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fpc #4

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85dd771
fpc
deep-soft Sep 4, 2025
4f8ce7d
uncompress realloc
deep-soft Sep 29, 2025
e1fdf0d
Merge branch 'main' into fpc
deep-soft Dec 2, 2025
166dc35
Update PdfPageCount.pas
deep-soft Dec 2, 2025
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54 changes: 48 additions & 6 deletions PdfPageCount.pas
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
*******************************************************************************)

////////////////////////////////////////////////////////////////////////////////
// Summary of steps taken to parse a PDF doc for its page count :- �
// Summary of steps taken to parse a PDF doc for its page count :-  
////////////////////////////////////////////////////////////////////////////////
//1. See if there's a 'Linearization dictionary' for easy parsing.
// Mostly there isn't so ...
Expand All @@ -31,14 +31,26 @@
interface

uses
Windows, SysUtils, Classes, AnsiStrings, ZLib, Md5;
{$IFNDEF LINUX}
Windows,
{$ENDIF}
SysUtils,
Classes,
{$IFNDEF FPC}
AnsiStrings,
ZLib,
{$ELSE}
PasZLib,
{$ENDIF}
MD5;

const
PDF_NO_ERROR = 0;
PDF_ERROR_UNDEFINED = -1;
PDF_ERROR_FILE_OPEN = -2;
PDF_ERROR_FILE_FORMAT = -3;
PDF_ERROR_ENCRYPTED_STRM = -4;
PDF_ERROR_NO_INDEX = -5;

(*******************************************************************************
* GetPageCount *
Expand All @@ -51,6 +63,9 @@ function GetPageCount(const filename: string): integer; overload;

implementation

const
MAX_buffer_Size = 64*1024*1024;

type

PPdfObj = ^TPdfObj;
Expand Down Expand Up @@ -116,8 +131,11 @@ TPdfPageCounter = class
// Miscellaneous functions
//------------------------------------------------------------------------------

procedure QuickSortList(SortList: TPointerList;
L, R: Integer; sortFunc: TSortFunc);
{$IFDEF FPC}
procedure QuickSortList(SortList: PPointerList; L, R: Integer; sortFunc: TSortFunc);
{$ELSE}
procedure QuickSortList(SortList: TPointerList; L, R: Integer; sortFunc: TSortFunc);
{$ENDIF}
var
I, J: Integer;
P, T: Pointer;
Expand Down Expand Up @@ -777,12 +795,18 @@ function TPdfPageCounter.DecompressObjIntoBuffer(objNum, genNum: integer): boole

try
//decompress the stream ...
{$IFDEF FPC}
bufferSize := MAX_buffer_Size;
ReallocMem(buffer, bufferSize);
uncompress(pointer(buffer), cardinal(bufferSize), PChar(p), cardinal(len));
{$ELSE}
//nb: I'm not sure in which Delphi version these functions were renamed.
{$IFDEF UNICODE}
zlib.ZDecompress(p, len, pointer(buffer), Integer(bufferSize));
{$ELSE}
zlib.DecompressBuf(p, len, len*3, pointer(buffer), Integer(bufferSize));
{$ENDIF}
{$ENDIF}
except
ErrorFlag := PDF_ERROR_ENCRYPTED_STRM;
DisposeBuffer;
Expand Down Expand Up @@ -811,7 +835,12 @@ function TPdfPageCounter.FindStartXRef: boolean;
'f': dec(p, 8); 'e': dec(p, 7); 'x': dec(p, 5);
'r': dec(p, 3); 'a': dec(p, 2); 't': dec(p, 1);
's':

{$IFDEF FPC}
if StrLComp(p, 'startxref', 9) = 0 then
{$ELSE}
if AnsiStrings.StrLComp(p, 'startxref', 9) = 0 then
{$ENDIF}
begin
result := true;
inc(p, 9);
Expand All @@ -833,7 +862,11 @@ function TPdfPageCounter.GetLinearizedPageNum(out pageNum: integer): boolean;
result := false;
pStop := p + 32;
while (p < pStop) and (p^ <> 'o') do inc(p);
{$IFDEF FPC}
if StrLComp( p, 'obj', 3) <> 0 then exit;
{$ELSE}
if AnsiStrings.StrLComp( p, 'obj', 3) <> 0 then exit;
{$ENDIF}
pStart := p;
if not FindStrInDict('/Linearized') then exit;
p := pStart;
Expand Down Expand Up @@ -902,6 +935,7 @@ function TPdfPageCounter.GetPageNumUsingCrossRefStream: integer;
//if the Index array is empty then use the default values ...
if length(indexArray) = 0 then
begin
Result := PDF_ERROR_NO_INDEX;
setLength(indexArray, 2);
indexArray[0] := 0;
indexArray[1] := bufferSize div (w1 + w2 + w3);
Expand Down Expand Up @@ -950,7 +984,8 @@ function TPdfPageCounter.GetPageNumUsingCrossRefStream: integer;

DisposeBuffer;

QuickSortList(PdfObjList.List, 0, PdfObjList.Count -1, ListSort);
if PdfObjList.Count > 1 then
QuickSortList(PdfObjList.List, 0, PdfObjList.Count -1, ListSort);
if not GotoObject(rootNum) then exit;
if not FindStrInDict('/Pages') then exit;
//get the Pages' object number, go to it and get the page count ...
Expand Down Expand Up @@ -1002,7 +1037,11 @@ function TPdfPageCounter.GetPdfPageCount(stream: TStream): integer;
(k >= ms.size) then exit;

p := PAnsiChar(ms.Memory) + k;
{$IFDEF FPC}
if StrLComp(p, 'xref', 4) <> 0 then
{$ELSE}
if AnsiStrings.StrLComp(p, 'xref', 4) <> 0 then
{$ENDIF}
begin
//'xref' table not found so assume the doc contains
//a cross-reference stream instead (ie PDF doc ver 1.5+)
Expand Down Expand Up @@ -1057,7 +1096,8 @@ function TPdfPageCounter.GetPdfPageCount(stream: TStream): integer;
//Make sure we've got Root's object number ...
if rootNum = $FFFFFFFF then exit;

QuickSortList(PdfObjList.List, 0, PdfObjList.Count -1, ListSort);
if PdfObjList.Count > 1 then
QuickSortList(PdfObjList.List, 0, PdfObjList.Count -1, ListSort);
if not GotoObject(rootNum) then exit;

if not FindStrInDict('/Pages') then exit;
Expand Down Expand Up @@ -1122,3 +1162,5 @@ function GetPageCount(const filename: string): integer;
//------------------------------------------------------------------------------

end.