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- // Copyright 2016 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "net/filter/filter_source_stream_test_util.h"
- #include <cstring>
- #include "base/bit_cast.h"
- #include "base/check_op.h"
- #include "third_party/zlib/zlib.h"
- namespace net {
- // Compress |source| with length |source_len|. Write output into |dest|, and
- // output length into |dest_len|. If |gzip_framing| is true, header will be
- // added.
- void CompressGzip(const char* source,
- size_t source_len,
- char* dest,
- size_t* dest_len,
- bool gzip_framing) {
- size_t dest_left = *dest_len;
- z_stream zlib_stream;
- memset(&zlib_stream, 0, sizeof(zlib_stream));
- int code;
- if (gzip_framing) {
- const int kMemLevel = 8; // the default, see deflateInit2(3)
- code = deflateInit2(&zlib_stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
- -MAX_WBITS, kMemLevel, Z_DEFAULT_STRATEGY);
- } else {
- code = deflateInit(&zlib_stream, Z_DEFAULT_COMPRESSION);
- }
- DCHECK_EQ(Z_OK, code);
- // If compressing with gzip framing, prepend a gzip header. See RFC 1952 2.2
- // and 2.3 for more information.
- if (gzip_framing) {
- const unsigned char gzip_header[] = {
- 0x1f,
- 0x8b, // magic number
- 0x08, // CM 0x08 == "deflate"
- 0x00, // FLG 0x00 == nothing
- 0x00, 0x00, 0x00,
- 0x00, // MTIME 0x00000000 == no mtime
- 0x00, // XFL 0x00 == nothing
- 0xff, // OS 0xff == unknown
- };
- DCHECK_GE(dest_left, sizeof(gzip_header));
- memcpy(dest, gzip_header, sizeof(gzip_header));
- dest += sizeof(gzip_header);
- dest_left -= sizeof(gzip_header);
- }
- zlib_stream.next_in = base::bit_cast<Bytef*>(source);
- zlib_stream.avail_in = source_len;
- zlib_stream.next_out = base::bit_cast<Bytef*>(dest);
- zlib_stream.avail_out = dest_left;
- code = deflate(&zlib_stream, Z_FINISH);
- DCHECK_EQ(Z_STREAM_END, code);
- dest_left = zlib_stream.avail_out;
- deflateEnd(&zlib_stream);
- *dest_len -= dest_left;
- }
- } // namespace net
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