size_t
enet_range_coder_compress (void * context, const ENetBuffer * inBuffers, size_t inBufferCount, size_t inLimit, enet_uint8 * outData, size_t outLimit)
{
ENetRangeCoder * rangeCoder = (ENetRangeCoder *) context;
enet_uint8 * outStart = outData, * outEnd = & outData [outLimit];
const enet_uint8 * inData, * inEnd;
enet_uint32 encodeLow = 0, encodeRange = ~0;
ENetSymbol * root;
enet_uint16 predicted = 0;
size_t order = 0, nextSymbol = 0;
if (rangeCoder == NULL || inBufferCount <= 0 || inLimit <= 0)
return 0;
inData = (const enet_uint8 *) inBuffers -> data;
inEnd = & inData [inBuffers -> dataLength];
inBuffers ++;
inBufferCount --;
ENET_CONTEXT_CREATE (root, ENET_CONTEXT_ESCAPE_MINIMUM, ENET_CONTEXT_SYMBOL_MINIMUM);
for (;;)
{
ENetSymbol * subcontext, * symbol;
#ifdef ENET_CONTEXT_EXCLUSION
const ENetSymbol * childContext = & emptyContext;
#endif
enet_uint8 value;
enet_uint16 count, under, * parent = & predicted, total;
if (inData >= inEnd)
{
if (inBufferCount <= 0)
break;
inData = (const enet_uint8 *) inBuffers -> data;
inEnd = & inData [inBuffers -> dataLength];
inBuffers ++;
inBufferCount --;
}
value = * inData ++;
for (subcontext = & rangeCoder -> symbols [predicted];
subcontext != root;
#ifdef ENET_CONTEXT_EXCLUSION
childContext = subcontext,
#endif
subcontext = & rangeCoder -> symbols [subcontext -> parent])
{
ENET_CONTEXT_ENCODE (subcontext, symbol, value, under, count, ENET_SUBCONTEXT_SYMBOL_DELTA, 0);
* parent = symbol - rangeCoder -> symbols;
parent = & symbol -> parent;
total = subcontext -> total;
#ifdef ENET_CONTEXT_EXCLUSION
if (childContext -> total > ENET_SUBCONTEXT_SYMBOL_DELTA + ENET_SUBCONTEXT_ESCAPE_DELTA)
ENET_CONTEXT_ENCODE_EXCLUDE (childContext, value, under, total, 0);
#endif
if (count > 0)
{
ENET_RANGE_CODER_ENCODE (subcontext -> escapes + under, count, total);
}
else
{
if (subcontext -> escapes > 0 && subcontext -> escapes < total)
ENET_RANGE_CODER_ENCODE (0, subcontext -> escapes, total);
subcontext -> escapes += ENET_SUBCONTEXT_ESCAPE_DELTA;
subcontext -> total += ENET_SUBCONTEXT_ESCAPE_DELTA;
}
subcontext -> total += ENET_SUBCONTEXT_SYMBOL_DELTA;
if (count > 0xFF - 2*ENET_SUBCONTEXT_SYMBOL_DELTA || subcontext -> total > ENET_RANGE_CODER_BOTTOM - 0x100)
ENET_CONTEXT_RESCALE (subcontext, 0);
if (count > 0) goto nextInput;
}
ENET_CONTEXT_ENCODE (root, symbol, value, under, count, ENET_CONTEXT_SYMBOL_DELTA, ENET_CONTEXT_SYMBOL_MINIMUM);
* parent = symbol - rangeCoder -> symbols;
parent = & symbol -> parent;
total = root -> total;
#ifdef ENET_CONTEXT_EXCLUSION
if (childContext -> total > ENET_SUBCONTEXT_SYMBOL_DELTA + ENET_SUBCONTEXT_ESCAPE_DELTA)
ENET_CONTEXT_ENCODE_EXCLUDE (childContext, value, under, total, ENET_CONTEXT_SYMBOL_MINIMUM);
#endif
ENET_RANGE_CODER_ENCODE (root -> escapes + under, count, total);
root -> total += ENET_CONTEXT_SYMBOL_DELTA;
if (count > 0xFF - 2*ENET_CONTEXT_SYMBOL_DELTA + ENET_CONTEXT_SYMBOL_MINIMUM || root -> total > ENET_RANGE_CODER_BOTTOM - 0x100)
ENET_CONTEXT_RESCALE (root, ENET_CONTEXT_SYMBOL_MINIMUM);
nextInput:
if (order >= ENET_SUBCONTEXT_ORDER)
predicted = rangeCoder -> symbols [predicted].parent;
else
order ++;
ENET_RANGE_CODER_FREE_SYMBOLS;
}
ENET_RANGE_CODER_FLUSH;
return (size_t) (outData - outStart);
}
size_t
enet_range_coder_compress (void * context, const ENetBuffer * inBuffers, size_t inBufferCount, size_t inLimit, enet_uint8 * outData, size_t outLimit)
{
#ifdef _DEBUG
//Seth - just some debug stuff to see how much this compresion was really doing.. not bad!
// char stCrap[256];
// int inBuff = inLimit;
#endif
ENetRangeCoder * rangeCoder = (ENetRangeCoder *) context;
enet_uint8 * outStart = outData, * outEnd = & outData [outLimit];
const enet_uint8 * inData, * inEnd;
enet_uint32 encodeLow = 0, encodeRange = ~0;
ENetSymbol * root;
enet_uint16 predicted = 0;
size_t order = 0, nextSymbol = 0;
if (rangeCoder == NULL || inBufferCount <= 0 || inLimit <= 0)
return 0;
inData = (const enet_uint8 *) inBuffers -> data;
inEnd = & inData [inBuffers -> dataLength];
inBuffers ++;
inBufferCount --;
ENET_CONTEXT_CREATE (root, ENET_CONTEXT_ESCAPE_MINIMUM, ENET_CONTEXT_SYMBOL_MINIMUM);
for (;;)
{
ENetSymbol * subcontext, * symbol;
#ifdef ENET_CONTEXT_EXCLUSION
const ENetSymbol * childContext = & emptyContext;
#endif
enet_uint8 value;
enet_uint16 count, under, * parent = & predicted, total;
if (inData >= inEnd)
{
if (inBufferCount <= 0)
break;
inData = (const enet_uint8 *) inBuffers -> data;
inEnd = & inData [inBuffers -> dataLength];
inBuffers ++;
inBufferCount --;
}
value = * inData ++;
for (subcontext = & rangeCoder -> symbols [predicted];
subcontext != root;
#ifdef ENET_CONTEXT_EXCLUSION
childContext = subcontext,
#endif
subcontext = & rangeCoder -> symbols [subcontext -> parent])
{
ENET_CONTEXT_ENCODE (subcontext, symbol, value, under, count, ENET_SUBCONTEXT_SYMBOL_DELTA, 0);
* parent = symbol - rangeCoder -> symbols;
parent = & symbol -> parent;
total = subcontext -> total;
#ifdef ENET_CONTEXT_EXCLUSION
if (childContext -> total > ENET_SUBCONTEXT_SYMBOL_DELTA + ENET_SUBCONTEXT_ESCAPE_DELTA)
ENET_CONTEXT_ENCODE_EXCLUDE (childContext, value, under, total, 0);
#endif
if (count > 0)
{
ENET_RANGE_CODER_ENCODE (subcontext -> escapes + under, count, total);
}
else
{
if (subcontext -> escapes > 0 && subcontext -> escapes < total)
ENET_RANGE_CODER_ENCODE (0, subcontext -> escapes, total);
subcontext -> escapes += ENET_SUBCONTEXT_ESCAPE_DELTA;
subcontext -> total += ENET_SUBCONTEXT_ESCAPE_DELTA;
}
subcontext -> total += ENET_SUBCONTEXT_SYMBOL_DELTA;
if (count > 0xFF - 2*ENET_SUBCONTEXT_SYMBOL_DELTA || subcontext -> total > ENET_RANGE_CODER_BOTTOM - 0x100)
ENET_CONTEXT_RESCALE (subcontext, 0);
if (count > 0) goto nextInput;
}
ENET_CONTEXT_ENCODE (root, symbol, value, under, count, ENET_CONTEXT_SYMBOL_DELTA, ENET_CONTEXT_SYMBOL_MINIMUM);
* parent = symbol - rangeCoder -> symbols;
parent = & symbol -> parent;
total = root -> total;
#ifdef ENET_CONTEXT_EXCLUSION
if (childContext -> total > ENET_SUBCONTEXT_SYMBOL_DELTA + ENET_SUBCONTEXT_ESCAPE_DELTA)
ENET_CONTEXT_ENCODE_EXCLUDE (childContext, value, under, total, ENET_CONTEXT_SYMBOL_MINIMUM);
#endif
ENET_RANGE_CODER_ENCODE (root -> escapes + under, count, total);
root -> total += ENET_CONTEXT_SYMBOL_DELTA;
if (count > 0xFF - 2*ENET_CONTEXT_SYMBOL_DELTA + ENET_CONTEXT_SYMBOL_MINIMUM || root -> total > ENET_RANGE_CODER_BOTTOM - 0x100)
ENET_CONTEXT_RESCALE (root, ENET_CONTEXT_SYMBOL_MINIMUM);
nextInput:
if (order >= ENET_SUBCONTEXT_ORDER)
predicted = rangeCoder -> symbols [predicted].parent;
else
order ++;
ENET_RANGE_CODER_FREE_SYMBOLS;
}
ENET_RANGE_CODER_FLUSH;
#ifdef _DEBUG
// sprintf(stCrap, "in buffer count %d, compressed to %d\r\n", inBuff, (outData - outStart));
// OutputDebugString(stCrap);
#endif
g_enetTotalBytesSentDecompressed += inLimit;
g_enetTotalBytesSent += outData - outStart;
return (size_t) (outData - outStart);
}