/library/Library/WP7/SQLiteDriver/sqlite/sqliteInt_h.cs

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#define SQLITE_MAX_EXPR_DEPTH

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;

using Bitmask = System.UInt64;
using i16 = System.Int16;
using i64 = System.Int64;
using sqlite3_int64 = System.Int64;

using u8 = System.Byte;
using u16 = System.UInt16;
using u32 = System.UInt32;
using u64 = System.UInt64;
using unsigned = System.UInt64;

using Pgno = System.UInt32;

#if !SQLITE_MAX_VARIABLE_NUMBER
using ynVar = System.Int16;
#else
using ynVar = System.Int32; 
#endif

namespace Community.CsharpSqlite
{
  using sqlite3_value = Sqlite3.Mem;

  public partial class Sqlite3
  {
    /*
    ** 2001 September 15
    **
    ** The author disclaims copyright to this source code.  In place of
    ** a legal notice, here is a blessing:
    **
    **    May you do good and not evil.
    **    May you find forgiveness for yourself and forgive others.
    **    May you share freely, never taking more than you give.
    **
    *************************************************************************
    ** Internal interface definitions for SQLite.
    **
    *************************************************************************
    **  Included in SQLite3 port to C#-SQLite;  2008 Noah B Hart
    **  C#-SQLite is an independent reimplementation of the SQLite software library
    **
    **  SQLITE_SOURCE_ID: 2011-01-28 17:03:50 ed759d5a9edb3bba5f48f243df47be29e3fe8cd7
    **
    *************************************************************************
    */
    //#if !_SQLITEINT_H_
    //#define _SQLITEINT_H_

    /*
    ** These #defines should enable >2GB file support on POSIX if the
    ** underlying operating system supports it.  If the OS lacks
    ** large file support, or if the OS is windows, these should be no-ops.
    **
    ** Ticket #2739:  The _LARGEFILE_SOURCE macro must appear before any
    ** system #includes.  Hence, this block of code must be the very first
    ** code in all source files.
    **
    ** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch
    ** on the compiler command line.  This is necessary if you are compiling
    ** on a recent machine (ex: Red Hat 7.2) but you want your code to work
    ** on an older machine (ex: Red Hat 6.0).  If you compile on Red Hat 7.2
    ** without this option, LFS is enable.  But LFS does not exist in the kernel
    ** in Red Hat 6.0, so the code won't work.  Hence, for maximum binary
    ** portability you should omit LFS.
    **
    ** Similar is true for Mac OS X.  LFS is only supported on Mac OS X 9 and later.
    */
    //#if !SQLITE_DISABLE_LFS
    //# define _LARGE_FILE       1
    //# ifndef _FILE_OFFSET_BITS
    //#   define _FILE_OFFSET_BITS 64
    //# endif
    //# define _LARGEFILE_SOURCE 1
    //#endif

    /*
    ** Include the configuration header output by 'configure' if we're using the
    ** autoconf-based build
    */
#if _HAVE_SQLITE_CONFIG_H
//#include "config.h"
#endif
    //#include "sqliteLimit.h"

    /* Disable nuisance warnings on Borland compilers */
    //#if (__BORLANDC__)
    //#pragma warn -rch /* unreachable code */
    //#pragma warn -ccc /* Condition is always true or false */
    //#pragma warn -aus /* Assigned value is never used */
    //#pragma warn -csu /* Comparing signed and unsigned */
    //#pragma warn -spa /* Suspicious pointer arithmetic */
    //#endif

    /* Needed for various definitions... */
    //#if !_GNU_SOURCE
    //#define _GNU_SOURCE
    //#endif
    /*
    ** Include standard header files as necessary
    */
#if HAVE_STDINT_H
//#include <stdint.h>
#endif
#if HAVE_INTTYPES_H
//#include <inttypes.h>
#endif

    /*
** The number of samples of an index that SQLite takes in order to 
** construct a histogram of the table content when running ANALYZE
** and with SQLITE_ENABLE_STAT2
*/
    //#define SQLITE_INDEX_SAMPLES 10
    public const int SQLITE_INDEX_SAMPLES = 10;

    /*
    ** The following macros are used to cast pointers to integers and
    ** integers to pointers.  The way you do this varies from one compiler
    ** to the next, so we have developed the following set of #if statements
    ** to generate appropriate macros for a wide range of compilers.
    **
    ** The correct "ANSI" way to do this is to use the intptr_t type. 
    ** Unfortunately, that typedef is not available on all compilers, or
    ** if it is available, it requires an #include of specific headers
    ** that vary from one machine to the next.
    **
    ** Ticket #3860:  The llvm-gcc-4.2 compiler from Apple chokes on
    ** the ((void*)&((char*)0)[X]) construct.  But MSVC chokes on ((void*)(X)).
    ** So we have to define the macros in different ways depending on the
    ** compiler.
    */
    //#if (__PTRDIFF_TYPE__)  /* This case should work for GCC */
    //# define SQLITE_INT_TO_PTR(X)  ((void*)(__PTRDIFF_TYPE__)(X))
    //# define SQLITE_PTR_TO_INT(X)  ((int)(__PTRDIFF_TYPE__)(X))
    //#elif !defined(__GNUC__)       /* Works for compilers other than LLVM */
    //# define SQLITE_INT_TO_PTR(X)  ((void*)&((char*)0)[X])
    //# define SQLITE_PTR_TO_INT(X)  ((int)(((char*)X)-(char*)0))
    //#elif defined(HAVE_STDINT_H)   /* Use this case if we have ANSI headers */
    //# define SQLITE_INT_TO_PTR(X)  ((void*)(intptr_t)(X))
    //# define SQLITE_PTR_TO_INT(X)  ((int)(intptr_t)(X))
    //#else                          /* Generates a warning - but it always works */
    //# define SQLITE_INT_TO_PTR(X)  ((void*)(X))
    //# define SQLITE_PTR_TO_INT(X)  ((int)(X))
    //#endif

    /*
    ** The SQLITE_THREADSAFE macro must be defined as 0, 1, or 2.
    ** 0 means mutexes are permanently disable and the library is never
    ** threadsafe.  1 means the library is serialized which is the highest
    ** level of threadsafety.  2 means the libary is multithreaded - multiple
    ** threads can use SQLite as long as no two threads try to use the same
    ** database connection at the same time.
    **
    ** Older versions of SQLite used an optional THREADSAFE macro.
    ** We support that for legacy.
    */

#if !SQLITE_THREADSAFE
    //# define SQLITE_THREADSAFE 2
    const int SQLITE_THREADSAFE = 2;
#else
    const int SQLITE_THREADSAFE = 2; /* IMP: R-07272-22309 */
#endif

    /*
** The SQLITE_DEFAULT_MEMSTATUS macro must be defined as either 0 or 1.
** It determines whether or not the features related to
** SQLITE_CONFIG_MEMSTATUS are available by default or not. This value can
** be overridden at runtime using the sqlite3_config() API.
*/
#if !(SQLITE_DEFAULT_MEMSTATUS)
    //# define SQLITE_DEFAULT_MEMSTATUS 1
    const int SQLITE_DEFAULT_MEMSTATUS = 0;
#else
const int SQLITE_DEFAULT_MEMSTATUS = 1;
#endif

    /*
** Exactly one of the following macros must be defined in order to
** specify which memory allocation subsystem to use.
**
**     SQLITE_SYSTEM_MALLOC          // Use normal system malloc()
**     SQLITE_MEMDEBUG               // Debugging version of system malloc()
**
** (Historical note:  There used to be several other options, but we've
** pared it down to just these two.)
**
** If none of the above are defined, then set SQLITE_SYSTEM_MALLOC as
** the default.
*/
    //#if (SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)+\
    //# error "At most one of the following compile-time configuration options\
    // is allows: SQLITE_SYSTEM_MALLOC, SQLITE_MEMDEBUG"
    //#endif
    //#if (SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)+\
    //# define SQLITE_SYSTEM_MALLOC 1
    //#endif

    /*
    ** If SQLITE_MALLOC_SOFT_LIMIT is not zero, then try to keep the
    ** sizes of memory allocations below this value where possible.
    */
#if !(SQLITE_MALLOC_SOFT_LIMIT)
    const int SQLITE_MALLOC_SOFT_LIMIT = 1024;
#endif

    /*
** We need to define _XOPEN_SOURCE as follows in order to enable
** recursive mutexes on most Unix systems.  But Mac OS X is different.
** The _XOPEN_SOURCE define causes problems for Mac OS X we are told,
** so it is omitted there.  See ticket #2673.
**
** Later we learn that _XOPEN_SOURCE is poorly or incorrectly
** implemented on some systems.  So we avoid defining it at all
** if it is already defined or if it is unneeded because we are
** not doing a threadsafe build.  Ticket #2681.
**
** See also ticket #2741.
*/
#if !_XOPEN_SOURCE && !__DARWIN__ && !__APPLE__ && SQLITE_THREADSAFE
    const int _XOPEN_SOURCE = 500;//#define _XOPEN_SOURCE 500  /* Needed to enable pthread recursive mutexes */
#endif

    /*
** The TCL headers are only needed when compiling the TCL bindings.
*/
#if SQLITE_TCL || TCLSH
    //# include <tcl.h>
#endif

    /*
** Many people are failing to set -DNDEBUG=1 when compiling SQLite.
** Setting NDEBUG makes the code smaller and run faster.  So the following
** lines are added to automatically set NDEBUG unless the -DSQLITE_DEBUG=1
** option is set.  Thus NDEBUG becomes an opt-in rather than an opt-out
** feature.
*/
#if !NDEBUG && !SQLITE_DEBUG
const int NDEBUG = 1;//# define NDEBUG 1
#endif

    /*
** The testcase() macro is used to aid in coverage testing.  When
** doing coverage testing, the condition inside the argument to
** testcase() must be evaluated both true and false in order to
** get full branch coverage.  The testcase() macro is inserted
** to help ensure adequate test coverage in places where simple
** condition/decision coverage is inadequate.  For example, testcase()
** can be used to make sure boundary values are tested.  For
** bitmask tests, testcase() can be used to make sure each bit
** is significant and used at least once.  On switch statements
** where multiple cases go to the same block of code, testcase()
** can insure that all cases are evaluated.
**
*/
#if SQLITE_COVERAGE_TEST
void sqlite3Coverage(int);
//# define testcase(X)  if( X ){ sqlite3Coverage(__LINE__); }
#else
    //# define testcase(X)
    static void testcase<T>( T X )
    {
    }
#endif

    /*
** The TESTONLY macro is used to enclose variable declarations or
** other bits of code that are needed to support the arguments
** within testcase() and assert() macros.
*/
#if !NDEBUG || SQLITE_COVERAGE_TEST
    //# define TESTONLY(X)  X
    // -- Need workaround for C#, since inline macros don't exist
#else
//# define TESTONLY(X)
#endif

    /*
** Sometimes we need a small amount of code such as a variable initialization
** to setup for a later assert() statement.  We do not want this code to
** appear when assert() is disabled.  The following macro is therefore
** used to contain that setup code.  The "VVA" acronym stands for
** "Verification, Validation, and Accreditation".  In other words, the
** code within VVA_ONLY() will only run during verification processes.
*/
#if !NDEBUG
    //# define VVA_ONLY(X)  X
#else
//# define VVA_ONLY(X)
#endif

    /*
** The ALWAYS and NEVER macros surround boolean expressions which
** are intended to always be true or false, respectively.  Such
** expressions could be omitted from the code completely.  But they
** are included in a few cases in order to enhance the resilience
** of SQLite to unexpected behavior - to make the code "self-healing"
** or "ductile" rather than being "brittle" and crashing at the first
** hint of unplanned behavior.
**
** In other words, ALWAYS and NEVER are added for defensive code.
**
** When doing coverage testing ALWAYS and NEVER are hard-coded to
** be true and false so that the unreachable code then specify will
** not be counted as untested code.
*/
#if SQLITE_COVERAGE_TEST
//# define ALWAYS(X)      (1)
//# define NEVER(X)       (0)
#elif !NDEBUG
    //# define ALWAYS(X)      ((X)?1:(assert(0),0))
    static bool ALWAYS( bool X )
    {
      if ( X != true )
        Debug.Assert( false );
      return true;
    }
    static int ALWAYS( int X )
    {
      if ( X == 0 )
        Debug.Assert( false );
      return 1;
    }
    static bool ALWAYS<T>( T X )
    {
      if ( X == null )
        Debug.Assert( false );
      return true;
    }

    //# define NEVER(X)       ((X)?(assert(0),1):0)
    static bool NEVER( bool X )
    {
      if ( X == true )
        Debug.Assert( false );
      return false;
    }
    static byte NEVER( byte X )
    {
      if ( X != 0 )
        Debug.Assert( false );
      return 0;
    }
    static int NEVER( int X )
    {
      if ( X != 0 )
        Debug.Assert( false );
      return 0;
    }
    static bool NEVER<T>( T X )
    {
      if ( X != null )
        Debug.Assert( false );
      return false;
    }
#else
//# define ALWAYS(X)      (X)
static bool ALWAYS(bool X) { return X; }
static byte ALWAYS(byte X) { return X; }
static int ALWAYS(int X) { return X; }
static bool ALWAYS<T>( T X ) { return true; }

//# define NEVER(X)       (X)
static bool NEVER(bool X) { return X; }
static byte NEVER(byte X) { return X; }
static int NEVER(int X) { return X; }
static bool NEVER<T>(T X) { return false; }
#endif

    /*
** Return true (non-zero) if the input is a integer that is too large
** to fit in 32-bits.  This macro is used inside of various testcase()
** macros to verify that we have tested SQLite for large-file support.
*/
    static bool IS_BIG_INT( i64 X )
    {
      return ( ( ( X ) & ~(i64)0xffffffff ) != 0 );
    }//#define IS_BIG_INT(X)  (((X)&~(i64)0xffffffff)!=0)

    /*
    ** The macro unlikely() is a hint that surrounds a boolean
    ** expression that is usually false.  Macro likely() surrounds
    ** a boolean expression that is usually true.  GCC is able to
    ** use these hints to generate better code, sometimes.
    */
#if (__GNUC__) && FALSE
//# define likely(X)    __builtin_expect((X),1)
//# define unlikely(X)  __builtin_expect((X),0)
#else
    //# define likely(X)    !!(X)
    static bool likely( bool X )
    {
      return !!X;
    }
    //# define unlikely(X)  !!(X)
    static bool unlikely( bool X )
    {
      return !!X;
    }
#endif

    //#include "sqlite3.h"
    //#include "hash.h"
    //#include "parse.h"
    //#include <stdio.h>
    //#include <stdlib.h>
    //#include <string.h>
    //#include <assert.h>
    //#include <stddef.h>

    /*
    ** If compiling for a processor that lacks floating point support,
    ** substitute integer for floating-point
    */
#if SQLITE_OMIT_FLOATING_POINT
//# define double sqlite_int64
//# define float sqlite_int64
//# define LONGDOUBLE_TYPE sqlite_int64
//#if !SQLITE_BIG_DBL
//#   define SQLITE_BIG_DBL (((sqlite3_int64)1)<<50)
//# endif
//# define SQLITE_OMIT_DATETIME_FUNCS 1
//# define SQLITE_OMIT_TRACE 1
//# undef SQLITE_MIXED_ENDIAN_64BIT_FLOAT
//# undef SQLITE_HAVE_ISNAN
#endif
#if !SQLITE_BIG_DBL
    const double SQLITE_BIG_DBL = ( ( (sqlite3_int64)1 ) << 60 );//# define SQLITE_BIG_DBL (1e99)
#endif

    /*
** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0
** afterward. Having this macro allows us to cause the C compiler
** to omit code used by TEMP tables without messy #if !statements.
*/
#if SQLITE_OMIT_TEMPDB
//#define OMIT_TEMPDB 1
#else
    static int OMIT_TEMPDB = 0;
#endif


    /*
** The "file format" number is an integer that is incremented whenever
** the VDBE-level file format changes.  The following macros define the
** the default file format for new databases and the maximum file format
** that the library can read.
*/
    static public int SQLITE_MAX_FILE_FORMAT = 4;//#define SQLITE_MAX_FILE_FORMAT 4
    //#if !SQLITE_DEFAULT_FILE_FORMAT
    static int SQLITE_DEFAULT_FILE_FORMAT = 1;//# define SQLITE_DEFAULT_FILE_FORMAT 1
    //#endif

    /*
    ** Determine whether triggers are recursive by default.  This can be
    ** changed at run-time using a pragma.
    */
#if !SQLITE_DEFAULT_RECURSIVE_TRIGGERS
    //# define SQLITE_DEFAULT_RECURSIVE_TRIGGERS 0
    static public bool SQLITE_DEFAULT_RECURSIVE_TRIGGERS = false;
#else
static public bool SQLITE_DEFAULT_RECURSIVE_TRIGGERS = true;
#endif


    /*
** Provide a default value for SQLITE_TEMP_STORE in case it is not specified
** on the command-line
*/
//#if !SQLITE_TEMP_STORE
    static int SQLITE_TEMP_STORE = 1;//#define SQLITE_TEMP_STORE 1
//#endif

    /*
** GCC does not define the offsetof() macro so we'll have to do it
** ourselves.
*/
#if !offsetof
    //#define offsetof(STRUCTURE,FIELD) ((int)((char*)&((STRUCTURE*)0)->FIELD))
#endif

    /*
** Check to see if this machine uses EBCDIC.  (Yes, believe it or
** not, there are still machines out there that use EBCDIC.)
*/
#if FALSE //'A' == '\301'
//# define SQLITE_EBCDIC 1
#else
    const int SQLITE_ASCII = 1;//#define SQLITE_ASCII 1
#endif

    /*
** Integers of known sizes.  These typedefs might change for architectures
** where the sizes very.  Preprocessor macros are available so that the
** types can be conveniently redefined at compile-type.  Like this:
**
**         cc '-Du32PTR_TYPE=long long int' ...
*/
    //#if !u32_TYPE
    //# ifdef HAVE_u32_T
    //#  define u32_TYPE u32_t
    //# else
    //#  define u32_TYPE unsigned int
    //# endif
    //#endif
    //#if !u3216_TYPE
    //# ifdef HAVE_u3216_T
    //#  define u3216_TYPE u3216_t
    //# else
    //#  define u3216_TYPE unsigned short int
    //# endif
    //#endif
    //#if !INT16_TYPE
    //# ifdef HAVE_INT16_T
    //#  define INT16_TYPE int16_t
    //# else
    //#  define INT16_TYPE short int
    //# endif
    //#endif
    //#if !u328_TYPE
    //# ifdef HAVE_u328_T
    //#  define u328_TYPE u328_t
    //# else
    //#  define u328_TYPE unsigned char
    //# endif
    //#endif
    //#if !INT8_TYPE
    //# ifdef HAVE_INT8_T
    //#  define INT8_TYPE int8_t
    //# else
    //#  define INT8_TYPE signed char
    //# endif
    //#endif
    //#if !LONGDOUBLE_TYPE
    //# define LONGDOUBLE_TYPE long double
    //#endif
    //typedef sqlite_int64 i64;          /* 8-byte signed integer */
    //typedef sqlite_u3264 u64;         /* 8-byte unsigned integer */
    //typedef u32_TYPE u32;           /* 4-byte unsigned integer */
    //typedef u3216_TYPE u16;           /* 2-byte unsigned integer */
    //typedef INT16_TYPE i16;            /* 2-byte signed integer */
    //typedef u328_TYPE u8;             /* 1-byte unsigned integer */
    //typedef INT8_TYPE i8;              /* 1-byte signed integer */

    /*
    ** SQLITE_MAX_U32 is a u64 constant that is the maximum u64 value
    ** that can be stored in a u32 without loss of data.  The value
    ** is 0x00000000ffffffff.  But because of quirks of some compilers, we
    ** have to specify the value in the less intuitive manner shown:
    */
    //#define SQLITE_MAX_U32  ((((u64)1)<<32)-1)
    const u32 SQLITE_MAX_U32 = (u32)( ( ( (u64)1 ) << 32 ) - 1 );


    /*
    ** Macros to determine whether the machine is big or little endian,
    ** evaluated at runtime.
    */
#if SQLITE_AMALGAMATION
//const int sqlite3one = 1;
#else
    const bool sqlite3one = true;
#endif
#if i386 || __i386__ || _M_IX86
const int ;//#define SQLITE_BIGENDIAN    0
const int ;//#define SQLITE_LITTLEENDIAN 1
const int ;//#define SQLITE_UTF16NATIVE  SQLITE_UTF16LE
#else
    static u8 SQLITE_BIGENDIAN = 0;//#define SQLITE_BIGENDIAN    (*(char *)(&sqlite3one)==0)
    static u8 SQLITE_LITTLEENDIAN = 1;//#define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1)
    static u8 SQLITE_UTF16NATIVE = ( SQLITE_BIGENDIAN != 0 ? SQLITE_UTF16BE : SQLITE_UTF16LE );//#define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE)
#endif

    /*
** Constants for the largest and smallest possible 64-bit signed integers.
** These macros are designed to work correctly on both 32-bit and 64-bit
** compilers.
*/
    //#define LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
    //#define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
    const i64 LARGEST_INT64 = i64.MaxValue;//( 0xffffffff | ( ( (i64)0x7fffffff ) << 32 ) );
    const i64 SMALLEST_INT64 = i64.MinValue;//( ( ( i64 ) - 1 ) - LARGEST_INT64 );

    /*
    ** Round up a number to the next larger multiple of 8.  This is used
    ** to force 8-byte alignment on 64-bit architectures.
    */
    //#define ROUND8(x)     (((x)+7)&~7)
    static int ROUND8( int x )
    {
      return ( x + 7 ) & ~7;
    }

    /*
    ** Round down to the nearest multiple of 8
    */
    //#define ROUNDDOWN8(x) ((x)&~7)
    static int ROUNDDOWN8( int x )
    {
      return x & ~7;
    }

    /*
    ** Assert that the pointer X is aligned to an 8-byte boundary.  This
    ** macro is used only within assert() to verify that the code gets
    ** all alignment restrictions correct.
    **
    ** Except, if SQLITE_4_BYTE_ALIGNED_MALLOC is defined, then the
    ** underlying malloc() implemention might return us 4-byte aligned
    ** pointers.  In that case, only verify 4-byte alignment.
    */
    //#ifdef SQLITE_4_BYTE_ALIGNED_MALLOC
    //# define EIGHT_BYTE_ALIGNMENT(X)   ((((char*)(X) - (char*)0)&3)==0)
    //#else
    //# define EIGHT_BYTE_ALIGNMENT(X)   ((((char*)(X) - (char*)0)&7)==0)
    //#endif

    /*
    ** An instance of the following structure is used to store the busy-handler
    ** callback for a given sqlite handle.
    **
    ** The sqlite.busyHandler member of the sqlite struct contains the busy
    ** callback for the database handle. Each pager opened via the sqlite
    ** handle is passed a pointer to sqlite.busyHandler. The busy-handler
    ** callback is currently invoked only from within pager.c.
    */
    //typedef struct BusyHandler BusyHandler;
    public class BusyHandler
    {
      public dxBusy xFunc;//)(void *,int);  /* The busy callback */
      public object pArg;                   /* First arg to busy callback */
      public int nBusy;                     /* Incremented with each busy call */
    };

    /*
    ** Name of the master database table.  The master database table
    ** is a special table that holds the names and attributes of all
    ** user tables and indices.
    */
    const string MASTER_NAME = "sqlite_master";//#define MASTER_NAME       "sqlite_master"
    const string TEMP_MASTER_NAME = "sqlite_temp_master";//#define TEMP_MASTER_NAME  "sqlite_temp_master"

    /*
    ** The root-page of the master database table.
    */
    const int MASTER_ROOT = 1;//#define MASTER_ROOT       1

    /*
    ** The name of the schema table.
    */
    static string SCHEMA_TABLE( int x ) //#define SCHEMA_TABLE(x)  ((!OMIT_TEMPDB)&&(x==1)?TEMP_MASTER_NAME:MASTER_NAME)
    {
      return ( ( OMIT_TEMPDB == 0 ) && ( x == 1 ) ? TEMP_MASTER_NAME : MASTER_NAME );
    }

    /*
    ** A convenience macro that returns the number of elements in
    ** an array.
    */
    //#define ArraySize(X)    ((int)(sizeof(X)/sizeof(X[0])))
    static int ArraySize<T>( T[] x )
    {
      return x.Length;
    }

    /*
    ** The following value as a destructor means to use sqlite3DbFree().
    ** This is an internal extension to SQLITE_STATIC and SQLITE_TRANSIENT.
    */
    //#define SQLITE_DYNAMIC   ((sqlite3_destructor_type)sqlite3DbFree)
    static dxDel SQLITE_DYNAMIC;

    /*
    ** When SQLITE_OMIT_WSD is defined, it means that the target platform does
    ** not support Writable Static Data (WSD) such as global and static variables.
    ** All variables must either be on the stack or dynamically allocated from
    ** the heap.  When WSD is unsupported, the variable declarations scattered
    ** throughout the SQLite code must become constants instead.  The SQLITE_WSD
    ** macro is used for this purpose.  And instead of referencing the variable
    ** directly, we use its constant as a key to lookup the run-time allocated
    ** buffer that holds real variable.  The constant is also the initializer
    ** for the run-time allocated buffer.
    **
    ** In the usual case where WSD is supported, the SQLITE_WSD and GLOBAL
    ** macros become no-ops and have zero performance impact.
    */
#if SQLITE_OMIT_WSD
//#define SQLITE_WSD const
//#define GLOBAL(t,v) (*(t*)sqlite3_wsd_find((void*)&(v), sizeof(v)))
//#define sqlite3GlobalConfig GLOBAL(struct Sqlite3Config, sqlite3Config)
int sqlite3_wsd_init(int N, int J);
void *sqlite3_wsd_find(void *K, int L);
#else
    //#define SQLITE_WSD
    //#define GLOBAL(t,v) v
    //#define sqlite3GlobalConfig sqlite3Config
    static Sqlite3Config sqlite3GlobalConfig;
#endif

    /*
** The following macros are used to suppress compiler warnings and to
** make it clear to human readers when a function parameter is deliberately
** left unused within the body of a function. This usually happens when
** a function is called via a function pointer. For example the
** implementation of an SQL aggregate step callback may not use the
** parameter indicating the number of arguments passed to the aggregate,
** if it knows that this is enforced elsewhere.
**
** When a function parameter is not used at all within the body of a function,
** it is generally named "NotUsed" or "NotUsed2" to make things even clearer.
** However, these macros may also be used to suppress warnings related to
** parameters that may or may not be used depending on compilation options.
** For example those parameters only used in assert() statements. In these
** cases the parameters are named as per the usual conventions.
*/
    //#define UNUSED_PARAMETER(x) (void)(x)
    static void UNUSED_PARAMETER<T>( T x )
    {
    }

    //#define UNUSED_PARAMETER2(x,y) UNUSED_PARAMETER(x),UNUSED_PARAMETER(y)
    static void UNUSED_PARAMETER2<T1, T2>( T1 x, T2 y )
    {
      UNUSED_PARAMETER( x );
      UNUSED_PARAMETER( y );
    }

    /*
    ** Forward references to structures
    */
    //typedef struct AggInfo AggInfo;
    //typedef struct AuthContext AuthContext;
    //typedef struct AutoincInfo AutoincInfo;
    //typedef struct Bitvec Bitvec;
    //typedef struct CollSeq CollSeq;
    //typedef struct Column Column;
    //typedef struct Db Db;
    //typedef struct Schema Schema;
    //typedef struct Expr Expr;
    //typedef struct ExprList ExprList;
    //typedef struct ExprSpan ExprSpan;
    //typedef struct FKey FKey;
    //typedef struct FuncDestructor FuncDestructor;
    //typedef struct FuncDef FuncDef;
    //typedef struct IdList IdList;
    //typedef struct Index Index;
    //typedef struct IndexSample IndexSample;
    //typedef struct KeyClass KeyClass;
    //typedef struct KeyInfo KeyInfo;
    //typedef struct Lookaside Lookaside;
    //typedef struct LookasideSlot LookasideSlot;
    //typedef struct Module Module;
    //typedef struct NameContext NameContext;
    //typedef struct Parse Parse;
    //typedef struct RowSet RowSet;
    //typedef struct Savepoint Savepoint;
    //typedef struct Select Select;
    //typedef struct SrcList SrcList;
    //typedef struct StrAccum StrAccum;
    //typedef struct Table Table;
    //typedef struct TableLock TableLock;
    //typedef struct Token Token;
    //typedef struct Trigger Trigger;
    //typedef struct TriggerPrg TriggerPrg;
    //typedef struct TriggerStep TriggerStep;
    //typedef struct UnpackedRecord UnpackedRecord;
    //typedef struct VTable VTable;
    //typedef struct Walker Walker;
    //typedef struct WherePlan WherePlan;
    //typedef struct WhereInfo WhereInfo;
    //typedef struct WhereLevel WhereLevel;

    /*
    ** Defer sourcing vdbe.h and btree.h until after the "u8" and
    ** "BusyHandler" typedefs. vdbe.h also requires a few of the opaque
    ** pointer types (i.e. FuncDef) defined above.
    */
    //#include "btree.h"
    //#include "vdbe.h"
    //#include "pager.h"
    //#include "pcache_g.h"

    //#include "os.h"
    //#include "mutex.h"

    /*
    ** Each database file to be accessed by the system is an instance
    ** of the following structure.  There are normally two of these structures
    ** in the sqlite.aDb[] array.  aDb[0] is the main database file and
    ** aDb[1] is the database file used to hold temporary tables.  Additional
    ** databases may be attached.
    */
    public class Db
    {
      public string zName;                  /*  Name of this database  */
      public Btree pBt;                     /*  The B Tree structure for this database file  */
      public u8 inTrans;                    /*  0: not writable.  1: Transaction.  2: Checkpoint  */
      public u8 safety_level;               /*  How aggressive at syncing data to disk  */
      public Schema pSchema;                /* Pointer to database schema (possibly shared)  */
    };

    /*
    ** An instance of the following structure stores a database schema.
    */
    public class Schema
    {
      public int schema_cookie;         /* Database schema version number for this file */
      public Hash tblHash = new Hash(); /* All tables indexed by name */
      public Hash idxHash = new Hash(); /* All (named) indices indexed by name */
      public Hash trigHash = new Hash();/* All triggers indexed by name */
      public Hash fkeyHash = new Hash();/* All foreign keys by referenced table name */
      public Table pSeqTab;             /* The sqlite_sequence table used by AUTOINCREMENT */
      public u8 file_format;            /* Schema format version for this file */
      public u8 enc;                    /* Text encoding used by this database */
      public u16 flags;                 /* Flags associated with this schema */
      public int cache_size;            /* Number of pages to use in the cache */
      public Schema Copy()
      {
        if ( this == null )
          return null;
        else
        {
          Schema cp = (Schema)MemberwiseClone();
          return cp;
        }
      }

      public void Clear()
      {
        if ( this != null )
        {
          schema_cookie = 0;
          tblHash = new Hash();
          idxHash = new Hash();
          trigHash = new Hash();
          fkeyHash = new Hash();
          pSeqTab = null;
          flags = 0;
        }
      }
    };

    /*
    ** These macros can be used to test, set, or clear bits in the
    ** Db.pSchema->flags field.
    */
    //#define DbHasProperty(D,I,P)     (((D)->aDb[I].pSchema->flags&(P))==(P))
    static bool DbHasProperty( sqlite3 D, int I, ushort P )
    {
      return ( D.aDb[I].pSchema.flags & P ) == P;
    }
    //#define DbHasAnyProperty(D,I,P)  (((D)->aDb[I].pSchema->flags&(P))!=0)
    //#define DbSetProperty(D,I,P)     (D)->aDb[I].pSchema->flags|=(P)
    static void DbSetProperty( sqlite3 D, int I, ushort P )
    {
      D.aDb[I].pSchema.flags = (u16)( D.aDb[I].pSchema.flags | P );
    }
    //#define DbClearProperty(D,I,P)   (D)->aDb[I].pSchema->flags&=~(P)
    static void DbClearProperty( sqlite3 D, int I, ushort P )
    {
      D.aDb[I].pSchema.flags = (u16)( D.aDb[I].pSchema.flags & ~P );
    }
    /*
    ** Allowed values for the DB.pSchema->flags field.
    **
    ** The DB_SchemaLoaded flag is set after the database schema has been
    ** read into internal hash tables.
    **
    ** DB_UnresetViews means that one or more views have column names that
    ** have been filled out.  If the schema changes, these column names might
    ** changes and so the view will need to be reset.
    */
    //#define DB_SchemaLoaded    0x0001  /* The schema has been loaded */
    //#define DB_UnresetViews    0x0002  /* Some views have defined column names */
    //#define DB_Empty           0x0004  /* The file is empty (length 0 bytes) */
    const u16 DB_SchemaLoaded = 0x0001;
    const u16 DB_UnresetViews = 0x0002;
    const u16 DB_Empty = 0x0004;

    /*
    ** The number of different kinds of things that can be limited
    ** using the sqlite3_limit() interface.
    */
    //#define SQLITE_N_LIMIT (SQLITE_LIMIT_TRIGGER_DEPTH+1)
    const int SQLITE_N_LIMIT = SQLITE_LIMIT_TRIGGER_DEPTH + 1;

    /*
    ** Lookaside malloc is a set of fixed-size buffers that can be used
    ** to satisfy small transient memory allocation requests for objects
    ** associated with a particular database connection.  The use of
    ** lookaside malloc provides a significant performance enhancement
    ** (approx 10%) by avoiding numerous malloc/free requests while parsing
    ** SQL statements.
    **
    ** The Lookaside structure holds configuration information about the
    ** lookaside malloc subsystem.  Each available memory allocation in
    ** the lookaside subsystem is stored on a linked list of LookasideSlot
    ** objects.
    **
    ** Lookaside allocations are only allowed for objects that are associated
    ** with a particular database connection.  Hence, schema information cannot
    ** be stored in lookaside because in shared cache mode the schema information
    ** is shared by multiple database connections.  Therefore, while parsing
    ** schema information, the Lookaside.bEnabled flag is cleared so that
    ** lookaside allocations are not used to construct the schema objects.
    */
    public class Lookaside
    {
      public int sz;               /* Size of each buffer in bytes */
      public u8 bEnabled;          /* False to disable new lookaside allocations */
      public bool bMalloced;       /* True if pStart obtained from sqlite3_malloc() */
      public int nOut;             /* Number of buffers currently checked out */
      public int mxOut;            /* Highwater mark for nOut */
      public int[] anStat = new int[3];        /* 0: hits.  1: size misses.  2: full misses */
      public LookasideSlot pFree;  /* List of available buffers */
      public int pStart;           /* First byte of available memory space */
      public int pEnd;             /* First byte past end of available space */
    };
    public class LookasideSlot
    {
      public LookasideSlot pNext;    /* Next buffer in the list of free buffers */
    };

    /*
    ** A hash table for function definitions.
    **
    ** Hash each FuncDef structure into one of the FuncDefHash.a[] slots.
    ** Collisions are on the FuncDef.pHash chain.
    */
    public class FuncDefHash
    {
      public FuncDef[] a = new FuncDef[23];       /* Hash table for functions */
    };

    /*
    ** Each database connection is an instance of the following structure.
    **
    ** The sqlite.lastRowid records the last insert rowid generated by an
    ** insert statement.  Inserts on views do not affect its value.  Each
    ** trigger has its own context, so that lastRowid can be updated inside
    ** triggers as usual.  The previous value will be restored once the trigger
    ** exits.  Upon entering a before or instead of trigger, lastRowid is no
    ** longer (since after version 2.8.12) reset to -1.
    **
    ** The sqlite.nChange does not count changes within triggers and keeps no
    ** context.  It is reset at start of sqlite3_exec.
    ** The sqlite.lsChange represents the number of changes made by the last
    ** insert, update, or delete statement.  It remains constant throughout the
    ** length of a statement and is then updated by OP_SetCounts.  It keeps a
    ** context stack just like lastRowid so that the count of changes
    ** within a trigger is not seen outside the trigger.  Changes to views do not
    ** affect the value of lsChange.
    ** The sqlite.csChange keeps track of the number of current changes (since
    ** the last statement) and is used to update sqlite_lsChange.
    **
    ** The member variables sqlite.errCode, sqlite.zErrMsg and sqlite.zErrMsg16
    ** store the most recent error code and, if applicable, string. The
    ** internal function sqlite3Error() is used to set these variables
    ** consistently.
    */
    public class sqlite3
    {
      public sqlite3_vfs pVfs;             /* OS Interface */
      public int nDb;                      /* Number of backends currently in use */
      public Db[] aDb = new Db[SQLITE_MAX_ATTACHED];         /* All backends */
      public int flags;                    /* Miscellaneous flags. See below */
      public int openFlags;                /* Flags passed to sqlite3_vfs.xOpen() */
      public int errCode;                  /* Most recent error code (SQLITE_*) */
      public int errMask;                  /* & result codes with this before returning */
      public u8 autoCommit;                /* The auto-commit flag. */
      public u8 temp_store;                /* 1: file 2: memory 0: default */
      // Cannot happen under C#
      //      public u8 mallocFailed;              /* True if we have seen a malloc failure */
      public u8 dfltLockMode;              /* Default locking-mode for attached dbs */
      public int nextAutovac;              /* Autovac setting after VACUUM if >=0 */
      public u8 suppressErr;               /* Do not issue error messages if true */
      public int nextPagesize;             /* Pagesize after VACUUM if >0 */
      public int nTable;                   /* Number of tables in the database */
      public CollSeq pDfltColl;            /* The default collating sequence (BINARY) */
      public i64 lastRowid;                /* ROWID of most recent insert (see above) */
      public u32 magic;                    /* Magic number for detect library misuse */
      public int nChange;                  /* Value returned by sqlite3_changes() */
      public int nTotalChange;             /* Value returned by sqlite3_total_changes() */
      public sqlite3_mutex mutex;          /* Connection mutex */
      public int[] aLimit = new int[SQLITE_N_LIMIT];   /* Limits */
      public class sqlite3InitInfo
      {      /* Information used during initialization */
        public int iDb;                    /* When back is being initialized */
        public int newTnum;                /* Rootpage of table being initialized */
        public u8 busy;                    /* TRUE if currently initializing */
        public u8 orphanTrigger;           /* Last statement is orphaned TEMP trigger */
      };
      public sqlite3InitInfo init = new sqlite3InitInfo();
      public int nExtension;               /* Number of loaded extensions */
      public object[] aExtension;          /* Array of shared library handles */
      public Vdbe pVdbe;                   /* List of active virtual machines */
      public int activeVdbeCnt;            /* Number of VDBEs currently executing */
      public int writeVdbeCnt;             /* Number of active VDBEs that are writing */
      public int vdbeExecCnt;              /* Number of nested calls to VdbeExec() */
      public dxTrace xTrace;//)(void*,const char*);        /* Trace function */
      public object pTraceArg;                          /* Argument to the trace function */
      public dxProfile xProfile;//)(void*,const char*,u64);  /* Profiling function */
      public object pProfileArg;                        /* Argument to profile function */
      public object pCommitArg;                 /* Argument to xCommitCallback() */
      public dxCommitCallback xCommitCallback;//)(void*);    /* Invoked at every commit. */
      public object pRollbackArg;               /* Argument to xRollbackCallback() */
      public dxRollbackCallback xRollbackCallback;//)(void*); /* Invoked at every commit. */
      public object pUpdateArg;
      public dxUpdateCallback xUpdateCallback;//)(void*,int, const char*,const char*,sqlite_int64);
#if !SQLITE_OMIT_WAL
//int (*xWalCallback)(void *, sqlite3 *, const char *, int);
//void *pWalArg;
#endif
      public dxCollNeeded xCollNeeded;//)(void*,sqlite3*,int eTextRep,const char*);
      public dxCollNeeded xCollNeeded16;//)(void*,sqlite3*,int eTextRep,const void*);
      public object pCollNeededArg;
      public sqlite3_value pErr;            /* Most recent error message */
      public string zErrMsg;                /* Most recent error message (UTF-8 encoded) */
      public string zErrMsg16;              /* Most recent error message (UTF-16 encoded) */
      public struct _u1
      {
        public bool isInterrupted;          /* True if sqlite3_interrupt has been called */
        public double notUsed1;            /* Spacer */
      }
      public _u1 u1;
      public Lookaside lookaside = new Lookaside();          /* Lookaside malloc configuration */
#if !SQLITE_OMIT_AUTHORIZATION
public dxAuth xAuth;//)(void*,int,const char*,const char*,const char*,const char*);
/* Access authorization function */
public object pAuthArg;               /* 1st argument to the access auth function */
#endif
#if !SQLITE_OMIT_PROGRESS_CALLBACK
      public dxProgress xProgress;//)(void *);  /* The progress callback */
      public object pProgressArg;               /* Argument to the progress callback */
      public int nProgressOps;                  /* Number of opcodes for progress callback */
#endif
#if !SQLITE_OMIT_VIRTUALTABLE
public Hash aModule;                  /* populated by sqlite3_create_module() */
public Table pVTab;                   /* vtab with active Connect/Create method */
public VTable aVTrans;                /* Virtual tables with open transactions */
public int nVTrans;                   /* Allocated size of aVTrans */
public VTable pDisconnect;            /* Disconnect these in next sqlite3_prepare() */
#endif
      public FuncDefHash aFunc = new FuncDefHash();       /* Hash table of connection functions */
      public Hash aCollSeq = new Hash();                  /* All collating sequences */
      public BusyHandler busyHandler = new BusyHandler(); /* Busy callback */
      public int busyTimeout;                             /* Busy handler timeout, in msec */
      public Db[] aDbStatic = new Db[] { new Db(), new Db() };              /* Static space for the 2 default backends */
      public Savepoint pSavepoint;         /* List of active savepoints */
      public int nSavepoint;               /* Number of non-transaction savepoints */
      public int nStatement;               /* Number of nested statement-transactions  */
      public u8 isTransactionSavepoint;    /* True if the outermost savepoint is a TS */
      public i64 nDeferredCons;            /* Net deferred constraints this transaction. */
      public int pnBytesFreed;             /* If not NULL, increment this in DbFree() */
#if SQLITE_ENABLE_UNLOCK_NOTIFY
/* The following variables are all protected by the STATIC_MASTER
** mutex, not by sqlite3.mutex. They are used by code in notify.c.
**
** When X.pUnlockConnection==Y, that means that X is waiting for Y to
** unlock so that it can proceed.
**
** When X.pBlockingConnection==Y, that means that something that X tried
** tried to do recently failed with an SQLITE_LOCKED error due to locks
** held by Y.
*/
sqlite3 *pBlockingConnection; /* Connection that caused SQLITE_LOCKED */
sqlite3 *pUnlockConnection;           /* Connection to watch for unlock */
void *pUnlockArg;                     /* Argument to xUnlockNotify */
void (*xUnlockNotify)(void **, int);  /* Unlock notify callback */
sqlite3 *pNextBlocked;        /* Next in list of all blocked connections */
#endif
    };

    /*
    ** A macro to discover the encoding of a database.
    */
    //#define ENC(db) ((db)->aDb[0].pSchema->enc)
    static u8 ENC( sqlite3 db )
    {
      return db.aDb[0].pSchema.enc;
    }

    /*
    ** Possible values for the sqlite3.flags.
    */
    //#define SQLITE_VdbeTrace      0x00000100  /* True to trace VDBE execution */
    //#define SQLITE_InternChanges  0x00000200  /* Uncommitted Hash table changes */
    //#define SQLITE_FullColNames   0x00000400  /* Show full column names on SELECT */
    //#define SQLITE_ShortColNames  0x00000800  /* Show short columns names */
    //#define SQLITE_CountRows      0x00001000  /* Count rows changed by INSERT, */
    //                                          /*   DELETE, or UPDATE and return */
    //                                          /*   the count using a callback. */
    //#define SQLITE_NullCallback   0x00002000  /* Invoke the callback once if the */
    //                                          /*   result set is empty */
    //#define SQLITE_SqlTrace       0x00004000  /* Debug print SQL as it executes */
    //#define SQLITE_VdbeListing    0x00008000  /* Debug listings of VDBE programs */
    //#define SQLITE_WriteSchema    0x00010000  /* OK to update SQLITE_MASTER */
    //#define SQLITE_NoReadlock     0x00020000  /* Readlocks are omitted when 
    //                                          ** accessing read-only databases */
    //#define SQLITE_IgnoreChecks   0x00040000  /* Do not enforce check constraints */
    //#define SQLITE_ReadUncommitted 0x0080000  /* For shared-cache mode */
    //#define SQLITE_LegacyFileFmt  0x00100000  /* Create new databases in format 1 */
    //#define SQLITE_FullFSync      0x00200000  /* Use full fsync on the backend */
    //#define SQLITE_CkptFullFSync  0x00400000  /* Use full fsync for checkpoint */
    //#define SQLITE_RecoveryMode   0x00800000  /* Ignore schema errors */
    //#define SQLITE_ReverseOrder   0x01000000  /* Reverse unordered SELECTs */
    //#define SQLITE_RecTriggers    0x02000000  /* Enable recursive triggers */
    //#define SQLITE_ForeignKeys    0x04000000  /* Enforce foreign key constraints  */
    //#define SQLITE_AutoIndex      0x08000000  /* Enable automatic indexes */
    //#define SQLITE_PreferBuiltin  0x10000000  /* Preference to built-in funcs */
    //#define SQLITE_LoadExtension  0x20000000  /* Enable load_extension */
    const int SQLITE_VdbeTrace = 0x00000100;
    const int SQLITE_InternChanges = 0x00000200;
    const int SQLITE_FullColNames = 0x00000400;
    const int SQLITE_ShortColNames = 0x00000800;
    const int SQLITE_CountRows = 0x00001000;
    const int SQLITE_NullCallback = 0x00002000;
    const int SQLITE_SqlTrace = 0x00004000;
    const int SQLITE_VdbeListing = 0x00008000;
    const int SQLITE_WriteSchema = 0x00010000;
    const int SQLITE_NoReadlock = 0x00020000;
    const int SQLITE_IgnoreChecks = 0x00040000;
    const int SQLITE_ReadUncommitted = 0x0080000;
    const int SQLITE_LegacyFileFmt = 0x00100000;
    const int SQLITE_FullFSync = 0x00200000;
    const int SQLITE_CkptFullFSync = 0x00400000;
    const int SQLITE_RecoveryMode = 0x00800000;
    const int SQLITE_ReverseOrder = 0x01000000;
    const int SQLITE_RecTriggers = 0x02000000;
    const int SQLITE_ForeignKeys = 0x04000000;
    const int SQLITE_AutoIndex = 0x08000000;
    const int SQLITE_PreferBuiltin = 0x10000000;
    const int SQLITE_LoadExtension = 0x20000000;

    /*
    ** Bits of the sqlite3.flags field that are used by the
    ** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface.
    ** These must be the low-order bits of the flags field.
    */
    //#define SQLITE_QueryFlattener 0x01        /* Disable query flattening */
    //#define SQLITE_ColumnCache    0x02        /* Disable the column cache */
    //#define SQLITE_IndexSort      0x04        /* Disable indexes for sorting */
    //#define SQLITE_IndexSearch    0x08        /* Disable indexes for searching */
    //#define SQLITE_IndexCover     0x10        /* Disable index covering table */
    //#define SQLITE_GroupByOrder   0x20        /* Disable GROUPBY cover of ORDERBY */
    //#define SQLITE_FactorOutConst 0x40        /* Disable factoring out constants */
    //#define SQLITE_OptMask        0xff        /* Mask of all disablable opts */
    const int SQLITE_QueryFlattener = 0x01;
    const int SQLITE_ColumnCache = 0x02;
    const int SQLITE_IndexSort = 0x04;
    const int SQLITE_IndexSearch = 0x08;
    const int SQLITE_IndexCover = 0x10;
    const int SQLITE_GroupByOrder = 0x20;
    const int SQLITE_FactorOutConst = 0x40;
    const int SQLITE_OptMask = 0xff;

    /*
    ** Possible values for the sqlite.magic field.
    ** The numbers are obtained at random and have no special meaning, other
    ** than being distinct from one another.
    */
    const int SQLITE_MAGIC_OPEN = 0x1029a697;   //#define SQLITE_MAGIC_OPEN     0xa029a697  /* Database is open */
    const int SQLITE_MAGIC_CLOSED = 0x2f3c2d33; //#define SQLITE_MAGIC_CLOSED   0x9f3c2d33  /* Database is closed */
    const int SQLITE_MAGIC_SICK = 0x3b771290;   //#define SQLITE_MAGIC_SICK     0x4b771290  /* Error and awaiting close */
    const int SQLITE_MAGIC_BUSY = 0x403b7906;   //#define SQLITE_MAGIC_BUSY     0xf03b7906  /* Database currently in use */
    const int SQLITE_MAGIC_ERROR = 0x55357930;  //#define SQLITE_MAGIC_ERROR    0xb5357930  /* An SQLITE_MISUSE error occurred */

    /*
    ** Each SQL function is defined by an instance of the following
    ** structure.  A pointer to this structure is stored in the sqlite.aFunc
    ** hash table.  When multiple functions have the same name, the hash table
    ** points to a linked list of these structures.
    */
    public class FuncDef
    {
      public i16 nArg;           /* Number of arguments.  -1 means unlimited */
      public u8 iPrefEnc;        /* Preferred text encoding (SQLITE_UTF8, 16LE, 16BE) */
      public u8 flags;           /* Some combination of SQLITE_FUNC_* */
      public object pUserData;   /* User data parameter */
      public FuncDef pNext;      /* Next function with same name */
      public dxFunc xFunc;//)(sqlite3_context*,int,sqlite3_value**); /* Regular function */
      public dxStep xStep;//)(sqlite3_context*,int,sqlite3_value**); /* Aggregate step */
      public dxFinal xFinalize;//)(sqlite3_context*);                /* Aggregate finalizer */
      public string zName;       /* SQL name of the function. */
      public FuncDef pHash;      /* Next with a different name but the same hash */
      public FuncDestructor pDestructor;   /* Reference counted destructor function */

      public FuncDef()
      {
      }

      public FuncDef( i16 nArg, u8 iPrefEnc, u8 iflags, object pUserData, FuncDef pNext, dxFunc xFunc, dxStep xStep, dxFinal xFinalize, string zName, FuncDef pHash, FuncDestructor pDestructor )
      {
        this.nArg = nArg;
        this.iPrefEnc = iPrefEnc;
        this.flags = iflags;
        this.pUserData = pUserData;
        this.pNext = pNext;
        this.xFunc = xFunc;
        this.xStep = xStep;
        this.xFinalize = xFinalize;
        this.zName = zName;
        this.pHash = pHash;
        this.pDestructor = pDestructor;
      }
      public FuncDef( string zName, u8 iPrefEnc, i16 nArg, int iArg, u8 iflags, dxFunc xFunc )
      {
        this.nArg = nAr…

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