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Updated Persister (.world etc.) format (markdown)

Sgeo 2017-06-12 22:34:31 -04:00
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Persister-(.world-etc.)-format.md

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Data in Persister format does not mark itself to indicate their types, the types are assumed by the deserialization code. That is, a Portal being read in knows when to expect a boolean, a string, and an integer, for example. Without knowing what a Portal wants to read, it is not possible to determine where the next item begins. Data in Persister format does not mark itself to indicate their types, the types are assumed by the deserialization code. That is, a Portal being read in knows when to expect a boolean, a string, and an integer, for example. Without knowing what a Portal wants to read, it is not possible to determine where the next item begins.
During reading or writing, WorldsPlayer maintains 3 tables: Object table, Class table, Cookie table (for versions). These serve as a caching mechanism,
# Primitive data types # Primitive data types
Worlds generally uses the format described by [Java's DataInput](https://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html). Worlds generally uses the format described by [Java's DataInput](https://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html).
* String: Starts with a byte, where 0x01 means the string is null (and the next byte is for the next item) and 0x00 means non-null. If non-null, next 2 bytes are the length in number of bytes (big-endian). Following is the actual string data, in modified UTF-8. (The bytes after the non-null indicator are merely read by DataInput). * String: Starts with a byte, where 0x01 means the string is null (and the next byte is for the next item) and 0x00 means non-null. If non-null, next 2 bytes are the length in number of bytes (big-endian). Following is the actual string data, in modified UTF-8. (The bytes after the non-null indicator are merely read by DataInput).
* Boolean: 1 byte, 0x00 for false 0x01 for true. * Boolean: 1 byte, 0x00 for false 0x01 for true.
* Byte, Double, Long, Int, Float, Short: Self-explanatory
# Objects
Obj