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How to load and save binary data
antix
Member
I am having trouble getting a binary file to save and load. I am trying to do the following..
1. encode a table to a json string
2. compress the string with zlib
3. save the result to device
4. reload the saved data
5. decompress it back into a json string
6. decode it back into a table
The issue seems to be in the saving and loading of the file. In my example the compressed string is 143 bytes in size. When it is saved and reloaded it's size is only 5 bytes. Does anyone know how I can actually save the entire compressed data and reload it again?
1. encode a table to a json string
2. compress the string with zlib
3. save the result to device
4. reload the saved data
5. decompress it back into a json string
6. decode it back into a table
The issue seems to be in the saving and loading of the file. In my example the compressed string is 143 bytes in size. When it is saved and reloaded it's size is only 5 bytes. Does anyone know how I can actually save the entire compressed data and reload it again?
require("json") local file, blob, comp, data data = { version = "1.1", luaversion = "5.1", tiledversion = "1.0.2", orientation = "orthogonal", renderorder = "left-down", width = 100, height = 50, tilewidth = 16, tileheight = 16, nextobjectid = 188, properties = {}, tilesets = {} } blob = json.encode(data) -- encode table comp = zlib.compress(blob, 9, 8, 15, 9, 0) -- compress json string print("#datasize before write", #comp) file = io.open("|D|data", "wb") -- write binary file file:write(comp) file:close() file = nil file = io.open("|D|data", "rb") -- read binary file comp = file:read() file:close() file = nil print("#datasize after read", #comp) --blob = zlib.decompress(comp, 15) -- recreate json string --data = json.decode(json_blob2) -- recreate table |
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