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Calculates the checksum value of a buffer. Checksum is based on 1's compliment of the buffer content
buffer: A pointer to the buffer whose checksum has to be calculated
length: The Length of the above buffer
addressToIgnore: Range of addresses to be ignored in the buffer
return: Checksum value of the buffer
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ULONG CalculateChecksum ( PVOID buffer, ULONG length, ULONG* addressToIgnore ) { PUCHAR address; ULONG checksum; checksum = 0; address = (PUCHAR)buffer; while (length != 0) { if ((address >= (PUCHAR)addressToIgnore) && (address < (PUCHAR)(addressToIgnore + 1))) { } else { checksum += *address; } length -= 1; address += 1; } return ~checksum; }