Update Crashpad to 4a2043ea65e2641ef1a921801c0aaa15ada02fc7

third_party/crashpad/crashpad/util/net/http_body_gzip_test.cc

+// Copyright 2017 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/net/http_body_gzip.h"
+
+#include <string.h>
+
+#include <algorithm>
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "base/macros.h"
+#include "base/rand_util.h"
+#include "base/numerics/safe_conversions.h"
+#include "gtest/gtest.h"
+#include "third_party/zlib/zlib_crashpad.h"
+#include "util/misc/zlib.h"
+#include "util/net/http_body.h"
+
+namespace crashpad {
+namespace test {
+namespace {
+
+class ScopedZlibInflateStream {
+ public:
+  explicit ScopedZlibInflateStream(z_stream* zlib) : zlib_(zlib) {}
+  ~ScopedZlibInflateStream() {
+    int zr = inflateEnd(zlib_);
+    EXPECT_EQ(Z_OK, zr) << "inflateEnd: " << ZlibErrorString(zr);
+  }
+
+ private:
+  z_stream* zlib_;  // weak
+  DISALLOW_COPY_AND_ASSIGN(ScopedZlibInflateStream);
+};
+
+void GzipInflate(const std::string& compressed,
+                 std::string* decompressed,
+                 size_t buf_size) {
+  decompressed->clear();
+
+  // There’s got to be at least a small buffer.
+  buf_size = std::max(buf_size, static_cast<size_t>(1));
+
+  std::unique_ptr<uint8_t[]> buf(new uint8_t[buf_size]);
+  z_stream zlib = {};
+  zlib.zalloc = Z_NULL;
+  zlib.zfree = Z_NULL;
+  zlib.opaque = Z_NULL;
+  zlib.next_in = reinterpret_cast<Bytef*>(const_cast<char*>(&compressed[0]));
+  zlib.avail_in = base::checked_cast<uInt>(compressed.size());
+  zlib.next_out = buf.get();
+  zlib.avail_out = base::checked_cast<uInt>(buf_size);
+
+  int zr = inflateInit2(&zlib, ZlibWindowBitsWithGzipWrapper(0));
+  ASSERT_EQ(Z_OK, zr) << "inflateInit2: " << ZlibErrorString(zr);
+  ScopedZlibInflateStream zlib_inflate(&zlib);
+
+  zr = inflate(&zlib, Z_FINISH);
+  ASSERT_EQ(Z_STREAM_END, zr) << "inflate: " << ZlibErrorString(zr);
+
+  ASSERT_LE(zlib.avail_out, buf_size);
+  decompressed->assign(reinterpret_cast<char*>(buf.get()),
+                       buf_size - zlib.avail_out);
+}
+
+void TestGzipDeflateInflate(const std::string& string) {
+  std::unique_ptr<HTTPBodyStream> string_stream(
+      new StringHTTPBodyStream(string));
+  GzipHTTPBodyStream gzip_stream(std::move(string_stream));
+
+  // The minimum size of a gzip wrapper per RFC 1952: a 10-byte header and an
+  // 8-byte trailer.
+  const size_t kGzipHeaderSize = 18;
+
+  // Per http://www.zlib.net/zlib_tech.html, in the worst case, zlib will store
+  // uncompressed data as-is, at an overhead of 5 bytes per 16384-byte block.
+  // Zero-length input will “compress” to a 2-byte zlib stream. Add the overhead
+  // of the gzip wrapper, assuming no optional fields are present.
+  size_t buf_size =
+      string.size() + kGzipHeaderSize +
+      (string.empty() ? 2 : (((string.size() + 16383) / 16384) * 5));
+  std::unique_ptr<uint8_t[]> buf(new uint8_t[buf_size]);
+  FileOperationResult compressed_bytes =
+      gzip_stream.GetBytesBuffer(buf.get(), buf_size);
+  ASSERT_NE(compressed_bytes, -1);
+  ASSERT_LE(static_cast<size_t>(compressed_bytes), buf_size);
+
+  // Make sure that the stream is really at EOF.
+  uint8_t eof_buf[16];
+  ASSERT_EQ(0, gzip_stream.GetBytesBuffer(eof_buf, sizeof(eof_buf)));
+
+  std::string compressed(reinterpret_cast<char*>(buf.get()), compressed_bytes);
+
+  ASSERT_GE(compressed.size(), kGzipHeaderSize);
+  EXPECT_EQ('\37', compressed[0]);
+  EXPECT_EQ('\213', compressed[1]);
+  EXPECT_EQ(Z_DEFLATED, compressed[2]);
+
+  std::string decompressed;
+  ASSERT_NO_FATAL_FAILURE(
+      GzipInflate(compressed, &decompressed, string.size()));
+
+  EXPECT_EQ(string, decompressed);
+
+  // In block mode, compression should be identical.
+  string_stream.reset(new StringHTTPBodyStream(string));
+  GzipHTTPBodyStream block_gzip_stream(std::move(string_stream));
+  uint8_t block_buf[4096];
+  std::string block_compressed;
+  FileOperationResult block_compressed_bytes;
+  while ((block_compressed_bytes = block_gzip_stream.GetBytesBuffer(
+              block_buf, sizeof(block_buf))) > 0) {
+    block_compressed.append(reinterpret_cast<char*>(block_buf),
+                            block_compressed_bytes);
+  }
+  ASSERT_EQ(0, block_compressed_bytes);
+  EXPECT_EQ(compressed, block_compressed);
+}
+
+std::string MakeString(size_t size) {
+  std::string string;
+  for (size_t i = 0; i < size; ++i) {
+    string.append(1, (i % 256) ^ ((i >> 8) % 256));
+  }
+  return string;
+}
+
+constexpr size_t kFourKBytes = 4096;
+constexpr size_t kManyBytes = 375017;
+
+TEST(GzipHTTPBodyStream, Empty) {
+  TestGzipDeflateInflate(std::string());
+}
+
+TEST(GzipHTTPBodyStream, OneByte) {
+  TestGzipDeflateInflate(std::string("Z"));
+}
+
+TEST(GzipHTTPBodyStream, FourKBytes_NUL) {
+  TestGzipDeflateInflate(std::string(kFourKBytes, '\0'));
+}
+
+TEST(GzipHTTPBodyStream, ManyBytes_NUL) {
+  TestGzipDeflateInflate(std::string(kManyBytes, '\0'));
+}
+
+TEST(GzipHTTPBodyStream, FourKBytes_Deterministic) {
+  TestGzipDeflateInflate(MakeString(kFourKBytes));
+}
+
+TEST(GzipHTTPBodyStream, ManyBytes_Deterministic) {
+  TestGzipDeflateInflate(MakeString(kManyBytes));
+}
+
+TEST(GzipHTTPBodyStream, FourKBytes_Random) {
+  TestGzipDeflateInflate(base::RandBytesAsString(kFourKBytes));
+}
+
+TEST(GzipHTTPBodyStream, ManyBytes_Random) {
+  TestGzipDeflateInflate(base::RandBytesAsString(kManyBytes));
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace crashpad