snapshot: Add a minimal ModuleSnapshotMinidump and accessor from ProcessSnapshotMinidump

snapshot/minidump/minidump_string_list_reader.cc

+// 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/minidump_string_list_reader.h"
+
+#include "base/logging.h"
+#include "minidump/minidump_extensions.h"
+#include "snapshot/minidump/minidump_string_reader.h"
+
+namespace crashpad {
+namespace internal {
+
+bool ReadMinidumpStringList(FileReaderInterface* file_reader,
+                            const MINIDUMP_LOCATION_DESCRIPTOR& location,
+                            std::vector<std::string>* list) {
+  list->clear();
+
+  if (location.Rva == 0) {
+    return true;
+  }
+
+  if (location.DataSize < sizeof(MinidumpRVAList)) {
+    LOG(ERROR) << "string_list size mismatch";
+    return false;
+  }
+
+  if (!file_reader->SeekSet(location.Rva)) {
+    return false;
+  }
+
+  uint32_t entry_count;
+  if (!file_reader->ReadExactly(&entry_count, sizeof(entry_count))) {
+    return false;
+  }
+
+  if (location.DataSize !=
+      sizeof(MinidumpRVAList) + entry_count * sizeof(RVA)) {
+    LOG(ERROR) << "string_list size mismatch";
+    return false;
+  }
+
+  std::vector<RVA> rvas(entry_count);
+  if (!file_reader->ReadExactly(&rvas[0], entry_count * sizeof(rvas[0]))) {
+    return false;
+  }
+
+  for (RVA rva : rvas) {
+    std::string element;
+    if (!ReadMinidumpUTF8String(file_reader, rva, &element)) {
+      // Not a hard error, keep trying.
+      continue;
+    }
+
+    list->push_back(element);
+  }
+
+  return true;
+}
+
+}  // namespace internal
+}  // namespace crashpad