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+/***************************************************************************/
+/*                                                                         */
+/*  ftvalid.h                                                              */
+/*                                                                         */
+/*    FreeType validation support (specification).                         */
+/*                                                                         */
+/*  Copyright 2004-2018 by                                                 */
+/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
+/*                                                                         */
+/*  This file is part of the FreeType project, and may only be used,       */
+/*  modified, and distributed under the terms of the FreeType project      */
+/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
+/*  this file you indicate that you have read the license and              */
+/*  understand and accept it fully.                                        */
+/*                                                                         */
+/***************************************************************************/
+
+
+#ifndef FTVALID_H_
+#define FTVALID_H_
+
+#include "ft2build.h"
+#include FT_CONFIG_STANDARD_LIBRARY_H   /* for ft_setjmp and ft_longjmp */
+
+
+FT_BEGIN_HEADER
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*************************************************************************/
+  /****                                                                 ****/
+  /****                                                                 ****/
+  /****                    V A L I D A T I O N                          ****/
+  /****                                                                 ****/
+  /****                                                                 ****/
+  /*************************************************************************/
+  /*************************************************************************/
+  /*************************************************************************/
+
+  /* handle to a validation object */
+  typedef struct FT_ValidatorRec_ volatile*  FT_Validator;
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* There are three distinct validation levels defined here:              */
+  /*                                                                       */
+  /* FT_VALIDATE_DEFAULT ::                                                */
+  /*   A table that passes this validation level can be used reliably by   */
+  /*   FreeType.  It generally means that all offsets have been checked to */
+  /*   prevent out-of-bound reads, that array counts are correct, etc.     */
+  /*                                                                       */
+  /* FT_VALIDATE_TIGHT ::                                                  */
+  /*   A table that passes this validation level can be used reliably and  */
+  /*   doesn't contain invalid data.  For example, a charmap table that    */
+  /*   returns invalid glyph indices will not pass, even though it can     */
+  /*   be used with FreeType in default mode (the library will simply      */
+  /*   return an error later when trying to load the glyph).               */
+  /*                                                                       */
+  /*   It also checks that fields which must be a multiple of 2, 4, or 8,  */
+  /*   don't have incorrect values, etc.                                   */
+  /*                                                                       */
+  /* FT_VALIDATE_PARANOID ::                                               */
+  /*   Only for font debugging.  Checks that a table follows the           */
+  /*   specification by 100%.  Very few fonts will be able to pass this    */
+  /*   level anyway but it can be useful for certain tools like font       */
+  /*   editors/converters.                                                 */
+  /*                                                                       */
+  typedef enum  FT_ValidationLevel_
+  {
+    FT_VALIDATE_DEFAULT = 0,
+    FT_VALIDATE_TIGHT,
+    FT_VALIDATE_PARANOID
+
+  } FT_ValidationLevel;
+
+
+#if defined( _MSC_VER )      /* Visual C++ (and Intel C++) */
+  /* We disable the warning `structure was padded due to   */
+  /* __declspec(align())' in order to compile cleanly with */
+  /* the maximum level of warnings.                        */
+#pragma warning( push )
+#pragma warning( disable : 4324 )
+#endif /* _MSC_VER */
+
+  /* validator structure */
+  typedef struct  FT_ValidatorRec_
+  {
+    ft_jmp_buf          jump_buffer; /* used for exception handling      */
+
+    const FT_Byte*      base;        /* address of table in memory       */
+    const FT_Byte*      limit;       /* `base' + sizeof(table) in memory */
+    FT_ValidationLevel  level;       /* validation level                 */
+    FT_Error            error;       /* error returned. 0 means success  */
+
+  } FT_ValidatorRec;
+
+#if defined( _MSC_VER )
+#pragma warning( pop )
+#endif
+
+#define FT_VALIDATOR( x )  ( (FT_Validator)( x ) )
+
+
+  FT_BASE( void )
+  ft_validator_init( FT_Validator        valid,
+                     const FT_Byte*      base,
+                     const FT_Byte*      limit,
+                     FT_ValidationLevel  level );
+
+  /* Sets the error field in a validator, then calls `longjmp' to return */
+  /* to high-level caller.  Using `setjmp/longjmp' avoids many stupid    */
+  /* error checks within the validation routines.                        */
+  /*                                                                     */
+  FT_BASE( void )
+  ft_validator_error( FT_Validator  valid,
+                      FT_Error      error );
+
+
+  /* Calls ft_validate_error.  Assumes that the `valid' local variable */
+  /* holds a pointer to the current validator object.                  */
+  /*                                                                   */
+#define FT_INVALID( _error )  FT_INVALID_( _error )
+#define FT_INVALID_( _error ) \
+          ft_validator_error( valid, FT_THROW( _error ) )
+
+  /* called when a broken table is detected */
+#define FT_INVALID_TOO_SHORT \
+          FT_INVALID( Invalid_Table )
+
+  /* called when an invalid offset is detected */
+#define FT_INVALID_OFFSET \
+          FT_INVALID( Invalid_Offset )
+
+  /* called when an invalid format/value is detected */
+#define FT_INVALID_FORMAT \
+          FT_INVALID( Invalid_Table )
+
+  /* called when an invalid glyph index is detected */
+#define FT_INVALID_GLYPH_ID \
+          FT_INVALID( Invalid_Glyph_Index )
+
+  /* called when an invalid field value is detected */
+#define FT_INVALID_DATA \
+          FT_INVALID( Invalid_Table )
+
+
+FT_END_HEADER
+
+#endif /* FTVALID_H_ */
+
+
+/* END */