mirror of
https://github.com/radareorg/radare2.git
synced 2024-12-11 23:16:05 +00:00
66f7403245
* Reimplement r_buf_fread/fwrite * Add slice buffer and introduce readonly field * Do nothing if size is 0 * Prevents an overflow when 8 is subtracted from size. * Fix ragg2 when patching outside currently existing buffer * Implement r_mem_mmap_resize for systems where mremap is not defined * r_buf_buffer can be called with no size arg as well * Use size_t instead of ut64
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#include <r_util.h>
|
|
|
|
struct buf_mmap_user {
|
|
const char *filename;
|
|
int perm;
|
|
};
|
|
|
|
// "subclass"" of buf_bytes_priv
|
|
struct buf_mmap_priv {
|
|
// NOTE: this needs to be first, so that bytes operations will work without changes
|
|
struct buf_bytes_priv bytes_priv;
|
|
RMmap *mmap;
|
|
};
|
|
|
|
static inline struct buf_mmap_priv *get_priv_mmap(RBuffer *b) {
|
|
struct buf_mmap_priv *priv = (struct buf_mmap_priv *)b->priv;
|
|
r_warn_if_fail (priv);
|
|
return priv;
|
|
}
|
|
|
|
static bool buf_mmap_init(RBuffer *b, const void *user) {
|
|
const struct buf_mmap_user *u = (const struct buf_mmap_user *)user;
|
|
struct buf_mmap_priv *priv = R_NEW0 (struct buf_mmap_priv);
|
|
if (!priv) {
|
|
return false;
|
|
}
|
|
|
|
priv->mmap = r_file_mmap (u->filename, u->perm & R_PERM_W, 0);
|
|
if (!priv->mmap) {
|
|
free (priv);
|
|
return false;
|
|
}
|
|
priv->bytes_priv.buf = priv->mmap->buf;
|
|
priv->bytes_priv.length = priv->mmap->len;
|
|
priv->bytes_priv.offset = 0;
|
|
b->priv = priv;
|
|
return true;
|
|
}
|
|
|
|
static bool buf_mmap_fini(RBuffer *b) {
|
|
struct buf_mmap_priv *priv = get_priv_mmap (b);
|
|
r_file_mmap_free (priv->mmap);
|
|
R_FREE (b->priv);
|
|
return true;
|
|
}
|
|
|
|
static bool buf_mmap_resize(RBuffer *b, ut64 newsize) {
|
|
struct buf_mmap_priv *priv = get_priv_mmap (b);
|
|
if (newsize > priv->mmap->len) {
|
|
ut8 *t = r_mem_mmap_resize (priv->mmap, newsize);
|
|
if (!t) {
|
|
return false;
|
|
}
|
|
priv->bytes_priv.buf = t;
|
|
}
|
|
priv->bytes_priv.length = newsize;
|
|
return true;
|
|
}
|
|
|
|
static const RBufferMethods buffer_mmap_methods = {
|
|
.init = buf_mmap_init,
|
|
.fini = buf_mmap_fini,
|
|
.read = buf_bytes_read,
|
|
.write = buf_bytes_write,
|
|
.get_size = buf_bytes_get_size,
|
|
.resize = buf_mmap_resize,
|
|
.seek = buf_bytes_seek,
|
|
};
|