9 #include "include/fs.h"
11 typedef int (*dfunc)(int);
14 get_le_short(void *from)
16 unsigned char *p = from;
17 return ((unsigned short)(p[1]) << 8) +
21 static unsigned int get_le_long(void *from)
23 unsigned char *p = from;
24 return ((unsigned int)(p[3]) << 24) +
25 ((unsigned int)(p[2]) << 16) +
26 ((unsigned int)(p[1]) << 8) +
30 static unsigned short get_be_short(void *from)
32 unsigned char *p = from;
33 return ((unsigned short)(p[0]) << 8) +
37 static unsigned int get_be_long(void *from)
39 unsigned char *p = from;
40 return ((unsigned int)(p[0]) << 24) +
41 ((unsigned int)(p[1]) << 16) +
42 ((unsigned int)(p[2]) << 8) +
46 static int get_buffer(int fd, unsigned char *b, int offset, int len)
48 if(lseek(fd, offset, SEEK_SET) != offset)
50 if(read(fd, b, len) != len)
55 #define MBR_BUF_SIZE 512
56 static int detect_mbr(int fd)
59 unsigned char *buffer = (unsigned char*)malloc(MBR_BUF_SIZE);
60 if(get_buffer(fd, buffer, 0, MBR_BUF_SIZE) != 0)
62 if((buffer[510] == 0x55) && (buffer[511] == 0xAA))
69 #define EFI_BUF_OFFSET 512
70 #define EFI_BUF_SIZE 512
71 static int detect_efi(int fd)
74 unsigned char *buffer = (unsigned char*)malloc(EFI_BUF_SIZE);
75 if(get_buffer(fd, buffer, EFI_BUF_OFFSET, EFI_BUF_SIZE) != 0)
77 if(!memcmp(buffer, "EFI PART", 8))
84 #define EXT2_BUF_SIZE 1024
85 static int detect_ext23(int fd)
88 unsigned char *buffer = (unsigned char*)malloc(EXT2_BUF_SIZE);
89 if(get_buffer(fd, buffer, 1024, EXT2_BUF_SIZE) != 0)
91 if(get_le_short(buffer + 56) == 0xEF53)
93 if(get_le_long(buffer + 92) & 0x0004)
95 if ((get_le_long(buffer + 96) < 0x0000040)
96 && (get_le_long(buffer + 100) < 0x0000008))
109 #define FAT_BUF_SIZE 512
110 static int detect_fat(int fd)
113 unsigned char *buffer = (unsigned char*)malloc(FAT_BUF_SIZE);
114 if(get_buffer(fd, buffer, 0, FAT_BUF_SIZE) != 0)
117 if (((((buffer[0] & 0xff) == 0xEB) && ((buffer[2] & 0xff) == 0x90)) || ((buffer[0] & 0xff) == 0xE9))
118 && ((buffer[510] & 0xff) == 0x55) /*&& ((buffer[511] & 0xff == 0xAA))*/
119 && (memcmp(buffer + 3, "NTFS ", 8)))
126 #define HFSPLUS_VOL_JOURNALED (1 << 13)
127 #define HFSPLUS_BUF_SIZE 512
128 static int detect_hfsplus(int fd)
131 unsigned short magic;
132 unsigned int journal;
133 unsigned char *buffer = (unsigned char*)malloc(HFSPLUS_BUF_SIZE);
134 if(get_buffer(fd, buffer, 1024, HFSPLUS_BUF_SIZE) != 0)
136 magic = get_be_short(buffer);
137 journal = get_be_long(buffer + 4) & HFSPLUS_VOL_JOURNALED;
143 // ret = HFSPLUSJOURNAL;
150 #define NTFS_BUF_SIZE 512
151 static int detect_ntfs(int fd)
154 unsigned char *buffer = (unsigned char*)malloc(NTFS_BUF_SIZE);
155 if(get_buffer(fd, buffer, 0, NTFS_BUF_SIZE) != 0)
157 if(!memcmp(buffer + 3, "NTFS ", 8))
164 #define EXTENDED_BUF_SIZE 512
165 static int detect_extended(int fd)
168 unsigned char *buffer = (unsigned char*)malloc(MBR_BUF_SIZE);
169 if(get_buffer(fd, buffer, 0, 512) != 0)
171 if((((buffer[0] & 0xff) == 0xEB) && ((buffer[2] & 0xff) == 0x90)) || ((buffer[0] & 0xff) == 0xE9))
173 if(((buffer[510] & 0xff) == 0x55) && ((buffer[511] & 0xff) == 0xAA))
190 int detect_fs(char *device)
196 fd = open(device, O_RDONLY);
200 while((i < 6) && (ret == NONE))
201 ret = funcs[i++](fd);