mirror of
https://github.com/wiiu-env/homebrew_on_menu_plugin.git
synced 2024-06-02 17:48:43 +02:00
703 lines
21 KiB
C
703 lines
21 KiB
C
#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/dirent.h>
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#include <sys/iosupport.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include "romfs_dev.h"
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typedef enum {
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RomfsSource_FileDescriptor,
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} RomfsSource;
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typedef struct romfs_mount {
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devoptab_t device;
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bool setup;
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RomfsSource fd_type;
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int32_t id;
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int32_t fd;
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time_t mtime;
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uint64_t offset;
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romfs_header header;
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romfs_dir *cwd;
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uint32_t *dirHashTable, *fileHashTable;
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void *dirTable, *fileTable;
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char name[32];
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} romfs_mount;
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extern int __system_argc;
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extern char** __system_argv;
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//static char __thread __component[PATH_MAX+1];
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static char __component[PATH_MAX+1];
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#define romFS_root(m) ((romfs_dir*)(m)->dirTable)
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#define romFS_dir(m,x) ((romfs_dir*) ((uint8_t*)(m)->dirTable + (x)))
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#define romFS_file(m,x) ((romfs_file*)((uint8_t*)(m)->fileTable + (x)))
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#define romFS_none ((uint32_t)~0)
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#define romFS_dir_mode (S_IFDIR | S_IRUSR | S_IRGRP | S_IROTH)
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#define romFS_file_mode (S_IFREG | S_IRUSR | S_IRGRP | S_IROTH)
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uint64_t swapLong(uint64_t X) {
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uint64_t x = (uint64_t) X;
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x = (x & 0x00000000FFFFFFFF) << 32 | (x & 0xFFFFFFFF00000000) >> 32;
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x = (x & 0x0000FFFF0000FFFF) << 16 | (x & 0xFFFF0000FFFF0000) >> 16;
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x = (x & 0x00FF00FF00FF00FF) << 8 | (x & 0xFF00FF00FF00FF00) >> 8;
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return x;
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}
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#define REVERSE_SHORT(n) ((unsigned short) (((n & 0xFF) << 8) | \
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((n & 0xFF00) >> 8)))
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#define REVERSE_INT(n) ((unsigned int) (((n & 0xFF) << 24) | \
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((n & 0xFF00) << 8) | \
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((n & 0xFF0000) >> 8) | \
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((n & 0xFF000000) >> 24)))
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static ssize_t _romfs_read(romfs_mount *mount, uint64_t offset, void* buffer, uint64_t size) {
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uint64_t pos = mount->offset + offset;
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size_t _read = 0;
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if(mount->fd_type == RomfsSource_FileDescriptor) {
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off_t seek_offset = lseek(mount->fd, pos, SEEK_SET);
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if(pos != seek_offset) {
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return -1;
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}
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_read = read(mount->fd, buffer, size);
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}
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return _read;
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}
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static bool _romfs_read_chk(romfs_mount *mount, uint64_t offset, void* buffer, uint64_t size) {
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return _romfs_read(mount, offset, buffer, size) == size;
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}
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//-----------------------------------------------------------------------------
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static int romfs_open(struct _reent *r, void *fileStruct, const char *path, int flags, int mode);
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static int romfs_close(struct _reent *r, void *fd);
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static ssize_t romfs_read(struct _reent *r, void *fd, char *ptr, size_t len);
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static off_t romfs_seek(struct _reent *r, void *fd, off_t pos, int dir);
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static int romfs_fstat(struct _reent *r, void *fd, struct stat *st);
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static int romfs_stat(struct _reent *r, const char *path, struct stat *st);
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static int romfs_chdir(struct _reent *r, const char *path);
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static DIR_ITER* romfs_diropen(struct _reent *r, DIR_ITER *dirState, const char *path);
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static int romfs_dirreset(struct _reent *r, DIR_ITER *dirState);
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static int romfs_dirnext(struct _reent *r, DIR_ITER *dirState, char *filename, struct stat *filestat);
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static int romfs_dirclose(struct _reent *r, DIR_ITER *dirState);
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typedef struct {
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romfs_mount *mount;
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romfs_file *file;
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uint64_t offset, pos;
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} romfs_fileobj;
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typedef struct {
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romfs_mount *mount;
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romfs_dir* dir;
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uint32_t state;
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uint32_t childDir;
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uint32_t childFile;
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} romfs_diriter;
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static devoptab_t romFS_devoptab = {
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.structSize = sizeof(romfs_fileobj),
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.open_r = romfs_open,
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.close_r = romfs_close,
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.read_r = romfs_read,
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.seek_r = romfs_seek,
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.fstat_r = romfs_fstat,
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.stat_r = romfs_stat,
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.chdir_r = romfs_chdir,
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.dirStateSize = sizeof(romfs_diriter),
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.diropen_r = romfs_diropen,
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.dirreset_r = romfs_dirreset,
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.dirnext_r = romfs_dirnext,
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.dirclose_r = romfs_dirclose,
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};
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static bool romfs_initialised = false;
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static romfs_mount romfs_mounts[300];
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//-----------------------------------------------------------------------------
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static int32_t romfsMountCommon(const char *name, romfs_mount *mount);
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static void romfsInitMtime(romfs_mount *mount);
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static void _romfsResetMount(romfs_mount *mount, int32_t id) {
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memset(mount, 0, sizeof(*mount));
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memcpy(&mount->device, &romFS_devoptab, sizeof(romFS_devoptab));
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mount->device.name = mount->name;
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mount->device.deviceData = mount;
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mount->id = id;
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}
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static void _romfsInit(void) {
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uint32_t i;
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uint32_t total = sizeof(romfs_mounts) / sizeof(romfs_mount);
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if(!romfs_initialised) {
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for(i = 0; i < total; i++) {
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_romfsResetMount(&romfs_mounts[i], i);
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}
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romfs_initialised = true;
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}
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}
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static romfs_mount *romfsFindMount(const char *name) {
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uint32_t i;
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uint32_t total = sizeof(romfs_mounts) / sizeof(romfs_mount);
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romfs_mount *mount = NULL;
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_romfsInit();
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for(i=0; i<total; i++) {
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mount = &romfs_mounts[i];
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if(name==NULL) { //Find an unused mount entry.
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if(!mount->setup)
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return mount;
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} else if(mount->setup) { //Find the mount with the input name.
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if(strncmp(mount->name, name, sizeof(mount->name))==0)
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return mount;
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}
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}
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return NULL;
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}
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__attribute__((weak)) const char* __romfs_path = NULL;
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static romfs_mount* romfs_alloc(void) {
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return romfsFindMount(NULL);
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}
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static void romfs_free(romfs_mount *mount) {
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free(mount->fileTable);
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free(mount->fileHashTable);
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free(mount->dirTable);
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free(mount->dirHashTable);
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_romfsResetMount(mount, mount->id);
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}
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static void romfs_mountclose(romfs_mount *mount) {
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if(mount->fd_type == RomfsSource_FileDescriptor) {
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close(mount->fd);
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}
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romfs_free(mount);
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}
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int32_t romfsMount(const char *name, const char * filepath) {
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romfs_mount *mount = romfs_alloc();
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if(mount == NULL)
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return 99;
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// Regular RomFS
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mount->fd_type = RomfsSource_FileDescriptor;
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mount->fd = open(filepath, 0);
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if (mount->fd == -1) {
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romfs_free(mount);
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return -1;
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}
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romfsInitMtime(mount);
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return romfsMountCommon(name, mount);
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_fail0:
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romfs_mountclose(mount);
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return 10;
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}
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int32_t romfsMountCommon(const char *name, romfs_mount *mount) {
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memset(mount->name, 0, sizeof(mount->name));
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strncpy(mount->name, name, sizeof(mount->name)-1);
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if (_romfs_read(mount, 0, &mount->header, sizeof(mount->header)) != sizeof(mount->header))
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goto fail;
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mount->dirHashTable = (uint32_t*)malloc(swapLong(mount->header.dirHashTableSize));
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if (!mount->dirHashTable)
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goto fail;
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if (!_romfs_read_chk(mount, swapLong(mount->header.dirHashTableOff), mount->dirHashTable, swapLong(mount->header.dirHashTableSize)))
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goto fail;
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mount->dirTable = malloc(swapLong(mount->header.dirTableSize));
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if (!mount->dirTable)
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goto fail;
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if (!_romfs_read_chk(mount, swapLong(mount->header.dirTableOff), mount->dirTable, swapLong(mount->header.dirTableSize)))
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goto fail;
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mount->fileHashTable = (uint32_t*)malloc(swapLong(mount->header.fileHashTableSize));
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if (!mount->fileHashTable)
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goto fail;
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if (!_romfs_read_chk(mount, swapLong(mount->header.fileHashTableOff), mount->fileHashTable, swapLong(mount->header.fileHashTableSize)))
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goto fail;
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mount->fileTable = malloc(swapLong(mount->header.fileTableSize));
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if (!mount->fileTable)
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goto fail;
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if (!_romfs_read_chk(mount, swapLong(mount->header.fileTableOff), mount->fileTable, swapLong(mount->header.fileTableSize)))
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goto fail;
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mount->cwd = romFS_root(mount);
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// add device if this is the first one
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if(AddDevice(&mount->device) < 0)
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goto fail;
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mount->setup = true;
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return 0;
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fail:
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romfs_mountclose(mount);
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return 10;
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}
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static void romfsInitMtime(romfs_mount *mount) {
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mount->mtime = time(NULL);
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}
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int32_t romfsUnmount(const char *name) {
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romfs_mount *mount;
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char tmpname[34];
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mount = romfsFindMount(name);
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if (mount == NULL)
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return -1;
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// Remove device
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memset(tmpname, 0, sizeof(tmpname));
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strncpy(tmpname, mount->name, sizeof(tmpname)-2);
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strncat(tmpname, ":", sizeof(tmpname)-strlen(tmpname)-1);
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RemoveDevice(tmpname);
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romfs_mountclose(mount);
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return 0;
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}
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//-----------------------------------------------------------------------------
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static uint32_t calcHash(uint32_t parent, const uint8_t* name, uint32_t namelen, uint32_t total) {
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uint32_t hash = parent ^ 123456789;
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uint32_t i;
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for (i = 0; i < namelen; i ++) {
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hash = (hash >> 5) | (hash << 27);
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hash ^= name[i];
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}
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return hash % total;
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}
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static romfs_dir* searchForDir(romfs_mount *mount, romfs_dir* parent, const uint8_t* name, uint32_t namelen) {
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uint64_t parentOff = (uintptr_t)parent - (uintptr_t)mount->dirTable;
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uint32_t hash = calcHash(parentOff, name, namelen, swapLong(mount->header.dirHashTableSize)/4);
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romfs_dir* curDir = NULL;
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uint32_t curOff;
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for (curOff = REVERSE_INT(mount->dirHashTable[hash]); curOff != romFS_none; curOff = REVERSE_INT(curDir->nextHash)) {
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curDir = romFS_dir(mount, curOff);
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if (REVERSE_INT(curDir->parent) != parentOff)
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continue;
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if (REVERSE_INT(curDir->nameLen) != namelen)
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continue;
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if (memcmp(curDir->name, name, namelen) != 0)
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continue;
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return curDir;
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}
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return NULL;
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}
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static romfs_file* searchForFile(romfs_mount *mount, romfs_dir* parent, const uint8_t* name, uint32_t namelen) {
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uint64_t parentOff = (uintptr_t)parent - (uintptr_t)mount->dirTable;
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uint32_t hash = calcHash(parentOff, name, namelen, swapLong(mount->header.fileHashTableSize)/4);
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romfs_file* curFile = NULL;
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uint32_t curOff;
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for (curOff = REVERSE_INT(mount->fileHashTable[hash]); curOff != romFS_none; curOff = REVERSE_INT(curFile->nextHash)) {
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curFile = romFS_file(mount, curOff);
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if (REVERSE_INT(curFile->parent) != parentOff)
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continue;
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if (REVERSE_INT(curFile->nameLen) != namelen)
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continue;
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if (memcmp(curFile->name, name, namelen) != 0)
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continue;
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return curFile;
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}
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return NULL;
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}
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static int navigateToDir(romfs_mount *mount, romfs_dir** ppDir, const char** pPath, bool isDir) {
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char* colonPos = strchr(*pPath, ':');
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if (colonPos)
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*pPath = colonPos+1;
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if (!**pPath)
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return EILSEQ;
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*ppDir = mount->cwd;
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if (**pPath == '/') {
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*ppDir = romFS_root(mount);
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(*pPath)++;
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}
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while (**pPath) {
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char* slashPos = strchr(*pPath, '/');
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char* component = __component;
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if (slashPos) {
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uint32_t len = slashPos - *pPath;
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if (!len)
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return EILSEQ;
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if (len > PATH_MAX)
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return ENAMETOOLONG;
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memcpy(component, *pPath, len);
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component[len] = 0;
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*pPath = slashPos+1;
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} else if (isDir) {
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component = (char*)*pPath;
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*pPath += strlen(component);
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} else
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return 0;
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if (component[0]=='.') {
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if (!component[1])
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continue;
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if (component[1]=='.' && !component[2]) {
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*ppDir = romFS_dir(mount, REVERSE_INT((*ppDir)->parent));
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continue;
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}
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}
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*ppDir = searchForDir(mount, *ppDir, (uint8_t*)component, strlen(component));
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if (!*ppDir)
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return EEXIST;
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}
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if (!isDir && !**pPath)
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return EILSEQ;
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return 0;
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}
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static ino_t dir_inode(romfs_mount *mount, romfs_dir *dir) {
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return (uint32_t*)dir - (uint32_t*)mount->dirTable;
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}
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static off_t dir_size(romfs_dir *dir) {
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return sizeof(romfs_dir) + (REVERSE_INT(dir->nameLen)+3)/4;
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}
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static nlink_t dir_nlink(romfs_mount *mount, romfs_dir *dir) {
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nlink_t count = 2; // one for self, one for parent
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uint32_t offset = REVERSE_INT(dir->childDir);
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while(offset != romFS_none) {
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romfs_dir *tmp = romFS_dir(mount, offset);
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++count;
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offset = REVERSE_INT(tmp->sibling);
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}
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offset = REVERSE_INT(dir->childFile);
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while(offset != romFS_none) {
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romfs_file *tmp = romFS_file(mount, offset);
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++count;
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offset = REVERSE_INT(tmp->sibling);
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}
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return count;
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}
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static ino_t file_inode(romfs_mount *mount, romfs_file *file) {
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return ((uint32_t*)file - (uint32_t*)mount->fileTable) + swapLong(mount->header.dirTableSize)/4;
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}
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int romfs_GetFileInfoPerPath(const char* romfs, const char *path, romfs_fileInfo* out) {
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if(out == NULL){
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return -1;
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}
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romfs_mount* mount = (romfs_mount*)romfsFindMount(romfs);
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if(mount == NULL){
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return -2;
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}
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romfs_dir* curDir = NULL;
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int errno2 = navigateToDir(mount, &curDir, &path, false);
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if (errno2 != 0){
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return -3;
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}
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romfs_file* file = searchForFile(mount, curDir, (uint8_t*)path, strlen(path));
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if (!file) {
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return -4;
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}
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out->length = swapLong(file->dataSize);
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out->offset = swapLong(mount->header.fileDataOff) + swapLong(file->dataOff);
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return 0;
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}
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//-----------------------------------------------------------------------------
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int romfs_open(struct _reent *r, void *fileStruct, const char *path, int flags, int mode) {
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romfs_fileobj* fileobj = (romfs_fileobj*)fileStruct;
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fileobj->mount = (romfs_mount*)r->deviceData;
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if ((flags & O_ACCMODE) != O_RDONLY) {
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r->_errno = EROFS;
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return -1;
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}
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romfs_dir* curDir = NULL;
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r->_errno = navigateToDir(fileobj->mount, &curDir, &path, false);
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if (r->_errno != 0)
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return -1;
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romfs_file* file = searchForFile(fileobj->mount, curDir, (uint8_t*)path, strlen(path));
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if (!file) {
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if(flags & O_CREAT)
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r->_errno = EROFS;
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else
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r->_errno = ENOENT;
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return -1;
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} else if((flags & O_CREAT) && (flags & O_EXCL)) {
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r->_errno = EEXIST;
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return -1;
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}
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fileobj->file = file;
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fileobj->offset = swapLong(fileobj->mount->header.fileDataOff) + swapLong(file->dataOff);
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fileobj->pos = 0;
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return 0;
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}
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int romfs_close(struct _reent *r, void *fd) {
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return 0;
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}
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ssize_t romfs_read(struct _reent *r, void *fd, char *ptr, size_t len) {
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romfs_fileobj* file = (romfs_fileobj*)fd;
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uint64_t endPos = file->pos + len;
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/* check if past end-of-file */
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if(file->pos >= swapLong(file->file->dataSize))
|
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return 0;
|
|
|
|
/* truncate the read to end-of-file */
|
|
if(endPos > swapLong(file->file->dataSize))
|
|
endPos = swapLong(file->file->dataSize);
|
|
len = endPos - file->pos;
|
|
|
|
ssize_t adv = _romfs_read(file->mount, file->offset + file->pos, ptr, len);
|
|
if(adv >= 0) {
|
|
file->pos += adv;
|
|
return adv;
|
|
}
|
|
|
|
r->_errno = EIO;
|
|
return -1;
|
|
}
|
|
|
|
off_t romfs_seek(struct _reent *r, void *fd, off_t pos, int dir) {
|
|
romfs_fileobj* file = (romfs_fileobj*)fd;
|
|
off_t start;
|
|
switch (dir) {
|
|
case SEEK_SET:
|
|
start = 0;
|
|
break;
|
|
|
|
case SEEK_CUR:
|
|
start = file->pos;
|
|
break;
|
|
|
|
case SEEK_END:
|
|
start = swapLong(file->file->dataSize);
|
|
break;
|
|
|
|
default:
|
|
r->_errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
/* don't allow negative position */
|
|
if(pos < 0) {
|
|
if(start + pos < 0) {
|
|
r->_errno = EINVAL;
|
|
return -1;
|
|
}
|
|
}
|
|
/* check for overflow */
|
|
else if(INT64_MAX - pos < start) {
|
|
r->_errno = EOVERFLOW;
|
|
return -1;
|
|
}
|
|
|
|
file->pos = start + pos;
|
|
return file->pos;
|
|
}
|
|
|
|
int romfs_fstat(struct _reent *r, void *fd, struct stat *st) {
|
|
romfs_fileobj* file = (romfs_fileobj*)fd;
|
|
memset(st, 0, sizeof(struct stat));
|
|
st->st_ino = file_inode(file->mount, file->file);
|
|
st->st_mode = romFS_file_mode;
|
|
st->st_nlink = 1;
|
|
st->st_size = (off_t)swapLong(file->file->dataSize);
|
|
st->st_blksize = 512;
|
|
st->st_blocks = (st->st_blksize + 511) / 512;
|
|
st->st_atime = st->st_mtime = st->st_ctime = file->mount->mtime;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int romfs_stat(struct _reent *r, const char *path, struct stat *st) {
|
|
romfs_mount* mount = (romfs_mount*)r->deviceData;
|
|
romfs_dir* curDir = NULL;
|
|
r->_errno = navigateToDir(mount, &curDir, &path, false);
|
|
if(r->_errno != 0)
|
|
return -1;
|
|
|
|
romfs_dir* dir = searchForDir(mount, curDir, (uint8_t*)path, strlen(path));
|
|
if(dir) {
|
|
memset(st, 0, sizeof(*st));
|
|
st->st_ino = dir_inode(mount, dir);
|
|
st->st_mode = romFS_dir_mode;
|
|
st->st_nlink = dir_nlink(mount, dir);
|
|
st->st_size = dir_size(dir);
|
|
st->st_blksize = 512;
|
|
st->st_blocks = (st->st_blksize + 511) / 512;
|
|
st->st_atime = st->st_mtime = st->st_ctime = mount->mtime;
|
|
|
|
return 0;
|
|
}
|
|
|
|
romfs_file* file = searchForFile(mount, curDir, (uint8_t*)path, strlen(path));
|
|
if(file) {
|
|
memset(st, 0, sizeof(*st));
|
|
st->st_ino = file_inode(mount, file);
|
|
st->st_mode = romFS_file_mode;
|
|
st->st_nlink = 1;
|
|
st->st_size = swapLong(file->dataSize);
|
|
st->st_blksize = 512;
|
|
st->st_blocks = (st->st_blksize + 511) / 512;
|
|
st->st_atime = st->st_mtime = st->st_ctime = mount->mtime;
|
|
|
|
return 0;
|
|
}
|
|
|
|
r->_errno = ENOENT;
|
|
return 1;
|
|
}
|
|
|
|
int romfs_chdir(struct _reent *r, const char *path) {
|
|
romfs_mount* mount = (romfs_mount*)r->deviceData;
|
|
romfs_dir* curDir = NULL;
|
|
r->_errno = navigateToDir(mount, &curDir, &path, false);
|
|
if (r->_errno != 0)
|
|
return -1;
|
|
|
|
mount->cwd = curDir;
|
|
return 0;
|
|
}
|
|
|
|
DIR_ITER* romfs_diropen(struct _reent *r, DIR_ITER *dirState, const char *path) {
|
|
romfs_diriter* iter = (romfs_diriter*)(dirState->dirStruct);
|
|
romfs_dir* curDir = NULL;
|
|
iter->mount = (romfs_mount*)r->deviceData;
|
|
|
|
r->_errno = navigateToDir(iter->mount, &curDir, &path, true);
|
|
if(r->_errno != 0)
|
|
return NULL;
|
|
|
|
iter->dir = curDir;
|
|
iter->state = 0;
|
|
iter->childDir = REVERSE_INT(curDir->childDir);
|
|
iter->childFile = REVERSE_INT(curDir->childFile);
|
|
|
|
return dirState;
|
|
}
|
|
|
|
int romfs_dirreset(struct _reent *r, DIR_ITER *dirState) {
|
|
romfs_diriter* iter = (romfs_diriter*)(dirState->dirStruct);
|
|
|
|
iter->state = 0;
|
|
iter->childDir = REVERSE_INT(iter->dir->childDir);
|
|
iter->childFile = REVERSE_INT(iter->dir->childFile);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int romfs_dirnext(struct _reent *r, DIR_ITER *dirState, char *filename, struct stat *filestat) {
|
|
romfs_diriter* iter = (romfs_diriter*)(dirState->dirStruct);
|
|
|
|
if(iter->state == 0) {
|
|
/* '.' entry */
|
|
memset(filestat, 0, sizeof(*filestat));
|
|
filestat->st_ino = dir_inode(iter->mount, iter->dir);
|
|
filestat->st_mode = romFS_dir_mode;
|
|
|
|
strcpy(filename, ".");
|
|
iter->state = 1;
|
|
return 0;
|
|
} else if(iter->state == 1) {
|
|
/* '..' entry */
|
|
romfs_dir* dir = romFS_dir(iter->mount, REVERSE_INT(iter->dir->parent));
|
|
|
|
memset(filestat, 0, sizeof(*filestat));
|
|
filestat->st_ino = dir_inode(iter->mount, dir);
|
|
filestat->st_mode = romFS_dir_mode;
|
|
|
|
strcpy(filename, "..");
|
|
iter->state = 2;
|
|
return 0;
|
|
}
|
|
|
|
if(iter->childDir != romFS_none) {
|
|
romfs_dir* dir = romFS_dir(iter->mount, iter->childDir);
|
|
iter->childDir = REVERSE_INT(dir->sibling);
|
|
|
|
memset(filestat, 0, sizeof(*filestat));
|
|
filestat->st_ino = dir_inode(iter->mount, dir);
|
|
filestat->st_mode = romFS_dir_mode;
|
|
|
|
memset(filename, 0, NAME_MAX);
|
|
|
|
if(REVERSE_INT(dir->nameLen) >= NAME_MAX) {
|
|
r->_errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
|
|
strncpy(filename, (char*)dir->name, REVERSE_INT(dir->nameLen));
|
|
|
|
return 0;
|
|
} else if(iter->childFile != romFS_none) {
|
|
romfs_file* file = romFS_file(iter->mount, iter->childFile);
|
|
iter->childFile = REVERSE_INT(file->sibling);
|
|
|
|
memset(filestat, 0, sizeof(*filestat));
|
|
filestat->st_ino = file_inode(iter->mount, file);
|
|
filestat->st_mode = romFS_file_mode;
|
|
|
|
memset(filename, 0, NAME_MAX);
|
|
|
|
if(REVERSE_INT(file->nameLen) >= NAME_MAX) {
|
|
r->_errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
|
|
strncpy(filename, (char*)file->name, REVERSE_INT(file->nameLen));
|
|
|
|
return 0;
|
|
}
|
|
|
|
r->_errno = ENOENT;
|
|
return -1;
|
|
}
|
|
|
|
int romfs_dirclose(struct _reent *r, DIR_ITER *dirState) {
|
|
return 0;
|
|
}
|