50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
#include "memory.h"
|
|
|
|
void memcpy(void *dest, const void *src, u32 size)
|
|
{
|
|
u8 *destc = (u8 *)dest;
|
|
const u8 *srcc = (const u8 *)src;
|
|
|
|
for(u32 i = 0; i < size; i++)
|
|
destc[i] = srcc[i];
|
|
}
|
|
|
|
int memcmp(const void *buf1, const void *buf2, u32 size)
|
|
{
|
|
const u8 *buf1c = (const u8 *)buf1;
|
|
const u8 *buf2c = (const u8 *)buf2;
|
|
|
|
for(u32 i = 0; i < size; i++)
|
|
{
|
|
int cmp = buf1c[i] - buf2c[i];
|
|
if(cmp) return cmp;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
//Quick Search algorithm, adapted from http://igm.univ-mlv.fr/~lecroq/string/node19.html#SECTION00190
|
|
u8 *memsearch(u8 *startPos, const void *pattern, u32 size, u32 patternSize)
|
|
{
|
|
const u8 *patternc = (const u8 *)pattern;
|
|
|
|
//Preprocessing
|
|
u32 table[256];
|
|
|
|
for(u32 i = 0; i < 256; i++)
|
|
table[i] = patternSize + 1;
|
|
for(u32 i = 0; i < patternSize; i++)
|
|
table[patternc[i]] = patternSize - i;
|
|
|
|
//Searching
|
|
u32 j = 0;
|
|
|
|
while(j <= size - patternSize)
|
|
{
|
|
if(memcmp(pattern, startPos + j, patternSize) == 0)
|
|
return startPos + j;
|
|
j += table[startPos[j + patternSize]];
|
|
}
|
|
|
|
return NULL;
|
|
} |