pip install pnu-strfile
strfile, unstr — create a random access file for storing strings
strfile [-Ciorsx] [-c char] [--debug] [--help|-?] [--version] [--] source_file [output_file]
unstr [--debug] [--help|-?] [--version] [--] source_file
The strfile utility reads a file containing groups of lines separated by a line containing a single percent ‘%’ sign and creates a data file which contains a header structure and a table of file offsets for each group of lines. This allows random access of the strings.
The output file, if not specified on the command line, is named source_file.dat.
The options are as follows:
| Options | Use |
|---|---|
| -C | Flag the file as containing comments. This option cases the STR_COMMENTS bit in the header str_flags field to be set. Comments are designated by two delimiter characters at the beginning of the line, though strfile does not give any special treatment to comment lines. |
| -c char | Change the delimiting character from the percent sign to char. |
| -i | Ignore case when ordering the strings. |
| -o | Order the strings in alphabetical order. The offset table will be sorted in the alphabetical order of the groups of lines referenced. Any initial non-alphanumeric characters are ignored. This option causes the STR_ORDERED bit in the header str_flags field to be set. |
| -r | Randomize access to the strings. Entries in the offset table will be randomly ordered. This option causes the STR_RANDOM bit in the header str_flags field to be set. The -o option has precedence over the -r option. |
| -s | Run silently; do not give a summary message when finished. |
| -x | Note that each alphabetic character in the groups of lines is rotated 13 positions in a simple caesar cypher. This option causes the STR_ROTATED bit in the header str_flags field to be set. |
| --debug | Enable debug mode |
| --help|-? | Print usage and a short help message and exit |
| --version | Print version and exit |
| -- | Options processing terminator |
The format of the header is:
#define VERSION 1
uint32_t str_version; /* version number */
uint32_t str_numstr; /* # of strings in the file */
uint32_t str_longlen; /* length of longest string */
uint32_t str_shortlen; /* length of shortest string */
#define STR_RANDOM 0x1 /* randomized pointers */
#define STR_ORDERED 0x2 /* ordered pointers */
#define STR_ROTATED 0x4 /* rot-13'd text */
#define STR_COMMENTS 0x8 /* embedded comments */
uint32_t str_flags; /* bit field for flags */
char str_delim; /* delimiting character */All fields are written in network byte order.
The purpose of unstr is to undo the work of strfile. It prints out the strings contained in the file source_file in the order that they are listed in the header file source_file.dat to standard output. It is possible to create sorted versions of input files by using -o when strfile is run and then using unstr to dump them out in the table order.
The STRFILE_DEBUG and UNSTR_DEBUG environment variables can also be set to any value to enable debug mode.
This re-implementation is fully compatible with the FreeBSD version.
It tries to follow the PEP 8 style guide for Python code.
Contributed by Ken Arnold, the strfile utility first appeared in 4.1cBSD.
This re-implementation was made for The PNU project.
This version is available under the 3-clause BSD license.
This version was written by Hubert Tournier.
The man page is derived from the FreeBSD project's one.
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