radare2/libr/io/ioutils.c

75 lines
2.2 KiB
C

/* radare - LGPL - Copyright 2017-2022 - condret, pancake */
#include <r_io.h>
//This helper function only check if the given vaddr is mapped, it does not account
//for map perms
R_API bool r_io_addr_is_mapped(RIO *io, ut64 vaddr) {
r_return_val_if_fail (io, false);
return (io->va && r_io_map_get_at (io, vaddr));
}
// when io.va is true this checks if the highest priorized map at this
// offset has the same or high permissions set. When there is no map it
// check for the current desc permissions and size.
// when io.va is false it only checks for the desc
R_API bool r_io_is_valid_offset(RIO* io, ut64 offset, int hasperm) {
r_return_val_if_fail (io, false);
if (io->cached) {
ut8 word[4] = { 0xff, 0xff, 0xff, 0xff};
(void) r_io_read_at (io, offset, (ut8*)&word, 4);
if (!r_io_cache_read (io, offset, (ut8*)&word, 4)) {
if (!r_io_read_at (io, offset, (ut8*)&word, 4)) {
return false;
}
}
if (!memcmp (word, "\xff\xff\xff\xff", 4)) {
return false;
}
return true;
}
if (io->mask) {
if (offset > io->mask && hasperm & R_PERM_X) {
return false;
}
}
if (io->va) {
if (!hasperm) {
// return r_io_map_is_mapped (io, offset);
RIOMap* map = r_io_map_get_at (io, offset);
return map? map->perm & R_PERM_R: false;
}
RIOMap* map = r_io_map_get_at (io, offset);
return map? (map->perm & hasperm) == hasperm: false;
}
if (!io->desc) {
return false;
}
if (offset > r_io_desc_size (io->desc)) {
return false;
}
return ((io->desc->perm & hasperm) == hasperm);
}
// this is wrong, there is more than big and little endian
R_API bool r_io_read_i(RIO* io, ut64 addr, ut64 *val, int size, bool endian) {
ut8 buf[8];
r_return_val_if_fail (io && val, false);
size = R_DIM (size, 1, 8);
if (!r_io_read_at (io, addr, buf, size)) {
return false;
}
//size says the number of bytes to read transform to bits for r_read_ble
*val = r_read_ble (buf, endian, size * 8);
return true;
}
R_API bool r_io_write_i(RIO* io, ut64 addr, ut64 *val, int size, bool endian) {
ut8 buf[8];
r_return_val_if_fail (io && val, false);
size = R_DIM (size, 1, 8);
//size says the number of bytes to read transform to bits for r_read_ble
r_write_ble (buf, *val, endian, size * 8);
return r_io_write_at (io, addr, buf, size) == size;
}