diff options
Diffstat (limited to 'libinstaller/syslxint.h')
| -rw-r--r-- | libinstaller/syslxint.h | 98 |
1 files changed, 87 insertions, 11 deletions
diff --git a/libinstaller/syslxint.h b/libinstaller/syslxint.h index 80c40f76..e5428b79 100644 --- a/libinstaller/syslxint.h +++ b/libinstaller/syslxint.h @@ -2,6 +2,7 @@ * * Copyright 2007-2008 H. Peter Anvin - All Rights Reserved * Copyright 2009-2011 Intel Corporation; author: H. Peter Anvin + * Copyright 2011 Paulo Alcantara <pcacjr@gmail.com> * * 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 @@ -22,6 +23,17 @@ # define X86_MEM 0 #endif +#ifdef __GNUC__ +# ifdef __MINGW32__ + /* gcc 4.7 miscompiles packed structures in MS-bitfield mode */ +# define PACKED __attribute__((packed,gcc_struct)) +# else +# define PACKED __attribute__((packed)) +# endif +#else +# error "Need to define PACKED for this compiler" +#endif + /* * Access functions for littleendian numbers, possibly misaligned. */ @@ -189,10 +201,10 @@ struct ext_patch_area { struct syslinux_extent { uint64_t lba; uint16_t len; -} __attribute__((packed)); +} PACKED; /* FAT bootsector format, also used by other disk-based derivatives */ -struct boot_sector { +struct fat_boot_sector { uint8_t bsJump[3]; char bsOemName[8]; uint16_t bsBytesPerSec; @@ -217,7 +229,7 @@ struct boot_sector { char VolumeLabel[11]; char FileSysType[8]; uint8_t Code[442]; - } __attribute__ ((packed)) bs16; + } PACKED bs16; struct { uint32_t FATSz32; uint16_t ExtFlags; @@ -233,18 +245,82 @@ struct boot_sector { char VolumeLabel[11]; char FileSysType[8]; uint8_t Code[414]; - } __attribute__ ((packed)) bs32; - } __attribute__ ((packed)); + } PACKED bs32; + } PACKED; uint32_t bsMagic; uint16_t bsForwardPtr; uint16_t bsSignature; -} __attribute__ ((packed)); +} PACKED; -#define bsHead bsJump -#define bsHeadLen offsetof(struct boot_sector, bsBytesPerSec) -#define bsCode bs32.Code /* The common safe choice */ -#define bsCodeLen (offsetof(struct boot_sector, bsSignature) - \ - offsetof(struct boot_sector, bsCode)) +/* NTFS bootsector format */ +struct ntfs_boot_sector { + uint8_t bsJump[3]; + char bsOemName[8]; + uint16_t bsBytesPerSec; + uint8_t bsSecPerClust; + uint16_t bsResSectors; + uint8_t bsZeroed_0[3]; + uint16_t bsZeroed_1; + uint8_t bsMedia; + uint16_t bsZeroed_2; + uint16_t bsUnused_0; + uint16_t bsUnused_1; + uint32_t bsUnused_2; + uint32_t bsZeroed_3; + uint32_t bsUnused_3; + uint64_t bsTotalSectors; + uint64_t bsMFTLogicalClustNr; + uint64_t bsMFTMirrLogicalClustNr; + uint8_t bsClustPerMFTrecord; + uint8_t bsUnused_4[3]; + uint8_t bsClustPerIdxBuf; + uint8_t bsUnused_5[3]; + uint64_t bsVolSerialNr; + uint32_t bsUnused_6; + + uint8_t Code[420]; + + uint32_t bsMagic; + uint16_t bsForwardPtr; + uint16_t bsSignature; +} PACKED; + +#define FAT_bsHead bsJump +#define FAT_bsHeadLen offsetof(struct fat_boot_sector, bsBytesPerSec) +#define FAT_bsCode bs32.Code /* The common safe choice */ +#define FAT_bsCodeLen (offsetof(struct fat_boot_sector, bsSignature) - \ + offsetof(struct fat_boot_sector, FAT_bsCode)) + +#define NTFS_bsHead bsJump +#define NTFS_bsHeadLen offsetof(struct ntfs_boot_sector, bsOemName) +#define NTFS_bsCode Code +#define NTFS_bsCodeLen (offsetof(struct ntfs_boot_sector, bsSignature) - \ + offsetof(struct ntfs_boot_sector, NTFS_bsCode)) + +/* Check if there are specific zero fields in an NTFS boot sector */ +static inline int ntfs_check_zero_fields(const struct ntfs_boot_sector *sb) +{ + return !sb->bsResSectors && (!sb->bsZeroed_0[0] && !sb->bsZeroed_0[1] && + !sb->bsZeroed_0[2]) && !sb->bsZeroed_1 && !sb->bsZeroed_2 && + !sb->bsZeroed_3; +} + +static inline int ntfs_check_sb_fields(const struct ntfs_boot_sector *sb) +{ + return ntfs_check_zero_fields(sb) && + (!memcmp(sb->bsOemName, "NTFS ", 8) || + !memcmp(sb->bsOemName, "MSWIN4.0", 8) || + !memcmp(sb->bsOemName, "MSWIN4.1", 8)); +} + +static inline int fat_check_sb_fields(const struct fat_boot_sector *sb) +{ + return sb->bsResSectors && sb->bsFATs && + (!memcmp(sb->bs16.FileSysType, "FAT12 ", 8) || + !memcmp(sb->bs16.FileSysType, "FAT16 ", 8) || + !memcmp(sb->bs16.FileSysType, "FAT ", 8) || + !memcmp(sb->bs32.FileSysType, "FAT32 ", 8)); +} #endif /* SYSLXINT_H */ |