diff options
Diffstat (limited to 'docview/src/docdump/readheader.pas')
| -rw-r--r-- | docview/src/docdump/readheader.pas | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/docview/src/docdump/readheader.pas b/docview/src/docdump/readheader.pas new file mode 100644 index 00000000..201fcb86 --- /dev/null +++ b/docview/src/docdump/readheader.pas @@ -0,0 +1,135 @@ +{ + Dump the INF header & extended header structures to a text file +} +unit readheader; + +{$mode objfpc}{$H+} + +interface + +uses + Classes, SysUtils, filestreamhelper, IPFFileFormatUnit; + +procedure ProcessHeader(AIn: TFileStream; AOut: TFileTextStream); + +var + hdr: THelpFileHeader; + eHdr: TExtendedHelpFileHeader; + + +implementation + + +type + TWord = record + b1: AnsiChar; + b2: AnsiChar; + end; + + 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 + bytes: integer; + s: string; + w: TWord; + i: uint32; + t0: TOverlayID; + t1: TOverlaySearchStart; +begin + 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(' ipfheader.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(' ipfheader.flags: %8.2x (%s format) : File format' ,[hdr.flags, s])); + AOut.WriteLn(Format(' ipfheader.size: %8.4x (%0:7d bytes) : Size of this header structure', [hdr.hdrsize])); + AOut.WriteLn(Format(' ipfheader.version: %6d.%d : version of file format?', [hdr.version_hi, hdr.version_lo])); + AOut.WriteLn(Format(' ipfheader.ntoc: %8.4x (%0:13d) : No of TOC entries', [hdr.ntoc])); + AOut.WriteLn(Format(' ipfheader.tocstart: %8.8x (%0:7d bytes) : 32bit file offset to start of TOC', [hdr.tocstart])); + AOut.WriteLn(Format(' ipfheader.toclen: %8.8x (%0:7d bytes) : bytes occupied by TOC entries', [hdr.toclen])); + AOut.WriteLn(Format(' ipfheader.tocoffsetsstart: %8.8x (%0:7d bytes) : file offset to array of TOC offsets', [hdr.tocoffsetsstart])); + AOut.WriteLn(Format(' ipfheader.nres: %8.4x (%0:13d) : number of panels with resource numbers', [hdr.nres])); + AOut.WriteLn(Format(' ipfheader.resstart: %8.8x (%0:7d bytes) : 32bit file offset of ressource number table', [hdr.resstart])); + AOut.WriteLn(Format(' ipfheader.nname: %8.4x (%0:13d) : number of panels with textual name', [hdr.nname])); + AOut.WriteLn(Format(' ipfheader.namestart: %8.8x (%0:7d bytes) : 32bit file offset to panel name table', [hdr.namestart])); + AOut.WriteLn(Format(' ipfheader.nindex: %8.4x (%0:13d) : number of index entries', [hdr.nindex])); + AOut.WriteLn(Format(' ipfheader.indexstart: %8.8x (%0:7d bytes) : 32bit file offset to index table', [hdr.indexstart])); + AOut.WriteLn(Format(' ipfheader.indexlen: %8.8x (%0:7d bytes) : size of index table', [hdr.indexlen])); + AOut.WriteLn(Format(' ipfheader.icmdCount: %8.4x (%0:13d) : number of icmd index items', [hdr.icmdCount])); + AOut.WriteLn(Format(' ipfheader.icmdOffset: %8.8x (%0:7d bytes) : file offset to icmd index items', [hdr.icmdOffset])); + AOut.WriteLn(Format(' ipfheader.icmdSize: %8.8x (%0:7d bytes) : size of icmd index table', [hdr.icmdSize])); + t1 := TOverlaySearchStart(hdr.searchstart); + i := t1.SearchOffset; + AOut.WriteLn(Format(' ipfheader.searchstart :31 %8.8x (%0:7d bytes) : 31bit 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(' ipfheader.recSize :1 %s (%s) : if high bit set, search record size is 16bit', [BoolToStr(t1.IsRec16bitSize, True), s])); + AOut.WriteLn(Format(' ipfheader.searchlen: %8.8x (%0:7d bytes) : size of full text search table', [hdr.searchlen])); + AOut.WriteLn(Format(' ipfheader.nslots: %8.4x (%0:13d) : number of "slots"', [hdr.nslots])); + AOut.WriteLn(Format(' ipfheader.slotsstart: %8.8x (%0:7d bytes) : 32bit file offset of the slots array', [hdr.slotsstart])); + AOut.WriteLn(Format(' ipfheader.dictlen: %8.8x (%0:7d bytes) : bytes occupied by the "dictionary"', [hdr.dictlen])); + AOut.WriteLn(Format(' ipfheader.ndict: %8.4x (%0:13d) : number of entries in the dictionary', [hdr.ndict])); + AOut.WriteLn(Format(' ipfheader.dictstart: %8.8x (%0:7d bytes) : 32bit file offset to start of dictionary', [hdr.dictstart])); + AOut.WriteLn(Format(' ipfheader.imgstart: %8.8x (%0:7d bytes) : 32bit file offset to image data', [hdr.imgstart])); + AOut.WriteLn(Format(' ipfheader.maxCVTIndex: %8.2x (%0:13d) : highest index inside panel''s local dictionary', [hdr.maxCVTIndex])); + AOut.WriteLn(Format(' ipfheader.nlsstart: %8.8x (%0:7d bytes) : 32bit file offset of NLS table', [hdr.nlsstart, hdr.nlsstart])); + AOut.WriteLn(Format(' ipfheader.nlslen: %8.8x (%0:7d bytes) : size of NLS table', [hdr.nlslen])); + AOut.WriteLn(Format(' ipfheader.extstart: %8.8x (%0:7d bytes) : 32bit file offset of extended data block', [hdr.extstart])); + AOut.WriteLn(Format(' ipfheader.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(' ipfheader.title: "%s" : ASCII title of database', [hdr.title])); + + AOut.WriteLn(''); + AOut.WriteLn('Extended Header Section'); + AIn.Seek(hdr.extstart, soBeginning); + AIn.Read(eHdr, SizeOf(TExtendedHelpFileHeader)); + AOut.WriteLn(Format(' extheader.NumFontEntry %8.4x (%0:13d) : Font Table - number of entries', [eHdr.NumFontEntry])); + AOut.WriteLn(Format(' extheader.FontTableOffset %8.8x (%0:7d bytes) : Font Table - 32bit offset in file', [eHdr.FontTableOffset])); + AOut.WriteLn(Format(' extheader.NumDataBase %8.4x (%0:13d) : Data Base - No of files', [eHdr.NumDataBase])); + AOut.WriteLn(Format(' extheader.DataBaseOffset %8.8x (%0:7d bytes) : Data Base - 32bit offset in file', [eHdr.DataBaseOffset])); + AOut.WriteLn(Format(' extheader.DataBaseSize %8.8x (%0:7d bytes) : Data Base - Size in bytse', [eHdr.DataBaseSize])); + AOut.WriteLn(Format(' extheader.EntryInGNameTable %8.4x (%0:13d) : Global Names - No entries', [eHdr.EntryInGNameTable])); + AOut.WriteLn(Format(' extheader.HelpPanelGNameTblOffset %8.8x (%0:7d bytes) : Global Names - 32bit offset in file', [eHdr.HelpPanelGNameTblOffset])); + AOut.WriteLn(Format(' extheader.StringsOffset %8.8x (%0:7d bytes) : Strings - 32bit offset in file', [eHdr.StringsOffset])); + AOut.WriteLn(Format(' extheader.StringsSize %8.4x (%0:7d bytes) : Strings - Total bytes of all strings', [eHdr.StringsSize])); + AOut.WriteLn(Format(' extheader.ChildPagesOffset %8.8x (%0:7d bytes) : Child Pages - 32bit offset in file', [eHdr.ChildPagesOffset])); + AOut.WriteLn(Format(' extheader.ChildPagesSize %8.8x (%0:7d bytes) : Child Pages - Total bytes of all strings', [eHdr.ChildPagesSize])); + AOut.WriteLn(Format(' extheader.NumGIndexEntry %8.8x (%0:13d) : Total number of Global Index items', [eHdr.NumGIndexEntry])); + AOut.WriteLn(Format(' extheader.CtrlOffset %8.8x (%0:7d bytes) : Ctrl Buttons : offset in file', [eHdr.CtrlOffset])); + AOut.WriteLn(Format(' extheader.CtrlSize %8.8x (%0:7d bytes) : Ctrl Buttons : size in bytes', [eHdr.CtrlSize])); + AOut.WriteLn(Format(' extheader.reserved: %8.8x %8.8x %8.8x %8.8x : for future use. set to zero.', + [eHdr.reserved[0], eHdr.reserved[1], eHdr.reserved[2], eHdr.reserved[3]])); + + finally + // no nothing + end; +end; + +end. + |