kolibrios-gitea/programs/media/jpegview/trunk/filelib.asm

78 lines
1.2 KiB
NASM
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file_handler:
.operation=0
.position=4
.reserved=8
.n_bytes=12
.bufer=16
.name=20
.st_size=20+1024
open: ;esi=name_string
;retorna eax
pushad
mov ecx,file_handler.st_size
call mallocz
mov [esp+28],edi
push edi
mov ecx,1024
add edi,file_handler.name
call movedata
pop edi
; test if file exists
lea ebx,[edi+file_handler.operation]
mov byte[ebx],5
mov dword[ebx+16],fileattr
mov eax,70
int 0x40
cmp eax,2
jz .virtual
test eax,eax
jnz close.b
@@:
clc
popad
ret
.virtual:
mov byte [fileattr], 0x10
jmp @b
close:
pushad
.b:
mov edi,[esp+28]
call free
popad
xor eax,eax
ret
read: ;(f,bufer,nbytes) eax,edi,ecx ncr
;retorna bytes leidos en ecx
pushad
lea ebx, [eax+file_handler.operation]
mov byte [ebx], 0
mov [ebx+12], ecx
mov [ebx+16], edi
mov eax, 70
int 0x40
cmp ebx, -1
sbb ebx, -1
mov eax, [esp+28]
add [eax+file_handler.position], ebx
mov [esp+24], ebx
popad
ret
ftell: mov edx,[eax+file_handler.position]
ret
lseek: ;eax=file edx=pos
mov [eax+file_handler.position],edx
ret
skip: ;eax=file edx=bytes to skip
add [eax+file_handler.position],edx
ret