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https://github.com/d0k3/GodMode9.git
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33 lines
1.4 KiB
C
33 lines
1.4 KiB
C
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#include "fatmbr.h"
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u32 ValidateMbrHeader(MbrHeader* mbr) {
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if (mbr->magic != FATMBR_MAGIC) return 1; // check magic
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u32 sector = 1; // check partitions
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for (u32 i = 0; i < 4; i++) {
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MbrPartitionInfo* partition = mbr->partitions + i;
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if (!partition->count && i) continue;
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else if (!partition->count) return 1; // first partition can't be empty
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if ((partition->type != 0x1) && (partition->type != 0x4) && (partition->type != 0x6) &&
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(partition->type != 0xB) && (partition->type != 0xC) && (partition->type != 0xE))
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return 1; // bad / unknown filesystem type
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if (partition->sector < sector) return 1; // overlapping partitions
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sector = partition->sector + partition->count;
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}
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return 0;
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}
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u32 ValidateFatHeader(void* fat) {
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if (getle16((u8*) fat + 0x1FE) != FATMBR_MAGIC) return 1; // check magic
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Fat32Header* fat32 = (Fat32Header*) fat;
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if (strncmp(fat32->fs_type, "FAT32 ", 8) == 0)
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return 0; // is FAT32 header
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Fat16Header* fat16 = (Fat16Header*) fat;
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if ((strncmp(fat16->fs_type, "FAT16 ", 8) == 0) ||
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(strncmp(fat16->fs_type, "FAT12 ", 8) == 0) ||
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(strncmp(fat16->fs_type, "FAT ", 8) == 0))
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return 0; // is FAT16 / FAT12 header
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if ((getle64(fat16->fs_type) == 0) && (fat16->sct_size == 0x200))
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return 0; // special case for public.sav
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return 1; // failed, not a FAT header
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}
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