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https://github.com/pbatard/rufus.git
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[boot] added MS-DOS file extraction from diskcopy.dll
* diskcopy.dll contains a resource ('BINFILE') that is a 1.4MB
floppy image of a bootable MS-DOS disk (FAT12)
* we can extract these files and use them for bootable USB
This commit is contained in:
Pete Batard
parent
60ac60ceb0
commit
f75a9fc7cb
6 changed files with 205 additions and 1 deletions
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@ -143,11 +143,13 @@
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</Link>
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</ItemDefinitionGroup>
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<ItemGroup>
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<ClCompile Include="..\msdos.c" />
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<ClCompile Include="..\rufus.c" />
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<ClCompile Include="..\stdlg.c" />
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</ItemGroup>
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<ItemGroup>
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<ClInclude Include="..\msapi_utf8.h" />
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<ClInclude Include="..\msdos.h" />
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<ClInclude Include="..\rufus.h" />
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<ClInclude Include="..\license.h" />
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<ClInclude Include="..\sys_types.h" />
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@ -21,6 +21,9 @@
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<ClCompile Include="..\stdlg.c">
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<Filter>Source Files</Filter>
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</ClCompile>
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<ClCompile Include="..\msdos.c">
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<Filter>Source Files</Filter>
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</ClCompile>
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</ItemGroup>
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<ItemGroup>
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<ClInclude Include="..\rufus.h">
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@ -35,6 +38,9 @@
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<ClInclude Include="..\sys_types.h">
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<Filter>Header Files</Filter>
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</ClInclude>
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<ClInclude Include="..\msdos.h">
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<Filter>Header Files</Filter>
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</ClInclude>
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</ItemGroup>
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<ItemGroup>
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<None Include="..\rufus.ico">
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@ -25,4 +25,5 @@ SXS_APPLICATION_MANIFEST=common_controls_and_elevation.manifest
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SOURCES=rufus.c \
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stdlg.c \
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msdos.c \
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rufus.rc
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2
Makefile
2
Makefile
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@ -6,7 +6,7 @@ STRIP = strip
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CFLAGS = -std=gnu99 -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow -O2 -Wl,--subsystem,windows -DWINVER=0x501 -D_WIN32_IE=0x501
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LIBS = -lsetupapi -lole32 -lgdi32
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RUFUS_SRC = rufus.c stdlg.c
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RUFUS_SRC = rufus.c stdlg.c msdos.c
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.PHONY: all clean
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145
msdos.c
Normal file
145
msdos.c
Normal file
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@ -0,0 +1,145 @@
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/*
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* Rufus: The Resourceful USB Formatting Utility
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* MS-DOS boot file extraction, from the FAT12 floppy image in diskcopy.dll
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* Copyright (c) 2011 Pete Batard <pete@akeo.ie>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Memory leaks detection - define _CRTDBG_MAP_ALLOC as preprocessor macro */
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#ifdef _CRTDBG_MAP_ALLOC
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#include <stdlib.h>
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#include <crtdbg.h>
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#endif
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#include <windows.h>
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#include <stdio.h>
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#include <string.h>
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#include "rufus.h"
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#include "msdos.h"
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static BYTE* DiskImage;
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static size_t DiskImageSize;
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/* Extract the file identified by FAT RootDir index 'entry' to 'path' */
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static BOOL ExtractFAT(int entry, const char* path)
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{
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FILE* fd;
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char filename[MAX_PATH];
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size_t i, pos;
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size_t filestart;
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size_t filesize;
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size_t FATFile = FAT12_ROOTDIR_OFFSET + entry*FAT12_ROOTDIR_ENTRY_SIZE;
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if ((path == NULL) || ((safe_strlen(path) + 14) > sizeof(filename))) {
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uprintf("invalid path supplied for MS-DOS FAT extraction\n");
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return FALSE;
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}
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strcpy(filename, path);
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pos = strlen(path);
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filename[pos++] = '\\';
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for(i=0; i<8; i++) {
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if (DiskImage[FATFile + i] == ' ')
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break;
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filename[pos++] = DiskImage[FATFile + i];
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}
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filename[pos++] = '.';
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for (i=8; i<11; i++) {
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if (DiskImage[FATFile + i] == ' ')
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break;
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filename[pos++] = DiskImage[FATFile + i];
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}
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filename[pos] = 0;
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GET_ULONG_LE(filesize, DiskImage, FATFile + FAT12_ROOTDIR_FILESIZE);
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GET_USHORT_LE(filestart, DiskImage, FATFile + FAT12_ROOTDIR_FIRSTCLUSTER);
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filestart += FAT12_CLUSTER_OFFSET;
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filestart *= FAT12_CLUSTER_SIZE;
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if ((filestart + filesize) > DiskImageSize) {
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uprintf("FAT File %s would be out of bounds\n", filename);
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return FALSE;
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}
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fd = fopen(filename, "wb");
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if (fd == NULL) {
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uprintf("Unable to create file '%s'.\n", filename);
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return FALSE;
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}
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if (fwrite(&DiskImage[filestart], 1, filesize, fd) != filesize) {
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uprintf("Couldn't write file '%s'.\n", filename);
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fclose(fd);
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return FALSE;
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}
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fclose(fd);
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uprintf("Succesfully wrote '%s' (%d bytes)\n", filename, filesize);
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// TODO: MSDOS.SYS and IO.SYS should have 'rahs' attributes
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return TRUE;
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}
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/* Extract the MS-DOS files contained in the FAT12 1.4MB floppy
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image included as resource "BINFILE" in diskcopy.dll */
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BOOL ExtractMSDOS(const char* path)
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{
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char dllname[MAX_PATH] = "C:\\Windows\\System32";
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int i, j;
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HMODULE hDLL;
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HRSRC hDiskImage;
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// TODO: optionally extract some more, including "deleted" entries
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char* extractlist[] = {"MSDOS SYS", "COMMAND COM", "IO SYS"};
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GetSystemDirectoryA(dllname, sizeof(dllname));
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safe_strcat(dllname, sizeof(dllname), "\\diskcopy.dll");
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hDLL = LoadLibraryA(dllname);
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if (hDLL == NULL) {
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uprintf("Unable to open %s: %s\n", dllname, WindowsErrorString());
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return FALSE;
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}
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hDiskImage = FindResourceA(hDLL, MAKEINTRESOURCEA(1), "BINFILE");
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if (hDiskImage == NULL) {
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uprintf("Unable to locate disk image in %s: %s\n", dllname, WindowsErrorString());
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FreeLibrary(hDLL);
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return FALSE;
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}
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DiskImage = (BYTE*)LockResource(LoadResource(hDLL, hDiskImage));
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if (DiskImage == NULL) {
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uprintf("Unable to access disk image in %s: %s\n", dllname, WindowsErrorString());
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FreeLibrary(hDLL);
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return FALSE;
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}
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DiskImageSize = (size_t)SizeofResource(hDLL, hDiskImage);
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// Sanity check
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if (DiskImageSize < 700*1024) {
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uprintf("MS-DOS disk image is too small (%d bytes)\n", dllname, DiskImageSize);
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FreeLibrary(hDLL);
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return FALSE;
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}
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for (i=0; i<FAT12_ROOTDIR_NB_ENTRIES; i++) {
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if (DiskImage[FAT12_ROOTDIR_OFFSET + i*FAT12_ROOTDIR_ENTRY_SIZE] == FAT12_DELETED_ENTRY)
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continue;
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for (j=0; j<ARRAYSIZE(extractlist); j++) {
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if (memcmp(extractlist[j], &DiskImage[FAT12_ROOTDIR_OFFSET + i*FAT12_ROOTDIR_ENTRY_SIZE], 8+3) == 0) {
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ExtractFAT(i, path);
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}
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}
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}
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FreeLibrary(hDLL);
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return TRUE;
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}
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50
msdos.h
Normal file
50
msdos.h
Normal file
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@ -0,0 +1,50 @@
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/*
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* Rufus: The Resourceful USB Formatting Utility
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* MS-DOS boot file extraction, from the FAT12 floppy image in diskcopy.dll
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* Copyright (c) 2011 Pete Batard <pete@akeo.ie>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* http://www.c-jump.com/CIS24/Slides/FAT/lecture.html */
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#define FAT12_ROOTDIR_OFFSET 0x2600
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#define FAT12_ROOTDIR_ENTRY_SIZE 0x20
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#define FAT12_ROOTDIR_NB_ENTRIES 0xE0
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#define FAT12_ROOTDIR_FIRSTCLUSTER 0x1A // No need for high word on a 1.44 MB media
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#define FAT12_ROOTDIR_FILESIZE 0x1C
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#define FAT12_DELETED_ENTRY 0xE5
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/* Ideally, we'd read those from the FAT Boot Sector, but we have
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a pretty good idea of what they are for a 1.44 MB floppy image */
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#define FAT12_CLUSTER_SIZE 0x200 // = sector size
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#define FAT12_DATA_START 0x4200
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#define FAT12_CLUSTER_OFFSET ((FAT12_DATA_START/FAT12_CLUSTER_SIZE)-2) // First cluster in data area is #2
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#ifndef GET_ULONG_LE
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#define GET_ULONG_LE(n,b,i) \
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{ \
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(n) = ( (ULONG) (b)[(i) ] ) \
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| ( (ULONG) (b)[(i) + 1] << 8 ) \
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| ( (ULONG) (b)[(i) + 2] << 16 ) \
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| ( (ULONG) (b)[(i) + 3] << 24 ); \
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}
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#endif
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#ifndef GET_USHORT_LE
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#define GET_USHORT_LE(n,b,i) \
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{ \
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(n) = ( (USHORT) (b)[(i) ] ) \
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| ( (USHORT) (b)[(i) + 1] << 8 ); \
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}
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#endif
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