54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
#pragma once
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#include <stdint.h>
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/* Directory structure:
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32-byte entries
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┌───────────────────────────────┐
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│Reserved │
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│char[32] │
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├──────┬──────┬────────┬────────┤
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│Offset│Size │Reserved│Name │
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│uint32│uint32│uint32 │char[20]│
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├──────┼──────┼────────┼────────┤
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│ ... │ │ │ │
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Offset is in sectors (zero-based),
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size is in bytes, name is 0-terminated.
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*/
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enum {
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sector_size = 512,
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ents_in_dir = 15,
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};
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struct dirent {
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uint32_t offset_sectors;
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uint32_t size_bytes;
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uint32_t reserved;
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char name[20];
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};
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/* This way we have 512 bytes (1 sector) per dir */
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struct dir {
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char reserved[32];
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struct dirent entries[ents_in_dir];
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};
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struct stat {
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uint32_t size;
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uint32_t start_sector;
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uint32_t reserved1, reserved2;
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};
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/* Find file by name and fill information in buf.
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* Returns zero on success, nonzero on failure. */
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int stat(const char *name, struct stat *buf);
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/* Find file by name and read it into buffer with size bufsize.
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* At most (bufsize & ~511) bytes will be read.
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* Return number of bytes read or -1 on failure. */
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int read_file(const struct stat *statbuf, void *buf, uint32_t bufsize);
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