Add ProcessSnapshotMinidump, the beginning of the minidump variant of the Snapshot family

snapshot/minidump/process_snapshot_minidump.cc

Index: snapshot/minidump/process_snapshot_minidump.cc
diff --git a/snapshot/minidump/process_snapshot_minidump.cc b/snapshot/minidump/process_snapshot_minidump.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a882c7cdb4818201b16f0fbdcffdd104c2560e8e
--- /dev/null
+++ b/snapshot/minidump/process_snapshot_minidump.cc
@@ -0,0 +1,189 @@
+// Copyright 2015 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 "snapshot/minidump/process_snapshot_minidump.h"
+
+#include "util/file/file_io.h"
+#include "snapshot/minidump/minidump_simple_string_dictionary_reader.h"
+
+namespace crashpad {
+
+ProcessSnapshotMinidump::ProcessSnapshotMinidump()
+    : ProcessSnapshot(),
+      header_(),
+      stream_directory_(),
+      stream_map_(),
+      crashpad_info_(),
+      annotations_simple_map_(),
+      file_reader_(nullptr),
+      initialized_() {
+}
+
+ProcessSnapshotMinidump::~ProcessSnapshotMinidump() {
+}
+
+bool ProcessSnapshotMinidump::Initialize(FileReaderInterface* file_reader) {
+  INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
+
+  file_reader_ = file_reader;
+
+  if (!file_reader_->SeekSet(0)) {
+    return false;
+  }
+
+  if (!file_reader_->ReadExactly(&header_, sizeof(header_))) {
+    return false;
+  }
+
+  if (header_.Signature != MINIDUMP_SIGNATURE) {
+    LOG(ERROR) << "minidump signature mismatch";
+    return false;
+  }
+
+  if (header_.Version != MINIDUMP_VERSION) {
+    LOG(ERROR) << "minidump version mismatch";
+    return false;
+  }
+
+  if (!file_reader->SeekSet(header_.StreamDirectoryRva)) {
+    return false;
+  }
+
+  stream_directory_.resize(header_.NumberOfStreams);
+  if (!file_reader_->ReadExactly(
+          &stream_directory_[0],
+          header_.NumberOfStreams * sizeof(stream_directory_[0]))) {
+    return false;
+  }
+
+  for (const MINIDUMP_DIRECTORY& directory : stream_directory_) {
+    const MinidumpStreamType stream_type =
+        static_cast<MinidumpStreamType>(directory.StreamType);
+    if (stream_map_.find(stream_type) != stream_map_.end()) {
+      LOG(ERROR) << "duplicate streams for type " << directory.StreamType;
+      return false;
+    }
+
+    stream_map_[stream_type] = &directory.Location;
+  }
+
+  INITIALIZATION_STATE_SET_VALID(initialized_);
+
+  InitializeCrashpadInfo();
+
+  return true;
+}
+
+pid_t ProcessSnapshotMinidump::ProcessID() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  return 0;
+}
+
+pid_t ProcessSnapshotMinidump::ParentProcessID() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  return 0;
+}
+
+void ProcessSnapshotMinidump::SnapshotTime(timeval* snapshot_time) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  snapshot_time->tv_sec = 0;
+  snapshot_time->tv_usec = 0;
+}
+
+void ProcessSnapshotMinidump::ProcessStartTime(timeval* start_time) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  start_time->tv_sec = 0;
+  start_time->tv_usec = 0;
+}
+
+void ProcessSnapshotMinidump::ProcessCPUTimes(timeval* user_time,
+                                              timeval* system_time) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  user_time->tv_sec = 0;
+  user_time->tv_usec = 0;
+  system_time->tv_sec = 0;
+  system_time->tv_usec = 0;
+}
+
+const std::map<std::string, std::string>&
+ProcessSnapshotMinidump::AnnotationsSimpleMap() const {
+  // TODO(mark): This method should not be const, although the interface
+  // currently imposes this requirement. Making it non-const would allow
+  // annotations_simple_map_ to be lazily constructed: InitializeCrashpadInfo()
+  // could be called here, and from other locations that require it, rather than
+  // calling it from Initialize().
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return annotations_simple_map_;
+}
+
+const SystemSnapshot* ProcessSnapshotMinidump::System() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  return nullptr;
+}
+
+std::vector<const ThreadSnapshot*> ProcessSnapshotMinidump::Threads() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  return std::vector<const ThreadSnapshot*>();
+}
+
+std::vector<const ModuleSnapshot*> ProcessSnapshotMinidump::Modules() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  return std::vector<const ModuleSnapshot*>();
+}
+
+const ExceptionSnapshot* ProcessSnapshotMinidump::Exception() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  NOTREACHED();
+  return nullptr;
+}
+
+void ProcessSnapshotMinidump::InitializeCrashpadInfo() {
+  const auto& it = stream_map_.find(kMinidumpStreamTypeCrashpadInfo);
+  if (it == stream_map_.end()) {
+    return;
+  }
+
+  if (it->second->DataSize < sizeof(crashpad_info_)) {
+    LOG(ERROR) << "crashpad_info size mismatch";
+    return;
+  }
+
+  if (!file_reader_->SeekSet(it->second->Rva)) {
+    return;
+  }
+
+  if (!file_reader_->ReadExactly(&crashpad_info_, sizeof(crashpad_info_))) {
+    return;
+  }
+
+  if (crashpad_info_.version != MinidumpCrashpadInfo::kVersion) {
+    LOG(ERROR) << "crashpad_info version mismatch";
+    return;
+  }
+
+  internal::ReadMinidumpSimpleStringDictionary(
+      file_reader_,
+      crashpad_info_.simple_annotations,
+      &annotations_simple_map_);
+}
+
+}  // namespace crashpad