Bedrock Edition level format/v0.1.0 alpha

This is the specification for the level format in Pocket Edition v0.1.0 alpha up to Pocket Edition v0.2.0 alpha where the format was changed to NBT instead of raw binary.

level.dat

Data	Length (Bytes)	Description
Header	8	A little-endian 32 bit integer used to identify the version of the tool used to save the file, always 1 followed by a little-endian 32 bit integer that marks the size of the file subtract the header.
Seed	4	A big-endian 32 bit signed integer
Spawn X	4	A big-endian 32 bit signed integer
Spawn Y	4	A big-endian 32 bit signed integer
Spawn Z	4	A big-endian 32 bit signed integer
Estimated world size	8	A big-endian 64 bit integer representing the world size in bits
Last Played	4	A big-endian 32 bit unix timestamp indicating when the level was last saved, will overflow and become negative at 03:14:08 UTC on 19 January 2038 due to the year 2038 problem and will overflow every ~136 years after that.
Length of World Name in Bytes	2	A big-endian unsigned 16 bit integer
World Name	Variable	A CP437 encoded string

player.dat

Data	Length (Bytes)	Description
Header	8	A little-endian 32 bit integer used to identify the version of the tool used to save the file, always 1 followed by a little-endian 32 bit integer that marks the size of the file subtract the header, always 80.
Pos X	4	A little-endian 32 bit float
Pos Y	4	A little-endian 32 bit float
Pos Z	4	A little-endian 32 bit float
Motion X	4	A little-endian 32 bit float
Motion Y	4	A little-endian 32 bit float
Motion Z	4	A little-endian 32 bit float
Pitch	4	A little-endian 32 bit float, an error in the code causes this value to be read incorrectly
Yaw	4	A little-endian 32 bit float representing the player's yaw in degrees
Unknown	4	A little-endian 32 bit float
Fire	2	A little-endian signed short representing the number of ticks until the fire is put out. Negative values reflect how long the player can stand in fire before burning. Default value: -20
Air	2	A little-endian signed short representing how much air the player has, in ticks. Fills to a maximum of 300 in air. Decreases while underwater.
Unknown	4
Hotbar	36	9 slots that take up 4 bytes each, the first two bytes is the item ID. The other two bytes have unknown use and are always 0x00. The last slot is always saved as 0xFF for every byte, it's known to be a hotbar slot as the minecraftpe library loops through 9 hotbar slots.