#include <stdlib.h>
#include <UDPTCPNetwork.h>
#include "inmemoryfile.h"

InMemoryFile::InMemoryFile() {
    mem = malloc (INMEMORYFILE_ALLOCATEBLOCK);
    memallocsize = INMEMORYFILE_ALLOCATEBLOCK;
    memsize = 0;
};

InMemoryFile::~InMemoryFile() {
    if (mem != NULL) free (mem);
    mem = NULL;
    memallocsize = 0;
    memsize = 0;
};


int InMemoryFile::Allocate(size_t newsize) {
    // shrink size only if new memory block is smaller then 25%
    if ((newsize < memallocsize / 4) || (newsize > memallocsize)) {
        memallocsize = (1+(newsize/INMEMORYFILE_ALLOCATEBLOCK))*INMEMORYFILE_ALLOCATEBLOCK;
        memsize = newsize;
        mem = realloc(mem, memallocsize);
        if (mem == NULL || memsize > memallocsize) {
            debug ("could not reallocate memory  memsize:%d memallocsize:%d\n.", memsize, memallocsize);
            exit (1);
        }
    }
    return 1;
};


InMemoryFile InMemoryFile::operator=(InMemoryFile rightside) {
    memsize = rightside.memsize;
    memallocsize = 1+(memsize/INMEMORYFILE_ALLOCATEBLOCK)*INMEMORYFILE_ALLOCATEBLOCK;
    mem = realloc(mem, memallocsize+1);
    if (mem == NULL || memsize > memallocsize) {
        debug ("could not reallocate memory: %s\n.", strerror(errno));
        exit (1);
    }
    memcpy (mem, rightside.mem, memsize);

    return *this;
};


/// @brief copy the memory.
/// @param srcptr pointer to the source memory
/// @param srcsize size of the memory
/// @return 1 on success, 0 on error
int InMemoryFile::CopyFrom(void *srcptr, size_t srcsize) {
    if (Allocate (srcsize) == 0) return 0;
    memcpy (mem, srcptr, memsize);
    return 1;
}