Make MetricsService upload logs through an interface.

chrome/browser/metrics/compression_utils.cc

Index: chrome/browser/metrics/compression_utils.cc
===================================================================
--- chrome/browser/metrics/compression_utils.cc	(revision 274045)
+++ chrome/browser/metrics/compression_utils.cc	(working copy)
@@ -1,92 +0,0 @@
-// Copyright 2013 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 "chrome/browser/metrics/compression_utils.h"
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "third_party/zlib/zlib.h"
-
-namespace {
-
-// The difference in bytes between a zlib header and a gzip header.
-const size_t kGzipZlibHeaderDifferenceBytes = 16;
-
-// Pass an integer greater than the following get a gzip header instead of a
-// zlib header when calling deflateInit2_.
-const int kWindowBitsToGetGzipHeader = 16;
-
-// This describes the amount of memory zlib uses to compress data. It can go
-// from 1 to 9, with 8 being the default. For details, see:
-// http://www.zlib.net/manual.html (search for memLevel).
-const int kZlibMemoryLevel = 8;
-
-// This code is taken almost verbatim from third_party/zlib/compress.c. The only
-// difference is deflateInit2_ is called which sets the window bits to be > 16.
-// That causes a gzip header to be emitted rather than a zlib header.
-int GzipCompressHelper(Bytef* dest,
-                       uLongf* dest_length,
-                       const Bytef* source,
-                       uLong source_length) {
-    z_stream stream;
-
-    stream.next_in = bit_cast<Bytef*>(source);
-    stream.avail_in = static_cast<uInt>(source_length);
-    stream.next_out = dest;
-    stream.avail_out = static_cast<uInt>(*dest_length);
-    if (static_cast<uLong>(stream.avail_out) != *dest_length)
-      return Z_BUF_ERROR;
-
-    stream.zalloc = static_cast<alloc_func>(0);
-    stream.zfree = static_cast<free_func>(0);
-    stream.opaque = static_cast<voidpf>(0);
-
-    gz_header gzip_header;
-    memset(&gzip_header, 0, sizeof(gzip_header));
-    int err = deflateInit2_(&stream,
-                            Z_DEFAULT_COMPRESSION,
-                            Z_DEFLATED,
-                            MAX_WBITS + kWindowBitsToGetGzipHeader,
-                            kZlibMemoryLevel,
-                            Z_DEFAULT_STRATEGY,
-                            ZLIB_VERSION,
-                            sizeof(z_stream));
-    if (err != Z_OK)
-      return err;
-
-    err = deflateSetHeader(&stream, &gzip_header);
-    if (err != Z_OK)
-      return err;
-
-    err = deflate(&stream, Z_FINISH);
-    if (err != Z_STREAM_END) {
-        deflateEnd(&stream);
-        return err == Z_OK ? Z_BUF_ERROR : err;
-    }
-    *dest_length = stream.total_out;
-
-    err = deflateEnd(&stream);
-    return err;
-}
-}  // namespace
-
-namespace chrome {
-
-bool GzipCompress(const std::string& input, std::string* output) {
-  std::vector<Bytef> compressed_data(kGzipZlibHeaderDifferenceBytes +
-                                     compressBound(input.size()));
-
-  uLongf compressed_size = compressed_data.size();
-  if (GzipCompressHelper(&compressed_data.front(),
-                         &compressed_size,
-                         bit_cast<const Bytef*>(input.data()),
-                         input.size()) != Z_OK)
-    return false;
-
-  compressed_data.resize(compressed_size);
-  output->assign(compressed_data.begin(), compressed_data.end());
-  return true;
-}
-}  // namespace chrome