text: // 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/third_party/quiche/src/http2/hpack/tools/hpack_example.h"
  
  #include <ctype.h>
  
  #include "base/logging.h"
  #include "net/third_party/quiche/src/http2/platform/api/http2_bug_tracker.h"
  #include "net/third_party/quiche/src/http2/platform/api/http2_string_utils.h"
  
  namespace http2 {
  namespace test {
  namespace {
  
  void HpackExampleToStringOrDie(Http2StringPiece example, Http2String* output) {
    while (!example.empty()) {
      const char c0 = example[0];
      if (isxdigit(c0)) {
        CHECK_GT(example.size(), 1u) << "Truncated hex byte?";
        const char c1 = example[1];
        CHECK(isxdigit(c1)) << "Found half a byte?";
        *output += Http2HexDecode(example.substr(0, 2));
        example.remove_prefix(2);
        continue;
      }
      if (isspace(c0)) {
        example.remove_prefix(1);
        continue;
      }
      if (!example.empty() && example[0] == '|') {
        // Start of a comment. Skip to end of line or of input.
        auto pos = example.find('\n');
        if (pos == Http2StringPiece::npos) {
          // End of input.
          break;
        }
        example.remove_prefix(pos + 1);
        continue;
      }
      HTTP2_BUG << "Can't parse byte " << static_cast<int>(c0)
                << Http2StrCat(" (0x", Http2Hex(c0), ")")
                << "\nExample: " << example;
    }
    CHECK_LT(0u, output->size()) << "Example is empty.";
  }
  
  }  // namespace
  
  Http2String HpackExampleToStringOrDie(Http2StringPiece example) {
    Http2String output;
    HpackExampleToStringOrDie(example, &output);
    return output;
  }
  
  }  // namespace test
  }  // namespace http2
  