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