file.h

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#pragma once
 
#include <cstdint>
#ifdef __cplusplus
extern "C" {
#else
#define constexpr
#endif
 
#include <stdint.h>
#include <stddef.h>
 
#ifndef __clang__
#define cstr(x) __attribute__((null_terminated_string_arg(x)))
#define ro(...) __attribute__((access(read_only, __VA_ARGS__)))
#define rw(...) __attribute__((access(read_write, __VA_ARGS__)))
#define wo(...) __attribute__((access(write_only, __VA_ARGS__)))
#else
#define cstr(x)
#define ro(...)
#define rw(...)
#define wo(...)
#endif
 
#define wu __attribute__((warn_unused_result))
 
// You don't want to work with these
// but this is the only way to get
// them relieably right
typedef uint16_t char_const16_t;
 
enum File_Error {
    FILE_OK = 0,
    FILE_ENOMEM = -1,
    FILE_EINVAL = -2,
    FILE_EDEVFAIL = -3,
    FILE_EMOUNTED = -4,
    FILE_EACCES = -5,
    FILE_EBADFSID = -6,
    FILE_ENOVOLUME = -7,
    FILE_ENOPATH = -8,
    FILE_EEXIST = -9,
    FILE_ENAMETOOLONG = -10,
    FILE_EOUTOFBOUND = -11,
    FILE_EUNFORMAT = -12,
    FILE_ENOSPC = -13,
    FILE_ENOENT = -14,
    FILE_EISDIRECTORY = -15,
    FILE_ESHARE = -16,
    FILE_EMFILE = -17,
    FILE_EBADF = -18,
    FILE_EEOF = -19,
    FILE_ENOTEMPTY = -20,
    FILE_ECLUSTERSIZEMISMATCH = -40,
    FILE_ESYSTEM = -99
};
 
enum File_Whence {
    FILE_SEEK_SET = 0,
    FILE_SEEK_CUR = 1,
    FILE_SEEK_END = 2
};
 
enum File_Open {
    FILE_OPEN_READ = 1 << 0,
    FILE_OPEN_WRITE = 1 << 1,
    FILE_OPEN_CREATE = 1 << 2,
    FILE_OPEN_APPEND = 1 << 4
};
 
static inline __attribute__((pure)) uint16_t constexpr File_StatDateYear(uint16_t date) {
    return ((date >> 9) & 0x7F) + 1980;
}
 
static inline __attribute__((pure)) uint16_t constexpr File_StatDateMonth(uint16_t date) {
    return (date >> 5) & 0xF;
}
 
static inline __attribute__((pure)) uint16_t constexpr File_StatDateDay(uint16_t date) {
    return date & 0x1F;
}
 
static inline __attribute__((pure)) uint16_t constexpr File_StatTimeHour(uint16_t time) {
    return (time >> 11) & 0x1F;
}
 
static inline __attribute__((pure)) uint16_t constexpr File_StatTimeMinute(uint16_t time) {
    return (time >> 5) & 0x3F;
}
 
static inline __attribute__((pure)) uint16_t constexpr File_StatTimeSecond(uint16_t time) {
    return (time & 0x1F) * 2;
}
 
struct File_Stat {
    uint32_t unknown1;
 
    uint32_t fileSize;
 
    uint16_t creationDate;
 
    uint16_t creationTime;
 
    uint16_t lastModifiedDate;
 
    uint16_t lastModifiedTime;
 
    uint16_t unknown2;
 
    uint16_t lastAccessedDate;
};
 
struct __attribute__((packed)) File_FindInfo {
    uint8_t unknown0[4];
 
    enum {
        EntryTypeFile = 0x1,
        EntryTypeDirectory = 0x5
    } type : 16;
 
    uint8_t unknown1[2];
    
    uint32_t size;
    
    uint8_t unknown2[8];
};
 
extern enum File_Error (*File_Close)(int fd);
 
extern enum File_Error (*File_FindClose)(int findHandle);
 
extern enum File_Error (*File_FindFirst)(const char_const16_t *path, int *findHandle, char_const16_t *name, struct File_FindInfo *findInfoBuf) wu cstr(1) ro(1) wo(2) wo(3) wo(4);
 
extern enum File_Error (*File_FindNext)(int findHandle, char_const16_t *name, struct File_FindInfo *findInfoBuf) wu wo(2) wo(3);
 
extern enum File_Error (*File_Fstat)(int fd, struct File_Stat *buf) wu wo(2);
 
extern enum File_Error (*File_GetAddr)(int fd, int offset, const void **addr) wu wo(3);
 
extern int (*File_Lseek)(int fd, int offset, enum File_Whence whence) wu;
 
extern enum File_Error (*File_Mkdir)(const char *path) wu cstr(1) ro(1);
 
extern int (*File_Open)(const char *path, int flags) wu cstr(1) ro(1);
 
extern int (*File_Read)(int fd, void *buf, int count) wu wo(2, 3);
 
extern enum File_Error (*File_Remove)(const char *path) cstr(1) ro(1);
 
extern enum File_Error (*File_Rename)(const char *oldPath, const char *newPath) wu cstr(1) cstr(2) ro(1) ro(2);
 
extern enum File_Error (*File_Stat)(const char *path, struct File_Stat *buf) wu cstr(1) ro(1) wo(2);
 
extern int (*File_Write)(int fd, const void *buf, int count) wu ro(2, 3);
 
#undef cstr
#undef ro
#undef rw
#undef wo
#undef wu
 
#ifdef __cplusplus
}
#else
#undef constexpr
#endif