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/** ** $Header: /sdsc/dev/vis/image/imtools/v3.0/libim/src/include/RCS/impref.h,v 1.4 1995/06/29 00:32:03 bduggan Exp $ ** Copyright (c) 1989-1995 San Diego Supercomputer Center (SDSC) ** a division of General Atomics, San Diego, California, USA ** ** Users and possessors of this source code are hereby granted a ** nonexclusive, royalty-free copyright and design patent license to ** use this code in individual software. License is not granted for ** commercial resale, in whole or in part, without prior written ** permission from SDSC. This source is provided "AS IS" without express ** or implied warranty of any kind. ** ** For further information contact: ** E-Mail: info@sds.sdsc.edu ** ** Surface Mail: Information Center ** San Diego Supercomputer Center ** P.O. Box 85608 ** San Diego, CA 92138-5608 ** (619) 534-5000 **/ /** ** FILE ** impref.h - Automatic format conversion preferences ** ** PROJECT ** libim - SDSC image manipulation library ** ** DESCRIPTION ** impref.h contains initializations for several tables that indicate ** what format conversions are prefered over what other conversions. ** These tables are used by ImFileWrite() to decide which of several ** possible file format variants to choose given a VFB. ** ** PUBLIC CONTENTS ** d =defined constant ** f =function ** m =defined macro ** t =typedef/struct/union ** v =variable ** ? =other ** ** __IMPREFH__ d file inclusion flag ** ** imFilePref t format preference table entry ** imFilePrefTable t format preference table ** ** imPrefMono v monochrome preference table ** imPrefIndex8 v 8-bit index preference table ** imPrefIndex16 v 16-bit index preference table ** imPrefRgb v RGB preference table ** ** PRIVATE CONTENTS ** none ** ** HISTORY ** $Log: impref.h,v $ ** Revision 1.4 1995/06/29 00:32:03 bduggan ** updated copyright ** ** Revision 1.3 1994/10/03 16:04:05 nadeau ** Updated to ANSI C and C++ compatibility. ** Updated copyright message. ** ** Revision 1.2 92/09/02 13:19:39 vle ** Updated copyright notice. ** ** Revision 1.1 91/10/03 12:57:51 nadeau ** Initial revision ** **/ #ifndef __IMPREFH__ #define __IMPREFH__ /* * TYPEDEF & STRUCT * imFilePref - format preference table entry * imFilePrefTable - format preference table * * GLOBALS * imPrefMono - monochrome preference table * imPrefIndex8 - 8-bit index preference table * imPrefIndex16 - 16-bit index preference table * imPrefRgb - RGB preference table * * DESCRIPTION * These tables are used by ImFileWrite to decide which of several * output variants supported by a file format is the best one to * choose given the attributes of an incomming VFB. * * Each table contains four sub-tables, one for each combination of * having a CLT and having alpha planes. Within each sub-table, * output format attributes (depth, CLT status, and alpha status) are * ordered from most preferable to least preferable. * * Preferences have determined by a human (ie., me) based upon the * following general guidelines: * * 1. Would rather promote to a "higher" image type than lose CLT. * 2. Would rather promote to a "higher" image type than lose Alpha. * 3. Would rather generate a bogus CLT than promote. * 4. If original is index8, promoting to index16 is better than RGB. * 5. All things being equal, promotion is in the path: * mono -> index8 -> rgb -> index16 * index16 is generally worse than rgb because of increased storage. * 6. Only demote to "lower" image type when all else fails. * 7. All things being equal, demotion is in the path: * rgb -> index16 -> index8 -> mono * 8. In a choice between loosing CLT or alpha, will lose alpha. * 9. Would rather lose CLT than demote. * 10. Would rather lose alpha than demote. * * When looking at a file format's supported depth variations (1-bit, * 8-bit, 16-bit, RGB, whatever), depths that fall between the cracks * of those represented in VFB's are treated as the next higher VFB * type in the order: * mono -> index8 -> index16 -> rgb * * EXAMPLE * A given format "Xyz" supports the following: * 1-bit mono, no CLT, no alpha * 8-bit index, no CLT, no alpha * 8-bit index, CLT, no alpha * 24-bit RGB, no CLT, no alpha * 24-bit RGB, no CLT, alpha * * We are given an 8-bit VFB, with CLT and no alpha planes. To a * human, a glance is enough to say "Yup, use the 3rd variant for Xyz". * To ImFileWrite the following is done: * * 1. Determine incomming VFB type. * 2. Get 'imIndex8' preferences table. * 3. Find 'Xyz' in format table. * 4. Get 'Xyz's write map. * 5. For each variant in the write map, look it up in the * 'imIndex8' preference table. Record the index of the * table entry that matches. * 6. Use the entry with the lowest index (ie, most prefered). */ typedef struct imFilePref { int pref_field; /* VFB field mask */ int pref_attributes; /* Attribute mask */ } imFilePref; typedef struct imFilePrefTable { imFilePref pref_noCltNoAlpha[16];/* No CLT, no Alpha plane */ imFilePref pref_cltNoAlpha[16]; /* Has CLT, no Alpha plane */ imFilePref pref_noCltAlpha[16]; /* No CLT, has Alpha plane */ imFilePref pref_cltAlpha[16]; /* Has CLT, has Alpha plane */ } imFilePrefTable; static imFilePrefTable imPrefMono = { /* Mono VFB, no CLT, no Alpha planes */ { { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, }, /* Mono VFB, CLT, no Alpha planes */ { { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, }, /* Mono VFB, no CLT, Alpha planes */ { { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, }, /* Mono VFB, CLT, Alpha planes */ { { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, }, }; static imFilePrefTable imPrefIndex8 = { /* Index8 VFB, no CLT, no Alpha planes */ { { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, }, /* Index8 VFB, CLT, no Alpha planes */ { { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, }, /* Index8 VFB, no CLT, Alpha planes */ { { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, }, /* Index8 VFB, CLT, Alpha planes */ { { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, }, }; static imFilePrefTable imPrefIndex16 = { /* Index16 VFB, no CLT, no Alpha planes */ { { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, }, /* Index16 VFB, CLT, no Alpha planes */ { { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, }, /* Index16 VFB, no CLT, Alpha planes */ { { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, }, /* Index16 VFB, CLT, Alpha planes */ { { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, }, }; static imFilePrefTable imPrefRgb = { /* Rgb VFB, no CLT, no Alpha planes */ { { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, }, /* Rgb VFB, CLT, no Alpha planes */ { { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, }, /* Rgb VFB, no CLT, Alpha planes */ { { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, }, /* Rgb VFB, CLT, Alpha planes */ { { IMVFBRGB, IMCLTYES | IMALPHAYES, }, { IMVFBRGB, IMCLTYES | IMALPHANO, }, { IMVFBRGB, IMCLTNO | IMALPHAYES, }, { IMVFBRGB, IMCLTNO | IMALPHANO, }, { IMVFBINDEX16, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX16, IMCLTYES | IMALPHANO, }, { IMVFBINDEX16, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX16, IMCLTNO | IMALPHANO, }, { IMVFBINDEX8, IMCLTYES | IMALPHAYES, }, { IMVFBINDEX8, IMCLTYES | IMALPHANO, }, { IMVFBINDEX8, IMCLTNO | IMALPHAYES, }, { IMVFBINDEX8, IMCLTNO | IMALPHANO, }, { IMVFBMONO, IMCLTYES | IMALPHAYES, }, { IMVFBMONO, IMCLTYES | IMALPHANO, }, { IMVFBMONO, IMCLTNO | IMALPHAYES, }, { IMVFBMONO, IMCLTNO | IMALPHANO, }, }, }; #endif /* __IMVFBREFH__ */
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