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fix(format): cap a compressed file's JSON at 256 MB on wasm32 (#3587)

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MAX_JSON was 1 GiB on every target, but on wasm32 the 4 GiB address space
also holds the document the JSON deserializes into, several times its size.
The cap is now a quarter of the native one there, mirroring MAX_BLOBS,
and Unpacked::within makes the cap exercisable wherever a test runs.

Co-authored-by: rahul05ranjan <11793455+rahul05ranjan@users.noreply.github.com>
This commit is contained in:
Rahul
2026-10-27 14:32:54 +07:00
committed by bflatastic
co-authored by rahul05ranjan
parent eb0e99a553
commit 10dfb8b261
1 changed files with 4 additions and 2 deletions
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crates/format/src/lib.rs
+4 -2
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@@ -66,8 +66,10 @@ pub const EXTENSION: &str = "vectorcraft";
pub const LEGACY_EXTENSION: &str = "drawcraft";
/// Most bytes the JSON of a compressed file may unpack to (a guard against decompression bombs,
/// as are [`MAX_BLOB`] and [`MAX_BLOBS`]). A compressed save refuses a document past any of them,
/// so every file VectorCraft writes reads back.
pub const MAX_JSON: u64 = 1 << 30;
/// so every file VectorCraft writes reads back. On wasm32 the cap is a quarter of the native
/// one: the JSON is deserialized into a document several times its size, and the 4 GiB address
/// space also holds the file, the JSON, the document and the app (#3587).
pub const MAX_JSON: u64 = if cfg!(target_arch = "wasm32") { 256 << 20 } else { 1 << 30 };
/// Most bytes one entry of the data after the JSON (an image, a placed document, the PDF, a
/// profile) may have in a compressed file.
pub const MAX_BLOB: u64 = 1 << 30;