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#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) |
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{ |
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return; |
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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, const 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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void memfile_reset(memfile_t *mf) |
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{ |
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mf->usedoffs = 0; |
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mf->offs = 0; |
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} |
