/*+
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 * jmorecfg.h+
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 *+
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 * Copyright (C) 1991-1997, Thomas G. Lane.+
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 * This file is part of the Independent JPEG Group's software.+
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 * For conditions of distribution and use, see the accompanying README file.+
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 *+
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 * This file contains additional configuration options that customize the+
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 * JPEG software for special applications or support machine-dependent+
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 * optimizations.  Most users will not need to touch this file.+
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 */+
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+
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+
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/*+
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 * Define BITS_IN_JSAMPLE as either+
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 *   8   for 8-bit sample values (the usual setting)+
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 *   12  for 12-bit sample values+
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 * Only 8 and 12 are legal data precisions for lossy JPEG according to the+
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 * JPEG standard, and the IJG code does not support anything else!+
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 * We do not support run-time selection of data precision, sorry.+
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 */+
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+
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#define BITS_IN_JSAMPLE  8	/* use 8 or 12 */+
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+
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+
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/*+
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 * Maximum number of components (color channels) allowed in JPEG image.+
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 * To meet the letter of the JPEG spec, set this to 255.  However, darn+
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 * few applications need more than 4 channels (maybe 5 for CMYK + alpha+
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 * mask).  We recommend 10 as a reasonable compromise; use 4 if you are+
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 * really short on memory.  (Each allowed component costs a hundred or so+
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 * bytes of storage, whether actually used in an image or not.)+
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 */+
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+
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#define MAX_COMPONENTS  10	/* maximum number of image components */+
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+
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+
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/*+
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 * Basic data types.+
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 * You may need to change these if you have a machine with unusual data+
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 * type sizes; for example, "char" not 8 bits, "short" not 16 bits,+
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 * or "long" not 32 bits.  We don't care whether "int" is 16 or 32 bits,+
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 * but it had better be at least 16.+
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 */+
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+
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/* Representation of a single sample (pixel element value).+
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 * We frequently allocate large arrays of these, so it's important to keep+
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 * them small.  But if you have memory to burn and access to char or short+
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 * arrays is very slow on your hardware, you might want to change these.+
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 */+
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+
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#if BITS_IN_JSAMPLE == 8+
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/* JSAMPLE should be the smallest type that will hold the values 0..255.+
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 * You can use a signed char by having GETJSAMPLE mask it with 0xFF.+
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 */+
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+
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#ifdef HAVE_UNSIGNED_CHAR+
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+
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typedef unsigned char JSAMPLE;+
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#define GETJSAMPLE(value)  ((int) (value))+
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+
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#else /* not HAVE_UNSIGNED_CHAR */+
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+
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typedef char JSAMPLE;+
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#ifdef CHAR_IS_UNSIGNED+
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#define GETJSAMPLE(value)  ((int) (value))+
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#else+
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#define GETJSAMPLE(value)  ((int) (value) & 0xFF)+
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#endif /* CHAR_IS_UNSIGNED */+
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+
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#endif /* HAVE_UNSIGNED_CHAR */+
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+
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#define MAXJSAMPLE	255+
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#define CENTERJSAMPLE	128+
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+
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#endif /* BITS_IN_JSAMPLE == 8 */+
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+
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+
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#if BITS_IN_JSAMPLE == 12+
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/* JSAMPLE should be the smallest type that will hold the values 0..4095.+
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 * On nearly all machines "short" will do nicely.+
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 */+
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+
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typedef short JSAMPLE;+
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#define GETJSAMPLE(value)  ((int) (value))+
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+
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#define MAXJSAMPLE	4095+
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#define CENTERJSAMPLE	2048+
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+
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#endif /* BITS_IN_JSAMPLE == 12 */+
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+
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+
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/* Representation of a DCT frequency coefficient.+
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 * This should be a signed value of at least 16 bits; "short" is usually OK.+
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 * Again, we allocate large arrays of these, but you can change to int+
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 * if you have memory to burn and "short" is really slow.+
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 */+
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+
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typedef short JCOEF;+
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+
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+
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/* Compressed datastreams are represented as arrays of JOCTET.+
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 * These must be EXACTLY 8 bits wide, at least once they are written to+
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 * external storage.  Note that when using the stdio data source/destination+
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 * managers, this is also the data type passed to fread/fwrite.+
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 */+
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+
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#ifdef HAVE_UNSIGNED_CHAR+
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+
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typedef unsigned char JOCTET;+
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#define GETJOCTET(value)  (value)+
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+
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#else /* not HAVE_UNSIGNED_CHAR */+
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+
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typedef char JOCTET;+
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#ifdef CHAR_IS_UNSIGNED+
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#define GETJOCTET(value)  (value)+
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#else+
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#define GETJOCTET(value)  ((value) & 0xFF)+
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#endif /* CHAR_IS_UNSIGNED */+
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+
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#endif /* HAVE_UNSIGNED_CHAR */+
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+
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+
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/* These typedefs are used for various table entries and so forth.+
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 * They must be at least as wide as specified; but making them too big+
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 * won't cost a huge amount of memory, so we don't provide special+
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 * extraction code like we did for JSAMPLE.  (In other words, these+
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 * typedefs live at a different point on the speed/space tradeoff curve.)+
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 */+
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+
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/* UINT8 must hold at least the values 0..255. */+
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+
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#ifdef HAVE_UNSIGNED_CHAR+
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typedef unsigned char UINT8;+
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#else /* not HAVE_UNSIGNED_CHAR */+
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#ifdef CHAR_IS_UNSIGNED+
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typedef char UINT8;+
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#else /* not CHAR_IS_UNSIGNED */+
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typedef short UINT8;+
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#endif /* CHAR_IS_UNSIGNED */+
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#endif /* HAVE_UNSIGNED_CHAR */+
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+
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/* UINT16 must hold at least the values 0..65535. */+
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+
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#ifdef HAVE_UNSIGNED_SHORT+
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typedef unsigned short UINT16;+
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#else /* not HAVE_UNSIGNED_SHORT */+
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typedef unsigned int UINT16;+
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#endif /* HAVE_UNSIGNED_SHORT */+
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+
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/* INT16 must hold at least the values -32768..32767. */+
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+
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#ifndef XMD_H			/* X11/xmd.h correctly defines INT16 */+
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typedef short INT16;+
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#endif+
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+
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/* INT32 must hold at least signed 32-bit values. */+
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+
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#if !defined(XMD_H) && !defined(VXWORKS)			/* X11/xmd.h correctly defines INT32 */+
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typedef long INT32;+
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#endif+
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+
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/* Datatype used for image dimensions.  The JPEG standard only supports+
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 * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore+
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 * "unsigned int" is sufficient on all machines.  However, if you need to+
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 * handle larger images and you don't mind deviating from the spec, you+
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 * can change this datatype.+
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 */+
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+
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typedef unsigned int JDIMENSION;+
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+
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#define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows */+
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+
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+
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/* These macros are used in all function definitions and extern declarations.+
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 * You could modify them if you need to change function linkage conventions;+
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 * in particular, you'll need to do that to make the library a Windows DLL.+
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 * Another application is to make all functions global for use with debuggers+
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 * or code profilers that require it.+
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 */+
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+
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/* a function called through method pointers: */+
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#define METHODDEF(type)		static type+
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/* a function used only in its module: */+
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#if defined(VXWORKS) && defined(LOCAL)+
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# undef LOCAL+
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#endif+
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#define LOCAL(type)		static type+
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/* a function referenced thru EXTERNs: */+
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#define GLOBAL(type)		type+
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/* a reference to a GLOBAL function: */+
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#define EXTERN(type)		extern type+
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+
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+
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/* This macro is used to declare a "method", that is, a function pointer.+
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 * We want to supply prototype parameters if the compiler can cope.+
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 * Note that the arglist parameter must be parenthesized!+
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 * Again, you can customize this if you need special linkage keywords.+
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 */+
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+
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#ifdef HAVE_PROTOTYPES+
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#define JMETHOD(type,methodname,arglist)  type (*methodname) arglist+
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#else+
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#define JMETHOD(type,methodname,arglist)  type (*methodname) ()+
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#endif+
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+
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+
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/* Here is the pseudo-keyword for declaring pointers that must be "far"+
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 * on 80x86 machines.  Most of the specialized coding for 80x86 is handled+
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 * by just saying "FAR *" where such a pointer is needed.  In a few places+
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 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.+
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 */+
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+
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#ifdef NEED_FAR_POINTERS+
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#define FAR  far+
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#else+
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#define FAR+
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#endif+
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+
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+
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/*+
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 * On a few systems, type boolean and/or its values FALSE, TRUE may appear+
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 * in standard header files.  Or you may have conflicts with application-+
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 * specific header files that you want to include together with these files.+
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 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.+
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 */+
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+
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#ifndef HAVE_BOOLEAN+
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typedef int boolean;+
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#endif+
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#ifndef FALSE			/* in case these macros already exist */+
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#define FALSE	0		/* values of boolean */+
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#endif+
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#ifndef TRUE+
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#define TRUE	1+
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#endif+
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+
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+
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/*+
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 * The remaining options affect code selection within the JPEG library,+
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 * but they don't need to be visible to most applications using the library.+
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 * To minimize application namespace pollution, the symbols won't be+
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 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.+
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 */+
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+
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#ifdef JPEG_INTERNALS+
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#define JPEG_INTERNAL_OPTIONS+
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#endif+
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+
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#ifdef JPEG_INTERNAL_OPTIONS+
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+
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+
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/*+
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 * These defines indicate whether to include various optional functions.+
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 * Undefining some of these symbols will produce a smaller but less capable+
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 * library.  Note that you can leave certain source files out of the+
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 * compilation/linking process if you've #undef'd the corresponding symbols.+
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 * (You may HAVE to do that if your compiler doesn't like null source files.)+
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 */+
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+
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/* Arithmetic coding is unsupported for legal reasons.  Complaints to IBM. */+
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+
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/* Capability options common to encoder and decoder: */+
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+
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#define DCT_ISLOW_SUPPORTED	/* slow but accurate integer algorithm */+
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#define DCT_IFAST_SUPPORTED	/* faster, less accurate integer method */+
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#define DCT_FLOAT_SUPPORTED	/* floating-point: accurate, fast on fast HW */+
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+
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/* Encoder capability options: */+
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+
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#undef  C_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */+
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#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */+
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#define C_PROGRESSIVE_SUPPORTED	    /* Progressive JPEG? (Requires MULTISCAN)*/+
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#define ENTROPY_OPT_SUPPORTED	    /* Optimization of entropy coding parms? */+
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/* Note: if you selected 12-bit data precision, it is dangerous to turn off+
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 * ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only good for 8-bit+
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 * precision, so jchuff.c normally uses entropy optimization to compute+
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 * usable tables for higher precision.  If you don't want to do optimization,+
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 * you'll have to supply different default Huffman tables.+
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 * The exact same statements apply for progressive JPEG: the default tables+
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 * don't work for progressive mode.  (This may get fixed, however.)+
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 */+
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#define INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? */+
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+
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/* Decoder capability options: */+
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+
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#undef  D_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */+
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#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */+
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#define D_PROGRESSIVE_SUPPORTED	    /* Progressive JPEG? (Requires MULTISCAN)*/+
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#define SAVE_MARKERS_SUPPORTED	    /* jpeg_save_markers() needed? */+
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#define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */+
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#define IDCT_SCALING_SUPPORTED	    /* Output rescaling via IDCT? */+
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#undef  UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */+
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#define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */+
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#define QUANT_1PASS_SUPPORTED	    /* 1-pass color quantization? */+
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#define QUANT_2PASS_SUPPORTED	    /* 2-pass color quantization? */+
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+
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/* more capability options later, no doubt */+
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+
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+
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/*+
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 * Ordering of RGB data in scanlines passed to or from the application.+
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 * If your application wants to deal with data in the order B,G,R, just+
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 * change these macros.  You can also deal with formats such as R,G,B,X+
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 * (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing+
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 * the offsets will also change the order in which colormap data is organized.+
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 * RESTRICTIONS:+
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 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.+
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 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not+
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 *    useful if you are using JPEG color spaces other than YCbCr or grayscale.+
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 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE+
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 *    is not 3 (they don't understand about dummy color components!).  So you+
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 *    can't use color quantization if you change that value.+
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 */+
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+
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#define RGB_RED		0	/* Offset of Red in an RGB scanline element */+
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#define RGB_GREEN	1	/* Offset of Green */+
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#define RGB_BLUE	2	/* Offset of Blue */+
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#define RGB_PIXELSIZE	3	/* JSAMPLEs per RGB scanline element */+
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+
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+
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/* Definitions for speed-related optimizations. */+
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+
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+
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/* If your compiler supports inline functions, define INLINE+
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 * as the inline keyword; otherwise define it as empty.+
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 */+
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+
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#ifndef INLINE+
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#ifdef __GNUC__			/* for instance, GNU C knows about inline */+
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#define INLINE __inline__+
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#endif+
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#ifndef INLINE+
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#define INLINE			/* default is to define it as empty */+
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#endif+
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#endif+
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+
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+
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/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying+
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 * two 16-bit shorts is faster than multiplying two ints.  Define MULTIPLIER+
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 * as short on such a machine.  MULTIPLIER must be at least 16 bits wide.+
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 */+
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+
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#ifndef MULTIPLIER+
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#define MULTIPLIER  int		/* type for fastest integer multiply */+
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#endif+
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+
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+
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/* FAST_FLOAT should be either float or double, whichever is done faster+
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 * by your compiler.  (Note that this type is only used in the floating point+
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 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)+
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 * Typically, float is faster in ANSI C compilers, while double is faster in+
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 * pre-ANSI compilers (because they insist on converting to double anyway).+
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 * The code below therefore chooses float if we have ANSI-style prototypes.+
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 */+
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+
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#ifndef FAST_FLOAT+
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#ifdef HAVE_PROTOTYPES+
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#define FAST_FLOAT  float+
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#else+
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#define FAST_FLOAT  double+
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#endif+
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#endif+
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+
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#endif /* JPEG_INTERNAL_OPTIONS */+
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