PackDir - Revision history

Polluks: /* Software */ XAD

2024-04-12T10:48:16Z

‎Software: XAD

Sembiance: /* Example files */ (no new ones, just a mirror of 2 known)

2024-02-18T15:42:48Z

‎Example files: (no new ones, just a mirror of 2 known)

AmigoJack: distinction from Quake PAK and Git Pack

2023-10-18T13:44:46Z

distinction from Quake PAK and Git Pack

Ccawley2011 at 15:29, 26 March 2023

2023-03-26T15:29:07Z

Ccawley2011 at 12:22, 4 October 2022

2022-10-04T12:22:50Z

Dan Tobias at 00:26, 20 February 2020

2020-02-20T00:26:27Z

Polluks: /* Software */ Deark

2019-12-04T19:40:13Z

‎Software: Deark

Jsummers at 19:50, 6 March 2019

2019-03-06T19:50:31Z

Jsummers at 21:04, 11 February 2019

2019-02-11T21:04:55Z

Jsummers: /* Identification */

2019-02-10T15:30:07Z

‎Identification

@@ Line 49: / Line 49: @@
 * [https://github.com/mjwoodcock/riscosarc riscosarc]
 * {{Deark}}
 == Example files ==

@@ Line 53: / Line 53: @@
 * [http://www.zeridajh.org/software/earthmap/downloads/earthmap_120.bin earthmap_120.bin]
 * {{ArcadeBBSLink|079556|MyXCard95A}}
 [[Category:RISC OS]]

@@ Line 42: / Line 42: @@
 == Identification ==
-Files begin with "{{magic|PACK}}", followed by {{magic|0x00}}. Note that this is not enough to distinguish them from [[Git]] pack format.
+Files begin with "{{magic|PACK}}", followed by {{magic|0x00}}. Note that this is not enough to distinguish them from [[Quake_PAK]] pack format. However, it cannot be a [[Git]] pack format, because Git expects a 4 byte version number in big endian, which means byte {{magic|0x02}} or {{magic|0x03}} would be there.
 == Software ==

@@ Line 46: / Line 46: @@
 == Software ==
 * [http://www.zeridajh.org/software/packdir/index.htm PackDir download page] (RISC OS software)
 * [https://github.com/mjwoodcock/riscosarc riscosarc]
 * {{Deark}}

@@ Line 51: / Line 51: @@
 == Example files ==
 * [http://www.zeridajh.org/software/earthmap/downloads/earthmap_120.bin earthmap_120.bin]
-* [ftp://www.arcade-bbs.net/data/077500/079550/079556 MyXCard95A]
+* {{ArcadeBBSLink|079556|MyXCard95A}}
 [[Category:RISC OS]]

@@ Line 5: / Line 5: @@
 '''PackDir''' is an archiving tool for RISC OS, and its associated file format. It can compress file using an [[LZW]] algorithm, or store uncompressed files.
-The LZW algorithm is the variant used in the [[ZOO]] archiver, except that the "max bits" parameter is configurable.
+The LZW algorithm is the variant used in the [[Zoo]] archiver, except that the "max bits" parameter is configurable.
 Its [[RISC OS filetype]] is 68E.

@@ Line 3: / Line 3: @@
 |subcat=Archiving
 }}
-'''PackDir''' is an archiving tool for RISC OS. It can compress file using an [[LZW]] algorithm, or store uncompressed files.
+'''PackDir''' is an archiving tool for RISC OS, and its associated file format. It can compress file using an [[LZW]] algorithm, or store uncompressed files.
 The LZW algorithm is the variant used in the [[ZOO]] archiver, except that the "max bits" parameter is configurable.

@@ Line 5: / Line 5: @@
 '''PackDir''' is an archiving tool for RISC OS. It can compress file using an [[LZW]] algorithm, or store uncompressed files.
-The LZW algorithm is the variant that is used in the [[ZOO]] archiver.
+The LZW algorithm is the variant used in the [[ZOO]] archiver, except that the "max bits" parameter is configurable.
 Its [[RISC OS filetype]] is 68E.
 == File format ==
-I have reverse engineered the file format.
+''This section contains reverse-engineered information about the format.''
 bit ints are in LSB format.  Strings are NULL-terminated ASCII.
-File/directory dates and times are stored in a RISC OS format: The low 8 bits of the "load" address, combined with the "exec" address, are a 40-bit integer representing the number of 0.01-second intervals since the beginning of the year 1900.
+File/directory dates and times are stored in a RISC OS format: The low 8 bits of the "load" address, combined with the "exec" address, form a 40-bit integer representing the number of 0.01-second intervals since the beginning of the year 1900.
 File format:
@@ Line 33: / Line 33: @@
 bit_int: original_file_length if this object is a file, number_of_child_entries otherwise
 bit_int: attributes (RISC OS read/write permissions)
-bit_int: entry_type: 1 == directory, 2 == file.  NB: This field is missing for the first entry in the file - the first entry is always a directory
+bit_int: entry_type: 1 == directory, 0 == file.  NB: This field is missing for the first entry in the file -
 If the entry is a file, then these fields follow:
-bit_int: Compressed_file_length
+bit_int: Compressed_file_length or special code - If this field is -1 the file is not compressed,
-bit_int: Compression_type: -1 == Not compressed, otherwise compressed with LZW.
+               otherwise compressed with LZW.
-     N bytes: archived file data.  N == compressed_file_length if compression_type == -1, otherwise original_file_length
+     N bytes: archived file data.  N == compressed_file_length if file is compressed, otherwise original_file_length
 == Identification ==