diff options
author | Michael Mann <mmann78@netscape.net> | 2015-03-01 10:46:31 -0500 |
---|---|---|
committer | Anders Broman <a.broman58@gmail.com> | 2015-03-03 05:12:10 +0000 |
commit | 43fd878c4e4d726dd4604ade4c0548eed783c4f3 (patch) | |
tree | 0f891fdab1f18e128ae1cd49b400c4ff74aed82d /epan/dissectors/packet-assa_r3.c | |
parent | 091d2db3d71aa30b6d0c7cc664349797da3ef865 (diff) |
Add "seed" capabilities to crc16_x25_ccitt (now crc16_x25_ccitt_seed) so we can remove CRC algorithm calculation in packet-assa_r3.c.
Change-Id: I3143800f6ff922a309f5506d9acbc2c4293363b7
Reviewed-on: https://code.wireshark.org/review/7490
Reviewed-by: Jeff Morriss <jeff.morriss.ws@gmail.com>
Petri-Dish: Jeff Morriss <jeff.morriss.ws@gmail.com>
Reviewed-by: Anders Broman <a.broman58@gmail.com>
Diffstat (limited to 'epan/dissectors/packet-assa_r3.c')
-rw-r--r-- | epan/dissectors/packet-assa_r3.c | 62 |
1 files changed, 3 insertions, 59 deletions
diff --git a/epan/dissectors/packet-assa_r3.c b/epan/dissectors/packet-assa_r3.c index 3d69586c1c..536605c39d 100644 --- a/epan/dissectors/packet-assa_r3.c +++ b/epan/dissectors/packet-assa_r3.c @@ -28,6 +28,7 @@ #include <epan/packet.h> #include <epan/expert.h> +#include <epan/crc16-tvb.h> #include "packet-tcp.h" void proto_register_r3(void); @@ -3543,60 +3544,6 @@ static void (*r3upstreammfgfield_dissect []) (tvbuff_t *tvb, guint32 start_offse /* * *************************************************************************** - * - * Cannot use wsutil/crc routines as ccitt-x25 uses a starting value of 0xffff - * and we use 0x0000 (legacy compatibility). If an override method to set - * the starting value existed, these could be replaced. - */ -static const guint16 ccitt_16 [256] = -{ - 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, - 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, - 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, - 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, - 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, - 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, - 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, - 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, - 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, - 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, - 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, - 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, - 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, - 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, - 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, - 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, - 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, - 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, - 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, - 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, - 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, - 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, - 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, - 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, - 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, - 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, - 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, - 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, - 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, - 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, - 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, - 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 -}; - -static guint16 -utilCrcCalculate (const void *ptr, guint16 len, guint16 crc) -{ - const guint8 *p = (const guint8 *) ptr; - - while (len--) - crc = (guint16) ((crc << 8) ^ ccitt_16 [(crc >> 8) ^ *p++]); - - return crc; -} - -/* - * *************************************************************************** */ static void dissect_serialnumber (tvbuff_t *tvb, guint32 start_offset, guint32 length _U_, packet_info *pinfo _U_, proto_tree *tree, int hf_index) @@ -5977,10 +5924,7 @@ dissect_r3_cmd_downloadfirmware (tvbuff_t *tvb, guint32 start_offset, guint32 le packetCRC = tvb_get_letohs (payload_tvb, cmdLen - 2 - 2); - if ((calculatedCRC = utilCrcCalculate (tvb_get_ptr (payload_tvb, 0, cmdLen - 2 - 2), - cmdLen - 2, - 0x0000)) - == packetCRC) + if ((calculatedCRC = crc16_r3_ccitt_tvb(payload_tvb, 0, cmdLen - 2 - 2)) == packetCRC) proto_tree_add_uint_format_value(dlfw_tree, hf_r3_firmwaredownload_crc, payload_tvb, cmdLen - 2 - 2, 2, packetCRC, "0x%04x (correct)", packetCRC); @@ -6709,7 +6653,7 @@ dissect_r3_packet (tvbuff_t *tvb, packet_info *pinfo, proto_tree *r3_tree) guint32 packetXor = tvb_get_guint8 (tvb, offset + 2); guint32 calculatedCRC; - if ((calculatedCRC = utilCrcCalculate (tvb_get_ptr (tvb, 1, packetLen - 3), packetLen - 3, 0x0000)) == packetCRC) + if ((calculatedCRC = crc16_r3_ccitt_tvb(tvb, 1, packetLen - 3)) == packetCRC) proto_tree_add_uint_format_value(tail_tree, hf_r3_crc, tvb, offset, 2, packetCRC, "0x%04x (correct)", packetCRC); else { |