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|
; asm_utils_win32_x86.asm
; Functions optionally implemented in assembler
;
; Wireshark - Network traffic analyzer
; By Gerald Combs <gerald@wireshark.org>
; Copyright 1998 Gerald Combs
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation; either version 2
; of the License, or (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
;
SECTION .text
GLOBAL _wrs_strcmp
GLOBAL _wrs_strcmp_with_data
GLOBAL _wrs_str_equal
GLOBAL _wrs_check_charset
GLOBAL _wrs_str_hash
align 16
_wrs_strcmp:
_wrs_strcmp_with_data:
mov ecx, dword [esp + 4] ; a
mov edx, dword [esp + 8] ; b
push ebx
CMP_LOOP:
mov eax, dword [ecx]
mov ebx, dword [edx]
cmp al, bl
jne CMP_NEQ_END
or al, al
jz CMP_EQ_END
cmp ah, bh
jne CMP_NEQ_END
or ah, ah
jz CMP_EQ_END
shr eax, 16
shr ebx, 16
add ecx, byte 4
add edx, byte 4
cmp al, bl
jne CMP_NEQ_END
or al, al
jz CMP_EQ_END
cmp ah, bh
jne CMP_NEQ_END
or ah, ah
jnz CMP_LOOP
CMP_EQ_END:
pop ebx
xor eax, eax
retn
CMP_NEQ_END:
; returns 1 or -1 based on CF flag from the last comparision
sbb eax, eax
pop ebx
shl eax, 1
inc eax
retn
align 16
_wrs_str_equal:
mov ecx, dword [esp + 4] ; a
mov edx, dword [esp + 8] ; b
push ebx
EQL_LOOP:
mov eax, dword [ecx]
mov ebx, dword [edx]
cmp al, bl
jne EQL_NEQ_END
or al, al
jz EQL_EQ_END
cmp ah, bh
jne EQL_NEQ_END
or ah, ah
jz EQL_EQ_END
shr eax, 16
shr ebx, 16
add ecx, byte 4
add edx, byte 4
cmp al, bl
jne EQL_NEQ_END
or al, al
jz EQL_EQ_END
cmp ah, bh
jne EQL_NEQ_END
or ah, ah
jnz EQL_LOOP
EQL_EQ_END:
xor eax, eax
pop ebx
not eax
retn
EQL_NEQ_END:
pop ebx
xor eax, eax
retn
align 16
_wrs_check_charset:
mov edx, dword [esp + 4] ; table
mov ecx, dword [esp + 8] ; str
push edi
push ebx
mov edi, edx
mov bl, byte 0xFF
CHK_LOOP:
mov eax, dword [ecx]
movzx edx, al
test bl, byte [edi+edx]
jz CHK_AL_END
movzx edx, ah
test bl, byte [edi+edx]
jz CHK_AH_END
shr eax, 16
add ecx, byte 4
movzx edx, al
test bl, byte [edi+edx]
jz CHK_AL_END
movzx edx, ah
test bl, byte [edi+edx]
jnz CHK_LOOP
CHK_AH_END:
movzx eax, ah
pop ebx
pop edi
retn
CHK_AL_END:
movzx eax, al
pop ebx
pop edi
retn
align 16
_wrs_str_hash:
mov edx, dword [esp + 4] ; v
push ebx
xor eax, eax
mov ecx, dword [edx]
or cl, cl
movzx ebx, cl
jz HASH_END
HASH_LOOP:
sub ebx, eax
shl eax, 5
add eax, ebx
or ch, ch
movzx ebx, ch
jz HASH_END
sub ebx, eax
shl eax, 5
add eax, ebx
shr ecx, 16
add edx, byte 4
or cl, cl
movzx ebx, cl
jz HASH_END
sub ebx, eax
shl eax, 5
add eax, ebx
or ch, ch
movzx ebx, ch
jz HASH_END
sub ebx, eax
shl eax, 5
add eax, ebx
mov ecx, dword [edx]
or cl, cl
movzx ebx, cl
jnz HASH_LOOP
HASH_END:
pop ebx
retn
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