feat: export constants &cie from lzma

Author: Rogdham

CHANGELOG.md

@@ -13,6 +13,8 @@ adheres to [Semantic Versioning](https://semver.org/).
 
 - Allow to `seek` past the end of the fileobj
 - Calling `len` on a fileobj gives its length, and `bool` tells if it is empty
+- Export useful constants and functions from `lzma` for easy access: checks, filters,
+  etc.
 
 ### :house: Internal
 

src/xz/__init__.py

@@ -1,8 +1,39 @@
+from lzma import (
+    CHECK_CRC32,
+    CHECK_CRC64,
+    CHECK_ID_MAX,
+    CHECK_NONE,
+    CHECK_SHA256,
+    CHECK_UNKNOWN,
+    FILTER_ARM,
+    FILTER_ARMTHUMB,
+    FILTER_DELTA,
+    FILTER_IA64,
+    FILTER_LZMA1,
+    FILTER_LZMA2,
+    FILTER_POWERPC,
+    FILTER_SPARC,
+    FILTER_X86,
+    MF_BT2,
+    MF_BT3,
+    MF_BT4,
+    MF_HC3,
+    MF_HC4,
+    MODE_FAST,
+    MODE_NORMAL,
+    PRESET_DEFAULT,
+    PRESET_EXTREME,
+    compress,
+    decompress,
+    is_check_supported,
+)
+
 try:
     from xz._version import __version__
 except ImportError:  # pragma: no cover
     __version__ = "0.0.0.dev0-unknown"
 
+
 from xz.common import XZError
 from xz.file import XZFile
 from xz.open import xz_open
@@ -17,4 +48,32 @@
     "XZError",
     "XZFile",
     "open",
+    # re-export from lzma for easy access
+    "CHECK_CRC32",
+    "CHECK_CRC64",
+    "CHECK_ID_MAX",
+    "CHECK_NONE",
+    "CHECK_SHA256",
+    "CHECK_UNKNOWN",
+    "FILTER_ARM",
+    "FILTER_ARMTHUMB",
+    "FILTER_DELTA",
+    "FILTER_IA64",
+    "FILTER_LZMA1",
+    "FILTER_LZMA2",
+    "FILTER_POWERPC",
+    "FILTER_SPARC",
+    "FILTER_X86",
+    "MF_BT2",
+    "MF_BT3",
+    "MF_BT4",
+    "MF_HC3",
+    "MF_HC4",
+    "MODE_FAST",
+    "MODE_NORMAL",
+    "PRESET_DEFAULT",
+    "PRESET_EXTREME",
+    "compress",
+    "decompress",
+    "is_check_supported",
 )