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(tar_from_header): ckd_mul() and ckd_add() rather than doing it by hand.

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(LG_64): Remove; no longer used.

Sync with GNU tar 414f635d8bba4c8894855040b1e6b77b07dc07bd.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
This commit is contained in:
Andrew Borodin 2024-09-01 12:23:41 +03:00
parent b9e7ab2f08
commit 79b10fc8a7
1 changed files with 4 additions and 7 deletions
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11
src/vfs/tar/tar-internal.c
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@ -46,7 +46,6 @@
/* Log base 2 of common values. */
#define LG_8 3
#define LG_64 6
#define LG_256 8
/*** file scope type declarations ****************************************************************/
@ -313,12 +312,10 @@ tar_from_header (const char *where0, size_t digs, char const *type, intmax_t min
if (where == lim || !is_octal_digit (*where))
break;
digit = *where - '0';
overflow |= value != (value << LG_8 >> LG_8);
value <<= LG_8;
overflow |= ckd_mul (&value, value, 8);
}
value++;
overflow |= value == 0;
overflow |= ckd_add (&value, value, 1);
if (!overflow && value <= minus_minval)
negative = TRUE;
@ -342,9 +339,9 @@ tar_from_header (const char *where0, size_t digs, char const *type, intmax_t min
while (where != lim && (dig = base64_map[(unsigned char) *where]) < 64)
{
if (value << LG_64 >> LG_64 != value)
if (ckd_mul (&value, value, 64))
return (-1);
value = (value << LG_64) | dig;
value |= dig;
where++;
}
}