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Document ZSTD_WINDOW_BUFFER_SIZE

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Richard Feldman 2025-08-15 12:17:04 -04:00
parent 27c008e099
commit 7da886baaa
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12
src/unbundle/unbundle.zig
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@ -12,6 +12,13 @@ const base58 = @import("base58");
const TAR_EXTENSION = ".tar.zst";
const STREAM_BUFFER_SIZE: usize = 64 * 1024; // 64KB buffer for streaming operations
/// Size of the decompression window buffer for zstd.
/// 8MB (2^23 bytes) is the default and recommended size for zstd decompression.
/// This matches zstd's default maximum window size, allowing us to decompress
/// any standard zstd stream. Smaller buffers would fail on streams compressed
/// with larger window sizes.
const ZSTD_WINDOW_BUFFER_SIZE: usize = 1 << 23; // 8MB
/// Errors that can occur during the unbundle operation.
pub const UnbundleError = error{
DecompressionFailed,
@ -290,7 +297,10 @@ pub fn unbundleStream(
};
// Create zstandard decompressor
var zstd_stream = std.compress.zstd.decompressor(hashing_reader.reader(), .{});
var window_buffer: [ZSTD_WINDOW_BUFFER_SIZE]u8 = undefined;
var zstd_stream = std.compress.zstd.decompressor(hashing_reader.reader(), .{
.window_buffer = &window_buffer,
});
const decompressed_reader = zstd_stream.reader();
// Create tar reader