// Copyright (c) Tailscale Inc & AUTHORS // SPDX-License-Identifier: BSD-3-Clause //go:build !plan9 package spdy import ( "bytes" "compress/zlib" "io" ) // zlibReader contains functionality to parse zlib compressed SPDY data. // See https://www.ietf.org/archive/id/draft-mbelshe-httpbis-spdy-00.txt section 2.6.10.1 type zlibReader struct { io.ReadCloser underlying io.LimitedReader // zlib compressed SPDY data } // Read decompresses zlibReader's underlying zlib compressed SPDY data and reads // it into b. func (z *zlibReader) Read(b []byte) (int, error) { if z.ReadCloser == nil { r, err := zlib.NewReaderDict(&z.underlying, spdyTxtDictionary) if err != nil { return 0, err } z.ReadCloser = r } return z.ReadCloser.Read(b) } // Set sets zlibReader's underlying data. b must be zlib compressed SPDY data. func (z *zlibReader) Set(b []byte) { z.underlying.R = bytes.NewReader(b) z.underlying.N = int64(len(b)) } // spdyTxtDictionary is the dictionary defined in the SPDY spec. // https://datatracker.ietf.org/doc/html/draft-mbelshe-httpbis-spdy-00#section-2.6.10.1 var spdyTxtDictionary = []byte{ 0x00, 0x00, 0x00, 0x07, 0x6f, 0x70, 0x74, 0x69, // - 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