Revert 198736 "Land Recent QUIC changes"

trunk/src/net/quic/crypto/cert_compressor.cc

Index: trunk/src/net/quic/crypto/cert_compressor.cc
===================================================================
--- trunk/src/net/quic/crypto/cert_compressor.cc	(revision 198763)
+++ trunk/src/net/quic/crypto/cert_compressor.cc	(working copy)
@@ -1,641 +0,0 @@
-// Copyright (c) 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 "net/quic/crypto/cert_compressor.h"
-
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "net/quic/quic_utils.h"
-#include "third_party/zlib/zlib.h"
-
-using base::StringPiece;
-using std::string;
-using std::vector;
-
-namespace net {
-
-namespace {
-
-// kCommonCertSubstrings contains ~1500 bytes of common certificate substrings
-// in order to help zlib.
-static unsigned char kCommonCertSubstrings[] = {
-  0x04, 0x02, 0x30, 0x00, 0x30, 0x1d, 0x06, 0x03, 0x55, 0x1d, 0x25, 0x04,
-  0x16, 0x30, 0x14, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x03,
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-  0x5f, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x86, 0xf8, 0x42, 0x04, 0x01,
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-};
-
-// CertEntry represents a certificate in compressed form. Each entry is one of
-// the three types enumerated in |Type|.
-struct CertEntry {
- public:
-  enum Type {
-    // COMPRESSED means that the certificate is included in the trailing zlib
-    // data.
-    COMPRESSED = 1,
-    // CACHED means that the certificate is already known to the peer and will
-    // be replaced by its 64-bit hash (in |hash|).
-    CACHED = 2,
-    // COMMON means that the certificate is in a common certificate set known
-    // to the peer with hash |set_hash| and index |index|.
-    COMMON = 3,
-  };
-
-  Type type;
-  uint64 hash;
-  uint64 set_hash;
-  uint32 index;
-};
-
-// MatchCerts returns a vector of CertEntries describing how to most
-// efficiently represent |certs| to a peer who has the common sets identified
-// by |client_common_set_hashes| and who has cached the certificates with the
-// 64-bit, FNV-1a hashes in |client_cached|.
-vector<CertEntry> MatchCerts(const vector<string>& certs,
-                             StringPiece client_common_set_hashes,
-                             StringPiece client_cached,
-                             CommonCertSet* common_set) {
-  vector<CertEntry> entries;
-  entries.reserve(certs.size());
-
-  const bool cached_valid = client_cached.size() % sizeof(uint64) == 0 &&
-                            !client_cached.empty();
-
-  for (vector<string>::const_iterator i = certs.begin();
-       i != certs.end(); ++i) {
-    CertEntry entry;
-
-    if (cached_valid) {
-      bool cached = false;
-
-      uint64 hash = QuicUtils::FNV1a_64_Hash(i->data(), i->size());
-      // This assumes that the machine is little-endian.
-      for (size_t i = 0; i < client_cached.size(); i += sizeof(uint64)) {
-        uint64 cached_hash;
-        memcpy(&cached_hash, client_cached.data() + i, sizeof(uint64));
-        if (hash != cached_hash) {
-          continue;
-        }
-
-        entry.type = CertEntry::CACHED;
-        entry.hash = hash;
-        entries.push_back(entry);
-        cached = true;
-        break;
-      }
-
-      if (cached) {
-        continue;
-      }
-    }
-
-    if (common_set &&
-        common_set->MatchCert(*i, client_common_set_hashes, &entry.set_hash,
-                              &entry.index)) {
-      entry.type = CertEntry::COMMON;
-      entries.push_back(entry);
-      continue;
-    }
-
-    entry.type = CertEntry::COMPRESSED;
-    entries.push_back(entry);
-  }
-
-  return entries;
-}
-
-// CertEntriesSize returns the size, in bytes, of the serialised form of
-// |entries|.
-size_t CertEntriesSize(const vector<CertEntry>& entries) {
-  size_t entries_size = 0;
-
-  for (vector<CertEntry>::const_iterator i = entries.begin();
-       i != entries.end(); ++i) {
-    switch (i->type) {
-      case CertEntry::COMPRESSED:
-        entries_size++;
-        break;
-      case CertEntry::CACHED:
-        entries_size += 1 + sizeof(uint64);
-        break;
-      case CertEntry::COMMON:
-        entries_size += 1 + sizeof(uint64) + sizeof(uint32);
-        break;
-    }
-  }
-
-  entries_size++;  // for end marker
-
-  return entries_size;
-}
-
-// SerializeCertEntries serialises |entries| to |out|, which must have enough
-// space to contain them.
-void SerializeCertEntries(uint8* out, const vector<CertEntry>& entries) {
-  for (vector<CertEntry>::const_iterator i = entries.begin();
-       i != entries.end(); ++i) {
-    *out++ = i->type;
-    switch (i->type) {
-      case CertEntry::COMPRESSED:
-        break;
-      case CertEntry::CACHED:
-        memcpy(out, &i->hash, sizeof(i->hash));
-        out += sizeof(uint64);
-        break;
-      case CertEntry::COMMON:
-        // Assumes a little-endian machine.
-        memcpy(out, &i->set_hash, sizeof(i->set_hash));
-        out += sizeof(i->set_hash);
-        memcpy(out, &i->index, sizeof(uint32));
-        out += sizeof(uint32);
-        break;
-    }
-  }
-
-  *out++ = 0;  // end marker
-}
-
-// ZlibDictForEntries returns a string that contains the zlib pre-shared
-// dictionary to use in order to decompress a zlib block following |entries|.
-// |certs| is one-to-one with |entries| and contains the certificates for those
-// entries that are CACHED or COMMON.
-string ZlibDictForEntries(const vector<CertEntry>& entries,
-                          const vector<string>& certs) {
-  string zlib_dict;
-
-  // The dictionary starts with the common and cached certs in reverse order.
-  size_t zlib_dict_size = 0;
-  for (size_t i = certs.size() - 1; i < certs.size(); i--) {
-    if (entries[i].type != CertEntry::COMPRESSED) {
-      zlib_dict_size += certs[i].size();
-    }
-  }
-
-  // At the end of the dictionary is a block of common certificate substrings.
-  zlib_dict_size += sizeof(kCommonCertSubstrings);
-
-  zlib_dict.reserve(zlib_dict_size);
-
-  for (size_t i = certs.size() - 1; i < certs.size(); i--) {
-    if (entries[i].type != CertEntry::COMPRESSED) {
-      zlib_dict += certs[i];
-    }
-  }
-
-  zlib_dict += string(reinterpret_cast<const char*>(kCommonCertSubstrings),
-                      sizeof(kCommonCertSubstrings));
-
-  DCHECK_EQ(zlib_dict.size(), zlib_dict_size);
-
-  return zlib_dict;
-}
-
-// HashCerts returns the FNV-1a hashes of |certs|.
-vector<uint64> HashCerts(const vector<string>& certs) {
-  vector<uint64> ret;
-
-  for (vector<string>::const_iterator i = certs.begin();
-       i != certs.end(); ++i) {
-    ret.push_back(QuicUtils::FNV1a_64_Hash(i->data(), i->size()));
-  }
-
-  return ret;
-}
-
-// ParseEntries parses the serialised form of a vector of CertEntries from
-// |in_out| and writes them to |out_entries|. CACHED and COMMON entries are
-// resolved using |cached_certs| and |common_set| and written to |out_certs|.
-// |in_out| is updated to contain the trailing data.
-bool ParseEntries(StringPiece* in_out,
-                  const vector<string>& cached_certs,
-                  CommonCertSet* common_set,
-                  vector<CertEntry>* out_entries,
-                  vector<string>* out_certs) {
-  StringPiece in = *in_out;
-  vector<uint64> cached_hashes;
-
-  out_entries->clear();
-  out_certs->clear();
-
-  for (;;) {
-    if (in.empty()) {
-      return false;
-    }
-    CertEntry entry;
-    const uint8 type_byte = in[0];
-    in.remove_prefix(1);
-
-    if (type_byte == 0) {
-      break;
-    }
-
-    entry.type = static_cast<CertEntry::Type>(type_byte);
-
-    switch (entry.type) {
-      case CertEntry::COMPRESSED:
-        out_certs->push_back(string());
-        break;
-      case CertEntry::CACHED: {
-        if (in.size() < sizeof(uint64)) {
-          return false;
-        }
-        memcpy(&entry.hash, in.data(), sizeof(uint64));
-        in.remove_prefix(sizeof(uint64));
-
-        if (cached_hashes.size() != cached_certs.size()) {
-          cached_hashes = HashCerts(cached_certs);
-        }
-        bool found = false;
-        for (size_t i = 0; i < cached_hashes.size(); i++) {
-          if (cached_hashes[i] == entry.hash) {
-            out_certs->push_back(cached_certs[i]);
-            found = true;
-            break;
-          }
-        }
-        if (!found) {
-          return false;
-        }
-        break;
-      }
-      case CertEntry::COMMON: {
-        if (!common_set) {
-          return false;
-        }
-        if (in.size() < sizeof(uint64)) {
-          return false;
-        }
-        memcpy(&entry.set_hash, in.data(), sizeof(uint64));
-        in.remove_prefix(sizeof(uint64));
-
-        if (in.size() < sizeof(uint32)) {
-          return false;
-        }
-        memcpy(&entry.index, in.data(), sizeof(uint32));
-        in.remove_prefix(sizeof(uint32));
-
-        StringPiece cert = common_set->GetCert(entry.set_hash, entry.index);
-        if (cert.empty()) {
-          return false;
-        }
-        out_certs->push_back(cert.as_string());
-        break;
-      }
-      default:
-        return false;
-    }
-    out_entries->push_back(entry);
-  }
-
-  *in_out = in;
-  return true;
-}
-
-class ScopedZLib {
- public:
-  enum Type {
-    INFLATE,
-    DEFLATE,
-  };
-
-  explicit ScopedZLib(Type type)
-      : z_(NULL),
-        type_(type) {
-  }
-
-  void reset(z_stream* z) {
-    z_ = z;
-  }
-
-  ~ScopedZLib() {
-    if (z_) {
-      if (type_ == DEFLATE) {
-        deflateEnd(z_);
-      } else {
-        inflateEnd(z_);
-      }
-      z_ = NULL;
-    }
-  }
-
- private:
-  z_stream* z_;
-  const Type type_;
-};
-
-}  // anonymous namespace
-
-
-// static
-string CertCompressor::CompressChain(const vector<string>& certs,
-                                     StringPiece client_common_set_hashes,
-                                     StringPiece client_cached,
-                                     CommonCertSet* common_set) {
-  const vector<CertEntry> entries = MatchCerts(
-      certs, client_common_set_hashes, client_cached, common_set);
-  DCHECK_EQ(entries.size(), certs.size());
-
-  size_t uncompressed_size = 0;
-  for (size_t i = 0; i < entries.size(); i++) {
-    if (entries[i].type == CertEntry::COMPRESSED) {
-      uncompressed_size += 4 /* uint32 length */ + certs[i].size();
-    }
-  }
-
-  size_t compressed_size = 0;
-  z_stream z;
-  ScopedZLib scoped_z(ScopedZLib::DEFLATE);
-
-  if (uncompressed_size > 0) {
-    memset(&z, 0, sizeof(z));
-    int rv = deflateInit(&z, Z_DEFAULT_COMPRESSION);
-    DCHECK_EQ(Z_OK, rv);
-    if (rv != Z_OK) {
-      return "";
-    }
-    scoped_z.reset(&z);
-
-    string zlib_dict = ZlibDictForEntries(entries, certs);
-
-    rv = deflateSetDictionary(&z, reinterpret_cast<const uint8*>(&zlib_dict[0]),
-                              zlib_dict.size());
-    DCHECK_EQ(Z_OK, rv);
-    if (rv != Z_OK) {
-      return "";
-    }
-
-    compressed_size = deflateBound(&z, uncompressed_size);
-  }
-
-  const size_t entries_size = CertEntriesSize(entries);
-
-  string result;
-  result.resize(entries_size + (uncompressed_size > 0 ? 4 : 0) +
-                compressed_size);
-
-  uint8* j = reinterpret_cast<uint8*>(&result[0]);
-  SerializeCertEntries(j, entries);
-  j += entries_size;
-
-  if (uncompressed_size == 0) {
-    return result;
-  }
-
-  uint32 uncompressed_size_32 = uncompressed_size;
-  memcpy(j, &uncompressed_size_32, sizeof(uint32));
-  j += sizeof(uint32);
-
-  int rv;
-
-  z.next_out = j;
-  z.avail_out = compressed_size;
-
-  for (size_t i = 0; i < certs.size(); i++) {
-    if (entries[i].type != CertEntry::COMPRESSED) {
-      continue;
-    }
-
-    uint32 length = certs[i].size();
-    z.next_in = reinterpret_cast<uint8*>(&length);
-    z.avail_in = sizeof(length);
-    rv = deflate(&z, Z_NO_FLUSH);
-    DCHECK_EQ(Z_OK, rv);
-    DCHECK_EQ(0u, z.avail_in);
-    if (rv != Z_OK || z.avail_in) {
-      return "";
-    }
-
-    z.next_in =
-        const_cast<uint8*>(reinterpret_cast<const uint8*>(certs[i].data()));
-    z.avail_in = certs[i].size();
-    rv = deflate(&z, Z_NO_FLUSH);
-    DCHECK_EQ(Z_OK, rv);
-    DCHECK_EQ(0u, z.avail_in);
-    if (rv != Z_OK || z.avail_in) {
-      return "";
-    }
-  }
-
-  z.avail_in = 0;
-  rv = deflate(&z, Z_FINISH);
-  DCHECK_EQ(Z_STREAM_END, rv);
-  if (rv != Z_STREAM_END) {
-    return "";
-  }
-
-  result.resize(result.size() - z.avail_out);
-  return result;
-}
-
-// static
-bool CertCompressor::DecompressChain(StringPiece in,
-                                     const vector<string>& cached_certs,
-                                     CommonCertSet* common_set,
-                                     vector<string>* out_certs) {
-  vector<CertEntry> entries;
-  if (!ParseEntries(&in, cached_certs, common_set, &entries, out_certs)) {
-    return false;
-  }
-  DCHECK_EQ(entries.size(), out_certs->size());
-
-  scoped_ptr<uint8[]> uncompressed_data;
-  StringPiece uncompressed;
-
-  if (!in.empty()) {
-    if (in.size() < sizeof(uint32)) {
-      return false;
-    }
-
-    uint32 uncompressed_size;
-    memcpy(&uncompressed_size, in.data(), sizeof(uncompressed_size));
-    in.remove_prefix(sizeof(uint32));
-
-    if (uncompressed_size > 128 * 1024) {
-      return false;
-    }
-
-    uncompressed_data.reset(new uint8[uncompressed_size]);
-    z_stream z;
-    ScopedZLib scoped_z(ScopedZLib::INFLATE);
-
-    memset(&z, 0, sizeof(z));
-    z.next_out = uncompressed_data.get();
-    z.avail_out = uncompressed_size;
-    z.next_in = const_cast<uint8*>(reinterpret_cast<const uint8*>(in.data()));
-    z.avail_in = in.size();
-
-    if (Z_OK != inflateInit(&z)) {
-      return false;
-    }
-    scoped_z.reset(&z);
-
-    int rv = inflate(&z, Z_FINISH);
-    if (rv == Z_NEED_DICT) {
-      string zlib_dict = ZlibDictForEntries(entries, *out_certs);
-      const uint8* dict = reinterpret_cast<const uint8*>(zlib_dict.data());
-      if (Z_OK != inflateSetDictionary(&z, dict, zlib_dict.size())) {
-        return false;
-      }
-      rv = inflate(&z, Z_FINISH);
-    }
-
-    if (Z_STREAM_END != rv ||
-        z.avail_out > 0 ||
-        z.avail_in > 0) {
-      return false;
-    }
-
-    uncompressed = StringPiece(reinterpret_cast<char*>(uncompressed_data.get()),
-                               uncompressed_size);
-  }
-
-  for (size_t i = 0; i < entries.size(); i++) {
-    switch (entries[i].type) {
-      case CertEntry::COMPRESSED:
-        if (uncompressed.size() < sizeof(uint32)) {
-          return false;
-        }
-        uint32 cert_len;
-        memcpy(&cert_len, uncompressed.data(), sizeof(cert_len));
-        uncompressed.remove_prefix(sizeof(uint32));
-        if (uncompressed.size() < cert_len) {
-          return false;
-        }
-        (*out_certs)[i] = uncompressed.substr(0, cert_len).as_string();
-        uncompressed.remove_prefix(cert_len);
-        break;
-      case CertEntry::CACHED:
-      case CertEntry::COMMON:
-        break;
-    }
-  }
-
-  if (!uncompressed.empty()) {
-    return false;
-  }
-
-  return true;
-}
-
-}  // namespace net