GASATHON/Project/Source/GasaEditor/GasaGen/gencpp/gen.dep.hpp

// This file was generated automatially by gencpp's unreal.cpp (See: https://github.com/Ed94/gencpp)

#pragma once

#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-const-variable"
#pragma clang diagnostic ignored "-Wunused-but-set-variable"
#pragma clang diagnostic ignored "-Wswitch"
#pragma clang diagnostic ignored "-Wunused-variable"
#pragma clang diagnostic ignored "-Wunknown-pragmas"
#pragma clang diagnostic ignored "-Wvarargs"
#pragma clang diagnostic ignored "-Wunused-function"
#endif

#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunknown-pragmas"
#pragma GCC diagnostic ignored "-Wcomment"
#pragma GCC diagnostic ignored "-Wswitch"
#pragma GCC diagnostic ignored "-Wunused-variable"
#endif

#pragma region Platform Detection

/* Platform architecture */

#if defined( _WIN64 ) || defined( __x86_64__ ) || defined( _M_X64 ) || defined( __64BIT__ ) || defined( __powerpc64__ ) || defined( __ppc64__ ) \
    || defined( __aarch64__ )
#ifndef GEN_ARCH_64_BIT
#define GEN_ARCH_64_BIT 1
#endif
#else
#ifndef GEN_ARCH_32_BItxt_StrCaT
#define GEN_ARCH_32_BIT 1
#endif
#endif

/* Platform OS */

#if defined( _WIN32 ) || defined( _WIN64 )
#ifndef GEN_SYSTEM_WINDOWS
#define GEN_SYSTEM_WINDOWS 1
#endif
#elif defined( __APPLE__ ) && defined( __MACH__ )
#ifndef GEN_SYSTEM_OSX
#define GEN_SYSTEM_OSX 1
#endif
#ifndef GEN_SYSTEM_MACOS
#define GEN_SYSTEM_MACOS 1
#endif
#include <TargetConditionals.h>
#if TARGET_IPHONE_SIMULATOR == 1 || TARGET_OS_IPHONE == 1
#ifndef GEN_SYSTEM_IOS
#define GEN_SYSTEM_IOS 1
#endif
#endif
#elif defined( __unix__ )
#ifndef GEN_SYSTEM_UNIX
#define GEN_SYSTEM_UNIX 1
#endif
#if defined( ANDROID ) || defined( __ANDROID__ )
#ifndef GEN_SYSTEM_ANDROID
#define GEN_SYSTEM_ANDROID 1
#endif
#ifndef GEN_SYSTEM_LINUX
#define GEN_SYSTEM_LINUX 1
#endif
#elif defined( __linux__ )
#ifndef GEN_SYSTEM_LINUX
#define GEN_SYSTEM_LINUX 1
#endif
#elif defined( __FreeBSD__ ) || defined( __FreeBSD_kernel__ )
#ifndef GEN_SYSTEM_FREEBSD
#define GEN_SYSTEM_FREEBSD 1
#endif
#elif defined( __OpenBSD__ )
#ifndef GEN_SYSTEM_OPENBSD
#define GEN_SYSTEM_OPENBSD 1
#endif
#elif defined( __EMSCRIPTEN__ )
#ifndef GEN_SYSTEM_EMSCRIPTEN
#define GEN_SYSTEM_EMSCRIPTEN 1
#endif
#elif defined( __CYGWIN__ )
#ifndef GEN_SYSTEM_CYGWIN
#define GEN_SYSTEM_CYGWIN 1
#endif
#else
#error This UNIX operating system is not supported
#endif
#else
#error This operating system is not supported
#endif

/* Platform compiler */

#if defined( _MSC_VER )
#define GEN_COMPILER_MSVC 1
#elif defined( __GNUC__ )
#define GEN_COMPILER_GCC 1
#elif defined( __clang__ )
#define GEN_COMPILER_CLANG 1
#elif defined( __MINGW32__ )
#define GEN_COMPILER_MINGW 1
#error Unknown compiler
#endif

#if defined( __has_attribute )
#define GEN_HAS_ATTRIBUTE( attribute ) __has_attribute( attribute )
#else
#define GEN_HAS_ATTRIBUTE( attribute ) ( 0 )
#endif

#if defined( GEN_GCC_VERSION_CHECK )
#undef GEN_GCC_VERSION_CHECK
#endif
#if defined( GEN_GCC_VERSION )
#define GEN_GCC_VERSION_CHECK( major, minor, patch ) ( GEN_GCC_VERSION >= GEN_VERSION_ENCODE( major, minor, patch ) )
#else
#define GEN_GCC_VERSION_CHECK( major, minor, patch ) ( 0 )
#endif

#define GEN_DEF_INLINE  static
#define GEN_IMPL_INLINE static inline

#pragma endregion Platform Detection

#pragma region Mandatory Includes

#include <stdarg.h>
#include <stddef.h>

#if defined( GEN_SYSTEM_WINDOWS )
#include <intrin.h>
#endif

#pragma endregion Mandatory Includes

#ifdef GEN_DONT_USE_NAMESPACE
#define GEN_NS
#define GEN_NS_BEGIN
#define GEN_NS_END
#else
#define GEN_NS gen::
#define GEN_NS_BEGIN \
	namespace gen    \
	{
#define GEN_NS_END }
#endif

GEN_NS_BEGIN
#ifdef GEN_INTELLISENSE_DIRECTIVES
#pragma once
#include "header_start.hpp"
#endif

#pragma region Macros

#define zpl_cast( Type ) ( Type )

// Keywords

#define global                  // Global variables
#define internal      static    // Internal linkage
#define local_persist static    // Local Persisting variables

#pragma region ForceInline Definition
#ifdef GEN_COMPILER_MSVC
#define FORCEINLINE __forceinline
#define neverinline __declspec( noinline )
#elif defined( GEN_COMPILER_GCC )
#define FORCEINLINE inline __attribute__( ( __always_inline__ ) )
#define neverinline __attribute__( ( __noinline__ ) )
#elif defined( GEN_COMPILER_CLANG )
#if __has_attribute( __always_inline__ )
#define FORCEINLINE inline __attribute__( ( __always_inline__ ) )
#define neverinline __attribute__( ( __noinline__ ) )
#else
#define FORCEINLINE
#define neverinline
#endif
#else
#define FORCEINLINE
#define neverinline
#endif
#pragma endregion ForceInline Definition

// Bits

#ifndef bit
#define bit( Value )                           ( 1 << Value )
#define bitfield_is_equal( Type, Field, Mask ) ( ( Type( Mask ) & Type( Field ) ) == Type( Mask ) )
#endif

// Casting

#ifndef ccast
#define ccast( Type, Value ) ( *const_cast<Type*>( &( Value ) ) )
#define pcast( Type, Value ) ( *reinterpret_cast<Type*>( &( Value ) ) )
#define rcast( Type, Value ) reinterpret_cast<Type>( Value )
#define scast( Type, Value ) static_cast<Type>( Value )
#endif

// Num Arguments (Varadics)
// #if defined(__GNUC__) || defined(__clang__)
// Supports 0-50 arguments
#define num_args_impl( \
    _0,                \
    _1,                \
    _2,                \
    _3,                \
    _4,                \
    _5,                \
    _6,                \
    _7,                \
    _8,                \
    _9,                \
    _10,               \
    _11,               \
    _12,               \
    _13,               \
    _14,               \
    _15,               \
    _16,               \
    _17,               \
    _18,               \
    _19,               \
    _20,               \
    _21,               \
    _22,               \
    _23,               \
    _24,               \
    _25,               \
    _26,               \
    _27,               \
    _28,               \
    _29,               \
    _30,               \
    _31,               \
    _32,               \
    _33,               \
    _34,               \
    _35,               \
    _36,               \
    _37,               \
    _38,               \
    _39,               \
    _40,               \
    _41,               \
    _42,               \
    _43,               \
    _44,               \
    _45,               \
    _46,               \
    _47,               \
    _48,               \
    _49,               \
    _50,               \
    _51,               \
    _52,               \
    _53,               \
    _54,               \
    _55,               \
    _56,               \
    _57,               \
    _58,               \
    _59,               \
    _60,               \
    _61,               \
    _62,               \
    _63,               \
    _64,               \
    _65,               \
    _66,               \
    _67,               \
    _68,               \
    _69,               \
    _70,               \
    _71,               \
    _72,               \
    _73,               \
    _74,               \
    _75,               \
    _76,               \
    _77,               \
    _78,               \
    _79,               \
    _80,               \
    _81,               \
    _82,               \
    _83,               \
    _84,               \
    _85,               \
    _86,               \
    _87,               \
    _88,               \
    _89,               \
    _90,               \
    _91,               \
    _92,               \
    _93,               \
    _94,               \
    _95,               \
    _96,               \
    _97,               \
    _98,               \
    _99,               \
    _100,              \
    N,                 \
    ...                \
)                      \
	N

// ## deletes preceding comma if _VA_ARGS__ is empty (GCC, Clang)
#define num_args( ... ) \
	num_args_impl(      \
	    _,              \
	    ##__VA_ARGS__,  \
	    100,            \
	    99,             \
	    98,             \
	    97,             \
	    96,             \
	    95,             \
	    94,             \
	    93,             \
	    92,             \
	    91,             \
	    90,             \
	    89,             \
	    88,             \
	    87,             \
	    86,             \
	    85,             \
	    84,             \
	    83,             \
	    82,             \
	    81,             \
	    80,             \
	    79,             \
	    78,             \
	    77,             \
	    76,             \
	    75,             \
	    74,             \
	    73,             \
	    72,             \
	    71,             \
	    70,             \
	    69,             \
	    68,             \
	    67,             \
	    66,             \
	    65,             \
	    64,             \
	    63,             \
	    62,             \
	    61,             \
	    60,             \
	    59,             \
	    58,             \
	    57,             \
	    56,             \
	    55,             \
	    54,             \
	    53,             \
	    52,             \
	    51,             \
	    50,             \
	    49,             \
	    48,             \
	    47,             \
	    46,             \
	    45,             \
	    44,             \
	    43,             \
	    42,             \
	    41,             \
	    40,             \
	    39,             \
	    38,             \
	    37,             \
	    36,             \
	    35,             \
	    34,             \
	    33,             \
	    32,             \
	    31,             \
	    30,             \
	    29,             \
	    28,             \
	    27,             \
	    26,             \
	    25,             \
	    24,             \
	    23,             \
	    22,             \
	    21,             \
	    20,             \
	    19,             \
	    18,             \
	    17,             \
	    16,             \
	    15,             \
	    14,             \
	    13,             \
	    12,             \
	    11,             \
	    10,             \
	    9,              \
	    8,              \
	    7,              \
	    6,              \
	    5,              \
	    4,              \
	    3,              \
	    2,              \
	    1,              \
	    0               \
	)

// #else
// This doesn't work on latest msvc so I had to use /Zc:preprocessor flag.

// Supports 1-50 arguments
// #define num_args_impl(                                  \
// 		_1,  _2,  _3,  _4,  _5,  _6,  _7,  _8,  _9, _10,   \
// 		_11, _12, _13, _14, _15, _16, _17, _18, _19, _20,  \
// 		_21, _22, _23, _24, _25, _26, _27, _28, _29, _30,  \
// 		_31, _32, _33, _34, _35, _36, _37, _38, _39, _40,  \
// 		_41, _42, _43, _44, _45, _46, _47, _48, _49, _50,  \
// 		_51, _52, _53, _54, _55, _56, _57, _58, _59, _60,  \
// 		_61, _62, _63, _64, _65, _66, _67, _68, _69, _70,  \
// 		_71, _72, _73, _74, _75, _76, _77, _78, _79, _80,  \
// 		_81, _82, _83, _84, _85, _86, _87, _88, _89, _90,  \
// 		_91, _92, _93, _94, _95, _96, _97, _98, _99, _100, \
// 		N, ...                                             \
// 	) N

// #define num_args(...)                         \
// 	num_args_impl( __VA_ARGS__,                  \
// 		100, 99, 98, 97, 96, 95, 94, 93, 92, 91, \
// 		 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, \
// 		 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, \
// 		 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, \
// 		 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, \
// 		 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, \
// 		 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, \
// 		 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, \
// 		 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, \
// 		 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, \
// 		 10,  9,  8,  7,  6,  5,  4,  3,  2,  1  \
// 	)
// #endif

// Stringizing
#define stringize_va( ... ) #__VA_ARGS__
#define stringize( ... )    stringize_va( __VA_ARGS__ )

// Function do once

#define do_once()                 \
	do                            \
	{                             \
		static bool Done = false; \
		if ( Done )               \
			return;               \
		Done = true;              \
	} while ( 0 )

#define do_once_start             \
	do                            \
	{                             \
		static bool Done = false; \
		if ( Done )               \
			break;                \
		Done = true;

#define do_once_end \
	}               \
	while ( 0 )     \
		;

#define labeled_scope_start \
	if ( false )            \
	{
#define labeled_scope_end             }

#define clamp( x, lower, upper )      min( max( ( x ), ( lower ) ), ( upper ) )
#define count_of( x )                 ( ( size_of( x ) / size_of( 0 [x] ) ) / ( (sw)( ! ( size_of( x ) % size_of( 0 [x] ) ) ) ) )
#define is_between( x, lower, upper ) ( ( ( lower ) <= ( x ) ) && ( ( x ) <= ( upper ) ) )
#define max( a, b )                   ( ( a ) > ( b ) ? ( a ) : ( b ) )
#define min( a, b )                   ( ( a ) < ( b ) ? ( a ) : ( b ) )
#define size_of( x )                  ( sw )( sizeof( x ) )

#if defined( _MSC_VER ) || defined( GEN_COMPILER_TINYC )
#define offset_of( Type, element ) ( ( GEN_NS( gen_sw ) ) & ( ( (Type*)0 )->element ) )
#else
#define offset_of( Type, element ) __builtin_offsetof( Type, element )
#endif

template<class Type>
void swap( Type& a, Type& b )
{
	Type tmp = a;
	a        = b;
	b        = tmp;
}

#pragma endregion Macros

#pragma region Basic Types

#define GEN_U8_MIN  0u
#define GEN_U8_MAX  0xffu
#define GEN_I8_MIN  ( -0x7f - 1 )
#define GEN_I8_MAX  0x7f

#define GEN_U16_MIN 0u
#define GEN_U16_MAX 0xffffu
#define GEN_I16_MIN ( -0x7fff - 1 )
#define GEN_I16_MAX 0x7fff

#define GEN_U32_MIN 0u
#define GEN_U32_MAX 0xffffffffu
#define GEN_I32_MIN ( -0x7fffffff - 1 )
#define GEN_I32_MAX 0x7fffffff

#define GEN_U64_MIN 0ull
#define GEN_U64_MAX 0xffffffffffffffffull
#define GEN_I64_MIN ( -0x7fffffffffffffffll - 1 )
#define GEN_I64_MAX 0x7fffffffffffffffll

#if defined( GEN_ARCH_32_BIT )
#define GEN_USIZE_MIN GEN_U32_MIN
#define GEN_USIZE_MAX GEN_U32_MAX
#define GEN_ISIZE_MIN GEN_S32_MIN
#define GEN_ISIZE_MAX GEN_S32_MAX
#elif defined( GEN_ARCH_64_BIT )
#define GEN_USIZE_MIN GEN_U64_MIN
#define GEN_USIZE_MAX GEN_U64_MAX
#define GEN_ISIZE_MIN GEN_I64_MIN
#define GEN_ISIZE_MAX GEN_I64_MAX
#else
#error Unknown architecture size. This library only supports 32 bit and 64 bit architectures.
#endif

#define GEN_F32_MIN 1.17549435e-38f
#define GEN_F32_MAX 3.40282347e+38f
#define GEN_F64_MIN 2.2250738585072014e-308
#define GEN_F64_MAX 1.7976931348623157e+308

#if defined( GEN_COMPILER_MSVC )
#if _MSC_VER < 1300
typedef unsigned char  u8;
typedef signed char    s8;
typedef unsigned short u16;
typedef signed short   s16;
typedef unsigned int   u32;
typedef signed int     s32;
#else
typedef unsigned __int8  u8;
typedef signed __int8    s8;
typedef unsigned __int16 u16;
typedef signed __int16   s16;
typedef unsigned __int32 u32;
typedef signed __int32   s32;
#endif
typedef unsigned __int64 u64;
typedef signed __int64   s64;
#else
#include <stdint.h>

typedef uint8_t  u8;
typedef int8_t   s8;
typedef uint16_t u16;
typedef int16_t  s16;
typedef uint32_t u32;
typedef int32_t  s32;
typedef uint64_t u64;
typedef int64_t  s64;
#endif

static_assert( sizeof( u8 ) == sizeof( s8 ), "sizeof(u8) != sizeof(s8)" );
static_assert( sizeof( u16 ) == sizeof( s16 ), "sizeof(u16) != sizeof(s16)" );
static_assert( sizeof( u32 ) == sizeof( s32 ), "sizeof(u32) != sizeof(s32)" );
static_assert( sizeof( u64 ) == sizeof( s64 ), "sizeof(u64) != sizeof(s64)" );

static_assert( sizeof( u8 ) == 1, "sizeof(u8) != 1" );
static_assert( sizeof( u16 ) == 2, "sizeof(u16) != 2" );
static_assert( sizeof( u32 ) == 4, "sizeof(u32) != 4" );
static_assert( sizeof( u64 ) == 8, "sizeof(u64) != 8" );

typedef size_t    uw;
typedef ptrdiff_t sw;

static_assert( sizeof( uw ) == sizeof( sw ), "sizeof(uw) != sizeof(sw)" );

// NOTE: (u)zpl_intptr is only here for semantic reasons really as this library will only support 32/64 bit OSes.
#if defined( _WIN64 )
typedef signed __int64   sptr;
typedef unsigned __int64 uptr;
#elif defined( _WIN32 )
// NOTE; To mark types changing their size, e.g. zpl_intptr
#ifndef _W64
#if ! defined( __midl ) && ( defined( _X86_ ) || defined( _M_IX86 ) ) && _MSC_VER >= 1300
#define _W64 __w64
#else
#define _W64
#endif
#endif
typedef _W64 signed int   sptr;
typedef _W64 unsigned int uptr;
#else
typedef uintptr_t uptr;
typedef intptr_t  sptr;
#endif

static_assert( sizeof( uptr ) == sizeof( sptr ), "sizeof(uptr) != sizeof(sptr)" );

typedef float  f32;
typedef double f64;

static_assert( sizeof( f32 ) == 4, "sizeof(f32) != 4" );
static_assert( sizeof( f64 ) == 8, "sizeof(f64) != 8" );

typedef s8  b8;
typedef s16 b16;
typedef s32 b32;

#pragma endregion Basic Types

#pragma region Debug

#if defined( _MSC_VER )
#if _MSC_VER < 1300
#define GEN_DEBUG_TRAP() __asm int 3 /* Trap to debugger! */
#else
#define GEN_DEBUG_TRAP() __debugbreak()
#endif
#elif defined( GEN_COMPILER_TINYC )
#define GEN_DEBUG_TRAP() process_exit( 1 )
#else
#define GEN_DEBUG_TRAP() __builtin_trap()
#endif

#define GEN_ASSERT( cond ) GEN_ASSERT_MSG( cond, NULL )

#define GEN_ASSERT_MSG( cond, msg, ... )                                                     \
	do                                                                                       \
	{                                                                                        \
		if ( ! ( cond ) )                                                                    \
		{                                                                                    \
			assert_handler( #cond, __FILE__, zpl_cast( s64 ) __LINE__, msg, ##__VA_ARGS__ ); \
			GEN_DEBUG_TRAP();                                                                \
		}                                                                                    \
	} while ( 0 )

#define GEN_ASSERT_NOT_NULL( ptr ) GEN_ASSERT_MSG( ( ptr ) != NULL, #ptr " must not be NULL" )

// NOTE: Things that shouldn't happen with a message!
#define GEN_PANIC( msg, ... ) GEN_ASSERT_MSG( 0, msg, ##__VA_ARGS__ )

void assert_handler( char const* condition, char const* file, s32 line, char const* msg, ... );
s32  assert_crash( char const* condition );
void process_exit( u32 code );

#if Build_Debug
#define GEN_FATAL( ... )                                                \
	do                                                                  \
	{                                                                   \
		local_persist thread_local char buf[GEN_PRINTF_MAXLEN] = { 0 }; \
                                                                        \
		str_fmt( buf, GEN_PRINTF_MAXLEN, __VA_ARGS__ );                 \
		GEN_PANIC( buf );                                               \
	} while ( 0 )
#else

#define GEN_FATAL( ... )                \
	do                                  \
	{                                   \
		str_fmt_out_err( __VA_ARGS__ ); \
		process_exit( 1 );              \
	} while ( 0 )
#endif

#pragma endregion Debug

#pragma region Memory

#define kilobytes( x )     ( ( x ) * (s64)( 1024 ) )
#define megabytes( x )     ( kilobytes( x ) * (s64)( 1024 ) )
#define gigabytes( x )     ( megabytes( x ) * (s64)( 1024 ) )
#define terabytes( x )     ( gigabytes( x ) * (s64)( 1024 ) )

#define GEN__ONES          ( zpl_cast( uw ) - 1 / GEN_U8_MAX )
#define GEN__HIGHS         ( GEN__ONES * ( GEN_U8_MAX / 2 + 1 ) )
#define GEN__HAS_ZERO( x ) ( ( ( x ) - GEN__ONES ) & ~( x ) & GEN__HIGHS )

//! Checks if value is power of 2.
GEN_DEF_INLINE b32 is_power_of_two( sw x );

//! Aligns address to specified alignment.
GEN_DEF_INLINE void* align_forward( void* ptr, sw alignment );

//! Aligns value to a specified alignment.
GEN_DEF_INLINE s64 align_forward_i64( s64 value, sw alignment );

//! Moves pointer forward by bytes.
GEN_DEF_INLINE void* pointer_add( void* ptr, sw bytes );

//! Moves pointer forward by bytes.
GEN_DEF_INLINE void const* pointer_add_const( void const* ptr, sw bytes );

//! Calculates difference between two addresses.
GEN_DEF_INLINE sw pointer_diff( void const* begin, void const* end );

//! Copy non-overlapping memory from source to destination.
void* mem_copy( void* dest, void const* source, sw size );

//! Search for a constant value within the size limit at memory location.
void const* mem_find( void const* data, u8 byte_value, sw size );

//! Copy memory from source to destination.
GEN_DEF_INLINE void* mem_move( void* dest, void const* source, sw size );

//! Set constant value at memory location with specified size.
GEN_DEF_INLINE void* mem_set( void* data, u8 byte_value, sw size );

//! @param ptr Memory location to clear up.
//! @param size The size to clear up with.
GEN_DEF_INLINE void zero_size( void* ptr, sw size );

//! Clears up an item.
#define zero_item( t ) zero_size( ( t ), size_of( *( t ) ) )    // NOTE: Pass pointer of struct

//! Clears up an array.
#define zero_array( a, count ) zero_size( ( a ), size_of( *( a ) ) * count )

enum AllocType : u8
{
	EAllocation_ALLOC,
	EAllocation_FREE,
	EAllocation_FREE_ALL,
	EAllocation_RESIZE,
};

using AllocatorProc = void*( void* allocator_data, AllocType type, sw size, sw alignment, void* old_memory, sw old_size, u64 flags );

struct AllocatorInfo
{
	AllocatorProc* Proc;
	void*          Data;
};

enum AllocFlag
{
	ALLOCATOR_FLAG_CLEAR_TO_ZERO = bit( 0 ),
};

#ifndef GEN_DEFAULT_MEMORY_ALIGNMENT
#define GEN_DEFAULT_MEMORY_ALIGNMENT ( 2 * size_of( void* ) )
#endif

#ifndef GEN_DEFAULT_ALLOCATOR_FLAGS
#define GEN_DEFAULT_ALLOCATOR_FLAGS ( ALLOCATOR_FLAG_CLEAR_TO_ZERO )
#endif

//! Allocate memory with default alignment.
GEN_DEF_INLINE void* alloc( AllocatorInfo a, sw size );

//! Allocate memory with specified alignment.
GEN_DEF_INLINE void* alloc_align( AllocatorInfo a, sw size, sw alignment );

//! Free allocated memory.
GEN_DEF_INLINE void free( AllocatorInfo a, void* ptr );

//! Free all memory allocated by an allocator.
GEN_DEF_INLINE void free_all( AllocatorInfo a );

//! Resize an allocated memory.
GEN_DEF_INLINE void* resize( AllocatorInfo a, void* ptr, sw old_size, sw new_size );

//! Resize an allocated memory with specified alignment.
GEN_DEF_INLINE void* resize_align( AllocatorInfo a, void* ptr, sw old_size, sw new_size, sw alignment );

//! Allocate memory for an item.
#define alloc_item( allocator_, Type ) (Type*)alloc( allocator_, size_of( Type ) )

//! Allocate memory for an array of items.
#define alloc_array( allocator_, Type, count ) (Type*)alloc( allocator_, size_of( Type ) * ( count ) )

/* heap memory analysis tools */
/* define GEN_HEAP_ANALYSIS to enable this feature */
/* call zpl_heap_stats_init at the beginning of the entry point */
/* you can call zpl_heap_stats_check near the end of the execution to validate any possible leaks */
void heap_stats_init( void );
sw   heap_stats_used_memory( void );
sw   heap_stats_alloc_count( void );
void heap_stats_check( void );

//! Allocate/Resize memory using default options.

//! Use this if you don't need a "fancy" resize allocation
GEN_DEF_INLINE void* default_resize_align( AllocatorInfo a, void* ptr, sw old_size, sw new_size, sw alignment );

void* heap_allocator_proc( void* allocator_data, AllocType type, sw size, sw alignment, void* old_memory, sw old_size, u64 flags );

//! The heap allocator backed by operating system's memory manager.
constexpr AllocatorInfo heap( void )
{
	return { heap_allocator_proc, nullptr };
}

//! Helper to allocate memory using heap allocator.
#define malloc( sz ) alloc( heap(), sz )

//! Helper to free memory allocated by heap allocator.
#define mfree( ptr ) free( heap(), ptr )

GEN_IMPL_INLINE b32 is_power_of_two( sw x )
{
	if ( x <= 0 )
		return false;
	return ! ( x & ( x - 1 ) );
}

GEN_IMPL_INLINE void* align_forward( void* ptr, sw alignment )
{
	uptr p;

	GEN_ASSERT( is_power_of_two( alignment ) );

	p = zpl_cast( uptr ) ptr;
	return zpl_cast( void* )( ( p + ( alignment - 1 ) ) & ~( alignment - 1 ) );
}

GEN_IMPL_INLINE s64 align_forward_i64( s64 value, sw alignment )
{
	return value + ( alignment - value % alignment ) % alignment;
}

GEN_IMPL_INLINE void* pointer_add( void* ptr, sw bytes )
{
	return zpl_cast( void* )( zpl_cast( u8* ) ptr + bytes );
}

GEN_IMPL_INLINE void const* pointer_add_const( void const* ptr, sw bytes )
{
	return zpl_cast( void const* )( zpl_cast( u8 const* ) ptr + bytes );
}

GEN_IMPL_INLINE sw pointer_diff( void const* begin, void const* end )
{
	return zpl_cast( sw )( zpl_cast( u8 const* ) end - zpl_cast( u8 const* ) begin );
}

GEN_IMPL_INLINE void* mem_move( void* dest, void const* source, sw n )
{
	if ( dest == NULL )
	{
		return NULL;
	}

	u8*       d = zpl_cast( u8* ) dest;
	u8 const* s = zpl_cast( u8 const* ) source;

	if ( d == s )
		return d;
	if ( s + n <= d || d + n <= s )    // NOTE: Non-overlapping
		return mem_copy( d, s, n );

	if ( d < s )
	{
		if ( zpl_cast( uptr ) s % size_of( sw ) == zpl_cast( uptr ) d % size_of( sw ) )
		{
			while ( zpl_cast( uptr ) d % size_of( sw ) )
			{
				if ( ! n-- )
					return dest;
				*d++ = *s++;
			}
			while ( n >= size_of( sw ) )
			{
				*zpl_cast( sw* ) d  = *zpl_cast( sw* ) s;
				n                  -= size_of( sw );
				d                  += size_of( sw );
				s                  += size_of( sw );
			}
		}
		for ( ; n; n-- )
			*d++ = *s++;
	}
	else
	{
		if ( ( zpl_cast( uptr ) s % size_of( sw ) ) == ( zpl_cast( uptr ) d % size_of( sw ) ) )
		{
			while ( zpl_cast( uptr )( d + n ) % size_of( sw ) )
			{
				if ( ! n-- )
					return dest;
				d[n] = s[n];
			}
			while ( n >= size_of( sw ) )
			{
				n                         -= size_of( sw );
				*zpl_cast( sw* )( d + n )  = *zpl_cast( sw* )( s + n );
			}
		}
		while ( n )
			n--, d[n] = s[n];
	}

	return dest;
}

GEN_IMPL_INLINE void* mem_set( void* dest, u8 c, sw n )
{
	if ( dest == NULL )
	{
		return NULL;
	}

	u8* s = zpl_cast( u8* ) dest;
	sw  k;
	u32 c32 = ( (u32)-1 ) / 255 * c;

	if ( n == 0 )
		return dest;
	s[0] = s[n - 1] = c;
	if ( n < 3 )
		return dest;
	s[1] = s[n - 2] = c;
	s[2] = s[n - 3] = c;
	if ( n < 7 )
		return dest;
	s[3] = s[n - 4] = c;
	if ( n < 9 )
		return dest;

	k                               = -zpl_cast( sptr ) s & 3;
	s                              += k;
	n                              -= k;
	n                              &= -4;

	*zpl_cast( u32* )( s + 0 )      = c32;
	*zpl_cast( u32* )( s + n - 4 )  = c32;
	if ( n < 9 )
		return dest;
	*zpl_cast( u32* )( s + 4 )      = c32;
	*zpl_cast( u32* )( s + 8 )      = c32;
	*zpl_cast( u32* )( s + n - 12 ) = c32;
	*zpl_cast( u32* )( s + n - 8 )  = c32;
	if ( n < 25 )
		return dest;
	*zpl_cast( u32* )( s + 12 )      = c32;
	*zpl_cast( u32* )( s + 16 )      = c32;
	*zpl_cast( u32* )( s + 20 )      = c32;
	*zpl_cast( u32* )( s + 24 )      = c32;
	*zpl_cast( u32* )( s + n - 28 )  = c32;
	*zpl_cast( u32* )( s + n - 24 )  = c32;
	*zpl_cast( u32* )( s + n - 20 )  = c32;
	*zpl_cast( u32* )( s + n - 16 )  = c32;

	k                                = 24 + ( zpl_cast( uptr ) s & 4 );
	s                               += k;
	n                               -= k;

	{
		u64 c64 = ( zpl_cast( u64 ) c32 << 32 ) | c32;
		while ( n > 31 )
		{
			*zpl_cast( u64* )( s + 0 )   = c64;
			*zpl_cast( u64* )( s + 8 )   = c64;
			*zpl_cast( u64* )( s + 16 )  = c64;
			*zpl_cast( u64* )( s + 24 )  = c64;

			n                           -= 32;
			s                           += 32;
		}
	}

	return dest;
}

GEN_IMPL_INLINE void* alloc_align( AllocatorInfo a, sw size, sw alignment )
{
	return a.Proc( a.Data, EAllocation_ALLOC, size, alignment, nullptr, 0, GEN_DEFAULT_ALLOCATOR_FLAGS );
}

GEN_IMPL_INLINE void* alloc( AllocatorInfo a, sw size )
{
	return alloc_align( a, size, GEN_DEFAULT_MEMORY_ALIGNMENT );
}

GEN_IMPL_INLINE void free( AllocatorInfo a, void* ptr )
{
	if ( ptr != nullptr )
		a.Proc( a.Data, EAllocation_FREE, 0, 0, ptr, 0, GEN_DEFAULT_ALLOCATOR_FLAGS );
}

GEN_IMPL_INLINE void free_all( AllocatorInfo a )
{
	a.Proc( a.Data, EAllocation_FREE_ALL, 0, 0, nullptr, 0, GEN_DEFAULT_ALLOCATOR_FLAGS );
}

GEN_IMPL_INLINE void* resize( AllocatorInfo a, void* ptr, sw old_size, sw new_size )
{
	return resize_align( a, ptr, old_size, new_size, GEN_DEFAULT_MEMORY_ALIGNMENT );
}

GEN_IMPL_INLINE void* resize_align( AllocatorInfo a, void* ptr, sw old_size, sw new_size, sw alignment )
{
	return a.Proc( a.Data, EAllocation_RESIZE, new_size, alignment, ptr, old_size, GEN_DEFAULT_ALLOCATOR_FLAGS );
}

GEN_IMPL_INLINE void* default_resize_align( AllocatorInfo a, void* old_memory, sw old_size, sw new_size, sw alignment )
{
	if ( ! old_memory )
		return alloc_align( a, new_size, alignment );

	if ( new_size == 0 )
	{
		free( a, old_memory );
		return nullptr;
	}

	if ( new_size < old_size )
		new_size = old_size;

	if ( old_size == new_size )
	{
		return old_memory;
	}
	else
	{
		void* new_memory = alloc_align( a, new_size, alignment );
		if ( ! new_memory )
			return nullptr;
		mem_move( new_memory, old_memory, min( new_size, old_size ) );
		free( a, old_memory );
		return new_memory;
	}
}

GEN_IMPL_INLINE void zero_size( void* ptr, sw size )
{
	mem_set( ptr, 0, size );
}

struct VirtualMemory
{
	void* data;
	sw    size;
};

//! Initialize virtual memory from existing data.
VirtualMemory vm_from_memory( void* data, sw size );

//! Allocate virtual memory at address with size.

//! @param addr The starting address of the region to reserve. If NULL, it lets operating system to decide where to allocate it.
//! @param size The size to serve.
VirtualMemory vm_alloc( void* addr, sw size );

//! Release the virtual memory.
b32 vm_free( VirtualMemory vm );

//! Trim virtual memory.
VirtualMemory vm_trim( VirtualMemory vm, sw lead_size, sw size );

//! Purge virtual memory.
b32 gen_vm_purge( VirtualMemory vm );

//! Retrieve VM's page size and alignment.
sw gen_virtual_memory_page_size( sw* alignment_out );

struct Arena
{
	static void* allocator_proc( void* allocator_data, AllocType type, sw size, sw alignment, void* old_memory, sw old_size, u64 flags );

	static Arena init_from_memory( void* start, sw size )
	{
		return {
			{ nullptr, nullptr },
			start,
			size,
			0,
			0
		};
	}

	static Arena init_from_allocator( AllocatorInfo backing, sw size )
	{
		Arena result = { backing, alloc( backing, size ), size, 0, 0 };
		return result;
	}

	static Arena init_sub( Arena& parent, sw size )
	{
		return init_from_allocator( parent.Backing, size );
	}

	sw alignment_of( sw alignment )
	{
		sw alignment_offset, result_pointer, mask;
		GEN_ASSERT( is_power_of_two( alignment ) );

		alignment_offset = 0;
		result_pointer   = (sw)PhysicalStart + TotalUsed;
		mask             = alignment - 1;

		if ( result_pointer & mask )
			alignment_offset = alignment - ( result_pointer & mask );

		return alignment_offset;
	}

// This id is defined by Unreal for asserts
#pragma push_macro( "check" )
#undef check

	void check()
	{
		GEN_ASSERT( TempCount == 0 );
	}

#pragma pop_macro( "check" )

	void free()
	{
		if ( Backing.Proc )
		{
			gen::free( Backing, PhysicalStart );
			PhysicalStart = nullptr;
		}
	}

	sw size_remaining( sw alignment )
	{
		sw result = TotalSize - ( TotalUsed + alignment_of( alignment ) );
		return result;
	}

	AllocatorInfo Backing;
	void*         PhysicalStart;
	sw            TotalSize;
	sw            TotalUsed;
	sw            TempCount;

	operator AllocatorInfo()
	{
		return { allocator_proc, this };
	}
};

// Just a wrapper around using an arena with memory associated with its scope instead of from an allocator.
// Used for static segment or stack allocations.
template<s32 Size>
struct FixedArena
{
	static FixedArena init()
	{
		FixedArena result = { Arena::init_from_memory( result.memory, Size ), { 0 } };
		return result;
	}

	sw size_remaining( sw alignment )
	{
		return arena.size_remaining( alignment );
	}

	operator AllocatorInfo()
	{
		return { Arena::allocator_proc, &arena };
	}

	Arena arena;
	char  memory[Size];
};

using Arena_1KB   = FixedArena<kilobytes( 1 )>;
using Arena_4KB   = FixedArena<kilobytes( 4 )>;
using Arena_8KB   = FixedArena<kilobytes( 8 )>;
using Arena_16KB  = FixedArena<kilobytes( 16 )>;
using Arena_32KB  = FixedArena<kilobytes( 32 )>;
using Arena_64KB  = FixedArena<kilobytes( 64 )>;
using Arena_128KB = FixedArena<kilobytes( 128 )>;
using Arena_256KB = FixedArena<kilobytes( 256 )>;
using Arena_512KB = FixedArena<kilobytes( 512 )>;
using Arena_1MB   = FixedArena<megabytes( 1 )>;
using Arena_2MB   = FixedArena<megabytes( 2 )>;
using Arena_4MB   = FixedArena<megabytes( 4 )>;

struct Pool
{
	static void* allocator_proc( void* allocator_data, AllocType type, sw size, sw alignment, void* old_memory, sw old_size, u64 flags );

	static Pool init( AllocatorInfo backing, sw num_blocks, sw block_size )
	{
		return init_align( backing, num_blocks, block_size, GEN_DEFAULT_MEMORY_ALIGNMENT );
	}

	static Pool init_align( AllocatorInfo backing, sw num_blocks, sw block_size, sw block_align );

	void clear();

	void free()
	{
		if ( Backing.Proc )
		{
			gen::free( Backing, PhysicalStart );
		}
	}

	AllocatorInfo Backing;
	void*         PhysicalStart;
	void*         FreeList;
	sw            BlockSize;
	sw            BlockAlign;
	sw            TotalSize;
	sw            NumBlocks;

	operator AllocatorInfo()
	{
		return { allocator_proc, this };
	}
};

#pragma endregion Memory

#pragma region String Ops

GEN_DEF_INLINE const char* char_first_occurence( const char* str, char c );
constexpr auto             str_find = &char_first_occurence;

GEN_DEF_INLINE b32  char_is_alpha( char c );
GEN_DEF_INLINE b32  char_is_alphanumeric( char c );
GEN_DEF_INLINE b32  char_is_digit( char c );
GEN_DEF_INLINE b32  char_is_hex_digit( char c );
GEN_DEF_INLINE b32  char_is_space( char c );
GEN_DEF_INLINE char char_to_lower( char c );
GEN_DEF_INLINE char char_to_upper( char c );

GEN_DEF_INLINE s32 digit_to_int( char c );
GEN_DEF_INLINE s32 hex_digit_to_int( char c );

GEN_DEF_INLINE s32         str_compare( const char* s1, const char* s2 );
GEN_DEF_INLINE s32         str_compare( const char* s1, const char* s2, sw len );
GEN_DEF_INLINE char*       str_copy( char* dest, const char* source, sw len );
GEN_DEF_INLINE sw          str_copy_nulpad( char* dest, const char* source, sw len );
GEN_DEF_INLINE sw          str_len( const char* str );
GEN_DEF_INLINE sw          str_len( const char* str, sw max_len );
GEN_DEF_INLINE char*       str_reverse( char* str );    // NOTE: ASCII only
GEN_DEF_INLINE char const* str_skip( char const* str, char c );
GEN_DEF_INLINE char const* str_skip_any( char const* str, char const* char_list );
GEN_DEF_INLINE char const* str_trim( char const* str, b32 catch_newline );

// NOTE: ASCII only
GEN_DEF_INLINE void str_to_lower( char* str );
GEN_DEF_INLINE void str_to_upper( char* str );

s64  str_to_i64( const char* str, char** end_ptr, s32 base );
void i64_to_str( s64 value, char* string, s32 base );
void u64_to_str( u64 value, char* string, s32 base );
f64  str_to_f64( const char* str, char** end_ptr );

GEN_IMPL_INLINE const char* char_first_occurence( const char* s, char c )
{
	char ch = c;
	for ( ; *s != ch; s++ )
	{
		if ( *s == '\0' )
			return NULL;
	}
	return s;
}

GEN_IMPL_INLINE b32 char_is_alpha( char c )
{
	if ( ( c >= 'A' && c <= 'Z' ) || ( c >= 'a' && c <= 'z' ) )
		return true;
	return false;
}

GEN_IMPL_INLINE b32 char_is_alphanumeric( char c )
{
	return char_is_alpha( c ) || char_is_digit( c );
}

GEN_IMPL_INLINE b32 char_is_digit( char c )
{
	if ( c >= '0' && c <= '9' )
		return true;
	return false;
}

GEN_IMPL_INLINE b32 char_is_hex_digit( char c )
{
	if ( char_is_digit( c ) || ( c >= 'a' && c <= 'f' ) || ( c >= 'A' && c <= 'F' ) )
		return true;
	return false;
}

GEN_IMPL_INLINE b32 char_is_space( char c )
{
	if ( c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v' )
		return true;
	return false;
}

GEN_IMPL_INLINE char char_to_lower( char c )
{
	if ( c >= 'A' && c <= 'Z' )
		return 'a' + ( c - 'A' );
	return c;
}

GEN_IMPL_INLINE char char_to_upper( char c )
{
	if ( c >= 'a' && c <= 'z' )
		return 'A' + ( c - 'a' );
	return c;
}

GEN_IMPL_INLINE s32 digit_to_int( char c )
{
	return char_is_digit( c ) ? c - '0' : c - 'W';
}

GEN_IMPL_INLINE s32 hex_digit_to_int( char c )
{
	if ( char_is_digit( c ) )
		return digit_to_int( c );
	else if ( is_between( c, 'a', 'f' ) )
		return c - 'a' + 10;
	else if ( is_between( c, 'A', 'F' ) )
		return c - 'A' + 10;
	return -1;
}

GEN_IMPL_INLINE s32 str_compare( const char* s1, const char* s2 )
{
	while ( *s1 && ( *s1 == *s2 ) )
	{
		s1++, s2++;
	}
	return *(u8*)s1 - *(u8*)s2;
}

GEN_IMPL_INLINE s32 str_compare( const char* s1, const char* s2, sw len )
{
	for ( ; len > 0; s1++, s2++, len-- )
	{
		if ( *s1 != *s2 )
			return ( ( s1 < s2 ) ? -1 : +1 );
		else if ( *s1 == '\0' )
			return 0;
	}
	return 0;
}

GEN_IMPL_INLINE char* str_copy( char* dest, const char* source, sw len )
{
	GEN_ASSERT_NOT_NULL( dest );
	if ( source )
	{
		char* str = dest;
		while ( len > 0 && *source )
		{
			*str++ = *source++;
			len--;
		}
		while ( len > 0 )
		{
			*str++ = '\0';
			len--;
		}
	}
	return dest;
}

GEN_IMPL_INLINE sw str_copy_nulpad( char* dest, const char* source, sw len )
{
	sw result = 0;
	GEN_ASSERT_NOT_NULL( dest );
	if ( source )
	{
		const char* source_start = source;
		char*       str          = dest;
		while ( len > 0 && *source )
		{
			*str++ = *source++;
			len--;
		}
		while ( len > 0 )
		{
			*str++ = '\0';
			len--;
		}

		result = source - source_start;
	}
	return result;
}

GEN_IMPL_INLINE sw str_len( const char* str )
{
	if ( str == NULL )
	{
		return 0;
	}
	const char* p = str;
	while ( *str )
		str++;
	return str - p;
}

GEN_IMPL_INLINE sw str_len( const char* str, sw max_len )
{
	const char* end = zpl_cast( const char* ) mem_find( str, 0, max_len );
	if ( end )
		return end - str;
	return max_len;
}

GEN_IMPL_INLINE char* str_reverse( char* str )
{
	sw    len  = str_len( str );
	char* a    = str + 0;
	char* b    = str + len - 1;
	len       /= 2;
	while ( len-- )
	{
		swap( *a, *b );
		a++, b--;
	}
	return str;
}

GEN_IMPL_INLINE char const* str_skip( char const* str, char c )
{
	while ( *str && *str != c )
	{
		++str;
	}
	return str;
}

GEN_IMPL_INLINE char const* str_skip_any( char const* str, char const* char_list )
{
	char const* closest_ptr     = zpl_cast( char const* ) pointer_add( (void*)str, str_len( str ) );
	sw          char_list_count = str_len( char_list );
	for ( sw i = 0; i < char_list_count; i++ )
	{
		char const* p = str_skip( str, char_list[i] );
		closest_ptr   = min( closest_ptr, p );
	}
	return closest_ptr;
}

GEN_IMPL_INLINE char const* str_trim( char const* str, b32 catch_newline )
{
	while ( *str && char_is_space( *str ) && ( ! catch_newline || ( catch_newline && *str != '\n' ) ) )
	{
		++str;
	}
	return str;
}

GEN_IMPL_INLINE void str_to_lower( char* str )
{
	if ( ! str )
		return;
	while ( *str )
	{
		*str = char_to_lower( *str );
		str++;
	}
}

GEN_IMPL_INLINE void str_to_upper( char* str )
{
	if ( ! str )
		return;
	while ( *str )
	{
		*str = char_to_upper( *str );
		str++;
	}
}

#pragma endregion String Ops

#pragma region Printing

struct FileInfo;

#ifndef GEN_PRINTF_MAXLEN
#define GEN_PRINTF_MAXLEN kilobytes( 128 )
#endif

// NOTE: A locally persisting buffer is used internally
char* str_fmt_buf( char const* fmt, ... );
char* str_fmt_buf_va( char const* fmt, va_list va );
sw    str_fmt( char* str, sw n, char const* fmt, ... );
sw    str_fmt_va( char* str, sw n, char const* fmt, va_list va );
sw    str_fmt_out_va( char const* fmt, va_list va );
sw    str_fmt_out_err( char const* fmt, ... );
sw    str_fmt_out_err_va( char const* fmt, va_list va );
sw    str_fmt_file( FileInfo* f, char const* fmt, ... );
sw    str_fmt_file_va( FileInfo* f, char const* fmt, va_list va );

constexpr char const* Msg_Invalid_Value = "INVALID VALUE PROVIDED";

inline sw log_fmt( char const* fmt, ... )
{
	sw      res;
	va_list va;

	va_start( va, fmt );
	res = str_fmt_out_va( fmt, va );
	va_end( va );

	return res;
}

#pragma endregion Printing

#pragma region Containers

template<class TType>
struct RemoveConst
{
	typedef TType Type;
};

template<class TType>
struct RemoveConst<const TType>
{
	typedef TType Type;
};

template<class TType>
struct RemoveConst<const TType[]>
{
	typedef TType Type[];
};

template<class TType, uw Size>
struct RemoveConst<const TType[Size]>
{
	typedef TType Type[Size];
};

template<class TType>
using TRemoveConst = typename RemoveConst<TType>::Type;

template<class Type>
struct Array
{
	struct Header
	{
		AllocatorInfo Allocator;
		uw            Capacity;
		uw            Num;
	};

	static Array init( AllocatorInfo allocator )
	{
		return init_reserve( allocator, grow_formula( 0 ) );
	}

	static Array init_reserve( AllocatorInfo allocator, sw capacity )
	{
		Header* header = rcast( Header*, alloc( allocator, sizeof( Header ) + sizeof( Type ) * capacity ) );

		if ( header == nullptr )
			return { nullptr };

		header->Allocator = allocator;
		header->Capacity  = capacity;
		header->Num       = 0;

		return { rcast( Type*, header + 1 ) };
	}

	static uw grow_formula( uw value )
	{
		return 2 * value + 8;
	}

	bool append( Array other )
	{
		return append( other, other.num() );
	}

	bool append( Type value )
	{
		Header* header = get_header();

		if ( header->Num == header->Capacity )
		{
			if ( ! grow( header->Capacity ) )
				return false;

			header = get_header();
		}

		Data[header->Num] = value;
		header->Num++;

		return true;
	}

	bool append( Type* items, uw item_num )
	{
		Header* header = get_header();

		if ( header->Num + item_num > header->Capacity )
		{
			if ( ! grow( header->Capacity + item_num ) )
				return false;

			header = get_header();
		}

		mem_copy( Data + header->Num, items, item_num * sizeof( Type ) );
		header->Num += item_num;

		return true;
	}

	bool append_at( Type item, uw idx )
	{
		Header* header = get_header();

		if ( idx >= header->Num )
			idx = header->Num - 1;

		if ( idx < 0 )
			idx = 0;

		if ( header->Capacity < header->Num + 1 )
		{
			if ( ! grow( header->Capacity + 1 ) )
				return false;

			header = get_header();
		}

		Type* target = Data + idx;

		mem_move( target + 1, target, ( header->Num - idx ) * sizeof( Type ) );
		header->Num++;

		return true;
	}

	bool append_at( Type* items, uw item_num, uw idx )
	{
		Header* header = get_header();

		if ( idx >= header->Num )
		{
			return append( items, item_num );
		}

		if ( item_num > header->Capacity )
		{
			if ( ! grow( header->Capacity + item_num ) )
				return false;

			header = get_header();
		}

		Type* target = Data + idx + item_num;
		Type* src    = Data + idx;

		mem_move( target, src, ( header->Num - idx ) * sizeof( Type ) );
		mem_copy( src, items, item_num * sizeof( Type ) );
		header->Num += item_num;

		return true;
	}

	Type& back( void )
	{
		Header& header = *get_header();
		return Data[header.Num - 1];
	}

	void clear( void )
	{
		Header& header = *get_header();
		header.Num     = 0;
	}

	bool fill( uw begin, uw end, Type value )
	{
		Header& header = *get_header();

		if ( begin < 0 || end > header.Num )
			return false;

		for ( sw idx = sw( begin ); idx < sw( end ); idx++ )
		{
			Data[idx] = value;
		}

		return true;
	}

	void free( void )
	{
		Header& header = *get_header();
		gen::free( header.Allocator, &header );
		Data = nullptr;
	}

	Header* get_header( void )
	{
		using NonConstType = TRemoveConst<Type>;
		return rcast( Header*, const_cast<NonConstType*>( Data ) ) - 1;
	}

	bool grow( uw min_capacity )
	{
		Header& header       = *get_header();
		uw      new_capacity = grow_formula( header.Capacity );

		if ( new_capacity < min_capacity )
			new_capacity = min_capacity;

		return set_capacity( new_capacity );
	}

	uw num( void )
	{
		return get_header()->Num;
	}

	void pop( void )
	{
		Header& header = *get_header();

		GEN_ASSERT( header.Num > 0 );
		header.Num--;
	}

	void remove_at( uw idx )
	{
		Header* header = get_header();
		GEN_ASSERT( idx < header->Num );

		mem_move( header + idx, header + idx + 1, sizeof( Type ) * ( header->Num - idx - 1 ) );
		header->Num--;
	}

	bool reserve( uw new_capacity )
	{
		Header& header = *get_header();

		if ( header.Capacity < new_capacity )
			return set_capacity( new_capacity );

		return true;
	}

	bool resize( uw num )
	{
		Header* header = get_header();

		if ( header->Capacity < num )
		{
			if ( ! grow( num ) )
				return false;

			header = get_header();
		}

		header->Num = num;
		return true;
	}

	bool set_capacity( uw new_capacity )
	{
		Header& header = *get_header();

		if ( new_capacity == header.Capacity )
			return true;

		if ( new_capacity < header.Num )
		{
			// Already have the memory, mine as well keep it.
			header.Num = new_capacity;
			return true;
		}

		sw      size       = sizeof( Header ) + sizeof( Type ) * new_capacity;
		Header* new_header = rcast( Header*, alloc( header.Allocator, size ) );

		if ( new_header == nullptr )
			return false;

		mem_move( new_header, &header, sizeof( Header ) + sizeof( Type ) * header.Num );

		new_header->Capacity = new_capacity;

		gen::free( header.Allocator, &header );

		Data = rcast( Type*, new_header + 1 );
		return true;
	}

	Type* Data;

	operator Type*()
	{
		return Data;
	}

	operator Type const*() const
	{
		return Data;
	}

	// For-range based support

	Type* begin()
	{
		return Data;
	}

	Type* end()
	{
		return Data + get_header()->Num;
	}
};

// TODO(Ed) : This thing needs ALOT of work.

template<typename Type>
struct HashTable
{
	struct FindResult
	{
		sw HashIndex;
		sw PrevIndex;
		sw EntryIndex;
	};

	struct Entry
	{
		u64  Key;
		sw   Next;
		Type Value;
	};

	static constexpr f32 CriticalLoadScale = 0.7f;

	static HashTable init( AllocatorInfo allocator )
	{
		HashTable<Type> result = init_reserve( allocator, 8 );
		return result;
	}

	static HashTable init_reserve( AllocatorInfo allocator, uw num )
	{
		HashTable<Type> result          = { { nullptr }, { nullptr } };

		result.Hashes                   = Array<sw>::init_reserve( allocator, num );
		result.Hashes.get_header()->Num = num;
		result.Hashes.resize( num );
		result.Hashes.fill( 0, num, -1 );

		result.Entries = Array<Entry>::init_reserve( allocator, num );
		return result;
	}

	void clear( void )
	{
		Entries.clear();
		Hashes.fill( 0, Hashes.num(), -1 );
	}

	void destroy( void )
	{
		if ( Hashes && Hashes.get_header()->Capacity )
		{
			Hashes.free();
			Entries.free();
		}
	}

	Type* get( u64 key )
	{
		sw idx = find( key ).EntryIndex;
		if ( idx >= 0 )
			return &Entries[idx].Value;

		return nullptr;
	}

	using MapProc = void ( * )( u64 key, Type value );

	void map( MapProc map_proc )
	{
		GEN_ASSERT_NOT_NULL( map_proc );

		for ( sw idx = 0; idx < sw( Entries.num() ); ++idx )
		{
			map_proc( Entries[idx].Key, Entries[idx].Value );
		}
	}

	using MapMutProc = void ( * )( u64 key, Type* value );

	void map_mut( MapMutProc map_proc )
	{
		GEN_ASSERT_NOT_NULL( map_proc );

		for ( sw idx = 0; idx < sw( Entries.num() ); ++idx )
		{
			map_proc( Entries[idx].Key, &Entries[idx].Value );
		}
	}

	void grow()
	{
		sw new_num = Array<Entry>::grow_formula( Entries.num() );
		rehash( new_num );
	}

	void rehash( sw new_num )
	{
		sw last_added_index;

		HashTable<Type> new_ht = init_reserve( Hashes.get_header()->Allocator, new_num );
		for ( sw idx = 0; idx < sw( Entries.num() ); ++idx )
		{
			FindResult find_result;

			Entry& entry     = Entries[idx];
			find_result      = new_ht.find( entry.Key );
			last_added_index = new_ht.add_entry( entry.Key );

			if ( find_result.PrevIndex < 0 )
				new_ht.Hashes[find_result.HashIndex] = last_added_index;
			else
				new_ht.Entries[find_result.PrevIndex].Next = last_added_index;

			new_ht.Entries[last_added_index].Next  = find_result.EntryIndex;
			new_ht.Entries[last_added_index].Value = entry.Value;
		}

		destroy();
		*this = new_ht;
	}

	void rehash_fast()
	{
		sw idx;

		for ( idx = 0; idx < sw( Entries.num() ); idx++ )
			Entries[idx].Next = -1;

		for ( idx = 0; idx < sw( Hashes.num() ); idx++ )
			Hashes[idx] = -1;

		for ( idx = 0; idx < sw( Entries.num() ); idx++ )
		{
			Entry*     entry;
			FindResult find_result;

			entry       = &Entries[idx];
			find_result = find( entry->Key );

			if ( find_result.PrevIndex < 0 )
				Hashes[find_result.HashIndex] = idx;
			else
				Entries[find_result.PrevIndex].Next = idx;
		}
	}

	void remove( u64 key )
	{
		FindResult find_result = find( key );

		if ( find_result.EntryIndex >= 0 )
		{
			Entries.remove_at( find_result.EntryIndex );
			rehash_fast();
		}
	}

	void remove_entry( sw idx )
	{
		Entries.remove_at( idx );
	}

	void set( u64 key, Type value )
	{
		sw         idx;
		FindResult find_result;

		if ( full() )
			grow();

		find_result = find( key );
		if ( find_result.EntryIndex >= 0 )
		{
			idx = find_result.EntryIndex;
		}
		else
		{
			idx = add_entry( key );

			if ( find_result.PrevIndex >= 0 )
			{
				Entries[find_result.PrevIndex].Next = idx;
			}
			else
			{
				Hashes[find_result.HashIndex] = idx;
			}
		}

		Entries[idx].Value = value;

		if ( full() )
			grow();
	}

	sw slot( u64 key )
	{
		for ( sw idx = 0; idx < sw( Hashes.num() ); ++idx )
			if ( Hashes[idx] == key )
				return idx;

		return -1;
	}

	Array<sw>    Hashes;
	Array<Entry> Entries;

protected:
	sw add_entry( u64 key )
	{
		sw    idx;
		Entry entry = { key, -1 };

		idx         = Entries.num();
		Entries.append( entry );
		return idx;
	}

	FindResult find( u64 key )
	{
		FindResult result = { -1, -1, -1 };

		if ( Hashes.num() > 0 )
		{
			result.HashIndex  = key % Hashes.num();
			result.EntryIndex = Hashes[result.HashIndex];

			while ( result.EntryIndex >= 0 )
			{
				if ( Entries[result.EntryIndex].Key == key )
					break;

				result.PrevIndex  = result.EntryIndex;
				result.EntryIndex = Entries[result.EntryIndex].Next;
			}
		}

		return result;
	}

	b32 full()
	{
		uw  critical_load = uw( CriticalLoadScale * f32( Hashes.num() ) );
		b32 result        = Entries.num() > critical_load;
		return result;
	}
};

#pragma endregion Containers

#pragma region Hashing

u32 crc32( void const* data, sw len );
u64 crc64( void const* data, sw len );

#pragma endregion Hashing

#pragma region Strings

// Constant string with length.
struct StrC
{
	sw          Len;
	char const* Ptr;

	operator char const*() const
	{
		return Ptr;
	}

	char const& operator[]( sw index ) const
	{
		return Ptr[index];
	}
};

#define cast_to_strc( str ) *rcast( StrC*, ( str ) - sizeof( sw ) )
#define txt( text )                  \
	StrC                             \
	{                                \
		sizeof( text ) - 1, ( text ) \
	}

inline StrC to_str( char const* str )
{
	return { str_len( str ), str };
}

// Dynamic String
// This is directly based off the ZPL string api.
// They used a header pattern
// I kept it for simplicty of porting but its not necessary to keep it that way.
struct String
{
	struct Header
	{
		AllocatorInfo Allocator;
		sw            Capacity;
		sw            Length;
	};

	static uw grow_formula( uw value )
	{
		// Using a very aggressive growth formula to reduce time mem_copying with recursive calls to append in this library.
		return 4 * value + 8;
	}

	static String make( AllocatorInfo allocator, char const* str )
	{
		sw length = str ? str_len( str ) : 0;
		return make_length( allocator, str, length );
	}

	static String make( AllocatorInfo allocator, StrC str )
	{
		return make_length( allocator, str.Ptr, str.Len );
	}

	static String make_reserve( AllocatorInfo allocator, sw capacity );

	static String make_length( AllocatorInfo allocator, char const* str, sw length );

	static String fmt( AllocatorInfo allocator, char* buf, sw buf_size, char const* fmt, ... );

	static String fmt_buf( AllocatorInfo allocator, char const* fmt, ... );

	static String join( AllocatorInfo allocator, char const** parts, sw num_parts, char const* glue )
	{
		String result = make( allocator, "" );

		for ( sw idx = 0; idx < num_parts; ++idx )
		{
			result.append( parts[idx] );

			if ( idx < num_parts - 1 )
				result.append( glue );
		}

		return result;
	}

	static bool are_equal( String lhs, String rhs )
	{
		if ( lhs.length() != rhs.length() )
			return false;

		for ( sw idx = 0; idx < lhs.length(); ++idx )
			if ( lhs[idx] != rhs[idx] )
				return false;

		return true;
	}

	static bool are_equal( String lhs, StrC rhs )
	{
		if ( lhs.length() != ( rhs.Len ) )
			return false;

		for ( sw idx = 0; idx < lhs.length(); ++idx )
			if ( lhs[idx] != rhs[idx] )
				return false;

		return true;
	}

	bool make_space_for( char const* str, sw add_len );

	bool append( char c )
	{
		return append( &c, 1 );
	}

	bool append( char const* str )
	{
		return append( str, str_len( str ) );
	}

	bool append( char const* str, sw length )
	{
		if ( sptr( str ) > 0 )
		{
			sw curr_len = this->length();

			if ( ! make_space_for( str, length ) )
				return false;

			Header& header = get_header();

			mem_copy( Data + curr_len, str, length );

			Data[curr_len + length] = '\0';

			header.Length           = curr_len + length;
		}
		return str != nullptr;
	}

	bool append( StrC str )
	{
		return append( str.Ptr, str.Len );
	}

	bool append( const String other )
	{
		return append( other.Data, other.length() );
	}

	bool append_fmt( char const* fmt, ... );

	sw avail_space() const
	{
		Header const& header = *rcast( Header const*, Data - sizeof( Header ) );

		return header.Capacity - header.Length;
	}

	char& back()
	{
		return Data[length() - 1];
	}

	sw capacity() const
	{
		Header const& header = *rcast( Header const*, Data - sizeof( Header ) );

		return header.Capacity;
	}

	void clear()
	{
		get_header().Length = 0;
	}

	String duplicate( AllocatorInfo allocator ) const
	{
		return make_length( allocator, Data, length() );
	}

	void free()
	{
		if ( ! Data )
			return;

		Header& header = get_header();

		gen::free( header.Allocator, &header );
	}

	Header& get_header()
	{
		return *(Header*)( Data - sizeof( Header ) );
	}

	sw length() const
	{
		Header const& header = *rcast( Header const*, Data - sizeof( Header ) );

		return header.Length;
	}

	b32 starts_with( StrC substring ) const
	{
		if ( substring.Len > length() )
			return false;

		b32 result = str_compare( Data, substring.Ptr, substring.Len ) == 0;
		return result;
	}

	b32 starts_with( String substring ) const
	{
		if ( substring.length() > length() )
			return false;

		b32 result = str_compare( Data, substring, substring.length() - 1 ) == 0;
		return result;
	}

	void skip_line()
	{
#define current ( *scanner )
		char* scanner = Data;
		while ( current != '\r' && current != '\n' )
		{
			++scanner;
		}

		s32 new_length = scanner - Data;

		if ( current == '\r' )
		{
			new_length += 1;
		}

		mem_move( Data, scanner, new_length );

		Header* header = &get_header();
		header->Length = new_length;
#undef current
	}

	void strip_space()
	{
		char* write_pos = Data;
		char* read_pos  = Data;

		while ( *read_pos )
		{
			if ( ! char_is_space( *read_pos ) )
			{
				*write_pos = *read_pos;
				write_pos++;
			}
			read_pos++;
		}

		write_pos[0] = '\0';    // Null-terminate the modified string

		// Update the length if needed
		get_header().Length = write_pos - Data;
	}

	void trim( char const* cut_set )
	{
		sw len          = 0;

		char* start_pos = Data;
		char* end_pos   = Data + length() - 1;

		while ( start_pos <= end_pos && char_first_occurence( cut_set, *start_pos ) )
			start_pos++;

		while ( end_pos > start_pos && char_first_occurence( cut_set, *end_pos ) )
			end_pos--;

		len = scast( sw, ( start_pos > end_pos ) ? 0 : ( ( end_pos - start_pos ) + 1 ) );

		if ( Data != start_pos )
			mem_move( Data, start_pos, len );

		Data[len]           = '\0';

		get_header().Length = len;
	}

	void trim_space()
	{
		return trim( " \t\r\n\v\f" );
	}

	// Debug function that provides a copy of the string with whitespace characters visualized.
	String visualize_whitespace() const
	{
		Header* header = (Header*)( Data - sizeof( Header ) );

		String result  = make_reserve( header->Allocator, length() * 2 );    // Assume worst case for space requirements.

		for ( char c : *this )
		{
			switch ( c )
			{
				case ' ' :
					result.append( txt( "·" ) );
					break;
				case '\t' :
					result.append( txt( "→" ) );
					break;
				case '\n' :
					result.append( txt( "↵" ) );
					break;
				case '\r' :
					result.append( txt( "⏎" ) );
					break;
				case '\v' :
					result.append( txt( "⇕" ) );
					break;
				case '\f' :
					result.append( txt( "⌂" ) );
					break;
				default :
					result.append( c );
					break;
			}
		}

		return result;
	}

	// For-range support

	char* begin() const
	{
		return Data;
	}

	char* end() const
	{
		Header const& header = *rcast( Header const*, Data - sizeof( Header ) );

		return Data + header.Length;
	}

	operator bool()
	{
		return Data != nullptr;
	}

	operator char*()
	{
		return Data;
	}

	operator char const*() const
	{
		return Data;
	}

	operator StrC() const
	{
		return { length(), Data };
	}

	// Used with cached strings
	// Essentially makes the string a string view.
	String const& operator=( String const& other ) const
	{
		if ( this == &other )
			return *this;

		String& this_ = ccast( String, *this );

		this_.Data    = other.Data;

		return this_;
	}

	char& operator[]( sw index )
	{
		return Data[index];
	}

	char const& operator[]( sw index ) const
	{
		return Data[index];
	}

	char* Data;
};

struct String_POD
{
	char* Data;
};

static_assert( sizeof( String_POD ) == sizeof( String ), "String is not a POD" );

// Implements basic string interning. Data structure is based off the ZPL Hashtable.
using StringTable = HashTable<String const>;

// Represents strings cached with the string table.
// Should never be modified, if changed string is desired, cache_string( str ) another.
using StringCached = String const;

#pragma endregion Strings

#pragma region File Handling

typedef u32 FileMode;

enum FileModeFlag
{
	EFileMode_READ   = bit( 0 ),
	EFileMode_WRITE  = bit( 1 ),
	EFileMode_APPEND = bit( 2 ),
	EFileMode_RW     = bit( 3 ),
	GEN_FILE_MODES   = EFileMode_READ | EFileMode_WRITE | EFileMode_APPEND | EFileMode_RW,
};

// NOTE: Only used internally and for the file operations
enum SeekWhenceType
{
	ESeekWhence_BEGIN   = 0,
	ESeekWhence_CURRENT = 1,
	ESeekWhence_END     = 2,
};

enum FileError
{
	EFileError_NONE,
	EFileError_INVALID,
	EFileError_INVALID_FILENAME,
	EFileError_EXISTS,
	EFileError_NOT_EXISTS,
	EFileError_PERMISSION,
	EFileError_TRUNCATION_FAILURE,
	EFileError_NOT_EMPTY,
	EFileError_NAME_TOO_LONG,
	EFileError_UNKNOWN,
};

union FileDescriptor
{
	void* p;
	sptr  i;
	uptr  u;
};

typedef struct FileOperations FileOperations;

#define GEN_FILE_OPEN_PROC( name )     FileError name( FileDescriptor* fd, FileOperations* ops, FileMode mode, char const* filename )
#define GEN_FILE_READ_AT_PROC( name )  b32 name( FileDescriptor fd, void* buffer, sw size, s64 offset, sw* bytes_read, b32 stop_at_newline )
#define GEN_FILE_WRITE_AT_PROC( name ) b32 name( FileDescriptor fd, void const* buffer, sw size, s64 offset, sw* bytes_written )
#define GEN_FILE_SEEK_PROC( name )     b32 name( FileDescriptor fd, s64 offset, SeekWhenceType whence, s64* new_offset )
#define GEN_FILE_CLOSE_PROC( name )    void name( FileDescriptor fd )

typedef GEN_FILE_OPEN_PROC( file_open_proc );
typedef GEN_FILE_READ_AT_PROC( FileReadProc );
typedef GEN_FILE_WRITE_AT_PROC( FileWriteProc );
typedef GEN_FILE_SEEK_PROC( FileSeekProc );
typedef GEN_FILE_CLOSE_PROC( FileCloseProc );

struct FileOperations
{
	FileReadProc*  read_at;
	FileWriteProc* write_at;
	FileSeekProc*  seek;
	FileCloseProc* close;
};

extern FileOperations const default_file_operations;

typedef u64 FileTime;

enum DirType
{
	GEN_DIR_TYPE_FILE,
	GEN_DIR_TYPE_FOLDER,
	GEN_DIR_TYPE_UNKNOWN,
};

struct DirInfo;

struct DirEntry
{
	char const*     filename;
	struct DirInfo* dir_info;
	u8              type;
};

struct DirInfo
{
	char const* fullpath;
	DirEntry*   entries;    // zpl_array

	// Internals
	char** filenames;    // zpl_array
	String buf;
};

struct FileInfo
{
	FileOperations ops;
	FileDescriptor fd;
	b32            is_temp;

	char const* filename;
	FileTime    last_write_time;
	DirEntry*   dir;
};

enum FileStandardType
{
	EFileStandard_INPUT,
	EFileStandard_OUTPUT,
	EFileStandard_ERROR,

	EFileStandard_COUNT,
};

/**
 * Get standard file I/O.
 * @param  std Check zpl_file_standard_type
 * @return     File handle to standard I/O
 */
FileInfo* file_get_standard( FileStandardType std );

/**
 * Closes the file
 * @param  file
 */
FileError file_close( FileInfo* file );

/**
 * Returns the currently opened file's name
 * @param  file
 */
inline char const* file_name( FileInfo* file )
{
	return file->filename ? file->filename : "";
}

/**
 * Opens a file
 * @param  file
 * @param  filename
 */
FileError file_open( FileInfo* file, char const* filename );

/**
 * Opens a file using a specified mode
 * @param  file
 * @param  mode     Access mode to use
 * @param  filename
 */
FileError file_open_mode( FileInfo* file, FileMode mode, char const* filename );

/**
 * Reads from a file
 * @param  file
 * @param  buffer Buffer to read to
 * @param  size   Size to read
 */
GEN_DEF_INLINE b32 file_read( FileInfo* file, void* buffer, sw size );

/**
 * Reads file at a specific offset
 * @param  file
 * @param  buffer     Buffer to read to
 * @param  size       Size to read
 * @param  offset     Offset to read from
 * @param  bytes_read How much data we've actually read
 */
GEN_DEF_INLINE b32 file_read_at( FileInfo* file, void* buffer, sw size, s64 offset );

/**
 * Reads file safely
 * @param  file
 * @param  buffer     Buffer to read to
 * @param  size       Size to read
 * @param  offset     Offset to read from
 * @param  bytes_read How much data we've actually read
 */
GEN_DEF_INLINE b32 file_read_at_check( FileInfo* file, void* buffer, sw size, s64 offset, sw* bytes_read );

struct FileContents
{
	AllocatorInfo allocator;
	void*         data;
	sw            size;
};

constexpr b32 zero_terminate    = true;
constexpr b32 no_zero_terminate = false;

/**
 * Reads the whole file contents
 * @param  a              Allocator to use
 * @param  zero_terminate End the read data with null terminator
 * @param  filepath       Path to the file
 * @return                File contents data
 */
FileContents file_read_contents( AllocatorInfo a, b32 zero_terminate, char const* filepath );

/**
 * Returns a size of the file
 * @param  file
 * @return      File size
 */
s64 file_size( FileInfo* file );

/**
 * Seeks the file cursor from the beginning of file to a specific position
 * @param  file
 * @param  offset Offset to seek to
 */
GEN_DEF_INLINE s64 file_seek( FileInfo* file, s64 offset );

/**
 * Seeks the file cursor to the end of the file
 * @param  file
 */
GEN_DEF_INLINE s64 file_seek_to_end( FileInfo* file );

/**
 * Returns the length from the beginning of the file we've read so far
 * @param  file
 * @return      Our current position in file
 */
GEN_DEF_INLINE s64 file_tell( FileInfo* file );

/**
 * Writes to a file
 * @param  file
 * @param  buffer Buffer to read from
 * @param  size   Size to read
 */
GEN_DEF_INLINE b32 file_write( FileInfo* file, void const* buffer, sw size );

/**
 * Writes to file at a specific offset
 * @param  file
 * @param  buffer        Buffer to read from
 * @param  size          Size to write
 * @param  offset        Offset to write to
 * @param  bytes_written How much data we've actually written
 */
GEN_DEF_INLINE b32 file_write_at( FileInfo* file, void const* buffer, sw size, s64 offset );

/**
 * Writes to file safely
 * @param  file
 * @param  buffer        Buffer to read from
 * @param  size          Size to write
 * @param  offset        Offset to write to
 * @param  bytes_written How much data we've actually written
 */
GEN_DEF_INLINE b32 file_write_at_check( FileInfo* file, void const* buffer, sw size, s64 offset, sw* bytes_written );

GEN_IMPL_INLINE s64 file_seek( FileInfo* f, s64 offset )
{
	s64 new_offset = 0;

	if ( ! f->ops.read_at )
		f->ops = default_file_operations;

	f->ops.seek( f->fd, offset, ESeekWhence_BEGIN, &new_offset );

	return new_offset;
}

GEN_IMPL_INLINE s64 file_seek_to_end( FileInfo* f )
{
	s64 new_offset = 0;

	if ( ! f->ops.read_at )
		f->ops = default_file_operations;

	f->ops.seek( f->fd, 0, ESeekWhence_END, &new_offset );

	return new_offset;
}

GEN_IMPL_INLINE s64 file_tell( FileInfo* f )
{
	s64 new_offset = 0;

	if ( ! f->ops.read_at )
		f->ops = default_file_operations;

	f->ops.seek( f->fd, 0, ESeekWhence_CURRENT, &new_offset );

	return new_offset;
}

GEN_IMPL_INLINE b32 file_read( FileInfo* f, void* buffer, sw size )
{
	s64 cur_offset = file_tell( f );
	b32 result     = file_read_at( f, buffer, size, file_tell( f ) );
	file_seek( f, cur_offset + size );
	return result;
}

GEN_IMPL_INLINE b32 file_read_at( FileInfo* f, void* buffer, sw size, s64 offset )
{
	return file_read_at_check( f, buffer, size, offset, NULL );
}

GEN_IMPL_INLINE b32 file_read_at_check( FileInfo* f, void* buffer, sw size, s64 offset, sw* bytes_read )
{
	if ( ! f->ops.read_at )
		f->ops = default_file_operations;
	return f->ops.read_at( f->fd, buffer, size, offset, bytes_read, false );
}

GEN_IMPL_INLINE b32 file_write( FileInfo* f, void const* buffer, sw size )
{
	s64 cur_offset = file_tell( f );
	b32 result     = file_write_at( f, buffer, size, file_tell( f ) );

	file_seek( f, cur_offset + size );

	return result;
}

GEN_IMPL_INLINE b32 file_write_at( FileInfo* f, void const* buffer, sw size, s64 offset )
{
	return file_write_at_check( f, buffer, size, offset, NULL );
}

GEN_IMPL_INLINE b32 file_write_at_check( FileInfo* f, void const* buffer, sw size, s64 offset, sw* bytes_written )
{
	if ( ! f->ops.read_at )
		f->ops = default_file_operations;

	return f->ops.write_at( f->fd, buffer, size, offset, bytes_written );
}

enum FileStreamFlags : u32
{
	/* Allows us to write to the buffer directly. Beware: you can not append a new data! */
	EFileStream_WRITABLE = bit( 0 ),

	/* Clones the input buffer so you can write (zpl_file_write*) data into it. */
	/* Since we work with a clone, the buffer size can dynamically grow as well. */
	EFileStream_CLONE_WRITABLE = bit( 1 ),
};

/**
 * Opens a new memory stream
 * @param file
 * @param allocator
 */
b8 file_stream_new( FileInfo* file, AllocatorInfo allocator );

/**
 * Opens a memory stream over an existing buffer
 * @param  file
 * @param  allocator
 * @param  buffer   Memory to create stream from
 * @param  size     Buffer's size
 * @param  flags
 */
b8 file_stream_open( FileInfo* file, AllocatorInfo allocator, u8* buffer, sw size, FileStreamFlags flags );

/**
 * Retrieves the stream's underlying buffer and buffer size.
 * @param file memory stream
 * @param size (Optional) buffer size
 */
u8* file_stream_buf( FileInfo* file, sw* size );

extern FileOperations const memory_file_operations;

#pragma endregion File Handling

#pragma region Timing

#ifdef GEN_BENCHMARK
//! Return CPU timestamp.
u64 read_cpu_time_stamp_counter( void );

//! Return relative time (in seconds) since the application start.
f64 time_rel( void );

//! Return relative time since the application start.
u64 time_rel_ms( void );
#endif

#pragma endregion Timing

GEN_NS_END

#ifdef __clang__
#pragma clang diagnostic pop
#endif

#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif