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25 lines
930 B
C
25 lines
930 B
C
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#include "ncch.h"
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u32 ValidateNcchHeader(NcchHeader* header) {
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if (memcmp(header->magic, "NCCH", 4) != 0) // check magic number
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return 1;
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u32 ncch_units = (NCCH_EXTHDR_OFFSET + header->size_exthdr) / NCCH_MEDIA_UNIT; // exthdr
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if (header->size_plain) { // plain region
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if (header->offset_plain < ncch_units) return 1; // overlapping plain region
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ncch_units = (header->offset_plain + header->size_plain);
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}
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if (header->size_exefs) { // ExeFS
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if (header->offset_exefs < ncch_units) return 1; // overlapping exefs region
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ncch_units = (header->offset_exefs + header->size_exefs);
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}
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if (header->size_romfs) { // RomFS
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if (header->offset_romfs < ncch_units) return 1; // overlapping romfs region
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ncch_units = (header->offset_romfs + header->size_romfs);
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}
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// size check
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if (ncch_units > header->size) return 1;
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return 0;
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}
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