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0400W - ZIP Compression Method
published
0400W v1.0
Item image
ZIP COMPRESSION METHOD
Compression Method
ZIP File Format
Expected Compression Method
Compression Method
https://qc.ebu.io/items/0400W/versions/1-0-0/
Check
Report
Summary
EBU QC Id
0400W
Name
ZIP Compression Method
Status
published
Category
absolute
Lead editor
Andrew Dunne
Aliases
Tags
IMF
Versions
Version Status Edition date Saved by Note
Details
Description
ZIP files can be compressed using different algorithms. In fact, ZIP files may not use any compression at all (compression method 0).
Definition
Used in Checks, the system shall check the compression method used in the ZIP file equals the expected compression method.

Used in Reports, the system shall report the compression method used in the ZIP file.
References

  • APPNOTE - .ZIP File Format Specification

    Remark: This format allows more options than the ISO norm referencing it.

  • ISO/IEC 21320-1

    Remark: ISO references the PKWARE spec, but restricts the compression options to 0 and 8 only!

Examples

  • Input: None
    Output: "Compression Method" = 0

    Remark: Used as a Report.
    The System simply reports the detected Compression Method in the ZIP file.

  • Input: "Compression Method Expected"= 14
    Output: "Check Result"=false
    Output: "Compression Method" = 0

    Remark: Used as a Check.
    CheckResult is false (test failed) because the detected Compression Method does not match the expected one.

Input parameters
Name Default value Description Data model name Unit Locator
Output parameters
Name Alias Description Data model name Unit Locator
Test material
Title Version Download
Remarks
Remarks
User discussions
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