source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS_Configurator_v2/Src/BiosFile.asm

; Project name  :   XTIDE Univeral BIOS Configurator v2
; Description   :   Functions for loading and saving BIOS image file.

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
;
; 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.
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;

; Section containing code
SECTION .text

;--------------------------------------------------------------------
; BiosFile_LoadFileFromDSSItoRamBuffer
;   Parameters:
;       DS:SI:  Name of file to open
;       SS:BP:  Menu handle
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, BX, CX, DX, SI, DI
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
BiosFile_LoadFileFromDSSItoRamBuffer:
    mov     al, FILE_ACCESS.ReadOnly
    call    FileIO_OpenWithPathInDSSIandFileAccessInAL
    jc      SHORT .DisplayErrorMessage

    call    FileIO_GetFileSizeToDXAXusingHandleFromBXandResetFilePosition
    jc      SHORT .CloseUsingHandleFromBXandDisplayErrorMessage

    cmp     dx, MAX_EEPROM_SIZE_IN_BYTES >> 16
    jb      SHORT .FileNotTooBig
    ja      SHORT .FileTooBig
%if (MAX_EEPROM_SIZE_IN_BYTES & 0FFFFh) = 0
    test    ax, ax
    jnz     SHORT .FileTooBig
%else
    cmp     ax, MAX_EEPROM_SIZE_IN_BYTES & 0FFFFh
    ja      SHORT .FileTooBig
%endif
.FileNotTooBig:
    xchg    cx, ax

    call    .LoadFileWithNameInDSSIhandleInBXandSizeInDXCXtoRamBuffer
    jc      SHORT .CloseUsingHandleFromBXandDisplayErrorMessage

    mov     al, FLG_CFGVARS_FILELOADED
    call    Buffers_NewBiosWithSizeInDXCXandSourceInALhasBeenLoadedForConfiguration
    call    FileIO_CloseUsingHandleFromBX
    jmp     SHORT DisplayFileLoadedSuccessfully

.FileTooBig:
    call    DisplayFileTooBig
.CloseUsingHandleFromBXandDisplayErrorMessage:
    call    FileIO_CloseUsingHandleFromBX
.DisplayErrorMessage:
    jmp     SHORT DisplayFailedToLoadFile


;--------------------------------------------------------------------
; .LoadFileWithNameInDSSIhandleInBXandSizeInDXCXtoRamBuffer
;   Parameters:
;       BX:     File Handle
;       DX:CX:  File size
;       DS:SI:  File name
;   Returns:
;       CF:     Clear if successful
;               Set if error
;   Corrupts registers:
;       AX, SI, DI, DS
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
.LoadFileWithNameInDSSIhandleInBXandSizeInDXCXtoRamBuffer:
    push    es

    call    Buffers_GetFileBufferToESDI
    call    Registers_ExchangeDSSIwithESDI
    call    FileIO_ReadDXCXbytesToDSSIusingHandleFromBX
    jc      SHORT .ReturnError

    ; Store filename to Cfgvars from ESDI
    push    cx

    call    Registers_CopyESDItoDSSI                ; File name in DS:SI
    push    cs
    pop     es
    mov     di, g_cfgVars+CFGVARS.szOpenedFile
%ifdef CLD_NEEDED
    cld
%endif
    call    String_CopyDSSItoESDIandGetLengthToCX   ; Returns with CF cleared

    pop     cx
ALIGN JUMP_ALIGN
.ReturnError:
    pop     es
    ret


;--------------------------------------------------------------------
; BiosFile_SaveUnsavedChanges
;   Parameters:
;       SS:BP:  Menu handle
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, BX, CX, SI, DI
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
BiosFile_SaveUnsavedChanges:
    push    ds

    push    cs
    pop     ds
    mov     si, g_cfgVars+CFGVARS.szOpenedFile
    call    BiosFile_SaveRamBufferToFileInDSSI

    pop     ds
    ret


;--------------------------------------------------------------------
; BiosFile_SaveRamBufferToFileInDSSI
;   Parameters:
;       DS:SI:  Name of file to save
;       SS:BP:  Menu handle
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, BX, CX, SI, DI
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
BiosFile_SaveRamBufferToFileInDSSI:
    push    es

    call    Buffers_GenerateChecksum
    call    Buffers_GetFileBufferToESDI
    call    EEPROM_GetXtideUniversalBiosSizeFromESDItoDXCX

    mov     al, FILE_ACCESS.WriteOnly
    call    FileIO_OpenWithPathInDSSIandFileAccessInAL
    jc      SHORT .DisplayErrorMessage

    push    ds
    call    Registers_CopyESDItoDSSI
    call    FileIO_WriteDXCXbytesFromDSSIusingHandleFromBX
    pop     ds
    pushf
    call    FileIO_CloseUsingHandleFromBX
    popf
    jc      SHORT .DisplayErrorMessage

    call    Buffers_ClearUnsavedChanges
    pop     es
    jmp     SHORT DisplayFileSavedSuccessfully

.DisplayErrorMessage:
    pop     es
    jmp     SHORT DisplayFailedToSaveFile


;--------------------------------------------------------------------
; DisplayFileLoadedSuccessfully
; DisplayFileSavedSuccessfully
; DisplayFailedToLoadFile
; DisplayFailedToSaveFile
; DisplayFileTooBig
;   Parameters:
;       SS:BP:  Menu handle
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
DisplayFileLoadedSuccessfully:
    mov     dx, g_szDlgMainLoadFile
    jmp     Dialogs_DisplayNotificationFromCSDX

ALIGN JUMP_ALIGN
DisplayFileSavedSuccessfully:
    mov     dx, g_szDlgMainSaveFile
    jmp     Dialogs_DisplayNotificationFromCSDX

DisplayFailedToLoadFile:
    mov     dx, g_szDlgMainLoadErr
    jmp     Dialogs_DisplayErrorFromCSDX

DisplayFailedToSaveFile:
    mov     dx, g_szDlgMainSaveErr
    jmp     Dialogs_DisplayErrorFromCSDX

DisplayFileTooBig:
    mov     dx, g_szDlgMainFileTooBig
    jmp     Dialogs_DisplayErrorFromCSDX