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fix file alignment and try (unsuccessfully) to calculate modification timestamp

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Michael Becker 2019-12-28 21:14:16 -05:00
parent bf1c8f0db3
commit 2f00dd0c17
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GPG Key ID: 506F54899E2BFED7
1 changed files with 17 additions and 3 deletions
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20
CSharp/Plugins/UniversalEditor.Plugins.FileSystem/DataFormats/FileSystem/CPIO/CPIODataFormat.cs
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@ -31,13 +31,15 @@ namespace UniversalEditor.DataFormats.FileSystem.CPIO
private CPIOEncoding mvarEncoding = CPIOEncoding.BinaryLittleEndian;
public CPIOEncoding Encoding { get { return mvarEncoding; } set { mvarEncoding = value; } }
private static DateTime UNIX_EPOCH { get; } = new DateTime(1970, 01, 01, 00, 00, 00).ToUniversalTime();
protected override void LoadInternal(ref ObjectModel objectModel)
{
FileSystemObjectModel fsom = (objectModel as FileSystemObjectModel);
if (fsom == null) throw new ObjectModelNotSupportedException();
Reader reader = base.Accessor.Reader;
bool firstone = true;
while (!reader.EndOfStream)
{
byte[] c_magic = reader.ReadBytes(2);
@ -54,7 +56,11 @@ namespace UniversalEditor.DataFormats.FileSystem.CPIO
{
base.Accessor.Seek(-2, SeekOrigin.Current);
string c_magic_str = reader.ReadFixedLengthString(5);
if (!(c_magic_str == "070701" || c_magic_str == "070702")) throw new InvalidDataFormatException("File does not begin with one of either { 0xC7, 0x71 }, { 0x71, 0xC7 }, { '070701' }, or { '070702' }");
if (!(c_magic_str == "070701" || c_magic_str == "070702"))
{
if (firstone)
throw new InvalidDataFormatException("File does not begin with one of either { 0xC7, 0x71 }, { 0x71, 0xC7 }, { '070701' }, or { '070702' }");
}
mvarEncoding = CPIOEncoding.ASCII;
}
@ -94,6 +100,9 @@ namespace UniversalEditor.DataFormats.FileSystem.CPIO
// an additional NUL byte is added after the pathname. The file data is then
// appended, padded with NUL bytes to an even length.
string c_filename = reader.ReadFixedLengthString(c_namesize).TrimNull();
if ((c_namesize % 2) != 0)
reader.ReadByte();
reader.Align(2);
if (c_filename == "TRAILER!!!")
@ -103,17 +112,22 @@ namespace UniversalEditor.DataFormats.FileSystem.CPIO
}
long offset = base.Accessor.Position;
// Hardlinked files are not given special treatment; the full file contents are
// included with each copy of the file.
File file = fsom.AddFile(c_filename);
file.ModificationTimestamp = UNIX_EPOCH.AddSeconds(c_mtime).ToLocalTime();
file.Size = c_filesize;
file.Source = new EmbeddedFileSource(reader, offset, c_filesize);
base.Accessor.Seek(c_filesize, SeekOrigin.Current);
// old version didn't do this (and failed epically); apparently we need to be aligned after skipping file data too
reader.Align(2);
break;
}
}
firstone = false;
if (fin) break;
}