fs/cachefiles/key.c

16 	"0123456789"			/* 0 - 9 */
17 	"abcdefghijklmnopqrstuvwxyz"	/* 10 - 35 */
18 	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"	/* 36 - 61 */
19 	"_-"				/* 62 - 63 */
24 	[33 ... 46] = 1,		/* '!' -> '.' */
26 	[48 ... 127] = 1,		/* '0' -> '~' */
31  * - the raw key should include the length in the two bytes at the front
32  * - the key may be up to 514 bytes in length (including the length word)
33  *   - "base64" encode the strange keys, mapping 3 bytes of raw to four of
35  *   - need to cut the cooked key into 252 char lengths (189 raw bytes)
42 	int loop, len, max, seg, mark, print;  in cachefiles_cook_key()  local
57 		/* if the path is usable ASCII, then we render it directly */  in cachefiles_cook_key()
58 		max = keylen - 2;  in cachefiles_cook_key()
59 		max += 2;	/* two base64'd length chars on the front */  in cachefiles_cook_key()
60 		max += 5;	/* @checksum/M */  in cachefiles_cook_key()
61 		max += 3 * 2;	/* maximum number of segment dividers (".../M")  in cachefiles_cook_key()
64 		max += 1;	/* NUL on end */  in cachefiles_cook_key()
69 		max = keylen * 4;  in cachefiles_cook_key()
70 		max += 5;	/* @checksum/M */  in cachefiles_cook_key()
71 		max += 3 * 2;	/* maximum number of segment dividers (".../M")  in cachefiles_cook_key()
74 		max += 1;	/* NUL on end */  in cachefiles_cook_key()
77 	max += 1;	/* 2nd NUL on end */  in cachefiles_cook_key()
79 	_debug("max: %d", max);  in cachefiles_cook_key()
81 	key = kmalloc(max, GFP_KERNEL);  in cachefiles_cook_key()
90 	mark = len - 1;  in cachefiles_cook_key()
102 		for (loop = keylen; loop > 0; loop--) {  in cachefiles_cook_key()
111 			ASSERT(len < max);  in cachefiles_cook_key()
121 		for (loop = keylen; loop > 0; loop--) {  in cachefiles_cook_key()
143 			ASSERT(len < max);  in cachefiles_cook_key()