDirectoryKeyBlock.header.volume_name = Encoding.ASCII.GetString(temporal);
rootDirectoryKeyBlock.header.reserved = BitConverter.ToUInt64(rootDirectoryKeyBlockBytes, 0x14);
// This is wrong as I don't know year epoch
// May also be wrong because documentation shows it as a 32 bit integer
// but does not say if it treats as 16 bit (probably) little endian
// pair or as a 32 bit little endian integer.
temp_timestamp = BitConverter.ToUInt32(rootDirectoryKeyBlockBytes, 0x1C);
year = (int)((temp_timestamp & ProDOSYearMask) >> 24);
temp_timestamp_left = BitConverter.ToUInt16(rootDirectoryKeyBlockBytes, 0x1C);
temp_timestamp_right = BitConverter.ToUInt16(rootDirectoryKeyBlockBytes, 0x1E);
temp_timestamp = (uint)((temp_timestamp_left << 16) + temp_timestamp_right);
year = (int)((temp_timestamp & ProDOSYearMask) >> 25);
month = (int)((temp_timestamp & ProDOSMonthMask) >> 21);
day = (int)((temp_timestamp & ProDOSDayMask) >> 16);
hour = (int)((temp_timestamp & ProDOSHourMask) >> 8);
minute = (int)(temp_timestamp & ProDOSMinuteMask);
year += 1900;
if (year < 1940)
year += 100;
if (MainClass.isDebug)
{
Console.WriteLine("DEBUG (ProDOS plugin): temp_timestamp_left = 0x{0:X4}", temp_timestamp_left);
Console.WriteLine("DEBUG (ProDOS plugin): temp_timestamp_right = 0x{0:X4}", temp_timestamp_right);
Console.WriteLine("DEBUG (ProDOS plugin): temp_timestamp = 0x{0:X8}", temp_timestamp);
Console.WriteLine("DEBUG (ProDOS plugin): Datetime field year {0}, month {1}, day {2}, hour {3}, minute {4}.", year, month, day, hour, minute);
}
rootDirectoryKeyBlock.header.creation_time = new DateTime(year, month, day, hour, minute, 0);
rootDirectoryKeyBlock.header.version = rootDirectoryKeyBlockBytes[0x20];