Merge pull request #522 from qdm12/qdm12/host-runtime/u32-to-i32

Change `offset` parameter from `u32` to `i32`

ab_host-api/child_storage.adoc

@@ -51,7 +51,7 @@ the number of bytes that the entry in storage has beyond the offset.
 ----
 (func $ext_default_child_storage_read_version_1
 	(param $child_storage_key i64) (param $key i64) (param $value_out i64)
-	(param $offset u32) (result i64))
+	(param $offset i32) (result i64))
 ----
 
 Arguments::
@@ -62,7 +62,7 @@ child storage key (<<defn-child-storage-type>>).
 * `value_out`: a pointer-size (<<defn-runtime-pointer-size>>) to the buffer
 to which the value will be written to. This function will never write more then
 the length of the buffer, even if the value’s length is bigger.
-* `offset`: an u32 integer containing the offset beyond the value should be read
+* `offset`: an u32 integer (typed as i32 due to wasm types) containing the offset beyond the value should be read
 from.
 * `result`: a pointer-size (<<defn-runtime-pointer-size>>) to the SCALE
 encoded _Option_ value (<<defn-option-type>>) containing the number of bytes

ab_host-api/storage.adoc

@@ -57,15 +57,15 @@ offset.
 ===== Version 1 - Prototype
 ----
 (func $ext_storage_read_version_1
-	(param $key i64) (param $value_out i64) (param $offset u32) (result i64))
+	(param $key i64) (param $value_out i64) (param $offset i32) (result i64))
 ----
 
 Arguments::
 * `key`: a pointer-size (<<defn-runtime-pointer-size>>) containing the key.
 * `value_out`: a pointer-size (<<defn-runtime-pointer-size>>) containing the
 buffer to which the value will be written to. This function will never write
 more then the length of the buffer, even if the value’s length is bigger.
-* `offset`: an u32 integer containing the offset beyond the value should be read
+* `offset`: an u32 integer (typed as i32 due to wasm types) containing the offset beyond the value should be read
 from.
 * `result`: a pointer-size (<<defn-runtime-pointer-size>>) pointing to a SCALE
 encoded _Option_ value (<<defn-option-type>>) containing an unsigned 32-bit