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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">Hi Douglas,</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">It's good to know that this functionality is accessible via Python, thanks for reaching out and updating us with this
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">Regards,</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">Kristian</span></div>
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<span style="font-size: 10pt; font-family: "Segoe UI Semibold", sans-serif; color: rgb(34, 42, 53);">Kristian Smith</span><span style="font-size: 10pt; color: rgb(34, 42, 53);"><o:p></o:p></span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Douglas Bagnall <douglas.bagnall@catalyst.net.nz><br>
<b>Sent:</b> Tuesday, December 27, 2022 4:02 PM<br>
<b>To:</b> cifs-protocol@lists.samba.org <cifs-protocol@lists.samba.org>; Interoperability Documentation Help <dochelp@microsoft.com><br>
<b>Subject:</b> [EXTERNAL] MS-XCA: RTL compression is available via Python on Windows</font>
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<div class="BodyFragment"><font size="2"><span style="font-size:11pt;">
<div class="PlainText">This is *not* a dochelp question, but a follow-up to a couple of unresolved
<br>
issues in recent MS-XCA threads that might be of interest to cifs-protocol and <br>
perhaps Jeff and Obaid who answered the questions.<br>
<br>
In <a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.samba.org%2Farchive%2Fcifs-protocol%2F2022-October%2F003821.html&data=05%7C01%7CKristian.Smith%40microsoft.com%7Cee7b3726f5764ac78e0208dae866da06%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638077825693030172%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=T6tW9piXLcTrL8Pnfiq9jpjdea2kHZKBvl6fU9lQtBM%3D&reserved=0">
https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.samba.org%2Farchive%2Fcifs-protocol%2F2022-October%2F003821.html&data=05%7C01%7CKristian.Smith%40microsoft.com%7Cee7b3726f5764ac78e0208dae866da06%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638077825693030172%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=T6tW9piXLcTrL8Pnfiq9jpjdea2kHZKBvl6fU9lQtBM%3D&reserved=0</a>
<br>
("[MS-XCA] is LZ77 + Huffman the same as the Win32 compression API? - <br>
TrackingID#2210190040006868"), I wrote of the ntifs-rtl functions:<br>
<br>
> I haven't been able to compile and link a test utility using this API, which <br>
> seems to be available in kernel mode only.<br>
> <br>
> I think it is possible, but you need to compile the thing as a driver, rather <br>
> than a plain executable.<br>
> <br>
> Some of the trouble is no doubt that I have been muddling around with emacs and
<br>
> gcc in various kinds of Cygwin, MinGW, MSYS2, and WSL, rather than committing to
<br>
> learning Visual Studio and its ecosystem.<br>
<br>
Well, it turns out you can access them through Python on Windows, using the <br>
standard ctypes module. As attached at the end. I didn't need to compile <br>
anything, let alone learn VS.<br>
<br>
The idea came from <br>
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fcoderforlife%2Fms-compress%2Fblob%2Fmaster%2Ftest%2Fcompressors.py&data=05%7C01%7CKristian.Smith%40microsoft.com%7Cee7b3726f5764ac78e0208dae866da06%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638077825693030172%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=SXPotHM%2Fx2wYNYevkOriGLUOlhNx5Szf9oxRU6CTCiU%3D&reserved=0">https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fcoderforlife%2Fms-compress%2Fblob%2Fmaster%2Ftest%2Fcompressors.py&data=05%7C01%7CKristian.Smith%40microsoft.com%7Cee7b3726f5764ac78e0208dae866da06%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638077825693030172%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=SXPotHM%2Fx2wYNYevkOriGLUOlhNx5Szf9oxRU6CTCiU%3D&reserved=0</a>.<br>
<br>
<br>
Secondly, once I had access to RTL via Python, I looked again at a file that I <br>
had constructed that didn't use LZ-77 matches, and which wouldn't decompress <br>
using the compress.h API. That's the thread ending at <br>
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<br>
("[MS-XCA] LZ77+ Huffman: questions about blocks - <br>
TrackingID#2211140040009096"), where Jeff says:<br>
<br>
> Please reach out to us at our DocHelp alias if you want to give us files that won't decompress, then we can trace through and tell you why.
<br>
<br>
But with the Python RTL bindings, the file *does* decompress, so that bug is out <br>
of scope for us all.<br>
<br>
What follows is the Python code mentioned above.<br>
<br>
cheers,<br>
Douglas<br>
<br>
<br>
-------------8<---------------------------------------------<br>
# Generate test vectors for Windows LZ77 Huffman compression.<br>
#<br>
# Copyright (c) 2022 Catalyst IT<br>
#<br>
# GPLv3+.<br>
#<br>
# This uses the Python ctypes module to access the lower level RTL<br>
# compression functions.<br>
<br>
import sys<br>
import argparse<br>
from ctypes import create_string_buffer, byref, windll<br>
from ctypes.wintypes import USHORT, ULONG, LONG, PULONG, LPVOID, CHAR<br>
NTSTATUS = LONG<br>
<br>
<br>
METHODS = {<br>
'LZNT1': 2,<br>
'XPRESS_PLAIN': 3,<br>
'XPRESS_HUFF': 4,<br>
'2': 2,<br>
'3': 3,<br>
'4': 4<br>
}<br>
<br>
<br>
class RtlError(Exception):<br>
pass<br>
<br>
<br>
def ntstatus_check(status, f, args):<br>
# 0x117 is STATUS_BUFFER_ALL_ZEROS<br>
status &= 0xffffffff<br>
if status in (0, 0x117):<br>
return status<br>
msg = {<br>
0xC0000023: "buffer too small",<br>
0xC0000242: "bad compression data",<br>
}.get(status, '')<br>
<br>
raise RtlError(f'NTSTATUS: {status:08X} {msg}')<br>
<br>
<br>
def wrap(f, result, *args):<br>
f.restype = result<br>
f.argtypes = args<br>
f.errcheck = ntstatus_check<br>
return f<br>
<br>
<br>
CompressBuffer = wrap(windll.ntdll.RtlCompressBuffer, NTSTATUS,<br>
USHORT, LPVOID, ULONG, LPVOID, ULONG, ULONG, PULONG,<br>
LPVOID)<br>
<br>
<br>
GetCompressionWorkSpaceSize = wrap(windll.ntdll.RtlGetCompressionWorkSpaceSize,<br>
NTSTATUS,<br>
USHORT, PULONG, PULONG)<br>
<br>
<br>
DecompressBufferEx = wrap(windll.ntdll.RtlDecompressBufferEx,<br>
NTSTATUS,<br>
USHORT, LPVOID, ULONG, LPVOID, ULONG, PULONG, LPVOID)<br>
<br>
<br>
def compress(data, format, effort=0):<br>
flags = USHORT(format | effort)<br>
workspace_size = ULONG(0)<br>
fragment_size = ULONG(0)<br>
comp_len = ULONG(0)<br>
GetCompressionWorkSpaceSize(flags,<br>
byref(workspace_size),<br>
byref(fragment_size))<br>
workspace = create_string_buffer(workspace_size.value)<br>
output_len = len(data) * 9 // 8 + 260<br>
output_buf = bytearray(output_len)<br>
CompressBuffer(flags,<br>
(CHAR * 1).from_buffer(data), len(data),<br>
(CHAR * 1).from_buffer(output_buf), output_len,<br>
4096,<br>
byref(comp_len),<br>
workspace)<br>
return output_buf[:comp_len.value]<br>
<br>
<br>
def decompress(data, format, target_size=None):<br>
flags = USHORT(format)<br>
workspace_size = ULONG(0)<br>
fragment_size = ULONG(0)<br>
decomp_len = ULONG(0)<br>
GetCompressionWorkSpaceSize(flags,<br>
byref(workspace_size),<br>
byref(fragment_size))<br>
workspace = create_string_buffer(workspace_size.value)<br>
if target_size is None:<br>
output_len = len(data) * 10<br>
else:<br>
output_len = target_size<br>
output_buf = bytearray(output_len)<br>
<br>
DecompressBufferEx(format,<br>
(CHAR * 1).from_buffer(output_buf), len(output_buf),<br>
(CHAR * 1).from_buffer(data), len(data),<br>
byref(decomp_len),<br>
workspace)<br>
return output_buf[:decomp_len.value]<br>
<br>
<br>
def main():<br>
if sys.getwindowsversion().major < 7:<br>
print("this probably won't work on your very old version of Windows\n"<br>
"but we'll try anyway!", file=sys.stderr)<br>
<br>
parser = argparse.ArgumentParser()<br>
parser.add_argument('-d', '--decompress', action='store_true',<br>
help='decompress instead of compress')<br>
parser.add_argument('-m', '--method', default='XPRESS_HUFF',<br>
choices=list(METHODS.keys()),<br>
help='use this compression method')<br>
parser.add_argument('-e', '--extra-effort', action='store_true',<br>
help='use extra effort to compress')<br>
<br>
parser.add_argument('-s', '--decompressed-size', type=int,<br>
help=('decompress to this size '<br>
'(required for XPRESS_HUFF'))<br>
<br>
parser.add_argument('-o', '--output',<br>
help='write to this file')<br>
parser.add_argument('-i', '--input',<br>
help='read data from this file')<br>
<br>
args = parser.parse_args()<br>
<br>
method = METHODS[args.method]<br>
<br>
if all((args.decompress,<br>
args.decompressed_size is None,<br>
method == 4)):<br>
print("a size is required for XPRESS_HUFF decompression")<br>
sys.exit(1)<br>
<br>
with open(args.input, 'rb') as f:<br>
data = bytearray(f.read())<br>
<br>
if args.decompress:<br>
output = decompress(data, method, args.decompressed_size)<br>
else:<br>
effort = 1 if args.extra_effort else 0<br>
output = compress(data, method, effort)<br>
<br>
with open(args.output, 'wb') as f:<br>
f.write(output)<br>
<br>
<br>
main()<br>
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