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| author | Jakub Zawadzki <darkjames-ws@darkjames.pl> | 2013-07-12 05:59:56 +0000 |
|---|---|---|
| committer | Jakub Zawadzki <darkjames-ws@darkjames.pl> | 2013-07-12 05:59:56 +0000 |
| commit | 7c9c79ca68f23ea6f394348acd578a96be828cfd (patch) | |
| tree | cee22cda433719001807d2055bc64d22132ef9b1 /epan/addr_and_mask.c | |
| parent | 4dcc156cf360c2e355349e539c28c867eef0f7d0 (diff) | |
Move bitmask array from ipv4_addr_set_netmask_bits() to ip_get_subnet_mask()
Use it in subnet_mask_lookup_init().
svn path=/trunk/; revision=50527
Diffstat (limited to 'epan/addr_and_mask.c')
| -rw-r--r-- | epan/addr_and_mask.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/epan/addr_and_mask.c b/epan/addr_and_mask.c index 854a96891f..fc32cef87d 100644 --- a/epan/addr_and_mask.c +++ b/epan/addr_and_mask.c @@ -31,6 +31,26 @@ #include "tvbuff.h" #include "addr_and_mask.h" +guint32 +ip_get_subnet_mask(const guint32 mask_length) +{ + static guint32 masks[33] = { + 0x00000000, + 0x80000000, 0xc0000000, 0xe0000000, 0xf0000000, + 0xf8000000, 0xfc000000, 0xfe000000, 0xff000000, + 0xff800000, 0xffc00000, 0xffe00000, 0xfff00000, + 0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000, + 0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000, + 0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00, + 0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0, + 0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff, + }; + + g_assert(mask_length <= 32); + + return masks[mask_length]; +} + /* * These routines return the length of the address in bytes on success * and -1 if the prefix length is too long. |