amxmodx/compiler/libpc300/memfile.c
2006-07-16 02:25:32 +00:00

106 lines
1.7 KiB
C

#include "memfile.h"
#include <string.h>
#include "osdefs.h"
memfile_t *memfile_creat(const char *name, size_t init)
{
memfile_t mf;
memfile_t *pmf;
mf.size = init;
mf.base = (char *)malloc(init);
mf.usedoffs = 0;
if (!mf.base)
{
return NULL;
}
mf.offs = 0;
mf._static = 0;
pmf = (memfile_t *)malloc(sizeof(memfile_t));
memcpy(pmf, &mf, sizeof(memfile_t));
pmf->name = strdup(name);
return pmf;
}
void memfile_destroy(memfile_t *mf)
{
if (!mf->_static)
{
free(mf->name);
free(mf->base);
free(mf);
}
}
void memfile_seek(memfile_t *mf, long seek)
{
mf->offs = seek;
}
long memfile_tell(memfile_t *mf)
{
return mf->offs;
}
size_t memfile_read(memfile_t *mf, void *buffer, size_t maxsize)
{
if (!maxsize || mf->offs >= mf->usedoffs)
{
return 0;
}
if (mf->usedoffs - mf->offs < (long)maxsize)
{
maxsize = mf->usedoffs - mf->offs;
if (!maxsize)
{
return 0;
}
}
memcpy(buffer, mf->base + mf->offs, maxsize);
mf->offs += maxsize;
return maxsize;
}
int memfile_write(memfile_t *mf, void *buffer, size_t size)
{
if (mf->offs + size > mf->size)
{
size_t newsize = (mf->size + size) * 2;
if (mf->_static)
{
char *oldbase = mf->base;
mf->base = (char *)malloc(newsize);
if (!mf->base)
{
return 0;
}
memcpy(mf->base, oldbase, mf->size);
} else {
mf->base = (char *)realloc(mf->base, newsize);
if (!mf->base)
{
return 0;
}
}
mf->_static = 0;
mf->size = newsize;
}
memcpy(mf->base + mf->offs, buffer, size);
mf->offs += size;
if (mf->offs > mf->usedoffs)
{
mf->usedoffs = mf->offs;
}
return 1;
}