111 lines
4.5 KiB
C
111 lines
4.5 KiB
C
/*
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File: file_wim.c
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Copyright (C) 2012 Christophe GRENIER <grenier@cgsecurity.org>
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This software 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 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include "types.h"
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#include "filegen.h"
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#include "common.h"
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#include "log.h"
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static void register_header_check_wim(file_stat_t *file_stat);
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/* http://go.microsoft.com/fwlink/?LinkId=92227 */
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const file_hint_t file_hint_wim= {
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.extension="wim",
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.description="Windows imaging (WIM) image",
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.max_filesize=PHOTOREC_MAX_FILE_SIZE,
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.recover=1,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_wim
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};
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struct reshdr_disk_short
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{
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union {
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uint64_t flags; /* one byte is a combination of RESHDR_FLAG_XXX */
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uint64_t size; /* the 7 low-bytes are used to store the size */
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};
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uint64_t offset;
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uint64_t original_size;
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} __attribute__ ((gcc_struct, __packed__));
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#define RESHDR_GET_SIZE(R) (le64(R.size) & 0x00FFFFFFFFFFFFFF)
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struct _WIMHEADER_V1_PACKED
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{
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char ImageTag[8];
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uint32_t cbSize;
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uint32_t dwVersion;
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uint32_t dwFlags;
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uint32_t dwCompressionSize;
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unsigned char gWIMGuid[16];
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uint16_t usPartNumber;
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uint16_t usTotalParts;
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uint32_t dwImageCount;
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struct reshdr_disk_short rhOffsetTable;
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struct reshdr_disk_short rhXmlData;
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struct reshdr_disk_short rhBootMetadata;
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uint32_t dwBootIndex;
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struct reshdr_disk_short rhIntegrity;
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unsigned char bUnused[60];
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} __attribute__ ((gcc_struct, __packed__));
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static int header_check_wim(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
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{
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const struct _WIMHEADER_V1_PACKED *hdr=(const struct _WIMHEADER_V1_PACKED *)buffer;
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uint64_t size=le32(hdr->cbSize);
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if(le32(hdr->cbSize) < sizeof(struct _WIMHEADER_V1_PACKED))
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return 0;
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#ifdef DEBUG_WIM
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log_info("cbSize %llu\n", (unsigned long long)le32(hdr->cbSize));
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log_info("dwCompressionSize %llu\n", (unsigned long long)le32(hdr->dwCompressionSize));
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log_info("rhOffsetTable %llu %llu\n", (unsigned long long)RESHDR_GET_SIZE(hdr->rhOffsetTable), (unsigned long long)le64(hdr->rhOffsetTable.offset));
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log_info("rhXmlData %llu %llu\n", (unsigned long long)RESHDR_GET_SIZE(hdr->rhXmlData), (unsigned long long)le64(hdr->rhXmlData.offset));
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log_info("rhBootMetadata %llu %llu\n", (unsigned long long)RESHDR_GET_SIZE(hdr->rhBootMetadata), (unsigned long long)le64(hdr->rhBootMetadata.offset));
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log_info("rhIntegrity %llu %llu\n", (unsigned long long)RESHDR_GET_SIZE(hdr->rhIntegrity), (unsigned long long)le64(hdr->rhIntegrity.offset));
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#endif
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if(RESHDR_GET_SIZE(hdr->rhOffsetTable) > 0 && RESHDR_GET_SIZE(hdr->rhOffsetTable) + le64(hdr->rhOffsetTable.offset) > size)
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size=RESHDR_GET_SIZE(hdr->rhOffsetTable) + le64(hdr->rhOffsetTable.offset);
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if(RESHDR_GET_SIZE(hdr->rhXmlData) > 0 && RESHDR_GET_SIZE(hdr->rhXmlData) + le64(hdr->rhXmlData.offset) > size)
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size=RESHDR_GET_SIZE(hdr->rhXmlData) + le64(hdr->rhXmlData.offset);
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if(RESHDR_GET_SIZE(hdr->rhBootMetadata) > 0 && RESHDR_GET_SIZE(hdr->rhBootMetadata) + le64(hdr->rhBootMetadata.offset) > size)
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size=RESHDR_GET_SIZE(hdr->rhBootMetadata) + le64(hdr->rhBootMetadata.offset);
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if(RESHDR_GET_SIZE(hdr->rhIntegrity) > 0 && RESHDR_GET_SIZE(hdr->rhIntegrity) + le64(hdr->rhIntegrity.offset) > size)
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size=RESHDR_GET_SIZE(hdr->rhIntegrity) + le64(hdr->rhIntegrity.offset);
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_wim.extension;
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file_recovery_new->calculated_file_size=size;
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file_recovery_new->data_check=&data_check_size;
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file_recovery_new->file_check=&file_check_size;
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return 1;
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}
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static void register_header_check_wim(file_stat_t *file_stat)
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{
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register_header_check(0, "MSWIM\0\0\0", 8, &header_check_wim, file_stat);
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}
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