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76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/* radare - LGPL - Copyright 2013-2015 - pancake */
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// XXX: should use the same code as libr/io/cache.c
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// one malloc per write
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#include <r_util.h>
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// TODO: optimize reallocs.. store RBuffer info.. wait. extend r_buf_ for that?
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R_API RCache *r_cache_new() {
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RCache *c = R_NEW (RCache);
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c->buf = NULL;
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c->base = 0;
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c->len = 0;
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return c;
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}
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R_API void r_cache_free(RCache *c) {
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free (c->buf);
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free (c);
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}
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R_API const ut8 *r_cache_get(RCache *c, ut64 addr, int *len) {
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if (!c->buf)
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return NULL;
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if (len) *len = c->base - addr;
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if (addr < c->base)
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return NULL;
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if (addr > (c->base + c->len))
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return NULL;
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if (len) *len = c->len - (addr - c->base);
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//eprintf ("4 - %d\n", (addr-c->base));
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return c->buf + (addr - c->base);
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}
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R_API int r_cache_set(RCache *c, ut64 addr, const ut8 *buf, int len) {
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if (c->buf == NULL) {
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c->buf = malloc (len);
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if (!c->buf) return 0;
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memcpy (c->buf, buf, len);
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c->base = addr;
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c->len = len;
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} else if (addr < c->base) {
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ut8 *b;
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int baselen = (c->base - addr);
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int newlen = baselen + ((len > c->len)? len: c->base);
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// XXX expensive heap usage. must simplify
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b = malloc (newlen);
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if (!b) return 0;
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memset (b, 0xff, newlen);
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memcpy (b + baselen, c->buf, c->len);
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memcpy (b, buf, len);
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free (c->buf);
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c->buf = b;
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c->base = addr;
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c->len = newlen;
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} else if ((addr + len) > (c->base + c->len)) {
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ut8 *b;
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int baselen = (addr - c->base);
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int newlen = baselen + len;
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b = realloc (c->buf, newlen);
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if (!b) return 0;
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memcpy (b + baselen, buf, len);
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c->buf = b;
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c->len = newlen;
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} else {
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memcpy (c->buf, buf, len);
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}
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return c->len;
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}
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R_API void r_cache_flush(RCache *c) {
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c->base = 0;
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c->len = 0;
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free (c->buf);
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c->buf = NULL;
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}
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