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RZX_BlockLists.asm
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RZX_BlockLists.asm
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.code
RZX_BuildBlockList proc uses ebx esi,
lpRZXStruct:DWORD
local textstring: TEXTSTRING,
pTEXTSTRING: DWORD
local tempinputblock: RZX_INPUT_RECORDING
mov esi, lpRZXStruct
assume esi: ptr TRZX
mov [esi].rzx_max_playback_frames, 0
.while TRUE
invoke ReadFile, [esi].RZX_FH, addr [esi].rzx_block_data, 5, addr BytesMoved, NULL
ifc BytesMoved eq 0 then return TRUE ; end of RZX file
ifc BytesMoved ne 5 then invoke Close_RZX, SADD ("Invalid RZX file"), FALSE : return FALSE ; invalid RZX file
switch [esi].rzx_block_data, ebx
case RZXBLK_SECURITYINFO, RZXBLK_SECURITYSIGNATURE
invoke Close_RZX, SADD ("Security blocks unsupported"), FALSE
return FALSE
case RZXBLK_SNAPSHOT, RZXBLK_INPUTRECORDING
; create a new node for this block at the start of the block data
invoke SetFilePointer, [esi].RZX_FH, -5, NULL, FILE_CURRENT
invoke RZX_Add_Block_Tail, lpRZXStruct, [esi].rzx_block_data
.if ebx == RZXBLK_INPUTRECORDING
invoke ReadFile, [esi].RZX_FH, addr tempinputblock, sizeof RZX_INPUT_RECORDING, addr BytesMoved, NULL
invoke SetFilePointer, [esi].RZX_FH, -sizeof RZX_INPUT_RECORDING, NULL, FILE_CURRENT
mov eax, tempinputblock.Frames_Count
add [esi].rzx_max_playback_frames, eax
.endif
; and skip forwards to the next block
invoke SetFilePointer, [esi].RZX_FH, [esi].rzx_block_data.RZX_CREATOR_INFO.Block_Length, NULL, FILE_CURRENT
.else
; skip unknown RZX block type
; debug build indicates unknown RZX block type ID
IFDEF DEBUGBUILD
invoke INITTEXTSTRING, addr textstring, addr pTEXTSTRING
ADDDIRECTTEXTSTRING pTEXTSTRING, "Unknown RZX block type: 0x"
ADDTEXTHEX pTEXTSTRING, ebx
invoke ShowMessageBox, hWnd, addr textstring, SADD ("RZX Info"), MB_OK or MB_ICONINFORMATION
ENDIF
; skip forwards to next RZX block
invoke SetFilePointer, [esi].RZX_FH, -5, NULL, FILE_CURRENT
invoke SetFilePointer, [esi].RZX_FH, [esi].rzx_block_data.RZX_CREATOR_INFO.Block_Length, NULL, FILE_CURRENT
; invoke Close_RZX, SADD ("Unknown RZX block type"), FALSE
; return FALSE
endsw
.endw
return TRUE ; all OK
assume esi: nothing
RZX_BuildBlockList endp
RZX_Add_Block_Tail proc uses esi,
lpRZXStruct:DWORD,
blocktype: BYTE
mov esi, AllocMem (sizeof RZX_Node)
ifc esi eq 0 then return FALSE
mov al, blocktype
mov [esi].RZX_Node.block_type, al
mov ecx, lpRZXStruct
invoke SetFilePointer, [ecx].TRZX.RZX_FH, 0, NULL, FILE_CURRENT
mov [esi].RZX_Node.file_pointer, eax
mov ecx, lpRZXStruct
lea ecx, [ecx].TRZX.BlockList
AddTail ecx, esi
ret
RZX_Add_Block_Tail endp
RZX_Free_List proc uses esi edi,
lpBlockList:DWORD
mov esi, lpBlockList
.while TRUE
.break .if $fnc (IsListEmpty, esi)
mov edi, [esi].ListHeader.lh_Head
invoke RemoveNode, edi
FreeMem edi
.endw
ret
RZX_Free_List endp
; loads a snapshot from the RZX snapshot block at the current file position
; the specified block ID must be a snapshot block else the RZX file is closed
; the file position is left immediately beyond the snapshot block
RZX_Load_Snapshot proc uses ebx esi edi,
lpRZXStruct:DWORD
local fhandle: HANDLE
local oldloadsnapfilename [MAX_PATH]: BYTE,
externalsnapfilename [MAX_PATH]: BYTE,
embeddedsnapfilename [MAX_PATH]: BYTE
local tRZX_block_data[5]: BYTE
mov eax, lpRZXStruct
mov eax, [eax].TRZX.RZX_FH
mov fhandle, eax
invoke ReadFile, fhandle, addr tRZX_block_data, 5, addr BytesMoved, NULL
ifc BytesMoved ne 5 then invoke Close_RZX, SADD ("Invalid RZX file"), FALSE : return FALSE ; invalid RZX file
mov ebx, tRZX_block_data.RZX_SNAPSHOT.Block_Length
mov edi, AllocMem (ebx)
ifc edi eq NULL then invoke Close_RZX, SADD ("Out of memory"), FALSE : return FALSE
invoke SetFilePointer, fhandle, -5, NULL, FILE_CURRENT
invoke ReadFile, fhandle, edi, ebx, addr BytesMoved, NULL
mov eax, [edi].RZX_SNAPSHOT.Flags
test eax, 1
.if !ZERO?
; external snapshot
lea ecx, [edi + sizeof (RZX_SNAPSHOT)] ; ecx = snapshot descriptor for external snapshot
add ecx, 4 ; ecx = snapshot filename
invoke @@CopyString, ecx, addr externalsnapfilename
invoke @@CopyString, addr loadsnapfilename, addr oldloadsnapfilename ; preserve last snapshot filename
mov inhibit_recent_file, TRUE
invoke LoadSnapshot_1, addr externalsnapfilename
mov inhibit_recent_file, FALSE
invoke @@CopyString, addr oldloadsnapfilename, addr loadsnapfilename ; restore last snapshot filename
.else
; embedded snapshot
invoke GetTempPath, MAX_PATH, addr embeddedsnapfilename
invoke szCatStr, addr embeddedsnapfilename, SADD ("tempsnapshot.")
lea ecx, [edi].RZX_SNAPSHOT.Extension
invoke szCatStr, addr embeddedsnapfilename, ecx
mov eax, [edi].RZX_SNAPSHOT.Flags
test eax, 2 ; compressed snapshot?
.if !ZERO?
mov esi, AllocMem ([edi].RZX_SNAPSHOT.Uncompressed_Length)
ifc esi eq NULL then FreeMem edi : invoke Close_RZX, SADD ("Out of memory"), FALSE : return FALSE
lea edx, [ebx-17] ; 17+SL DWORD Block length
lea ecx, [edi] + sizeof (RZX_SNAPSHOT)
invoke ZLIB_DecompressBlock, ecx, edx, esi, [edi].RZX_SNAPSHOT.Uncompressed_Length
ifc eax eq -1 then FreeMem esi : FreeMem edi : invoke Close_RZX, SADD ("Zlib decompression error"), FALSE : return FALSE
invoke WriteMemoryToFile, addr embeddedsnapfilename, esi, [edi].RZX_SNAPSHOT.Uncompressed_Length
FreeMem esi
.else
lea edx, [ebx-17] ; 17+SL DWORD Block length
lea ecx, [edi] + sizeof (RZX_SNAPSHOT)
invoke WriteMemoryToFile, addr embeddedsnapfilename, ecx, edx
.endif
invoke @@CopyString, addr loadsnapfilename, addr oldloadsnapfilename ; preserve last snapshot filename
mov inhibit_recent_file, TRUE
invoke LoadSnapshot_1, addr embeddedsnapfilename
mov inhibit_recent_file, FALSE
invoke @@CopyString, addr oldloadsnapfilename, addr loadsnapfilename ; restore last snapshot filename
invoke DeleteFile, addr embeddedsnapfilename ; delete the snapshot file after loading
.endif
FreeMem edi
ifc Snapshot_OK eq FALSE then return FALSE
return TRUE
RZX_Load_Snapshot endp