Par2z — Development skill for Claude Code

par2z

[](https://garnix.io/repo/pmarreck/par2z) [](https://github.com/pmarreck/par2z/actions/workflows/ci.yml)

Overview

Cleanroom PAR2 implementation with a Zig core, C ABI for FFI (Swift/LuaJIT), and a standalone CLI.

API Layers

• High-level recovery/verification API in src/core/api.zig.
• Block-level API in src/core/block_api.zig for slice-by-slice workflows and custom storage backends.
• Storage adapters in src/core/storage.zig (memory-backed and file-backed) so recovery can run without loading whole files up front.
• CLI operations moved into src/ops.zig (callable from Zig and suitable for C/Swift wrappers). src/cli.zig is now a thin CLI parser + I/O shim.

C API Examples

The C ABI is declared in `include/par2.h`. Memory and stream inputs do not touch disk.

Thread pool configuration (optional): the library uses a global thread pool by default. You can configure the global pool size or supply your own pool handle via the C ABI. Handles are independent and safe to run concurrently. The only shared global state is the thread pool configuration, so set or swap pools before starting work and avoid changing it while operations are active.

Create from memory (no temp files), write `.par2` to a path:

#include "par2.h"

const uint8_t data[] = {0,1,2,3,4,5,6,7};
Par2CreateHandle *create = NULL;
par2_create_new(NULL, &create);
par2_create_add_memory(create, "data.bin", data, sizeof(data));
par2_create_set_output_path(create, "set.par2");
par2_create_run(create);
par2_create_destroy(create);

// optional: configure global pool size (0 = default)
par2_thread_pool_configure(0);

Verify from in-memory PAR2 bytes and a stream input:

#include "par2.h"

struct MemCtx { const uint8_t *data; size_t len; };
static size_t read_at(void *ctx, uint64_t off, uint8_t *o