//! Minimal bindings for the pinned zlib dependency.
//!
//! Zig 0.17 removed `@cImport`. Keeping the small ABI surface used by
//! `deflate.zig` here avoids running translate-c over all of zlib.h on every
//! clean build.

pub const uInt = c_uint;
pub const uLong = c_ulong;
pub const Bytef = u8;
pub const voidpf = ?*anyopaque;

pub const alloc_func = ?*const fn (
    @"opaque": voidpf,
    items: uInt,
    size: uInt,
) callconv(.c) voidpf;

pub const free_func = ?*const fn (
    @"opaque": voidpf,
    address: voidpf,
) callconv(.c) void;

const internal_state = opaque {};

pub const z_stream = extern struct {
    next_in: [*c]Bytef,
    avail_in: uInt,
    total_in: uLong,
    next_out: [*c]Bytef,
    avail_out: uInt,
    total_out: uLong,
    msg: [*c]u8,
    state: ?*internal_state,
    zalloc: alloc_func,
    zfree: free_func,
    @"opaque": voidpf,
    data_type: c_int,
    adler: uLong,
    reserved: uLong,
};

pub const Z_NO_FLUSH: c_int = 0;
pub const Z_SYNC_FLUSH: c_int = 2;
pub const Z_OK: c_int = 0;
pub const Z_BUF_ERROR: c_int = -5;
pub const Z_DEFAULT_COMPRESSION: c_int = -1;
pub const Z_DEFAULT_STRATEGY: c_int = 0;
pub const Z_DEFLATED: c_int = 8;
pub const MAX_WBITS: c_int = 15;

const ZLIB_VERSION: [*:0]const u8 = "1.3.2";

pub fn deflateInit2(
    stream: *z_stream,
    level: c_int,
    method: c_int,
    window_bits: c_int,
    mem_level: c_int,
    strategy: c_int,
) c_int {
    return deflateInit2_(
        stream,
        level,
        method,
        window_bits,
        mem_level,
        strategy,
        ZLIB_VERSION,
        @sizeOf(z_stream),
    );
}

pub fn inflateInit2(stream: *z_stream, window_bits: c_int) c_int {
    return inflateInit2_(stream, window_bits, ZLIB_VERSION, @sizeOf(z_stream));
}

extern fn deflateInit2_(
    stream: *z_stream,
    level: c_int,
    method: c_int,
    window_bits: c_int,
    mem_level: c_int,
    strategy: c_int,
    version: [*:0]const u8,
    stream_size: c_int,
) c_int;

extern fn inflateInit2_(
    stream: *z_stream,
    window_bits: c_int,
    version: [*:0]const u8,
    stream_size: c_int,
) c_int;

pub extern fn deflate(stream: *z_stream, flush: c_int) c_int;
pub extern fn deflateEnd(stream: *z_stream) c_int;
pub extern fn deflateReset(stream: *z_stream) c_int;
pub extern fn inflate(stream: *z_stream, flush: c_int) c_int;
pub extern fn inflateEnd(stream: *z_stream) c_int;
pub extern fn inflateReset(stream: *z_stream) c_int;