fn compress_file(
    prefix: &Path,
    path: &Path,
    map: &impl Fn(&AssetKey, &Path, &mut Vec<u8>, &mut CspHashes) -> Result<(), EmbeddedAssetsError>,
    csp_hashes: &mut CspHashes,
  ) -> Result<Asset, EmbeddedAssetsError> {
    let mut input = std::fs::read(path).map_err(|error| EmbeddedAssetsError::AssetRead {
      path: path.to_owned(),
      error,
    })?;

    // get a key to the asset path without the asset directory prefix
    let key = path
      .strip_prefix(prefix)
      .map(AssetKey::from) // format the path for use in assets
      .map_err(|_| EmbeddedAssetsError::PrefixInvalid {
        prefix: prefix.to_owned(),
        path: path.to_owned(),
      })?;

    // perform any caller-requested input manipulation
    map(&key, path, &mut input, csp_hashes)?;

    // we must canonicalize the base of our paths to allow long paths on windows
    let out_dir = std::env::var("OUT_DIR")
      .map_err(|_| EmbeddedAssetsError::OutDir)
      .map(PathBuf::from)
      .and_then(|p| p.canonicalize().map_err(|_| EmbeddedAssetsError::OutDir))
      .map(|p| p.join(TARGET_PATH))?;

    // make sure that our output directory is created
    std::fs::create_dir_all(&out_dir).map_err(|_| EmbeddedAssetsError::OutDir)?;

    // get a hash of the input - allows for caching existing files
    let hash = {
      let mut hasher = blake3::Hasher::new();
      if input.len() < MULTI_HASH_SIZE_LIMIT {
        hasher.update(&input);
      } else {
        hasher.update_rayon(&input);
      }
      hasher.finalize().to_hex()
    };

    // use the content hash to determine filename, keep extensions that exist
    let out_path = if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
      out_dir.join(format!("{}.{}", hash, ext))
    } else {
      out_dir.join(hash.to_string())
    };

    // only compress and write to the file if it doesn't already exist.
    if !out_path.exists() {
      #[allow(unused_mut)]
      let mut out_file =
        File::create(&out_path).map_err(|error| EmbeddedAssetsError::AssetWrite {
          path: out_path.clone(),
          error,
        })?;

      #[cfg(not(feature = "compression"))]
      {
        use std::io::Write;
        out_file
          .write_all(&input)
          .map_err(|error| EmbeddedAssetsError::AssetWrite {
            path: path.to_owned(),
            error,
          })?;
      }

      #[cfg(feature = "compression")]
      // entirely write input to the output file path with compression
      zstd::stream::copy_encode(&*input, out_file, Self::compression_level()).map_err(|error| {
        EmbeddedAssetsError::AssetWrite {
          path: path.to_owned(),
          error,
        }
      })?;
    }

    Ok((key, (path.into(), out_path)))
  }
/// Compress a file and spit out the information in a [`HashMap`] friendly form.
Compress a file and spit out the information in a [`HashMap`] friendly form.
Compress a file and spit out the information in a [ ` HashMap ` ] friendly form .
fn compress_file(
    prefix: &Path,
    path: &Path,
    map: &impl Fn(&AssetKey, &Path, &mut Vec<u8>, &mut CspHashes) -> Result<(), EmbeddedAssetsError>,
    csp_hashes: &mut CspHashes,
  ) -> Result<Asset, EmbeddedAssetsError> {
    let mut input = std::fs::read(path).map_err(|error| EmbeddedAssetsError::AssetRead {
      path: path.to_owned(),
      error,
    })?;
    // get a key to the asset path without the asset directory prefix
    let key = path
      .strip_prefix(prefix)
      .map(AssetKey::from) // format the path for use in assets
      .map_err(|_| EmbeddedAssetsError::PrefixInvalid {
        prefix: prefix.to_owned(),
        path: path.to_owned(),
      })?;
    // perform any caller-requested input manipulation
    map(&key, path, &mut input, csp_hashes)?;
    // we must canonicalize the base of our paths to allow long paths on windows
    let out_dir = std::env::var("OUT_DIR")
      .map_err(|_| EmbeddedAssetsError::OutDir)
      .map(PathBuf::from)
      .and_then(|p| p.canonicalize().map_err(|_| EmbeddedAssetsError::OutDir))
      .map(|p| p.join(TARGET_PATH))?;
    // make sure that our output directory is created
    std::fs::create_dir_all(&out_dir).map_err(|_| EmbeddedAssetsError::OutDir)?;
    // get a hash of the input - allows for caching existing files
    let hash = {
      let mut hasher = blake3::Hasher::new();
      if input.len() < MULTI_HASH_SIZE_LIMIT {
        hasher.update(&input);
      } else {
        hasher.update_rayon(&input);
      }
      hasher.finalize().to_hex()
    };
    // use the content hash to determine filename, keep extensions that exist
    let out_path = if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
      out_dir.join(format!("{}.{}", hash, ext))
    } else {
      out_dir.join(hash.to_string())
    };
    // only compress and write to the file if it doesn't already exist.
    if !out_path.exists() {
      #[allow(unused_mut)]
      let mut out_file =
        File::create(&out_path).map_err(|error| EmbeddedAssetsError::AssetWrite {
          path: out_path.clone(),
          error,
        })?;
      #[cfg(not(feature = "compression"))]
      {
        use std::io::Write;
        out_file
          .write_all(&input)
          .map_err(|error| EmbeddedAssetsError::AssetWrite {
            path: path.to_owned(),
            error,
          })?;
      }
      #[cfg(feature = "compression")]
      // entirely write input to the output file path with compression
      zstd::stream::copy_encode(&*input, out_file, Self::compression_level()).map_err(|error| {
        EmbeddedAssetsError::AssetWrite {
          path: path.to_owned(),
          error,
        }
      })?;
    }
    Ok((key, (path.into(), out_path)))
  }
fn compress_file ( prefix : & Path , path : & Path , map : & impl Fn ( & AssetKey , & Path , & mut Vec < u8 > , & mut CspHashes ) -> Result < ( ) , EmbeddedAssetsError > , csp_hashes : & mut CspHashes , ) -> Result < Asset , EmbeddedAssetsError > { let mut input = std :: fs :: read ( path ) . map_err ( | error | EmbeddedAssetsError :: AssetRead { path : path . to_owned ( ) , error , } ) ? ; // get a key to the asset path without the asset directory prefix let key = path . strip_prefix ( prefix ) . map ( AssetKey :: from ) // format the path for use in assets . map_err ( | _ | EmbeddedAssetsError :: PrefixInvalid { prefix : prefix . to_owned ( ) , path : path . to_owned ( ) , } ) ? ; // perform any caller-requested input manipulation map ( & key , path , & mut input , csp_hashes ) ? ; // we must canonicalize the base of our paths to allow long paths on windows let out_dir = std :: env :: var ( " " ) . map_err ( | _ | EmbeddedAssetsError :: OutDir ) . map ( PathBuf :: from ) . and_then ( | p | p . canonicalize ( ) . map_err ( | _ | EmbeddedAssetsError :: OutDir ) ) . map ( | p | p . join ( TARGET_PATH ) ) ? ; // make sure that our output directory is created std :: fs :: create_dir_all ( & out_dir ) . map_err ( | _ | EmbeddedAssetsError :: OutDir ) ? ; // get a hash of the input - allows for caching existing files let hash = { let mut hasher = blake3 :: Hasher :: new ( ) ; if input . len ( ) < MULTI_HASH_SIZE_LIMIT { hasher . update ( & input ) ; } else { hasher . update_rayon ( & input ) ; } hasher . finalize ( ) . to_hex ( ) } ; // use the content hash to determine filename, keep extensions that exist let out_path = if let Some ( ext ) = path . extension ( ) . and_then ( | e | e . to_str ( ) ) { out_dir . join ( format ! ( " " hash ext ) ) } else { out_dir . join ( hash . to_string ( ) ) } ; // only compress and write to the file if it doesn't already exist. if ! out_path . exists ( ) { # [ allow ( unused_mut ) ] let mut out_file = File :: create ( & out_path ) . map_err ( | error | EmbeddedAssetsError :: AssetWrite { path : out_path . clone ( ) , error , } ) ? ; # [ cfg ( not ( feature " " ) ) ] { use std :: io :: Write ; out_file . write_all ( & input ) . map_err ( | error | EmbeddedAssetsError :: AssetWrite { path : path . to_owned ( ) , error , } ) ? ; } # [ cfg ( feature " " ) ] // entirely write input to the output file path with compression zstd :: stream :: copy_encode ( & * input , out_file , Self :: compression_level ( ) ) . map_err ( | error | { EmbeddedAssetsError :: AssetWrite { path : path . to_owned ( ) , error , } } ) ? ; } Ok ( ( key , ( path . into ( ) , out_path ) ) ) }
Compress a file and spit out the information in a [`HashMap`] friendly form.
Compress a file and spit out the information in a [ ` HashMap ` ] friendly form .
prefix
&Path
path
&Path
map
&impl Fn(&AssetKey, &Path, &mut Vec<u8>, &mut CspHashes) -> Result<(), EmbeddedAssetsError>
csp_hashes
&mut CspHashes
prefix
&Path
path
&Path
map
&impl Fn(&AssetKey, &Path, &mut Vec<u8>, &mut CspHashes) -> Result<(), EmbeddedAssetsError>
csp_hashes
&mut CspHashes