Softdisk Text Compressor - Revision history

Sembiance: /* Sample files */

2023-12-28T17:47:49Z

‎Sample files

2022-10-26T21:10:27Z

‎Sample files

2022-10-26T21:08:37Z

‎Decoder/Encoder

2022-10-26T21:05:21Z

‎Sample files

2020-08-24T09:59:08Z

fixed table size, add link to clean room implementation for encoder/decoder)

2020-08-18T04:54:33Z

2020-02-12T00:09:39Z

‎Sample files

2015-12-10T23:58:00Z

2013-04-20T16:10:04Z

2012-12-09T22:40:59Z

@@ Line 41: / Line 41: @@
 == Sample files ==
 * [https://www.dan.info/sampledata/X03ONLIN.CTX Sample compressed text file]
-* https://telparia.com/fileFormatSamples/document/softdiskTextCompressed/
+* {{DexvertSamples|document/softdiskTextCompressed}}
 == Decoder/Encoder ==

@@ Line 41: / Line 41: @@
 == Sample files ==
 * [https://www.dan.info/sampledata/X03ONLIN.CTX Sample compressed text file]
-* https://telparia.com/fileFormatSamples/archive/softdiskTextCompressed/
+* https://telparia.com/fileFormatSamples/document/softdiskTextCompressed/
 == Decoder/Encoder ==

@@ Line 45: / Line 45: @@
 == Decoder/Encoder ==
-A cleanroom implementation can be found at https://art1pirat.spdns.org/art1/ctxer
+A cleanroom implementation can be found at https://git.fsfe.org/art1pirat/ctxer
 [[Category:Softdisk]]

@@ Line 41: / Line 41: @@
 == Sample files ==
 * [https://www.dan.info/sampledata/X03ONLIN.CTX Sample compressed text file]
 == Decoder/Encoder ==

@@ Line 16: / Line 16: @@
 Next was the original filename of the uncompressed file, as a variable-length null-terminated string.
-Then followed a table of fixed character sequences which were to be substituted for particular characters in the file. First there were 29 sequences of up to 5 characters, which were the uncompressed strings corresponding to the file input characters #0 - #9, #11 - #12, and #14 - #31 (decimal), in other words the [[C0 controls]] except for carriage return and linefeed. Each such sequence terminated at 5 characters or when a null (#0) was encountered, whichever came first.
+Then followed a table of fixed character sequences which were to be substituted for particular characters in the file. First there were 30 sequences of up to 5 characters, which were the uncompressed strings corresponding to the file input characters #0 - #9, #11 - #12, and #14 - #31 (decimal), in other words the [[C0 controls]] except for carriage return and linefeed. Each such sequence terminated at 5 characters or when a null (#0) was encountered, whichever came first.
 Next was a table of two-character sequences, 127 of them corresponding to the file input characters #128-#254.
@@ Line 41: / Line 41: @@
 == Sample files ==
 * [https://www.dan.info/sampledata/X03ONLIN.CTX Sample compressed text file]
 [[Category:Softdisk]]

@@ Line 12: / Line 12: @@
 The format was as follows:
-The first six bytes were flag bytes to indicate the file was of this format; they were expected to be (hex) 03 43 54 30 31 31, which was Control-C followed by CT001.
+The first six bytes were flag bytes to indicate the file was of this format; they were expected to be (hex) 03 43 54 30 30 31, which was Control-C followed by CT001.
 Next was the original filename of the uncompressed file, as a variable-length null-terminated string.

@@ Line 24: / Line 24: @@
 If it is a CR (#13), output a line break. (Linefeeds were stripped and ignored to save that precious one byte per line.)
-If it is #0-#9, #11-#12, or #13-31 (other control characters), replace it with the corresponding string sequence in the up-to-five-character table that was read in earlier.
+If it is #0-#9, #11-#12, or #14-31 (other control characters), replace it with the corresponding string sequence in the up-to-five-character table that was read in earlier.
 If it is #128-#254, replace it with the corresponding string sequence in the two-character table that was read in earlier.

← Older revision		Revision as of 16:10, 20 April 2013
Line 41:		Line 41:
	== Sample files ==		== Sample files ==
	* [http://www.dan.info/sampledata/X03ONLIN.CTX Sample compressed text file]		* [http://www.dan.info/sampledata/X03ONLIN.CTX Sample compressed text file]
		+
		+	[[Category:Softdisk]]

@@ Line 20: / Line 20: @@
 Next was a table of two-character sequences, 127 of them corresponding to the file input characters #128-#254.
-After this came the compressed data itself. The characters (bytes) were to be read one at a time, and treated as follows:
+After this came the compressed data itself. The characters (bytes) were to be read one at a time, and treated as follows (with anything not itemized below, i.e. the ASCII printable characters, treated as literal characters and output as is):
 If it is a CR (#13), output a line break. (Linefeeds were stripped and ignored to save that precious one byte per line.)