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upd data
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@ -11,9 +11,13 @@ use anyhow::Result;
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use crate::{block::Block, chunk::{CHUNK_SIZE, BlockDataRef}};
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const SECTOR_SIZE: usize = CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE * size_of::<Block>();
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const RESERVED_SIZE: usize = 524288; //512kb (16 sectors assuming 32x32x32 world of 1byte blocks)
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const RESERVED_SIZE: usize = 1048576; //~1mb (16 sectors assuming 32x32x32 world of 1byte blocks)
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const RESERVED_SECTOR_COUNT: usize = RESERVED_SIZE / SECTOR_SIZE;
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//magic = "KUBI" + IDENTITY (4 bytes)
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const HEADER_MAGIC_SIZE: usize = 8;
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const HEADER_MAGIC_STR: [u8; 4] = *b"KUBI";
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const HEADER_MAGIC_IDENTITY: u32 = 1;
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// #[repr(transparent)]
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// struct IVec2Hash(IVec2);
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@ -22,7 +26,7 @@ struct WorldSaveDataHeader {
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pub name: Cow<'static, str>,
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pub seed: u64,
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sector_count: u32,
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chunk_map: HashMap<IVec2, u32>
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chunk_map: HashMap<IVec2, u32>,
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}
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impl Default for WorldSaveDataHeader {
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@ -51,13 +55,29 @@ impl WorldSaveFile {
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fn read_header(&mut self) -> Result<()> {
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self.file.rewind()?;
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self.header = bincode::deserialize_from((&self.file).take(RESERVED_SIZE as u64))?;
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let mut subheader = [0u8; HEADER_MAGIC_SIZE];
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self.file.read_exact(&mut subheader)?;
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if subheader[0..4] != HEADER_MAGIC_STR {
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return Err(anyhow::anyhow!("invalid file header"));
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}
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if subheader[4..8] != HEADER_MAGIC_IDENTITY.to_be_bytes() {
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return Err(anyhow::anyhow!("this save file cannot be loaded by this version of the game"));
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}
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let limit = (RESERVED_SIZE - HEADER_MAGIC_SIZE) as u64;
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self.header = bincode::deserialize_from((&self.file).take(limit))?;
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Ok(())
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}
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fn write_header(&mut self) -> Result<()> {
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self.file.rewind()?;
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///XXX: this can cause the header to destroy chunk data (if it's WAY too long)
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self.file.write_all(&HEADER_MAGIC_STR)?;
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self.file.write_all(&HEADER_MAGIC_IDENTITY.to_be_bytes())?;
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//XXX: this can cause the header to destroy chunk data (if it's WAY too long)
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// read has checks against this, but write doesn't
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// 1mb is pretty generous tho, so it's not a *big* deal
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bincode::serialize_into(&self.file, &self.header)?;
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Ok(())
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}
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