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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// deno-lint-ignore-file
// https://github.com/nodeca/pako/blob/master/lib/zlib/constants.js
export const Z_NO_FLUSH = 0;
export const Z_PARTIAL_FLUSH = 1;
export const Z_SYNC_FLUSH = 2;
export const Z_FULL_FLUSH = 3;
export const Z_FINISH = 4;
export const Z_BLOCK = 5;
export const Z_TREES = 6;
export const Z_OK = 0;
export const Z_STREAM_END = 1;
export const Z_NEED_DICT = 2;
export const Z_ERRNO = -1;
export const Z_STREAM_ERROR = -2;
export const Z_DATA_ERROR = -3;
export const Z_MEM_ERROR = -4;
export const Z_BUF_ERROR = -5;
export const Z_VERSION_ERROR = -6;
export const Z_NO_COMPRESSION = 0;
export const Z_BEST_SPEED = 1;
export const Z_BEST_COMPRESSION = 9;
export const Z_DEFAULT_COMPRESSION = -1;
export const Z_FILTERED = 1;
export const Z_HUFFMAN_ONLY = 2;
export const Z_RLE = 3;
export const Z_FIXED = 4;
export const Z_DEFAULT_STRATEGY = 0;
export const Z_BINARY = 0;
export const Z_TEXT = 1;
export const Z_UNKNOWN = 2;
export const Z_DEFLATED = 8;
// zlib modes
export const NONE = 0;
export const DEFLATE = 1;
export const INFLATE = 2;
export const GZIP = 3;
export const GUNZIP = 4;
export const DEFLATERAW = 5;
export const INFLATERAW = 6;
export const UNZIP = 7;
import {
op_zlib_close,
op_zlib_close_if_pending,
op_zlib_init,
op_zlib_new,
op_zlib_reset,
op_zlib_write,
} from "ext:core/ops";
import process from "node:process";
const writeResult = new Uint32Array(2);
class Zlib {
#handle;
constructor(mode) {
this.#handle = op_zlib_new(mode);
}
close() {
op_zlib_close(this.#handle);
}
writeSync(
flush,
input,
in_off,
in_len,
out,
out_off,
out_len,
) {
const err = op_zlib_write(
this.#handle,
flush,
input,
in_off,
in_len,
out,
out_off,
out_len,
writeResult,
);
if (this.#checkError(err)) {
return [writeResult[1], writeResult[0]];
}
return;
}
#checkError(err) {
// Acceptable error states depend on the type of zlib stream.
switch (err) {
case Z_BUF_ERROR:
this.#error("unexpected end of file", err);
return false;
case Z_OK:
case Z_STREAM_END:
// normal statuses, not fatal
break;
case Z_NEED_DICT:
this.#error("Bad dictionary", err);
return false;
default:
// something else.
this.#error("Zlib error", err);
return false;
}
return true;
}
write(
flush,
input,
in_off,
in_len,
out,
out_off,
out_len,
) {
process.nextTick(() => {
const res = this.writeSync(
flush ?? Z_NO_FLUSH,
input,
in_off,
in_len,
out,
out_off,
out_len,
);
if (res) {
const [availOut, availIn] = res;
this.callback(availOut, availIn);
}
});
return this;
}
init(
windowBits,
level,
memLevel,
strategy,
dictionary,
) {
const err = op_zlib_init(
this.#handle,
level,
windowBits,
memLevel,
strategy,
dictionary ?? new Uint8Array(0),
);
if (err != Z_OK) {
this.#error("Failed to initialize zlib", err);
}
}
params() {
throw new Error("deflateParams Not supported");
}
reset() {
const err = op_zlib_reset(this.#handle);
if (err != Z_OK) {
this.#error("Failed to reset stream", err);
}
}
#error(message, err) {
this.onerror(message, err);
op_zlib_close_if_pending(this.#handle);
}
}
export { Zlib };
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