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-rw-r--r--toys/pending/blkid.c283
1 files changed, 98 insertions, 185 deletions
diff --git a/toys/pending/blkid.c b/toys/pending/blkid.c
index c5d6558b..e69d605b 100644
--- a/toys/pending/blkid.c
+++ b/toys/pending/blkid.c
@@ -18,199 +18,112 @@ config BLKID
#define FOR_blkid
#include "toys.h"
-#define BIT(x) (1<<(x))
-#define _MATCH(buf,type,offset,match) (((unsigned type *)&buf[offset])[0]==(match))
-#define MATCH2(b,a) (_MATCH(b,a##_TYPE,a##_OFFSET,a##_MAGIC2)||MATCH(b,a))
-#define MATCH3(b,a) (_MATCH(b,a##_TYPE,a##_OFFSET,a##_MAGIC3)||MATCH2(b,a))
-#define MATCH(b,a) _MATCH(b,a##_TYPE,a##_OFFSET,a##_MAGIC)
-/* may need to check endianess for C2I */
-#define C2I(a,b,c,d) (a|(b<<8)|(c<<16)|(d<<24))
-
-struct fs_info {
- unsigned uuid_off;
- unsigned lab_off;
- short uuid_t;
- short lab_len;
+struct fstype {
+ char *name;
+ uint64_t magic;
+ int magic_len, magic_offset, uuid_off, label_len, label_off;
};
-#define SET_FS(t) (struct fs_info)t##_INFO
-
-#define ADFS_MAGIC 0xadf5
-#define ADFS_TYPE short
-#define ADFS_OFFSET 0xc00
-#define ADFS_INFO {0,0,0,0} /*todo*/
-
-#define BFS_MAGIC 0x1badface
-#define BFS_TYPE long
-#define BFS_OFFSET 0
-#define BFS_INFO {0,0,0,0}
-
-/*won't fit in 1 toybuf*/
-#define BTRFS_MAGIC C2I('_','B','H','R') //'RHB_'
-//#define BTRFS_MAGIC2 'M_Sf' /*not currently used*/
-//#define BTRFS_OFFSET2 65604 /*not currently used*/
-#define BTRFS_TYPE long /*change to long long if full magic used?*/
-#define BTRFS_OFFSET 65600
-#define BTRFS_INFO {65803,65819,16,256}
-
-#define CRAMFS_MAGIC 0x28cd3d45
-#define CRAMFS_MAGIC2 0x453dcd28
-#define CRAMFS_TYPE long
-#define CRAMFS_OFFSET 0
-#define CRAMFS_INFO {0,48,0,16}
-
-#define EXT_MAGIC 0xEF53
-#define EXT_MAGIC2 0xEF51
-#define EXT_MAGIC3 0x53EF
-#define EXT_TYPE short
-#define EXT_OFFSET 1080
-#define EXT3_BYTE 1116
-#define EXT4_BYTE 1120
-#define EXT_INFO {1128,1144,16,16}
-
-#define F2FS_MAGIC 0xF2F52010
-#define F2FS_TYPE long
-#define F2FS_OFFSET 1024
-#define F2FS_INFO {1132,1110,16,16}
-
-/*won't fit in 1 toybuf*/
-#define JFS_MAGIC C2I('J','S','F','1') //'1SFJ'
-#define JFS_TYPE long
-#define JFS_OFFSET 32768
-#define JFS_INFO {32920,32904,16,16}
-
-#define NILFS_MAGIC 0x3434
-#define NILFS_TYPE short
-#define NILFS_OFFSET 1030
-#define NILFS_INFO {1176,1192,16,80}
-
-#define NTFS_MAGIC C2I('N','T','F','S') //'SFTN'
-#define NTFS_TYPE long
-#define NTFS_OFFSET 3
-#define NTFS_INFO {0x48,0X4D80,8,-8}
-
-/*won't fit in 1 toybuf*/
-#define REISER_MAGIC C2I('R','e','I','s') //'sIeR'
-#define REISER_TYPE long
-#define REISER_OFFSET 8244
-#define REISER_INFO {8276,8292,16,16}
-
-#define REISERB_MAGIC REISER_MAGIC //'sIeR'
-#define REISERB_TYPE REISER_TYPE
-#define REISERB_OFFSET 65588
-#define REISERB_INFO {65620,65636,16,16}
-
-#define ROMFS_MAGIC C2I('r','o','m','-') //'-mor'
-#define ROMFS_OFFSET 0
-#define ROMFS_TYPE long
-#define ROMFS_INFO {0,0,0,0}
-
-#define SQUASHFS_OFFSET 0
-#define SQUASHFS_TYPE long
-#define SQUASHFS_MAGIC 0x73717368
-#define SQUASHFS_INFO {0,0,0,0}
-
-#define XIAFS_OFFSET 572
-#define XIAFS_TYPE long
-#define XIAFS_MAGIC 0x012FD16D
-#define XIAFS_INFO {0,0,0,0}
-
-#define XFS_OFFSET 0
-#define XFS_TYPE long
-#define XFS_MAGIC C2I('X','F','S','B')
-#define XFS_INFO {32,108,16,12}
-
-/* hack for NTFS utf16 */
-char *toutf8(unsigned short *ws)
-{
- static char buf[16];
- int i=0;
-
- while((buf[i++]=*ws++));
- return buf;
-}
+static const struct fstype fstypes[] = {
+ // ext3 = buf[1116]&4 ext4 = buf[1120]&64
+ {"ext2", 0xEF53, 2, 1080, 1128, 16, 1144},
+ // label actually 8/16 0x4d80 but horrible: 16 bit wide characters via
+ // codepage, something called a uuid that's only 8 bytes long...
+ {"ntfs", 0x5346544e, 4, 3, 0x48+(8<<24), 0, 0},
+
+ {"adfs", 0xadf5, 2, 0xc00, 0,0,0},
+ {"bfs", 0x1badface, 4, 0, 0,0,0},
+ {"btrfs", 0x4D5F53665248425FULL, 8, 65600, 65803, 256, 65819},
+ {"cramfs", 0x28cd3d45, 4, 0, 0, 16, 48},
+ {"f2fs", 0xF2F52010, 4, 1024, 1132, 16, 1110},
+ {"jfs", 0x3153464a, 4, 32768, 32920, 16, 32904},
+ {"nilfs", 0x3434, 2, 1030, 1176, 80, 1192},
+ {"murderfs", 0x724573496552, 6, 8244, 8276, 16, 8292},
+ {"murderfs", 0x724573496552, 6, 65588, 65620, 16, 65536},
+ {"romfs", 0x2d6d6f72, 4, 0, 0,0,0},
+ {"squashfs", 0x73717368, 4, 0, 0,0,0},
+ {"xiafs", 0x012fd16d, 4, 572, 0,0,0},
+ {"xfs", 0x42534658, 4, 0, 32, 12, 108},
+ {"vfat", 0x3233544146, 5, 82, 67+(4<<24), 11, 71}, // fat32
+ {"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
+};
/* TODO if no args use proc/partitions */
void do_blkid(int fd, char *name)
{
- struct fs_info fs;
- char *fstype;
- unsigned char buf[66560]; /*toybuf is only 4096, could rework logic*/
- int sb_read;
-
- sb_read = read(fd, &buf, sizeof(buf));
- if (sb_read < 1) return;
-
- if MATCH(buf,ADFS) {
- fstype="adfs";
- if (CFG_BLKID) fs=SET_FS(ADFS);
- } else if MATCH(buf,BFS) {
- fstype="bfs";
- if (CFG_BLKID) fs=SET_FS(BFS);
- } else if MATCH(buf,CRAMFS) {
- fstype="cramfs";
- if (CFG_BLKID) fs=SET_FS(CRAMFS);
- } else if MATCH3(buf,EXT) {
- fstype=(buf[EXT3_BYTE]&BIT(2))?((buf[EXT4_BYTE]&BIT(6))?"ext4":"ext3"):"ext2";
- if (CFG_BLKID) fs=SET_FS(EXT);
- } else if MATCH(buf,F2FS) {
- fstype="f2fs";
- if (CFG_BLKID) fs=SET_FS(F2FS);
- } else if MATCH(buf,NILFS) {
- fstype="nilfs";
- if (CFG_BLKID) fs=SET_FS(NILFS);
- } else if MATCH(buf,NTFS) {
- fstype="ntfs";
- if (CFG_BLKID) fs=SET_FS(NTFS);
- } else if MATCH(buf,XIAFS) {
- fstype="xiafs";
- if (CFG_BLKID) fs=SET_FS(XIAFS);
-/*below here would require more than 1 toybuf*/
- } else if MATCH(buf,REISER) {
- fstype="reiserfs";
- if (CFG_BLKID) fs=SET_FS(REISER);
- } else if MATCH(buf,JFS) {
- fstype="jfs";
- if (CFG_BLKID) fs=SET_FS(JFS);
- } else if MATCH(buf,BTRFS) {
- fstype="btrfs";
- if (CFG_BLKID) fs=SET_FS(BTRFS);
- } else if MATCH(buf,REISERB) {
- fstype="reiserfs";
- if (CFG_BLKID) fs=SET_FS(REISERB);
- } else return;
-
- if (CFG_BLKID && !strncmp("blkid",toys.which->name,5) ) {
- printf("%s:",name);
- if (fs.lab_len > 0)
- printf(" LABEL=\"%.*s\"", fs.lab_len, (char *)&buf[fs.lab_off]);
- else if (fs.lab_len < 0)
- printf(" LABEL=\"%.*s\"", -fs.lab_len,
- toutf8((unsigned short *)&buf[fs.lab_off]));
- if (fs.uuid_off > 0) {
- if (fs.uuid_t == 16)
- printf(" UUID=\"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
- "%02x%02x%02x%02x%02x%02x\"",
- buf[fs.uuid_off], buf[fs.uuid_off+1],
- buf[fs.uuid_off+2], buf[fs.uuid_off+3],
- buf[fs.uuid_off+4], buf[fs.uuid_off+5],
- buf[fs.uuid_off+6], buf[fs.uuid_off+7],
- buf[fs.uuid_off+8], buf[fs.uuid_off+9],
- buf[fs.uuid_off+10], buf[fs.uuid_off+11],
- buf[fs.uuid_off+12], buf[fs.uuid_off+13],
- buf[fs.uuid_off+14], buf[fs.uuid_off+15]);
- if (fs.uuid_t == 8)
- printf(" UUID=\"%02X%02X%02X%02X%02X%02X%02X%02X\"",
- buf[fs.uuid_off+7], buf[fs.uuid_off+6],
- buf[fs.uuid_off+5], buf[fs.uuid_off+4],
- buf[fs.uuid_off+3], buf[fs.uuid_off+2],
- buf[fs.uuid_off+1], buf[fs.uuid_off]);
+ int off, i, j;
+ char *type;
+
+ off = i = 0;
+
+ for (;;) {
+ int pass = 0, len;
+
+ // Read next block of data
+ len = readall(fd, toybuf, sizeof(toybuf));
+ if (len != sizeof(toybuf)) return;
+
+ // Iterate through types in range
+ for (i=0; i < sizeof(fstypes)/sizeof(struct fstype); i++) {
+ uint64_t test;
+
+ // Skip tests not in this 4k block
+ if (fstypes[i].magic_offset > off+sizeof(toybuf)) {
+ pass++;
+ continue;
+ }
+ if (fstypes[i].magic_offset < off) continue;
+
+ // Populate 64 bit little endian magic value
+ test = 0;
+ for (j = 0; j < fstypes[i].magic_len; j++)
+ test += ((uint64_t)toybuf[j+fstypes[i].magic_offset-off])<<(8*j);
+ if (test == fstypes[i].magic) break;
}
- printf(" TYPE=\"%s\"",fstype);
- /* avoid printf overhead in fstype */
- } else write(1,fstype,strlen(fstype));
- putchar('\n');
+ if (i == sizeof(fstypes)/sizeof(struct fstype)) {
+ off += len;
+ if (pass) continue;
+ return;
+ }
+ break;
+ }
+
+ // distinguish ext2/3/4
+ type = fstypes[i].name;
+ if (!i) {
+ if (toybuf[1116]&4) type = "ext3";
+ if (toybuf[1120]&64) type = "ext4";
+ }
+
+ // Could special case NTFS here...
+
+ // Output for fstype
+ if (*toys.which->name == 'f') {
+ puts(type);
+ return;
+ }
+
+ // output for blkid
+ printf("%s:",name);
+
+ if (fstypes[i].label_len)
+ printf(" LABEL=\"%.*s\"", fstypes[i].label_len,
+ toybuf+fstypes[i].label_off-off);
+
+ if (fstypes[i].uuid_off) {
+ int bits = 0x550, size = fstypes[i].uuid_off >> 24,
+ uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off;
+
+ if (size) bits = 4*(size == 4);
+ else size = 16;
+
+ printf(" UUID=\"");
+ for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
+ printf("\"");
+ }
+
+ printf(" TYPE=\"%s\"\n", fstypes[i].name);
}
void blkid_main(void)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 08:19:10 +0000