| 0,0 → 1,40 |
|---|
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| ;; ;; |
| ;; Copyright (C) KolibriOS team 2004-2017. All rights reserved. ;; |
| ;; Distributed under terms of the GNU General Public License. ;; |
| ;; ;; |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| |
| ; This crc32 routine doesn't use precomputed table to allow different |
| ; polynomials, which is the first param. |
| ; Partial hash in assumed to be eax (both in and out). |
| ; Usage: |
| ; 1. mov eax, -1 |
| ; 2. stdcall crypto.crc32 zero or more times |
| ; 3. xor eax, -1 |
| proc crc_32 _poly, _buffer, _length |
| push ebx ecx edx esi |
| |
| mov esi, [_buffer] |
| .next_byte: |
| dec [_length] |
| js .done |
| movzx ebx, byte[esi] |
| inc esi |
| mov ecx, 8 |
| .next_bit: |
| mov edx, eax |
| xor edx, ebx |
| shr eax, 1 |
| test edx, 1 |
| jz @f |
| xor eax, [_poly] |
| @@: |
| shr ebx, 1 |
| dec ecx |
| jnz .next_bit |
| jmp .next_byte |
| .done: |
| pop esi edx ecx ebx |
| ret |
| endp |
| Property changes: |
|---|
| Added: svn:eol-style |
|---|
| +native |
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| \ No newline at end of property |
|---|