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Trailing dangling byte in checksum should be considered MSB.

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likewise 2005-12-14 22:29:03 +00:00
parent 319a972e75
commit 6facaf8f05
1 changed files with 3 additions and 2 deletions
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5
src/core/inet.c
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@ -51,7 +51,7 @@
/* This is a reference implementation of the checksum algorithm, with the /* This is a reference implementation of the checksum algorithm, with the
* aim of being simple, correct and fully portable. Checksumming is the * aim of being simple, correct and fully portable. Checksumming is the
* first thing you would want to optimize for your platform. You will * first thing you would want to optimize for your platform. You will
* need to port it to your architecture and in your sys_arch.h:\ * need to port it to your architecture and in your sys_arch.h:
* *
* #define LWIP_CHKSUM <your_checksum_routine> * #define LWIP_CHKSUM <your_checksum_routine>
*/ */
@ -93,7 +93,8 @@ lwip_standard_chksum(void *dataptr, u16_t len)
if (len > 0) if (len > 0)
{ {
/* accumulate remaining octet */ /* accumulate remaining octet */
acc += (*octetptr); src = (*octetptr) << 8;
acc += src;
} }
/* add deferred carry bits */ /* add deferred carry bits */
acc = (acc >> 16) + (acc & 0x0000ffffUL); acc = (acc >> 16) + (acc & 0x0000ffffUL);