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unit readheader;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, filestreamhelper;
procedure ProcessHeader(AIn: TFileStream; AOut: TFileTextStream);
implementation
uses
IPFFileFormatUnit;
type
TWord = record
b1: AnsiChar;
b2: AnsiChar;
end;
Unsigned_31 = 0 .. (1 shl 31) - 1; // 31 bit type
TOverlayID = packed record
b1: Byte;
b2: Byte;
b3: Byte;
end;
TOverlaySearchStart = bitpacked record
SearchOffset: Unsigned_31;
IsRec16bitSize: boolean;
end;
procedure ProcessHeader(AIn: TFileStream; AOut: TFileTextStream);
var
hdr: TPHelpFileHeader;
bytes: integer;
s: string;
w: TWord;
i: uint32;
t0: TOverlayID;
t1: TOverlaySearchStart;
begin
New(hdr);
try
AIn.Seek(0, soBeginning);
bytes := AIn.Read(hdr^, SizeOf(THelpFileHeader));
if bytes <> SizeOf(THelpFileHeader) then
raise Exception.Create('Failed to read complete file header');
if hdr^.ID <> INF_HEADER_ID then
raise Exception.Create('This is not an OS/2 help file');
AOut.WriteLn('Header Section');
t0 := TOverlayID(hdr^.ID);
s := hdr^.ID;
AOut.WriteLn(Format(' hdr.id: %4.2x %2x %2x ("%s") : Magic word' ,[Byte(hdr^.id[0]), Byte(hdr^.id[1]), Byte(hdr^.id[2]), s]));
if (hdr^.flags and $01) > 0 then
s := 'INF'
else
s := 'HLP';
AOut.WriteLn(Format(' hdr.flags: %8.2x (%s format) : File format' ,[hdr^.flags, s]));
AOut.WriteLn(Format(' hdr.size: %8.4x (%0:7d bytes) : Size of this header structure', [hdr^.hdrsize]));
AOut.WriteLn(Format(' hdr.version: %6d.%d : version of file format?', [hdr^.version_hi, hdr^.version_lo]));
AOut.WriteLn(Format(' hdr.ntoc: %8.4x (%0:13d) : No of TOC entries', [hdr^.ntoc]));
AOut.WriteLn(Format(' hdr.tocstart: %8.8x (%0:7d bytes) : 32bit file offset to start of TOC', [hdr^.tocstart]));
AOut.WriteLn(Format(' hdr.toclen: %8.8x (%0:7d bytes) : bytes occupied by TOC entries', [hdr^.toclen]));
AOut.WriteLn(Format(' hdr.tocoffsetsstart: %8.8x (%0:7d bytes) : file offset to array of TOC offsets', [hdr^.tocoffsetsstart]));
AOut.WriteLn(Format(' hdr.nres: %8.4x (%0:13d) : number of panels with resource numbers', [hdr^.nres]));
AOut.WriteLn(Format(' hdr.resstart: %8.8x (%0:7d bytes) : 32bit file offset of ressource number table', [hdr^.resstart]));
AOut.WriteLn(Format(' hdr.nname: %8.4x (%0:13d) : number of panels with textual name', [hdr^.nname]));
AOut.WriteLn(Format(' hdr.namestart: %8.8x (%0:7d bytes) : 32bit file offset to panel name table', [hdr^.namestart]));
AOut.WriteLn(Format(' hdr.nindex: %8.4x (%0:13d) : number of index entries', [hdr^.nindex]));
AOut.WriteLn(Format(' hdr.indexstart: %8.8x (%0:7d bytes) : 32bit file offset to index table', [hdr^.indexstart]));
AOut.WriteLn(Format(' hdr.indexlen: %8.8x (%0:7d bytes) : size of index table', [hdr^.indexlen]));
AOut.WriteLn(Format(' hdr.icmdCount: %8.4x (%0:13d) : number of icmd index items', [hdr^.icmdCount]));
AOut.WriteLn(Format(' hdr.icmdOffset: %8.8x (%0:7d bytes) : file offset to icmd index items', [hdr^.icmdOffset]));
AOut.WriteLn(Format(' hdr.icmdSize: %8.8x (%0:7d bytes) : size of icmd index table', [hdr^.icmdSize]));
t1 := TOverlaySearchStart(hdr^.searchstart);
i := t1.SearchOffset;
AOut.WriteLn(Format(' hdr.searchstart :31 %8.8x (%0:7d bytes) : 31 bit file offset of full text search table', [i, i]));
if t1.IsRec16bitSize then
s := 'search rec is 16bit size'
else
s := 'search rec is 8bit size';
AOut.WriteLn(Format(' hdr.recSize :1 %s (%s) : if high bit set, search record size is 16bit', [BoolToStr(t1.IsRec16bitSize, True), s]));
AOut.WriteLn(Format(' hdr.searchlen: %8.8x (%0:7d bytes) : size of full text search table', [hdr^.searchlen]));
AOut.WriteLn(Format(' hdr.nslots: %8.4x (%0:13d) : number of "slots"', [hdr^.nslots]));
AOut.WriteLn(Format(' hdr.slotsstart: %8.8x (%0:7d bytes) : 32bit file offset of the slots array', [hdr^.slotsstart]));
AOut.WriteLn(Format(' hdr.dictlen: %8.8x (%0:7d bytes) : bytes occupied by the "dictionary"', [hdr^.dictlen]));
AOut.WriteLn(Format(' hdr.ndict: %8.4x (%0:13d) : number of entries in the dictionary', [hdr^.ndict]));
AOut.WriteLn(Format(' hdr.dictstart: %8.8x (%0:7d bytes) : 32bit file offset to start of dictionary', [hdr^.dictstart]));
AOut.WriteLn(Format(' hdr.imgstart: %8.8x (%0:7d bytes) : 32bit file offset to image data', [hdr^.imgstart]));
AOut.WriteLn(Format(' hdr.maxCVTIndex: %8.2x (%0:13d) : highest index inside panel''s local dictionary', [hdr^.maxCVTIndex]));
AOut.WriteLn(Format(' hdr.nlsstart: %8.8x (%0:7d bytes) : 32bit file offset of NLS table', [hdr^.nlsstart, hdr^.nlsstart]));
AOut.WriteLn(Format(' hdr.nlslen: %8.8x (%0:7d bytes) : size of NLS table', [hdr^.nlslen]));
AOut.WriteLn(Format(' hdr.extstart: %8.8x (%0:7d bytes) : 32bit file offset of extended data block', [hdr^.extstart]));
AOut.WriteLn(Format(' hdr.reserved: %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x : for future use. set to zero.',
[hdr^.reserved[0], hdr^.reserved[1], hdr^.reserved[2], hdr^.reserved[3], hdr^.reserved[4], hdr^.reserved[5],
hdr^.reserved[6], hdr^.reserved[7], hdr^.reserved[8], hdr^.reserved[9], hdr^.reserved[10], hdr^.reserved[11] ]));
AOut.WriteLn(Format(' hdr.title: "%s" : ASCII title of database', [hdr^.title]));
{ title: array[ 0..47 ] of char; // ASCII title of database
}
finally
Dispose(hdr);
end;
end;
end.
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