forked from KolibriOS/kolibrios
152 lines
2.5 KiB
NASM
152 lines
2.5 KiB
NASM
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file_handler:
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.position=0
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.size=4
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.bufer_block=8
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.operation=12
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.first_block=16
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.n_blocks=20
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.bufer=24
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.work_area=28
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.name=32
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.st_size=32+128
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open: ;esi=name_string
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;retorna eax
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pushad
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push dword [work_area]
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mov ecx,512 ;bufer
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call malloc
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push edi
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mov ecx,file_handler.st_size
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call mallocz
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pop dword[edi+file_handler.bufer]
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pop dword[edi+file_handler.work_area]
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mov [esp+28],edi
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mov ecx,100
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add edi,file_handler.name
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call movedata
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mov edi,[esp+28]
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mov byte[edi+file_handler.n_blocks],1
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mov eax,58
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lea ebx,[edi+file_handler.operation]
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push edi
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int 0x40
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pop edi
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test eax,eax
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jnz close.b
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mov [edi+file_handler.size],ebx
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clc
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popad
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ret
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close:
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pushad
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.b:
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mov eax,[esp+28]
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mov edi,[eax+file_handler.bufer]
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call free
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mov edi,eax
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call free
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popad
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xor eax,eax
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ret
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read: ;(f,bufer,nbytes) eax,edi,ecx ncr
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;retorna bytes leidos en ecx
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pushad
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mov edx,[eax+file_handler.size]
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sub edx,[eax+file_handler.position]
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cmp edx,ecx
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jnc .nb_ok
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mov ecx,edx
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mov [esp+24],edx
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.nb_ok:
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jecxz .final
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mov byte[eax+file_handler.operation],0
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test dword[eax+file_handler.position],511
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jz .l1
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call .bufer
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.l1:
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mov edx,ecx
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shr edx,9
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jz .l2
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mov [eax+file_handler.n_blocks],edx
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mov edx,[eax+file_handler.position]
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shr edx,9
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mov [eax+file_handler.first_block],edx
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xchg edi,[eax+file_handler.bufer]
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pushad
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lea ebx,[eax+file_handler.operation]
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mov eax,58
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int 40h
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cmp eax,0ffffff00h
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jnc .error
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popad
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xchg edi,[eax+file_handler.bufer]
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mov edx,ecx
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and edx,0fffffe00h
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add [eax+file_handler.position],edx
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add edi,edx
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.l2:
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and ecx,511
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jz .final
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call .bufer
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.final:
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popad
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ret
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.bufer:
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pushad
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mov ebx,[eax+file_handler.position]
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shr ebx,9
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cmp ebx,[eax+file_handler.bufer_block]
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je .l3
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mov [eax+file_handler.first_block],ebx
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mov [eax+file_handler.bufer_block],ebx
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mov dword[eax+file_handler.n_blocks],1
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lea ebx,[eax+file_handler.operation]
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mov eax,58
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int 40h
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cmp eax,0ffffff00h
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jnc .error
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.l3:
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mov eax,[esp+28]
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mov edx,[eax+file_handler.position]
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mov esi,[eax+file_handler.bufer]
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and edx,511
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add esi,edx
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neg edx
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add edx,512
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cmp ecx,edx
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jc .l4
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mov ecx,edx
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.l4:
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add [eax+file_handler.position],ecx
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sub [esp+24],ecx
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pop edi
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call movedata
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push edi
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popad
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ret
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.error:
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popad
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popad
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xor ecx,ecx
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stc
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ret
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ftell: mov edx,[eax+file_handler.position]
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ret
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lseek: ;eax=file edx=pos
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mov [eax+file_handler.position],edx
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ret
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skip: ;eax=file edx=bytes to skip
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add [eax+file_handler.position],edx
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ret
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