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fpspreadsheet: Support reading of BIFF2 files with BOF record of BIFF8 - there seem to exist some malformed files of this kind which can be read by Excel.

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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@8768 8e941d3f-bd1b-0410-a28a-d453659cc2b4
This commit is contained in:
wp_xxyyzz
2023-03-22 08:28:17 +00:00
parent 352fa06659
commit 9e861cf8d3
2 changed files with 9 additions and 4 deletions
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1
components/fpspreadsheet/examples/read_write/excel2demo/excel2write.lpi
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@ -53,6 +53,7 @@
<Filename Value="excel2write"/>
</Target>
<SearchPaths>
<IncludeFiles Value="..\..\..\source"/>
<OtherUnitFiles Value="..\..\..\source\common"/>
<UnitOutputDirectory Value="..\..\lib\$(TargetCPU)-$(TargetOS)"/>
</SearchPaths>

12
components/fpspreadsheet/source/common/xlsbiff2.pas
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@ -194,6 +194,7 @@ const
INT_EXCEL_ID_BOOLERROR = $0005;
INT_EXCEL_ID_ROW = $0008;
INT_EXCEL_ID_BOF = $0009;
INT_EXCEL_ID_BOF_BIFF8 = $0809;
{%H-}INT_EXCEL_ID_INDEX = $000B;
INT_EXCEL_ID_FORMAT = $001E;
INT_EXCEL_ID_FORMATCOUNT = $001F;
@ -340,6 +341,8 @@ class function TsSpreadBIFF2Reader.CheckFileFormat(AStream: TStream): Boolean;
const
BIFF2_HEADER: packed array[0..3] of byte = (
$09,$00, $04,$00); // they are common to all BIFF2 files that I've seen
BIFF8_BOF: packed array[0..1] of byte = (
$09,$08); // some files begin with the BOF of BIFF8 (don't know whether there are BIFF5 BOFs as well...)
var
P: Int64;
buf: packed array[0..3] of byte = (0, 0, 0, 0);
@ -352,10 +355,7 @@ begin
n := AStream.Read(buf, SizeOf(buf));
if n < Length(BIFF2_HEADER) then
exit;
for n:=0 to High(buf) do
if buf[n] <> BIFF2_HEADER[n] then
exit;
Result := true;
Result := CompareMem(@buf[0], @BIFF2_HEADER, 4) or CompareMem(@buf[0], @BIFF8_BOF, 2);
finally
AStream.Position := P;
end;
@ -656,6 +656,10 @@ begin
case RecordType of
INT_EXCEL_ID_BLANK : ReadBlank(AStream);
INT_EXCEL_ID_BOF : BOFFound := true;
INT_EXCEL_ID_BOF_BIFF8 : begin
BOFFound := true;
FWorkbook.AddErrorMsg('Incorrect file header.');
end;
INT_EXCEL_ID_BOOLERROR : ReadBool(AStream);
INT_EXCEL_ID_BOTTOMMARGIN : ReadMargin(AStream, 3);
INT_EXCEL_ID_CODEPAGE : ReadCodePage(AStream);