update docs

Author: picnixz

Doc/library/zlib.rst

@@ -44,6 +44,16 @@ The available exception and functions in this module are:
    .. versionchanged:: 3.0
       The result is always unsigned.
 
+.. function:: adler32_combine(adler1, adler2, len2, /)
+
+   Combine two Adler-32 checksums into one.
+
+   Given an Adler-32 check value *adler1* of a sequence A and an Adler-32 check
+   value *adler2* of a sequence B of length *len2*, the returned checksum
+   is the Adler-32 check value of A and B concatenated.
+
+   .. versionadded:: next
+
 .. function:: compress(data, /, level=-1, wbits=MAX_WBITS)
 
    Compresses the bytes in *data*, returning a bytes object containing compressed data.
@@ -136,6 +146,16 @@ The available exception and functions in this module are:
    .. versionchanged:: 3.0
       The result is always unsigned.
 
+.. function:: crc32_combine(crc1, crc2, len2, /)
+
+   Combine two CRC-32 checksums into one.
+
+   Given a CRC-32 check value *crc1* of a sequence A and a CRC-32 check
+   value *crc2* of a sequence B of length *len2*, the returned checksum
+   is the CRC-32 check value of A and B concatenated.
+
+   .. versionadded:: next
+
 .. function:: decompress(data, /, wbits=MAX_WBITS, bufsize=DEF_BUF_SIZE)
 
    Decompresses the bytes in *data*, returning a bytes object containing the

Doc/whatsnew/3.15.rst

@@ -97,6 +97,16 @@ ssl
   (Contributed by Will Childs-Klein in :gh:`133624`.)
 
 
+zlib
+----
+
+* Allow to combine two Adler-32 checksums via :func:`~zlib.adler32_combine`.
+  (Contributed by Callum Attryde and Bénédikt Tran in :gh:`134635`.)
+
+* Allow to combine two CRC-32 checksums via :func:`~zlib.crc32_combine`.
+  (Contributed by Bénédikt Tran in :gh:`134635`.)
+
+
 .. Add improved modules above alphabetically, not here at the end.
 
 Optimizations

Misc/NEWS.d/next/Library/2025-05-25-13-46-37.gh-issue-134635.ZlPrlX.rst

@@ -0,0 +1,3 @@
+:mod:`zlib`: Allow to combine Adler-32 and CRC-32 checksums via
+:func:`~zlib.adler32_combine` and :func:`~zlib.crc32_combine`. Patch by
+Callum Attryde and Bénédikt Tran.