204 lines
3.6 KiB
PHP
204 lines
3.6 KiB
PHP
; in: ebx -> pattern (not empty zero-terminated string), esi -> translation table,
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; dword [esp+4] = encoding, byte [esp+8] non-zero for whole words only
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; out: edx and ecx -> preprocessed data
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; when search will be done, edx must be pgfree()d
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search_string_pre:
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; FSM is used, number of states is limited by 256, so pattern length must be <= 255
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; anyway, for big patterns FSM uses too many memory, so probably it is not best choice
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; get pattern length, m
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or ecx, -1
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@@:
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inc ecx
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cmp byte [ecx+ebx], 0
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jnz @b
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cmp byte [esp+8], 0
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jz @f
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inc ecx
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inc ecx
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@@:
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push ecx
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; allocate m*257 bytes for FSM and prefix function
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imul ecx, 257
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call xpgalloc
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pop ecx
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test eax, eax
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jnz @f
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ret 8
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@@:
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shl ecx, 8
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push eax
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add eax, ecx
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; calculate prefix function
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xor ecx, ecx
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mov byte [eax], cl
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xor edi, edi
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cmp byte [esp+4+8], 0
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jnz .whole.prefixcalc
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.prefixcalc:
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inc edi
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movzx edx, byte [ebx+edi]
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mov dl, [esi+edx]
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test dl, dl
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jz .prefixdone
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@@:
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push eax
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movzx eax, byte [ebx+ecx]
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cmp dl, [esi+eax]
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pop eax
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jz @f
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jecxz .prefixint
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mov cl, byte [eax+ecx-1]
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jmp @b
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@@:
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inc ecx
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.prefixint:
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mov [eax+edi], cl
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jmp .prefixcalc
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.whole.prefixcalc:
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inc edi
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movzx edx, byte [ebx+edi-1]
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mov dl, [esi+edx]
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test dl, dl
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jz .whole.prefixdone
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.whole.prefixloop:
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jecxz .whole.testfirst
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push eax
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movzx eax, byte [ebx+ecx-1]
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cmp dl, [esi+eax]
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pop eax
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jz @f
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mov cl, byte [eax+ecx-1]
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jmp .whole.prefixloop
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.whole.testfirst:
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cmp [isspace_table+edx], 0
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jz .whole.prefixint
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@@:
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inc ecx
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.whole.prefixint:
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mov [eax+edi], cl
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jmp .whole.prefixcalc
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.whole.prefixdone:
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jecxz @f
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push eax
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movzx eax, byte [ebx+ecx-1]
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mov al, [esi+eax]
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cmp [isspace_table+eax], 0
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pop eax
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jnz @f
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mov cl, byte [eax+ecx-1]
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jmp .whole.prefixdone
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@@:
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inc ecx
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mov [eax+edi], cl
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.prefixdone:
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pop edx
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; create reverse table for encoding+translation
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push ebp
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movzx ebp, byte [esp+8]
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cmp ebp, encodings.unicode
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jb @f
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xor ebp, ebp ; no translations for Unicode encodings,
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; they must be handled separately by caller
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@@:
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mov ecx, 256
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@@:
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push 0
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loop @b
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push ebx eax
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mov ebx, esp
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shl ebp, 7
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xor eax, eax
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.createrev:
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dec cl
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mov al, cl
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jns @f
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mov al, byte [encodings.tables+ebp+ecx-80h]
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@@:
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mov al, [esi+eax]
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pushd [ebx+8+eax*4]
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pushd ecx
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mov [ebx+8+eax*4], esp
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jnz .createrev
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@@:
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dec cl
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mov al, [esi+ecx]
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pushd [ebx+8+eax*4]
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popd [ebx+8+ecx*4]
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jnz @b
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; create FSM
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xor ecx, ecx
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cmp byte [ebx+259*4+8], 0
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mov eax, [ebx]
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mov ebx, [ebx+4]
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mov edi, edx
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jz .fsmcalc
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mov esi, isspace_table
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push 256/4
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pop ecx
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rep movsd
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inc ecx
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.fsmcalc:
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movzx esi, byte [eax+ecx]
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push eax
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push ecx
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push 256/4
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pop ecx
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dec esi
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js .fsmzero
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shl esi, 8
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add esi, edx
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rep movsd
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jmp .fsmnext
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.fsmzero:
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cmp byte [esp+261*4+256*8+8], 0
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jnz .whole.fsmzero
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xor eax, eax
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rep stosd
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jmp .fsmnext
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.whole.fsmzero:
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mov esi, edx
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rep movsd
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.fsmnext:
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pop ecx
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movzx esi, byte [ebx]
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inc ecx
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mov esi, [esp+4+8*256+8+esi*4]
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@@:
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test esi, esi
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jz @f
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lodsd
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mov [edi-256+eax], cl
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mov esi, [esi]
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jmp @b
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@@:
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inc ebx
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pop eax
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cmp byte [ebx], 0
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jnz .fsmcalc
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cmp byte [esp+259*4+256*8+8], 0
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jz .nowholefin
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movzx esi, byte [eax+ecx]
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push ecx
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mov ecx, 256
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push 256/4
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pop ecx
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dec esi
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shl esi, 8
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add esi, edx
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rep movsd
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pop ecx
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inc ecx
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xor eax, eax
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.whole.fsmfin:
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cmp [isspace_table+eax], ah
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jz @f
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mov byte [edi-256+eax], cl
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@@:
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inc al
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jnz .whole.fsmfin
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.nowholefin:
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; ok, now edx -> FSM, cl = final state
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add esp, 8*256+8+4*256
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pop ebp
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ret 8
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