Add _zstd module

This commit introduces the `_zstd` module, with bindings to libzstd from
the pyzstd project. It also includes the unix build system configuration.
Windows build system support will be integrated independently as it
depends on integration with cpython-source-deps.

Author: emmatyping

Doc/license.rst

@@ -1132,3 +1132,39 @@ The file is distributed under the 2-Clause BSD License::
   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Zstandard bindings
+------------------
+
+Zstandard bindings in :file:`Modules/_zstd` and :file:`Lib/zstd` are based on
+code from the pyzstd library, copyright Ma Lin and contributors. The code is
+distributed under the 3-Clause BSD License::
+
+  Copyright (c) 2020-present, Ma Lin and contributors.
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+  1. Redistributions of source code must retain the above copyright notice, this
+     list of conditions and the following disclaimer.
+
+  2. Redistributions in binary form must reproduce the above copyright notice,
+     this list of conditions and the following disclaimer in the documentation
+     and/or other materials provided with the distribution.
+
+  3. Neither the name of the copyright holder nor the names of its
+     contributors may be used to endorse or promote products derived from
+     this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Include/internal/pycore_global_objects_fini_generated.h

@@ -325,6 +325,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(bytes_per_sep)
         STRUCT_FOR_ID(c_call)
         STRUCT_FOR_ID(c_exception)
+        STRUCT_FOR_ID(c_parameter_type)
         STRUCT_FOR_ID(c_return)
         STRUCT_FOR_ID(cached_datetime_module)
         STRUCT_FOR_ID(cached_statements)
@@ -378,6 +379,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(count)
         STRUCT_FOR_ID(covariant)
         STRUCT_FOR_ID(cwd)
+        STRUCT_FOR_ID(d_parameter_type)
         STRUCT_FOR_ID(data)
         STRUCT_FOR_ID(database)
         STRUCT_FOR_ID(day)
@@ -392,6 +394,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(deterministic)
         STRUCT_FOR_ID(device)
         STRUCT_FOR_ID(dict)
+        STRUCT_FOR_ID(dict_content)
         STRUCT_FOR_ID(dictcomp)
         STRUCT_FOR_ID(difference_update)
         STRUCT_FOR_ID(digest)
@@ -457,6 +460,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(follow_symlinks)
         STRUCT_FOR_ID(format)
         STRUCT_FOR_ID(format_spec)
+        STRUCT_FOR_ID(frame_buffer)
         STRUCT_FOR_ID(from_param)
         STRUCT_FOR_ID(fromlist)
         STRUCT_FOR_ID(fromtimestamp)
@@ -514,6 +518,8 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(intern)
         STRUCT_FOR_ID(intersection)
         STRUCT_FOR_ID(interval)
+        STRUCT_FOR_ID(is_compress)
+        STRUCT_FOR_ID(is_raw)
         STRUCT_FOR_ID(is_running)
         STRUCT_FOR_ID(is_struct)
         STRUCT_FOR_ID(isatty)
@@ -637,6 +643,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(overlapped)
         STRUCT_FOR_ID(owner)
         STRUCT_FOR_ID(pages)
+        STRUCT_FOR_ID(parameter)
         STRUCT_FOR_ID(parent)
         STRUCT_FOR_ID(password)
         STRUCT_FOR_ID(path)
@@ -798,6 +805,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(write_through)
         STRUCT_FOR_ID(year)
         STRUCT_FOR_ID(zdict)
+        STRUCT_FOR_ID(zstd_dict)
     } identifiers;
     struct {
         PyASCIIObject _ascii;

Include/internal/pycore_global_strings.h

@@ -3332,6 +3332,7 @@ MODULE__TESTCAPI_DEPS=$(srcdir)/Modules/_testcapi/parts.h $(srcdir)/Modules/_tes
 MODULE__TESTLIMITEDCAPI_DEPS=$(srcdir)/Modules/_testlimitedcapi/testcapi_long.h $(srcdir)/Modules/_testlimitedcapi/parts.h $(srcdir)/Modules/_testlimitedcapi/util.h
 MODULE__TESTINTERNALCAPI_DEPS=$(srcdir)/Modules/_testinternalcapi/parts.h
 MODULE__SQLITE3_DEPS=$(srcdir)/Modules/_sqlite/connection.h $(srcdir)/Modules/_sqlite/cursor.h $(srcdir)/Modules/_sqlite/microprotocols.h $(srcdir)/Modules/_sqlite/module.h $(srcdir)/Modules/_sqlite/prepare_protocol.h $(srcdir)/Modules/_sqlite/row.h $(srcdir)/Modules/_sqlite/util.h
+MODULE__ZSTD_DEPS=$(srcdir)/Modules/_zstd/_zstdmodule.h $(srcdir)/Modules/_zstd/buffer.h
 
 CODECS_COMMON_HEADERS=$(srcdir)/Modules/cjkcodecs/multibytecodec.h $(srcdir)/Modules/cjkcodecs/cjkcodecs.h
 MODULE__CODECS_CN_DEPS=$(srcdir)/Modules/cjkcodecs/mappings_cn.h $(CODECS_COMMON_HEADERS)

Include/internal/pycore_runtime_init_generated.h

@@ -200,6 +200,7 @@ PYTHONPATH=$(COREPYTHONPATH)
 #_dbm _dbmmodule.c -lgdbm_compat -DUSE_GDBM_COMPAT
 #_gdbm _gdbmmodule.c -lgdbm
 #_lzma _lzmamodule.c -llzma
+#_zstd _zstd/_zstdmodule.c -lzstd -I$(srcdir)/Modules/_zstd
 #_uuid _uuidmodule.c -luuid
 #zlib  zlibmodule.c -lz
 

Include/internal/pycore_unicodeobject_generated.h

@@ -64,10 +64,11 @@
 @MODULE__DECIMAL_TRUE@_decimal _decimal/_decimal.c
 
 # compression libs and binascii (optional CRC32 from zlib)
-# bindings need -lbz2, -lz, or -llzma, respectively
+# bindings need -lbz2, -llzma, -lzstd, or -lz, respectively
 @MODULE_BINASCII_TRUE@binascii binascii.c
 @MODULE__BZ2_TRUE@_bz2 _bz2module.c
 @MODULE__LZMA_TRUE@_lzma _lzmamodule.c
+@MODULE__ZSTD_TRUE@_zstd _zstd/_zstdmodule.c _zstd/zdict.c _zstd/compressor.c _zstd/decompressor.c
 @MODULE_ZLIB_TRUE@zlib zlibmodule.c
 
 # dbm/gdbm