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Consider endiannes when performing block write operations ##io (#14789)

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This commit is contained in:
Carles Pey 2019-08-18 03:53:07 +04:00 committed by radare
parent da079f22ea
commit a3d9bf170e
1 changed files with 39 additions and 1 deletions
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40
libr/core/cio.c
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@ -106,6 +106,38 @@ R_API bool r_core_dump(RCore *core, const char *file, ut64 addr, ut64 size, int
return true; return true;
} }
static bool __endian_swap(ut8 *buf, ut32 blocksize, ut8 len) {
ut32 i;
ut8 tmp;
ut16 v16;
ut32 v32;
ut64 v64;
if (len != 8 && len != 4 && len != 2 && len != 1) {
eprintf ("Invalid word size. Use 1, 2, 4 or 8\n");
return false;
}
if (len == 1) {
return true;
}
for (i = 0; i < blocksize; i += len) {
switch (len) {
case 8:
v64 = r_read_at_be64 (buf, i);
r_write_at_le64 (buf, v64, i);
break;
case 4:
v32 = r_read_at_be32 (buf, i);
r_write_at_le32 (buf, v32, i);
break;
case 2:
v16 = r_read_at_be16 (buf, i);
r_write_at_le16 (buf, v16, i);
break;
}
}
return true;
}
R_API int r_core_write_op(RCore *core, const char *arg, char op) { R_API int r_core_write_op(RCore *core, const char *arg, char op) {
int i, j, ret = false; int i, j, ret = false;
ut64 len; ut64 len;
@ -227,7 +259,13 @@ R_API int r_core_write_op(RCore *core, const char *arg, char op) {
} }
} }
} else { } else {
for (i=j=0; i<core->blocksize; i++) { bool be = r_config_get_i (core->config, "cfg.bigendian");
if (!be) {
if (!__endian_swap (str, len, len)) {
goto beach;
}
}
for (i = j = 0; i < core->blocksize; i++) {
switch (op) { switch (op) {
case 'x': buf[i] ^= str[j]; break; case 'x': buf[i] ^= str[j]; break;
case 'a': buf[i] += str[j]; break; case 'a': buf[i] += str[j]; break;