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#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "memblock.h"
unsigned memblock_count = 0, memblock_total = 0;
struct memblock *memblock_new(size_t length) {
struct memblock *b = malloc(sizeof(struct memblock)+length);
b->type = MEMBLOCK_APPENDED;
b->ref = 1;
b->length = length;
b->data = b+1;
memblock_count++;
memblock_total += length;
return b;
}
struct memblock *memblock_new_fixed(void *d, size_t length) {
struct memblock *b = malloc(sizeof(struct memblock));
b->type = MEMBLOCK_FIXED;
b->ref = 1;
b->length = length;
b->data = d;
memblock_count++;
memblock_total += length;
return b;
}
struct memblock *memblock_new_dynamic(void *d, size_t length) {
struct memblock *b = malloc(sizeof(struct memblock));
b->type = MEMBLOCK_DYNAMIC;
b->ref = 1;
b->length = length;
b->data = d;
memblock_count++;
memblock_total += length;
return b;
}
struct memblock* memblock_ref(struct memblock*b) {
assert(b && b->ref >= 1);
b->ref++;
return b;
}
void memblock_unref(struct memblock*b) {
assert(b && b->ref >= 1);
b->ref--;
if (b->ref == 0) {
if (b->type == MEMBLOCK_DYNAMIC)
free(b->data);
memblock_count--;
memblock_total -= b->length;
free(b);
}
}
void memblock_unref_fixed(struct memblock *b) {
void *d;
assert(b && b->ref >= 1);
if (b->ref == 1) {
memblock_unref(b);
return;
}
d = malloc(b->length);
assert(d);
memcpy(d, b->data, b->length);
b->data = d;
b->type = MEMBLOCK_DYNAMIC;
}
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