diff options
Diffstat (limited to 'dbus/dbus-marshal.c')
| -rw-r--r-- | dbus/dbus-marshal.c | 249 |
1 files changed, 204 insertions, 45 deletions
diff --git a/dbus/dbus-marshal.c b/dbus/dbus-marshal.c index 5d7290e3..cb989891 100644 --- a/dbus/dbus-marshal.c +++ b/dbus/dbus-marshal.c @@ -73,13 +73,17 @@ swap_bytes (unsigned char *data, } #endif /* !DBUS_HAVE_INT64 */ +/** + * Union used to manipulate 8 bytes as if they + * were various types. + */ typedef union { #ifdef DBUS_HAVE_INT64 - dbus_int64_t s; - dbus_uint64_t u; + dbus_int64_t s; /**< 64-bit integer */ + dbus_uint64_t u; /**< 64-bit unsinged integer */ #endif - double d; + double d; /**< double */ } DBusOctets8; static DBusOctets8 @@ -98,7 +102,8 @@ unpack_8_octets (int byte_order, r.u = DBUS_UINT64_FROM_BE (*(dbus_uint64_t*)data); #else r.d = *(double*)data; - swap_bytes (&r, sizeof (r)); + if (byte_order != DBUS_COMPILER_BYTE_ORDER) + swap_bytes ((unsigned char*) &r, sizeof (r)); #endif return r; @@ -390,6 +395,10 @@ _dbus_marshal_set_uint64 (DBusString *str, * an existing string or the wrong length will be deleted * and replaced with the new string. * + * Note: no attempt is made by this function to re-align + * any data which has been already marshalled after this + * string. Use with caution. + * * @param str the string to write the marshalled string to * @param offset the byte offset where string should be written * @param byte_order the byte order to use @@ -423,6 +432,30 @@ _dbus_marshal_set_string (DBusString *str, return TRUE; } +/** + * Sets the existing marshaled object path at the given offset to a new + * value. The given offset must point to an existing object path or this + * function doesn't make sense. + * + * @todo implement this function + * + * @param str the string to write the marshalled path to + * @param offset the byte offset where path should be written + * @param byte_order the byte order to use + * @param path the new path + * @param path_len number of elements in the path + */ +void +_dbus_marshal_set_object_path (DBusString *str, + int byte_order, + int offset, + const char **path, + int path_len) +{ + + /* FIXME */ +} + static dbus_bool_t marshal_4_octets (DBusString *str, int byte_order, @@ -682,7 +715,7 @@ marshal_8_octets_array (DBusString *str, #ifdef DBUS_HAVE_INT64 *((dbus_uint64_t*)d) = DBUS_UINT64_SWAP_LE_BE (*((dbus_uint64_t*)d)); #else - swap_bytes (d, 8); + swap_bytes ((unsigned char*) d, 8); #endif d += 8; } @@ -844,6 +877,58 @@ _dbus_marshal_string_array (DBusString *str, return FALSE; } +/** + * Marshals an object path value. + * + * @param str the string to append the marshalled value to + * @param byte_order the byte order to use + * @param path the path + * @param path_len length of the path + * @returns #TRUE on success + */ +dbus_bool_t +_dbus_marshal_object_path (DBusString *str, + int byte_order, + const char **path, + int path_len) +{ + int array_start, old_string_len; + int i; + + old_string_len = _dbus_string_get_length (str); + + /* Set the length to 0 temporarily */ + if (!_dbus_marshal_uint32 (str, byte_order, 0)) + goto nomem; + + array_start = _dbus_string_get_length (str); + + i = 0; + while (i < path_len) + { + if (!_dbus_string_append_byte (str, '/')) + goto nomem; + + if (!_dbus_string_append (str, path[0])) + goto nomem; + + ++i; + } + + /* Write the length now that we know it */ + _dbus_marshal_set_uint32 (str, byte_order, + _DBUS_ALIGN_VALUE (old_string_len, sizeof(dbus_uint32_t)), + _dbus_string_get_length (str) - array_start); + + return TRUE; + + nomem: + /* Restore the previous length */ + _dbus_string_set_length (str, old_string_len); + + return FALSE; +} + static dbus_uint32_t demarshal_4_octets (const DBusString *str, int byte_order, @@ -1174,7 +1259,7 @@ demarshal_8_octets_array (const DBusString *str, #ifdef DBUS_HAVE_INT64 retval[i].u = DBUS_UINT64_SWAP_LE_BE (retval[i].u); #else - swap_bytes (&retval[i], 8); + swap_bytes ((unsigned char *) &retval[i], 8); #endif } } @@ -1393,6 +1478,105 @@ _dbus_demarshal_string_array (const DBusString *str, return FALSE; } +/** Set to 1 to get a bunch of spew about disassembling the path string */ +#define VERBOSE_DECOMPOSE 0 + +/** + * Demarshals an object path. A path of just "/" is + * represented as an empty vector of strings. + * + * @param str the string containing the data + * @param byte_order the byte order + * @param pos the position in the string + * @param new_pos the new position of the string + * @param path address to store new object path + * @param path_len length of stored path + */ +dbus_bool_t +_dbus_demarshal_object_path (const DBusString *str, + int byte_order, + int pos, + int *new_pos, + char ***path, + int *path_len) +{ + int len; + char **retval; + const char *data; + int n_components; + int i, j, comp; + + len = _dbus_demarshal_uint32 (str, byte_order, pos, &pos); + data = _dbus_string_get_const_data_len (str, pos, len + 1); + _dbus_assert (data != NULL); + +#if VERBOSE_DECOMPOSE + _dbus_verbose ("Decomposing path \"%s\"\n", + data); +#endif + + n_components = 0; + i = 0; + while (i < len) + { + if (data[i] == '/') + n_components += 1; + ++i; + } + + retval = dbus_new0 (char*, n_components + 1); + + if (retval == NULL) + return FALSE; + + comp = 0; + i = 0; + while (i < len) + { + if (data[i] == '/') + ++i; + j = i; + + while (j < len && data[j] != '/') + ++j; + + /* Now [i, j) is the path component */ + _dbus_assert (i < j); + _dbus_assert (data[i] != '/'); + _dbus_assert (j == len || data[j] == '/'); + +#if VERBOSE_DECOMPOSE + _dbus_verbose (" (component in [%d,%d))\n", + i, j); +#endif + + retval[comp] = _dbus_memdup (&data[i], j - i + 1); + if (retval[comp] == NULL) + { + dbus_free_string_array (retval); + return FALSE; + } + retval[comp][j-i] = '\0'; +#if VERBOSE_DECOMPOSE + _dbus_verbose (" (component %d = \"%s\")\n", + comp, retval[comp]); +#endif + + ++comp; + i = j; + } + _dbus_assert (i == len); + + *path = retval; + if (path_len) + *path_len = n_components; + + if (new_pos) + *new_pos = pos + len + 1; + + return TRUE; +} + /** * Returns the position right after the end of an argument. PERFORMS * NO VALIDATION WHATSOEVER. The message must have been previously @@ -1435,32 +1619,18 @@ _dbus_marshal_get_arg_end_pos (const DBusString *str, break; case DBUS_TYPE_INT32: - *end_pos = _DBUS_ALIGN_VALUE (pos, sizeof (dbus_int32_t)) + sizeof (dbus_int32_t); - - break; - case DBUS_TYPE_UINT32: - *end_pos = _DBUS_ALIGN_VALUE (pos, sizeof (dbus_uint32_t)) + sizeof (dbus_uint32_t); - + *end_pos = _DBUS_ALIGN_VALUE (pos, 4) + 4; break; -#ifdef DBUS_HAVE_INT64 case DBUS_TYPE_INT64: - *end_pos = _DBUS_ALIGN_VALUE (pos, sizeof (dbus_int64_t)) + sizeof (dbus_int64_t); - - break; - case DBUS_TYPE_UINT64: - *end_pos = _DBUS_ALIGN_VALUE (pos, sizeof (dbus_uint64_t)) + sizeof (dbus_uint64_t); - - break; -#endif /* DBUS_HAVE_INT64 */ - case DBUS_TYPE_DOUBLE: - *end_pos = _DBUS_ALIGN_VALUE (pos, sizeof (double)) + sizeof (double); - + + *end_pos = _DBUS_ALIGN_VALUE (pos, 8) + 8; break; + case DBUS_TYPE_OBJECT_PATH: case DBUS_TYPE_STRING: { int len; @@ -1664,6 +1834,7 @@ validate_array_data (const DBusString *str, case DBUS_TYPE_NIL: break; + case DBUS_TYPE_OBJECT_PATH: case DBUS_TYPE_STRING: case DBUS_TYPE_NAMED: case DBUS_TYPE_ARRAY: @@ -1744,10 +1915,6 @@ validate_array_data (const DBusString *str, * returns #TRUE if a valid arg begins at "pos" * * @todo security: need to audit this function. - * - * @todo For array types that can't be invalid, we should not - * walk the whole array validating it. e.g. just skip all the - * int values in an int array. * * @param str a string * @param byte_order the byte order to use @@ -1842,21 +2009,7 @@ _dbus_marshal_validate_arg (const DBusString *str, break; case DBUS_TYPE_INT64: - case DBUS_TYPE_UINT64: - { - int align_8 = _DBUS_ALIGN_VALUE (pos, 8); - - if (!_dbus_string_validate_nul (str, pos, - align_8 - pos)) - { - _dbus_verbose ("int64/uint64 alignment padding not initialized to nul\n"); - return FALSE; - } - - *end_pos = align_8 + 8; - } - break; - + case DBUS_TYPE_UINT64: case DBUS_TYPE_DOUBLE: { int align_8 = _DBUS_ALIGN_VALUE (pos, 8); @@ -1866,7 +2019,7 @@ _dbus_marshal_validate_arg (const DBusString *str, if (!_dbus_string_validate_nul (str, pos, align_8 - pos)) { - _dbus_verbose ("double alignment padding not initialized to nul\n"); + _dbus_verbose ("double/int64/uint64/objid alignment padding not initialized to nul\n"); return FALSE; } @@ -1874,6 +2027,7 @@ _dbus_marshal_validate_arg (const DBusString *str, } break; + case DBUS_TYPE_OBJECT_PATH: case DBUS_TYPE_STRING: { int len; @@ -1887,6 +2041,12 @@ _dbus_marshal_validate_arg (const DBusString *str, if (!validate_string (str, pos, len, end_pos)) return FALSE; + + if (type == DBUS_TYPE_OBJECT_PATH) + { + if (!_dbus_string_validate_path (str, pos, len)) + return FALSE; + } } break; @@ -2478,7 +2638,6 @@ _dbus_marshal_test (void) s = _dbus_demarshal_string (&str, DBUS_BIG_ENDIAN, 0, NULL); _dbus_assert (strcmp (s, "Hello") == 0); dbus_free (s); - _dbus_string_free (&str); |