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specify offsets better

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Piper Merriam 2019-03-28 08:26:18 -06:00
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specs/simple-serialize.md
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@ -83,13 +83,21 @@ return b"\x01" if value is True else b"\x00"
The serialized representation of composite types is comprised of two binary sections. The serialized representation of composite types is comprised of two binary sections.
* The first section is *fixed size* for all types, containing the concatenation of * The first section is the concatenation of a mixture of either the serialized representation for *fixed size* elements **or** a serialized offset value for *variable size* elements.
- The serialized representation for each of the *fixed size* elements from the value - All *fixed size* elements are represented in this section as their serialized representation.
- The `"uint32"` serialized offset where the serialized representation of the *variable sized* elements from the value are located in the second section. - All *variable size* elements are represented in this section with a `"uint32"` serialized offset where the serialized representation of the element is located in the second section.
* The second section contains the concatenation of the serialized representations of **only** the *variable size* types. - offsets are relative to the beginning of the beginning of the entire serialized representation (the start of the first section)
* The second section is the concatenation of the serialized representations of **only** the *variable size* types.
- This section is empty in the case of a purely *fixed size* type. - This section is empty in the case of a purely *fixed size* type.
> **NOTE**: Offsets are relative to the beginning of the beginning of the entire serialized representation (the start of the first section)
Offset values are subject to the following validity rules:
- For Vector and Container types:
- The first offset **must** be equal to the length of the first section.
- For all types:
- Offsets **MAY NOT** be less than any previous offset.
- Offsets **MUST** be less than `2**32`
#### `"vector"`, `"container"` and `"list"` #### `"vector"`, `"container"` and `"list"`