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+ added class for encoding/decoding an omf library end record

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git-svn-id: trunk@30660 -
This commit is contained in:
nickysn 2015-04-19 11:25:25 +00:00
parent e791f534d2
commit 623ea066c7
1 changed files with 43 additions and 0 deletions
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43
compiler/omfbase.pas
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@ -72,6 +72,7 @@ interface
RT_VERNUM = $CC; { OMF Version Number Record }
RT_VENDEXT = $CE; { Vendor-specific OMF Extension Record }
RT_LIBHEAD = $F0; { Library Header Record }
RT_LIBEND = $F1; { Library End Record (marks end of objects and beginning of dictionary) }
{ OMF comment class }
CC_Translator = $00; { language translator (compiler or assembler) name }
@ -486,6 +487,19 @@ interface
property CaseSensitive: Boolean read IsCaseSensitive write SetCaseSensitive;
end;
{ TOmfRecord_LIBEND }
TOmfRecord_LIBEND = class(TOmfParsedRecord)
private
FPaddingBytes: Word;
public
procedure DecodeFrom(RawRecord: TOmfRawRecord);override;
procedure EncodeTo(RawRecord: TOmfRawRecord);override;
procedure CalculatePaddingBytes(RecordStartOffset: DWord);
property PaddingBytes: Word read FPaddingBytes write FPaddingBytes;
end;
TOmfLibHash = record
block_x: Integer;
block_d: Integer;
@ -1494,6 +1508,35 @@ implementation
FFlags:=(FFlags and $FE) or Ord(AValue);
end;
{ TOmfRecord_LIBEND }
procedure TOmfRecord_LIBEND.DecodeFrom(RawRecord: TOmfRawRecord);
begin
if RawRecord.RecordType<>RT_LIBEND then
internalerror(2015040301);
FPaddingBytes:=RawRecord.RecordLength;
end;
procedure TOmfRecord_LIBEND.EncodeTo(RawRecord: TOmfRawRecord);
begin
{ make sure the LIBEND record is padded with zeros at the end }
FillChar(RawRecord.RawData,SizeOf(RawRecord.RawData),0);
RawRecord.RecordType:=RT_LIBEND;
RawRecord.RecordLength:=FPaddingBytes;
{ the LIBEND record contains no checksum byte, so no need to call
RawRecord.CalculateChecksumByte }
end;
procedure TOmfRecord_LIBEND.CalculatePaddingBytes(RecordStartOffset: DWord);
var
DictionaryStartOffset: Integer;
begin
{ padding must be calculated, so that the dictionary begins on a 512-byte boundary }
Inc(RecordStartOffset,3); // padding begins _after_ the record header (3 bytes)
DictionaryStartOffset:=(RecordStartOffset+511) and $fffffe00;
PaddingBytes:=DictionaryStartOffset-RecordStartOffset;
end;
function compute_omf_lib_hash(const name: string; blocks: Integer): TOmfLibHash;
const
blank=$20; // ASCII blank