isfshax/stage2/isfs/super.h

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2021-05-26 01:53:11 +02:00
#pragma once
#include "isfs/isfs.h"
#include "nand.h"
#define ISFSSUPER_CLUSTERS 0x10
#define ISFSSUPER_SIZE (ISFSSUPER_CLUSTERS * CLUSTER_SIZE)
typedef struct isfs_fst {
char name[12];
u8 mode;
u8 attr;
u16 sub;
u16 sib;
u32 size;
u16 x1;
u16 uid;
u16 gid;
u32 x3;
} PACKED isfs_fst;
_Static_assert(sizeof(isfs_fst) == 0x20, "isfs_fst size must be 0x20!");
typedef struct isfs_hdr {
char magic[4];
u32 generation;
u32 x1;
} PACKED isfs_hdr;
_Static_assert(sizeof(isfs_hdr) == 0xC, "isfs_hdr size must be 0xC!");
typedef struct isfs_super {
isfs_hdr hdr;
u16 fat[CLUSTER_COUNT];
isfs_fst fst[6143];
u8 pad[20];
} PACKED ALIGNED(NAND_DATA_ALIGN) isfs_super;
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_Static_assert(sizeof(isfs_super) == ISFSSUPER_SIZE, "isfs_super must be 0x40000");
#define FAT_CLUSTER_LAST 0xFFFB // last cluster within a chain
#define FAT_CLUSTER_RESERVED 0xFFFC // reserved cluster
#define FAT_CLUSTER_BAD 0xFFFD // bad block (marked at factory)
#define FAT_CLUSTER_EMPTY 0xFFFE // empty (unused / available) space
typedef struct isfs_ctx isfs_ctx;
int isfs_get_super_version(void* buffer);
u32 isfs_get_super_generation(void* buffer);
isfs_hdr* isfs_get_hdr(isfs_ctx* ctx);
u16* isfs_get_fat(isfs_ctx* ctx);
isfs_fst* isfs_get_fst(isfs_ctx* ctx);
void isfs_print_fst(isfs_fst* fst);
int isfs_fst_get_type(const isfs_fst* fst);
bool isfs_fst_is_file(const isfs_fst* fst);
bool isfs_fst_is_dir(const isfs_fst* fst);
isfs_fst* isfs_find_fst(isfs_ctx* ctx, isfs_fst* fst, const char* path);
int isfs_super_check_slot(isfs_ctx *ctx, u32 index);
int isfs_super_mark_bad_slot(isfs_ctx *ctx, u32 index);
int isfs_read_super(isfs_ctx *ctx, void *super, int index);
int isfs_write_super(isfs_ctx *ctx, void *super, int index);
int isfs_find_super(isfs_ctx* ctx, u32 min_generation, u32 max_generation, u32 *generation, u32 *version);
int isfs_load_super(isfs_ctx* ctx, u32 min_generation, u32 max_generation);
int isfs_commit_super(isfs_ctx* ctx);