[#absl-ExtendCrc32cByZeroes]
= xref:absl.adoc[absl]::ExtendCrc32cByZeroes
:relfileprefix: ../
:mrdocs:

Extend a CRC32C value as if trailing zero bytes were appended.

== Synopsis

Declared in `<absl/crc/crc32c.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:absl/crc32c_t.adoc[crc32c_t]
ExtendCrc32cByZeroes(
    xref:absl/crc32c_t.adoc[crc32c_t] initial_crc,
    size_t length);
----

== Description

Computes a CRC32C value for a buffer with an `initial_crc` CRC32C value, where `length` bytes with a value of 0 are appended to the buffer. Using this function is more efficient than computing a CRC32C value for the combined buffer from scratch.

This operation has a runtime cost of O(log(`length`))

== Return Value

The CRC32C value of the extended buffer.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *initial_crc*
| The CRC32C value of the existing buffer.
| *length*
| The number of zero bytes appended.
|===


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