127 lines
3.6 KiB
Plaintext
127 lines
3.6 KiB
Plaintext
unit imjinclude;
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{ This file exists to provide a single place to fix any problems with
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including the wrong system include files. (Common problems are taken
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care of by the standard jconfig symbols, but on really weird systems
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you may have to edit this file.)
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NOTE: this file is NOT intended to be included by applications using the
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JPEG library. Most applications need only include jpeglib.h. }
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{ Original: jinclude.h Copyright (C) 1991-1994, Thomas G. Lane. }
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interface
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{$I imjconfig.inc}
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{ Include auto-config file to find out which system include files we need. }
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uses
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{$ifdef Delphi_Stream}
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classes,
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{$endif}
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imjmorecfg;
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{ Nomssi:
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To write a dest/source manager that handle streams rather than files,
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you can edit the FILEptr definition and the JFREAD() and JFWRITE()
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functions in this unit, you don't need to change the default managers
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JDATASRC and JDATADST. }
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{$ifdef Delphi_Stream}
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type
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FILEptr = ^TStream;
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{$else}
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{$ifdef Delphi_Jpeg}
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type
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FILEptr = TCustomMemoryStream;
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{$else}
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type
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FILEptr = ^File;
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{$endif}
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{$endif}
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{ We need the NULL macro and size_t typedef.
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On an ANSI-conforming system it is sufficient to include <stddef.h>.
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Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
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pull in <sys/types.h> as well.
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Note that the core JPEG library does not require <stdio.h>;
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only the default error handler and data source/destination modules do.
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But we must pull it in because of the references to FILE in jpeglib.h.
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You can remove those references if you want to compile without <stdio.h>.}
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{ We need memory copying and zeroing functions, plus strncpy().
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ANSI and System V implementations declare these in <string.h>.
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BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
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Some systems may declare memset and memcpy in <memory.h>.
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NOTE: we assume the size parameters to these functions are of type size_t.
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Change the casts in these macros if not! }
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procedure MEMZERO(target : pointer; size : size_t);
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procedure MEMCOPY(dest, src : pointer; size : size_t);
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{function SIZEOF(object) : size_t;}
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function JFREAD(fp : FILEptr; buf : pointer; sizeofbuf : size_t) : size_t;
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function JFWRITE(fp : FILEptr; buf : pointer; sizeofbuf : size_t) : size_t;
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implementation
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procedure MEMZERO(target : pointer; size : size_t);
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begin
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FillChar(target^, size, 0);
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end;
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procedure MEMCOPY(dest, src : pointer; size : size_t);
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begin
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Move(src^, dest^, size);
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end;
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{ In ANSI C, and indeed any rational implementation, size_t is also the
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type returned by sizeof(). However, it seems there are some irrational
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implementations out there, in which sizeof() returns an int even though
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size_t is defined as long or unsigned long. To ensure consistent results
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we always use this SIZEOF() macro in place of using sizeof() directly. }
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{#define
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SIZEOF(object) (size_t(sizeof(object))}
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{ The modules that use fread() and fwrite() always invoke them through
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these macros. On some systems you may need to twiddle the argument casts.
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CAUTION: argument order is different from underlying functions! }
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function JFREAD(fp : FILEptr; buf : pointer; sizeofbuf : size_t) : size_t;
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var
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count : uint;
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begin
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{$ifdef Delphi_Stream}
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count := fp^.Read(buf^, sizeofbuf);
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{$else}
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blockread(fp^, buf^, sizeofbuf, count);
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{$endif}
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JFREAD := size_t(count);
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end;
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function JFWRITE(fp : FILEptr; buf : pointer; sizeofbuf : size_t) : size_t;
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var
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count : uint;
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begin
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{$ifdef Delphi_Stream}
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count := fp^.Write(buf^, sizeofbuf);
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{$else}
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blockwrite(fp^, buf^, sizeofbuf, count);
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{$endif}
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JFWRITE := size_t(count);
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end;
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end.
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