GZip-kb Module
1 Introduction
The GZIP-kb module recognizes and validates the Gzip (GNU zip) format. [GZip].
The module is invoked by the:
jhove ... -m GZIP-kb ...
command line option.
The GZIP-kb module recognizes and validates GZip version 4.3. It also supports multiple member GZip files. This module uses the JWAT library for GZip parsing.
This module doesn’t have configurable parameters.
2 Coverage
The GZIP-kb module recognizes and validates the following public profiles:
3 Well-Formedness
The GZip module checks well-formedness.
4 Validity
The following criteria must be met by a GZip file for JHOVE to consider it valid:
- The file is well-formed. In the GZIP-kb module, well-formedness and validity are equivalent.
5 Representation Information
The MIME type is reported as: application/gzip [RFC 6713]. Application/x-gzip is also supported.
In addition to the standard JHOVE representation information, the following GZip-specific properties are reported:
- Property “GzipEntryProperties”
- Property “Is non compliant” of type
STRING - Property “Offset value” of type
STRING - Property “GZip entry name” of type
STRING - Property “GZip entry comment” of type
STRING - Property “GZip entry date” of type
STRING - Property “GZip entry compression method” of type
STRING - Property “GZip entry operating system” of type
STRING - Property “GZip entry header crc16” of type
STRING - Property “GZip entry crc32” of type
STRING - Property “GZip entry extracted size (ISIZE)” of type
STRING - Property “GZip entry (computed) uncompressed size, in bytes” of type
STRING - Property “GZip entry (computed) compressed size, in bytes” of type
STRING - Property “GZip entry (computed) compression ratio” of type
STRING
- Property “Is non compliant” of type
6 Additional Module Properties
- Nominal file extension:
.gz