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Add --device-size option for reencryption tool.

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This commit is contained in:
Milan Broz
2012-06-25 15:34:11 +02:00
parent c469e458b7
commit fb3b62ca02
5 changed files with 103 additions and 2 deletions
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64
lib/utils_crypt.c
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@@ -23,6 +23,8 @@
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
@@ -423,3 +425,65 @@ ssize_t crypt_hex_to_bytes(const char *hex, char **result, int safe_alloc)
*result = bytes;
return i;
}
/*
* Device size string parsing, suffixes:
* s|S - 512 bytes sectors
* k |K |m |M |g |G |t |T - 1024 base
* kiB|KiB|miB|MiB|giB|GiB|tiB|TiB - 1024 base
* kb |KB |mM |MB |gB |GB |tB |TB - 1000 base
*/
int crypt_string_to_size(struct crypt_device *cd, const char *s, uint64_t *size)
{
char *endp = NULL;
size_t len;
uint64_t mult_base, mult, tmp;
*size = strtoull(s, &endp, 10);
if (!isdigit(s[0]) ||
(errno == ERANGE && *size == ULLONG_MAX) ||
(errno != 0 && *size == 0))
return -EINVAL;
if (!endp)
return 0;
len = strlen(endp);
/* Allow "B" and "iB" suffixes */
if (len > 3 ||
(len == 3 && (endp[1] != 'i' || endp[2] != 'B')) ||
(len == 2 && endp[1] != 'B'))
return -EINVAL;
if (len == 1 || len == 3)
mult_base = 1024;
else
mult_base = 1000;
mult = 1;
switch (endp[0]) {
case 's':
case 'S': mult = 512;
break;
case 't':
case 'T': mult *= mult_base;
case 'g':
case 'G': mult *= mult_base;
case 'm':
case 'M': mult *= mult_base;
case 'k':
case 'K': mult *= mult_base;
break;
default:
return -EINVAL;
}
tmp = *size * mult;
if ((tmp / *size) != mult) {
log_dbg("Device size overflow.");
return -EINVAL;
}
*size = tmp;
return 0;
}