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com.io7m.smfj.specification.binary-header.sdi Maven / Gradle / Ivy

[section [title Header] [id smfb.header]]
[paragraph]
An [term [type type] SMF/B] file begins with the following fixed-size
structure:

[formal-item [title "SMF/B Header"] [id smfb.header.def]]
[verbatim [include "binary-header-start.txt"]]

[paragraph]
The value of the [term [type field] magic] field MUST be
[term [type constant] 0x89534D460D0A1A0A]. Implementations MUST immediately
reject any files that do not begin with this magic number. The derivation of
this constant is taken almost verbatim from the PNG [footnote-ref smfb.png]
file format with the characters [term [type constant] PNG] changed to
[term [type constant] SMF].

[footnote [id smfb.png]]
[link-ext [target https://en.wikipedia.org/wiki/Portable_Network_Graphics#File_header] https://en.wikipedia.org/wiki/Portable_Network_Graphics#File_header]

[paragraph]
The [term [type field] version_major] field specifies the
[link [target smf_model.versioning] major] version number of the specification
to which the data in the file is expected to conform. The
[term [type field] version_minor] field specifies the
[link [target smf_model.versioning] minor] version number of the specification
to which the data in the file is expected to conform.