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/* $Id: RTEfiFatExtract.cpp $ */
/** @file
* IPRT - Utility for extracting single files from a fat EFI binary.
*/
/*
* Copyright (C) 2019-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/formats/efi-fat.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/getopt.h>
#include <iprt/initterm.h>
#include <iprt/file.h>
#include <iprt/mem.h>
#include <iprt/message.h>
#include <iprt/path.h>
#include <iprt/stream.h>
#include <iprt/string.h>
static int efiFatExtractList(const char *pszInput)
{
RTFILE hFile = NIL_RTFILE;
int rc = RTFileOpen(&hFile, pszInput, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE);
if (RT_SUCCESS(rc))
{
EFI_FATHDR Hdr;
rc = RTFileReadAt(hFile, 0, &Hdr, sizeof(Hdr), NULL);
if (RT_SUCCESS(rc))
{
if ( RT_LE2H_U32(Hdr.u32Magic) == EFI_FATHDR_MAGIC
&& RT_LE2H_U32(Hdr.cFilesEmbedded) <= 16 /*Arbitrary number*/)
{
RTFOFF offRead = sizeof(Hdr);
for (uint32_t i = 0; i < RT_LE2H_U32(Hdr.cFilesEmbedded); i++)
{
EFI_FATDIRENTRY Entry;
rc = RTFileReadAt(hFile, offRead, &Entry, sizeof(Entry), NULL);
if (RT_SUCCESS(rc))
{
RTPrintf("Entry %u:\n", i);
RTPrintf(" CPU Type: %#x\n", RT_LE2H_U32(Entry.u32CpuType));
RTPrintf(" CPU Subtype: %#x\n", RT_LE2H_U32(Entry.u32CpuSubType));
RTPrintf(" Offset: %#x\n", RT_LE2H_U32(Entry.u32OffsetStart));
RTPrintf(" Size: %#x\n", RT_LE2H_U32(Entry.cbFile));
RTPrintf(" Alignment: %#x\n", RT_LE2H_U32(Entry.u32Alignment));
}
else
{
RTPrintf("Failed to read file entry %u of '%s': %Rrc\n", pszInput, i, rc);
break;
}
offRead += sizeof(Entry);
}
}
else
{
rc = VERR_INVALID_MAGIC;
RTPrintf("The header contains invalid values\n");
}
}
else
RTPrintf("Failed to read header of '%s': %Rrc\n", pszInput, rc);
RTFileClose(hFile);
}
else
RTPrintf("Failed to open file '%s': %Rrc\n", pszInput, rc);
return rc;
}
static int efiFatExtractSave(const char *pszInput, uint32_t idxEntry, const char *pszOut)
{
RTFILE hFile = NIL_RTFILE;
int rc = RTFileOpen(&hFile, pszInput, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE);
if (RT_SUCCESS(rc))
{
EFI_FATHDR Hdr;
rc = RTFileReadAt(hFile, 0, &Hdr, sizeof(Hdr), NULL);
if (RT_SUCCESS(rc))
{
if ( RT_LE2H_U32(Hdr.u32Magic) == EFI_FATHDR_MAGIC
&& RT_LE2H_U32(Hdr.cFilesEmbedded) <= 16 /*Arbitrary number*/)
{
if (idxEntry < RT_LE2H_U32(Hdr.cFilesEmbedded))
{
EFI_FATDIRENTRY Entry;
rc = RTFileReadAt(hFile, sizeof(Hdr) + idxEntry * sizeof(Entry), &Entry, sizeof(Entry), NULL);
if (RT_SUCCESS(rc))
{
void *pvFile = RTMemAllocZ(RT_LE2H_U32(Entry.cbFile));
if (RT_LIKELY(pvFile))
{
rc = RTFileReadAt(hFile, RT_LE2H_U32(Entry.u32OffsetStart), pvFile, RT_LE2H_U32(Entry.cbFile), NULL);
if (RT_SUCCESS(rc))
{
RTFILE hFileOut;
rc = RTFileOpen(&hFileOut, pszOut, RTFILE_O_WRITE | RTFILE_O_DENY_WRITE | RTFILE_O_CREATE);
if (RT_SUCCESS(rc))
{
rc = RTFileWrite(hFileOut, pvFile, RT_LE2H_U32(Entry.cbFile), NULL);
if (RT_FAILURE(rc))
RTPrintf("Failed to write output file '%s': %Rrc\n", pszOut, rc);
RTFileClose(hFileOut);
}
else
RTPrintf("Failed to create output file '%s': %Rrc\n", pszOut, rc);
}
else
RTPrintf("Failed to read embedded file %u: %Rrc\n", idxEntry, rc);
RTMemFree(pvFile);
}
else
RTPrintf("Failed to allocate %u bytes of memory\n", RT_LE2H_U32(Entry.cbFile));
}
else
RTPrintf("Failed to read file entry %u of '%s': %Rrc\n", pszInput, idxEntry, rc);
}
else
{
rc = VERR_INVALID_PARAMETER;
RTPrintf("Given index out of range, maximum is %u\n", RT_LE2H_U32(Hdr.cFilesEmbedded));
}
}
else
{
rc = VERR_INVALID_MAGIC;
RTPrintf("The header contains invalid values\n");
}
}
else
RTPrintf("Failed to read header of '%s': %Rrc\n", pszInput, rc);
RTFileClose(hFile);
}
else
RTPrintf("Failed to open file '%s': %Rrc\n", pszInput, rc);
return rc;
}
int main(int argc, char **argv)
{
int rc = RTR3InitExe(argc, &argv, 0);
if (RT_FAILURE(rc))
return RTMsgInitFailure(rc);
/*
* Parse arguments.
*/
static const RTGETOPTDEF s_aOptions[] =
{
{ "--input", 'i', RTGETOPT_REQ_STRING },
{ "--output", 'o', RTGETOPT_REQ_STRING },
{ "--entry", 'e', RTGETOPT_REQ_UINT32 },
{ "--help", 'h', RTGETOPT_REQ_NOTHING },
{ "--version", 'V', RTGETOPT_REQ_NOTHING },
};
RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
const char *pszInput = NULL;
const char *pszOut = NULL;
uint32_t idxEntry = UINT32_C(0xffffffff);
RTGETOPTUNION ValueUnion;
RTGETOPTSTATE GetState;
RTGetOptInit(&GetState, argc, argv, s_aOptions, RT_ELEMENTS(s_aOptions), 1, RTGETOPTINIT_FLAGS_OPTS_FIRST);
while ((rc = RTGetOpt(&GetState, &ValueUnion)))
{
switch (rc)
{
case 'h':
RTPrintf("Usage: %s [options]\n"
"\n"
"Options:\n"
" -i,--input=<file>\n"
" Input file\n"
" -e,--entry=<idx>\n"
" Selects the entry for saving\n"
" -o,--output=file\n"
" Save the specified entry to this file\n"
" -h, -?, --help\n"
" Display this help text and exit successfully.\n"
" -V, --version\n"
" Display the revision and exit successfully.\n"
, RTPathFilename(argv[0]));
return RTEXITCODE_SUCCESS;
case 'V':
RTPrintf("$Revision: 155244 $\n");
return RTEXITCODE_SUCCESS;
case 'i':
pszInput = ValueUnion.psz;
break;
case 'o':
pszOut = ValueUnion.psz;
break;
case 'e':
idxEntry = ValueUnion.u32;
break;
default:
return RTGetOptPrintError(rc, &ValueUnion);
}
}
if (!pszInput)
{
RTPrintf("An input path must be given\n");
return RTEXITCODE_FAILURE;
}
if (!pszOut || idxEntry == UINT32_C(0xffffffff))
rc = efiFatExtractList(pszInput);
else
rc = efiFatExtractSave(pszInput, idxEntry, pszOut);
if (RT_FAILURE(rc))
rcExit = RTEXITCODE_FAILURE;
return rcExit;
}
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