Minecraft Legacy Save Files
Orginial Repositoryopen in new window
The following Table gives you Important information the structure of a Save file:
| Name | Size (in bytes) | Description |
|---|
| Offset(Int) | 0x04 | offset of File information |
| NumberOfFiles(Int) | 0x04 | Number of Files in list of File Info |
| Filedata | variable | bytes of each file contained inside the save |
| FileInfo | variable | Filenames, offsets within save, and size in bytes of files. |
| Name | Size (in bytes) | Description |
|---|
| Filename | 0x80 | Endian reverse Unicode string to dictate the path of the file |
| Filesize(Int) | 0x04 | Size of file in bytes |
| Offset(Int) | 0x04 | offset of file |
MCR Structure
The following Table gives you Important information the structure of a legacy edition mcr file:
| Name | Size (in bytes) | Description |
|---|
| locations | 0x1000 | offsets of the chunks within the region file, as well as X,Y positioning |
| timestamps | 0x1000 | timestamps for the chunks found within the previous sector |
| chunks and unused space | variable | chunks themselves, compressed with a different format per-console. |
LCE buffers
| Platform | SAVEGAME | REGION | CHUNK/GRF |
|---|
| Xbox360 | XMemcompress | None | XMemcompress (+ RLE) |
| PS3 | Deflate(Algorithm)open in new window or None | None | Deflate(Algorithm) (+ RLE) |
| WiiU | Zlib | None | Zlib (+ RLE) |
| PSVita | Vita RLE | None | Zlib (+ RLE) |
| Switch | Zlib | Switch RLE | Zlib (+ RLE) |
Chunk Structure
The chunks on LCE utilize a different format to Java's MCR Chunks, this is the header information:
| Name | Size (in bytes) | Description |
|---|
| FlagAndBuffer | 0x04 | Bit flag for RLE and an unknown value, plus 30 bits to specify the compressed buffer size |
| RLEUncompressedBuffer(Int) | 0x04 | Size of the buffer after RLE is performed |
| UncompressedBuffer(Int) | 0x04 | Size of the buffer before RLE is performed(only occurs on PS3) |
| Format | 0x02 | chunk format version (0xC is aquatic) |
| X(Int) | 0x04 | chunk X coordinate |
| Y(Int) | 0x04 | chunk X coordinate |
| LastUpdate | 0x08 | chunk Last-Updated Time |
| Inhabited | 0x08 | chunk Inhabited Time(Only on chunk version 8 and higher) |
Within the chunk header lies a 4-byte portion of data that dictates 2 flags and the compressed chunk size.
| Name | Size (in bits) | Description |
|---|
| RLE Flag | 1 | Flag for if to use RLE |
| Unknown Flag | 1 | It is unknown what this flag is |
| CompressedSize | 30 | compressed chunk size |
