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LZB: add some notes for me

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JASON-6700K\jandersen 2020-07-13 16:41:19 -04:00
parent 0c5c466f64
commit e7198c6f4d
1 changed files with 9 additions and 5 deletions
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14
source/lzb.cpp
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@ -41,9 +41,13 @@ int LZB_Compress(unsigned char* pDest, unsigned char* pSource, int sourceSize)
unsigned char byte_data = pSource[ processedBytes++ ]; unsigned char byte_data = pSource[ processedBytes++ ];
candidate_data.push_back(byte_data); candidate_data.push_back(byte_data);
// If there's a match, then add to the candidate data, and see if
// there's a bigger match (use previous result to speed up search)
// (KMP is probably the last planned optmization here)
// The dictionary only contains bytes that have been emitted, so we // The dictionary only contains bytes that have been emitted, so we
// can't add this byte until we've emitted it? // can't add this byte until we've emitted it?
if (DictionaryMatch(candidate_data, bytesInDictionary) < 0) if (DictionaryMatch(candidate_data, bytesInDictionary) < 0)
{ {
// Was there a dictionary match // Was there a dictionary match
@ -279,10 +283,10 @@ static int EmitReference(unsigned char *pDest, int dictionaryOffset, std::vector
//------------------------------------------------------------------------------ //------------------------------------------------------------------------------
// //
// Std C memcpy seems to be stopping this from happening // Std C memcpy seems to be stopping the copy from happening, when I overlap
// probably for my protection // the buffer to get a pattern run copy (overlapped buffers)
// //
void mymemcpy(u8* pDest, u8* pSrc, int length) static void my_memcpy(u8* pDest, u8* pSrc, int length)
{ {
while (length-- > 0) while (length-- > 0)
{ {
@ -312,7 +316,7 @@ void LZB_Decompress(unsigned char* pDest, unsigned char* pSource, int destSize)
u16 offset = *pSource++; u16 offset = *pSource++;
offset |= ((u16)(*pSource++))<<8; offset |= ((u16)(*pSource++))<<8;
mymemcpy(&pDest[ decompressedBytes ], &pDest[ offset ], opcode); my_memcpy(&pDest[ decompressedBytes ], &pDest[ offset ], opcode);
decompressedBytes += opcode; decompressedBytes += opcode;
} }
else else