[#absl-RemoveCrc32cPrefix]
= xref:absl.adoc[absl]::RemoveCrc32cPrefix
:relfileprefix: ../
:mrdocs:

Compute the CRC32C value of a buffer with a prefix removed.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:absl/crc32c_t.adoc[crc32c_t]
RemoveCrc32cPrefix(
    xref:absl/crc32c_t.adoc[crc32c_t] prefix_crc,
    xref:absl/crc32c_t.adoc[crc32c_t] full_string_crc,
    size_t remaining_string_length);
----

== Description

Calculates the CRC32C value of an existing buffer with a series of bytes (the prefix) removed from the beginning of that buffer.

Given the CRC32C value of an existing buffer, `full_string_crc`; The CRC32C value of a prefix of that buffer, `prefix_crc`; and the length of the buffer with the prefix removed, `remaining_string_length` , return the CRC32C value of the buffer with the prefix removed.

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

== Return Value

The CRC32C value of the buffer with the prefix removed.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *prefix_crc*
| The CRC32C value of the prefix being removed.
| *full_string_crc*
| The CRC32C value of the complete buffer.
| *remaining_string_length*
| The length of the buffer after removal.
|===


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