godot/thirdparty/enet/compress.c

/** 
 @file compress.c
 @brief An adaptive order-2 PPM range coder
*/
#define ENET_BUILDING_LIB …
#include <string.h>
#include "enet/enet.h"

ENetSymbol;

/* adaptation constants tuned aggressively for small packet sizes rather than large file compression */
enum
{ … };

/* context exclusion roughly halves compression speed, so disable for now */
#undef ENET_CONTEXT_EXCLUSION

ENetRangeCoder;

void *
enet_range_coder_create (void)
{ … }

void
enet_range_coder_destroy (void * context)
{ … }

#define ENET_SYMBOL_CREATE(symbol, value_, count_) …

#define ENET_CONTEXT_CREATE(context, escapes_, minimum) …

static enet_uint16
enet_symbol_rescale (ENetSymbol * symbol)
{ … }

#define ENET_CONTEXT_RESCALE(context, minimum) …

#define ENET_RANGE_CODER_OUTPUT(value) …

#define ENET_RANGE_CODER_ENCODE(under, count, total) …

#define ENET_RANGE_CODER_FLUSH …

#define ENET_RANGE_CODER_FREE_SYMBOLS …

#define ENET_CONTEXT_ENCODE(context, symbol_, value_, under_, count_, update, minimum) …

#ifdef ENET_CONTEXT_EXCLUSION
static const ENetSymbol emptyContext = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };

#define ENET_CONTEXT_WALK …

#define ENET_CONTEXT_ENCODE_EXCLUDE …
#endif

size_t
enet_range_coder_compress (void * context, const ENetBuffer * inBuffers, size_t inBufferCount, size_t inLimit, enet_uint8 * outData, size_t outLimit)
{ … }

#define ENET_RANGE_CODER_SEED …

#define ENET_RANGE_CODER_READ(total) …

#define ENET_RANGE_CODER_DECODE(under, count, total) …

#define ENET_CONTEXT_DECODE(context, symbol_, code, value_, under_, count_, update, minimum, createRoot, visitNode, createRight, createLeft) …

#define ENET_CONTEXT_TRY_DECODE(context, symbol_, code, value_, under_, count_, update, minimum, exclude) …

#define ENET_CONTEXT_ROOT_DECODE(context, symbol_, code, value_, under_, count_, update, minimum, exclude) … \

#ifdef ENET_CONTEXT_EXCLUSION
typedef struct _ENetExclude
{
    enet_uint8 value;
    enet_uint16 under;
} ENetExclude;

#define ENET_CONTEXT_DECODE_EXCLUDE …

#define ENET_CONTEXT_EXCLUDED …
#endif

#define ENET_CONTEXT_NOT_EXCLUDED(value_, after, before) …

size_t
enet_range_coder_decompress (void * context, const enet_uint8 * inData, size_t inLimit, enet_uint8 * outData, size_t outLimit)
{ … }

/** @defgroup host ENet host functions
    @{
*/

/** Sets the packet compressor the host should use to the default range coder.
    @param host host to enable the range coder for
    @returns 0 on success, < 0 on failure
*/
int
enet_host_compress_with_range_coder (ENetHost * host)
{ … }
    
/** @} */