93 lines
1.4 KiB
C
93 lines
1.4 KiB
C
#ifndef K_KFS_H
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#define K_KFS_H
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#include <k/types.h>
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#define KFS_MAGIC 0xd35f9caa
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#define KFS_MIN_BLK_SZ 512
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#define KFS_BLK_SZ 4096
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#define KFS_BLK_DATA_SZ (KFS_BLK_SZ - 3 * 4)
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#define KFS_DIRECT_BLK 10
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#define KFS_INDIRECT_BLK 16
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#define KFS_INDIRECT_BLK_CNT 16
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#define KFS_FNAME_SZ 32
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#define KFS_NAME_SZ 32
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#define __packed __attribute__((__packed__))
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struct kfs_block {
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u32 idx;
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u32 usage;
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u32 cksum;
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u8 data[KFS_BLK_DATA_SZ];
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} __packed;
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struct kfs_iblock {
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u32 idx;
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u32 blk_cnt;
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u32 blks[KFS_INDIRECT_BLK_CNT];
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u32 cksum;
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} __packed;
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struct kfs_inode {
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u32 inumber;
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char filename[KFS_FNAME_SZ];
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u32 file_sz;
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u32 idx;
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u32 blk_cnt;
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u32 next_inode;
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u32 d_blk_cnt;
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u32 i_blk_cnt;
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u32 d_blks[KFS_DIRECT_BLK];
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u32 i_blks[KFS_INDIRECT_BLK];
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u32 cksum;
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} __packed;
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struct kfs_blk {
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union {
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struct kfs_block blk;
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struct kfs_iblock iblk;
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struct kfs_inode ino;
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u8 whole_blk[KFS_BLK_SZ];
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};
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};
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struct kfs_superblock {
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u32 magic;
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char name[KFS_NAME_SZ];
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s32 ctime;
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u32 blk_cnt;
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u32 inode_cnt;
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u32 inode_idx;
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u32 cksum;
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} __packed;
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#define ADLER32_MOD 65521
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/**
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* @brief Adler32 checksum.
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*/
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static inline unsigned int kfs_checksum(const void *data, size_t size)
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{
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unsigned int a = 1;
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unsigned int b = 0;
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size_t i = 0;
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const u8 *buf = data;
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while (i < size) {
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a += buf[i++];
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b += a;
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}
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return ((b % ADLER32_MOD) << 16) | (a % ADLER32_MOD);
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}
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#endif
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