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CRUNCH2.PAS
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Pascal/Delphi Source File
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1991-11-08
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4KB
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138 lines
PROGRAM Crunch2; { (c) 1991 John C. Leon last updated 11/4/91 }
{Handles ONLY standard, fixed length Btrieve files.}
{$IFDEF production} {$D-,R-,L-,S-} {$ENDIF}
USES
BTP;
CONST
NumInsertions = 5; {MaxInsBufLen = (2+(2*Number of Insertions) + }
MaxInsBufLen = 20462; { (MaxFixedRecLength*Number of Insertions) }
TYPE
TExtDBuffer = record
Count: word;
Repeater: array[1..MaxInsBufLen-2] of byte;
end;
PCopyFile = ^TCopyFile;
TCopyFile = object(BFixed)
ExtDBuffer: TExtDBuffer;
function BTExt(OpCode, Key: integer): integer;
end;
VAR
OrgName, CopyName : string[79];
OrgFile : PBFixed;
CopyFile : PCopyFile;
Counter, Counter1,
DBuffOfs,
RecordLength : integer;
LoRecordLength,
HiRecordLength : byte;
function TCopyFile.BTExt(OpCode, Key: integer): integer;
var
ExtBufLen: integer;
begin
ExtBufLen := 2 + (2 * ExtDBuffer.Count) + (Specs.RecLen * ExtDBuffer.Count);
BTExt := Btrv(OpCode, PosBlk, ExtDBuffer, ExtBufLen, KBuffer, Key);
end;
(* Begin MAIN program code *)
(* ------------------------------------------------------------------------ *)
BEGIN
write('Name of file to copy from: ');
readln(OrgName);
for Counter := 1 to length(OrgName) do
OrgName[Counter] := upcase(OrgName[Counter]);
write('Name of file to create and populate from file ''', OrgName,''': ');
readln(CopyName);
for Counter := 1 to length(CopyName) do
CopyName[Counter] := upcase(CopyName[Counter]);
{ Open original file in read only mode }
OrgFile := new(PBFixed, Init(OrgName, ReadOnly));
RecordLength := OrgFile^.Specs.RecLen;
LoRecordLength := lo(RecordLength);
HiRecordLength := hi(RecordLength);
if BStatus <> Zero then
writeln('Error opening ', OrgName)
else
begin {if original file exists and no error on open op}
if OrgFile^.NumRecs = 0 then {don't proceed if empty file}
begin
writeln('No records in ', OrgName, '. CRUNCH aborted.');
halt;
end;
if (OrgFile^.Specs.FileFlags and 1) = 1 then {don't do var length files}
begin
writeln(OrgName, ' is a variable length file. Can''t process.');
halt;
end;
BStatus := CloneFile(OrgName, CopyName);
if BStatus = Zero then
writeln(CopyName, ' created successfully.')
else
begin
writeln('Error creating ', CopyName, '. Status = ', BStatus, '.');
halt;
end;
{Open new copy of file in accelerated mode.}
CopyFile := new(PCopyFile, Init(CopyName, Accel));
Counter1 := Zero;
DBuffOfs := 1;
for Counter := 1 to OrgFile^.NumRecs do
begin
BStatus := OrgFile^.BT(BStepNext, Zero);
CopyFile^.ExtDBuffer.Repeater[DBuffOfs] := LoRecordLength;
inc(DBuffOfs);
CopyFile^.ExtDBuffer.Repeater[DBuffOfs] := HiRecordLength;
inc(DBuffOfs);
move(OrgFile^.DBuffer[1],
CopyFile^.ExtDBuffer.Repeater[DBuffOfs], RecordLength);
DBuffOfs := DBuffOfs + RecordLength;
if ((Counter MOD NumInsertions) = Zero) then
begin
CopyFile^.ExtDBuffer.Count := NumInsertions;
BStatus := CopyFile^.BTExt(BInsertExt, Zero);
DBuffOfs := 1;
Counter1 := Counter1 + NumInsertions;
writeln('Inserted total of ', Counter1, ' records');
end;
end; {for Counter := 1 to OrgFile^.NumRecs do}
if ((OrgFile^.NumRecs MOD NumInsertions) <> Zero) then
begin
CopyFile^.ExtDBuffer.Count := (OrgFile^.NumRecs MOD NumInsertions);
Counter1 := Counter1 + CopyFile^.ExtDBuffer.Count;
BStatus := CopyFile^.BTExt(BInsertExt, Zero);
writeln('Inserted total of ', Counter1, ' records');
writeln('DONE...');
end;
BStatus := OrgFile^.Close;
BStatus := CopyFile^.Close;
dispose(OrgFile, Done);
dispose(CopyFile, Done);
end; {if BStatus <> Zero}
END.