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