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Moved PDU::pseudoheader_checksum and PDU::do_checksum to Utils namespace.

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This commit is contained in:
Matias Fontanini
2011-09-07 09:52:58 -03:00
parent a216cf8401
commit f30f404632
7 changed files with 51 additions and 52 deletions
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25
src/utils.cpp
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@@ -252,6 +252,31 @@ uint16_t Tins::Utils::channel_to_mhz(uint16_t channel) {
return 2407 + (channel * 5);
}
uint32_t Tins::Utils::do_checksum(uint8_t *start, uint8_t *end) {
uint32_t checksum(0);
uint16_t *ptr = (uint16_t*)start, *last = (uint16_t*)end, padding(0);
if(((end - start) & 1) == 1) {
last = (uint16_t*)end - 1;
padding = *(end - 1) << 8;
}
while(ptr < last)
checksum += Utils::net_to_host_s(*(ptr++));
return checksum + padding;
}
uint32_t Tins::Utils::pseudoheader_checksum(uint32_t source_ip, uint32_t dest_ip, uint32_t len, uint32_t flag) {
uint32_t checksum(0);
source_ip = Utils::net_to_host_l(source_ip);
dest_ip = Utils::net_to_host_l(dest_ip);
uint16_t *ptr = (uint16_t*)&source_ip;
checksum += (uint32_t)(*ptr) + (uint32_t)(*(ptr+1));
ptr = (uint16_t*)&dest_ip;
checksum += (uint32_t)(*ptr) + (uint32_t)(*(ptr+1));
checksum += flag + len;
return checksum;
}
uint32_t Tins::Utils::crc32(uint8_t* data, uint32_t data_size) {
uint32_t i, crc = 0;
static uint32_t crc_table[] = {