Minecraft:Bedrock Edition level format/v0.1.0 alpha

This is the specification for the level format in Minecraft:Pocket Edition v0.1.0 alpha up to Minecraft: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 bitsTemplate:Verify
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<ref group="note">This is due to the font texture found in the assets folder of the apk, future versions may render non-ASCII characters differently</ref>

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
Fall Distance	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.Template:Verify
On GroundTemplate:Verify	1	A byte, with 0 meaning the player is not on the ground and 1 meaning they are.
Unknown	3	The first two bytes of this unknown data have actual data in them, so this is not unused.
Hotbar	36	9 slots that take up 4 bytes each, the first two bytes is the item ID<ref group="note">Every items from Pocket Edition 0.1.0 to 0.1.3 has an ID only takes up 1 byte with the exception of Minecraft:Camera, which takes 2 bytes (c8 01).</ref>. 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.