src/net/spdy/fuzzing/hpack_example_generator.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/at_exit.h"
   6 #include "base/command_line.h"
   7 #include "base/file_util.h"
   8 #include "base/files/file.h"
   9 #include "base/strings/string_number_conversions.h"
  10 #include "net/spdy/fuzzing/hpack_fuzz_util.h"
  11 #include "net/spdy/hpack_constants.h"
  12 #include "net/spdy/hpack_encoder.h"
  13
  14 namespace {
  15
  16 // Target file for generated HPACK header sets.
  17 const char kFileToWrite[] = "file-to-write";
  18
  19 // Number of header sets to generate.
  20 const char kExampleCount[] = "example-count";
  21
  22 }  // namespace
  23
  24 using net::HpackFuzzUtil;
  25 using std::map;
  26 using std::string;
  27
  28 // Generates a configurable number of header sets (using HpackFuzzUtil), and
  29 // sequentially encodes each header set with an HpackEncoder. Encoded header
  30 // sets are written to the output file in length-prefixed blocks.
  31 int main(int argc, char** argv) {
  32   base::AtExitManager exit_manager;
  33
  34   CommandLine::Init(argc, argv);
  35   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
  36
  37   if (!command_line.HasSwitch(kFileToWrite) ||
  38       !command_line.HasSwitch(kExampleCount)) {
  39     LOG(ERROR) << "Usage: " << argv[0]
  40                << " --" << kFileToWrite << "=/path/to/file.out"
  41                << " --" << kExampleCount << "=1000";
  42     return -1;
  43   }
  44   string file_to_write = command_line.GetSwitchValueASCII(kFileToWrite);
  45
  46   int example_count = 0;
  47   base::StringToInt(command_line.GetSwitchValueASCII(kExampleCount),
  48                     &example_count);
  49
  50   DVLOG(1) << "Writing output to " << file_to_write;
  51   base::File file_out(base::FilePath::FromUTF8Unsafe(file_to_write),
  52                       base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE);
  53   CHECK(file_out.IsValid()) << file_out.error_details();
  54
  55   HpackFuzzUtil::GeneratorContext context;
  56   HpackFuzzUtil::InitializeGeneratorContext(&context);
  57   net::HpackEncoder encoder(net::ObtainHpackHuffmanTable());
  58
  59   for (int i = 0; i != example_count; ++i) {
  60     map<string, string> headers =
  61         HpackFuzzUtil::NextGeneratedHeaderSet(&context);
  62
  63     string buffer;
  64     CHECK(encoder.EncodeHeaderSet(headers, &buffer));
  65
  66     string prefix = HpackFuzzUtil::HeaderBlockPrefix(buffer.size());
  67
  68     CHECK_LT(0, file_out.WriteAtCurrentPos(prefix.data(), prefix.size()));
  69     CHECK_LT(0, file_out.WriteAtCurrentPos(buffer.data(), buffer.size()));
  70   }
  71   CHECK(file_out.Flush());
  72   DVLOG(1) << "Generated " << example_count << " blocks.";
  73   return 0;
  74 }