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rustyx committed Sep 10, 2014
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119 changes: 119 additions & 0 deletions .cproject
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27 changes: 27 additions & 0 deletions .gitignore
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*.zip
*.gz
*.tmp
*.out
Debug/
Release/
*.sdf
*.old
_UpgradeReport_Files
ipch
UpgradeLog.XML
*.suo
*.exe
.classpath
/Servers*
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.idea/
*.iml
.svn
.DS_Store
*.log
*.log.?
*.log.??
composer.lock
vendor/
gen/
bin/
26 changes: 26 additions & 0 deletions .project
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<?xml version="1.0" encoding="UTF-8"?>
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<comment></comment>
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21 changes: 21 additions & 0 deletions .settings/org.eclipse.cdt.managedbuilder.core.prefs
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5 changes: 4 additions & 1 deletion README.md
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unpack_lznt1
============

Uncompressed Microsoft LZNT1 compressed files by calling RtlDecompressBuffer
A simple command-line Windows tool to uncompress Microsoft LZNT1-compressed files by calling RtlDecompressBuffer.

Can skip bytes at the beginning/end of the compressed input.

102 changes: 102 additions & 0 deletions unpack_lznt1.c
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/*
* unpack lznt1 command-line tool
*
* Author: Rustam Abdullaev
*
* Public domain.
*/
#include <windows.h>
// under mingw might complain about redefinition of PEXECUTION_STATE, if so comment it out in ntapi.h
#include <ddk/ntifs.h>
#include <stdio.h>
#include <stdlib.h>

void printLastError(const char*msg)
{
DWORD lastError = GetLastError();
LPVOID lpMsgBuf;
if (lastError == ERROR_SUCCESS || !FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, lastError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf, 0, NULL ))
{
fprintf(stderr, "ERROR! %s\n", msg);
} else
{
fprintf( stderr, "ERROR! %s: %s\n", msg, (char*)lpMsgBuf);
LocalFree( lpMsgBuf );
}
}

int main(int argc, char**argv) {
if (argc < 3) {
printf("Usage: unpack_LZNT1 <filename> <outfile> [<begin offset> [<end offset>]]\n");
return 1;
}
char *in = argv[1];
char *out = argv[2];
int offset = argc > 2 ? atoi(argv[3]) : 0;
int skipEnd = argc > 3 ? atoi(argv[4]) : 0;
HANDLE hfile = CreateFile(in, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
if (hfile == INVALID_HANDLE_VALUE) {
printLastError(in);
return 2;
}
int compSize = GetFileSize(hfile, NULL);
if (compSize == INVALID_FILE_SIZE) {
printLastError(in);
return 3;
}
compSize -= offset + skipEnd;
if (compSize <= 0) {
fprintf(stderr, "ERROR! Invalid offset\n");
return 3;
}
SetFilePointer(hfile, offset, NULL, 0);
BYTE *buf = malloc(compSize);
if (!buf) {
fprintf(stderr, "ERROR! Out of memory.\n");
return 4;
}
DWORD szout;
ReadFile(hfile, buf, compSize, &szout, NULL);
if (szout != compSize) {
printLastError(in);
free(buf);
return 5;
}
DWORD uncbufsize = (compSize - offset) * 5;
BYTE *uncbuf = malloc(uncbufsize);
if (!uncbuf) {
fprintf(stderr, "ERROR! Out of memory.\n");
return 4;
}
ULONG uncbytes = 0;
RtlDecompressBuffer(COMPRESSION_FORMAT_LZNT1, uncbuf, uncbufsize, buf, compSize, &uncbytes);
if (uncbytes < compSize - 100) {
printLastError("LZNT1 decompression failed");
free(uncbuf);
free(buf);
return 6;
}
free(buf);
CloseHandle(hfile);
hfile = CreateFile(out, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL);
if (hfile == INVALID_HANDLE_VALUE) {
printLastError(out);
free(uncbuf);
return 7;
}
WriteFile(hfile, uncbuf, uncbytes, &szout, NULL);
free(uncbuf);
if (szout != uncbytes) {
printLastError(out);
return 7;
}
CloseHandle(hfile);
printf("Done: unpacked %d -> %d bytes.\n", compSize, (int)uncbytes);
return 0;
}

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