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3115 dunkaist 1 
proc crash.crc32 _crc, _data, _len, _callback, _msglen
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  .begin:
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	mov	ecx, [_len]
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	test	ecx, ecx
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	jz	.callback
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	mov	eax, [_crc]
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	mov	eax, [eax]
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	mov	esi, [_data]
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  .head:
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	mov	ebx, [_data]
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	and	ebx, 3
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	jz	.body
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    @@:
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	dec	ecx
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	js	.done
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	movzx	edx, al
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	xor	dl, byte[esi]
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	add	esi, 1
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	shr	eax, 8
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	xor	eax, [crash._.crc32_table + edx*4]
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	dec	ebx
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	jnz	@b
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  .body:
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	mov	ebx, ecx
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	and	ecx, 15
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	shr	ebx, 4
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	test	ebx, ebx
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	jz	.tail
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    @@:
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repeat 4
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	mov	edx, eax
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	mov	eax, [esi]
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	add	esi, 4
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	xor	eax, edx
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repeat 4
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	movzx	edx, al
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	shr	eax, 8
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	xor	eax, [crash._.crc32_table + edx*4]
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end repeat
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end repeat
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	dec	ebx
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	jnz	@b
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  .tail:
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	test	ecx, ecx
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	jz	.done
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    @@:
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	movzx	edx, al
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	xor	dl, byte[esi]
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	add	esi, 1
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	shr	eax, 8
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	xor	eax, [crash._.crc32_table + edx*4]
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	dec	ecx
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	jnz	@b
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  .done:
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	mov	ecx, [_crc]
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	mov	[ecx], eax
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  .callback:
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	mov	eax, [_callback]
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	test	eax, eax
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	jz	@f
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	call	eax
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	mov	[_len], eax
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	test	eax, eax
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	jnz	.begin
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    @@:
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	mov	ecx, [_crc]
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	mov	eax, [ecx]
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	xor	eax, 0xffffffff
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	bswap	eax
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	mov	[ecx], eax
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	ret
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endp