Get module versions and types from in-memory images

snapshot/win/pe_image_resource_reader.h

Index: snapshot/win/pe_image_resource_reader.h
diff --git a/snapshot/win/pe_image_resource_reader.h b/snapshot/win/pe_image_resource_reader.h
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+// 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.
+
+#ifndef CRASHPAD_SNAPSHOT_WIN_PE_IMAGE_RESOURCE_READER_H_
+#define CRASHPAD_SNAPSHOT_WIN_PE_IMAGE_RESOURCE_READER_H_
+
+#include <stdint.h>
+#include <windows.h>
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "snapshot/win/process_subrange_reader.h"
+#include "util/misc/initialization_state_dcheck.h"
+#include "util/win/address_types.h"
+
+namespace crashpad {
+
+//! \brief A reader for resources stored in PE images mapped into another
+//!     process.
+//!
+//! \sa PEImageReader
+class PEImageResourceReader {
+ public:
+  PEImageResourceReader();
+  ~PEImageResourceReader();
+
+  //! \brief Initializes the resource reader.
+  //!
+  //! \param[in] module_subrange_reader The reader for the module.
+  //! \param[in] resources_directory_entry The module’s `IMAGE_DATA_DIRECTORY`
+  //!     for its resources area. This is taken from the module’s
+  //!     `IMAGE_OPTIONAL_HEADER::DataDirectory` at index
+  //!     `IMAGE_DIRECTORY_ENTRY_RESOURCE`.
+  //!
+  //! \return `true` on success, `false` on failure with a message logged.
+  bool Initialize(const ProcessSubrangeReader& module_subrange_reader,
+                  const IMAGE_DATA_DIRECTORY& resources_directory_entry);
+
+  //! \brief Locates a resource in a module by its ID.
+  //!
+  //! This method is similar to `FindResourceEx()`, but it operates on modules
+  //! loaded in a remote process’ address space. It is not necessary to
+  //! `LoadLibrary()` a module into a process in order to use this method.
+  //!
+  //! No support is provided at present for locating resources by \a type or \a
+  //! name using strings as opposed to integer identifiers.
+  //!
+  //! Languages are scanned in the order determined by
+  //! GetEntryFromResourceDirectoryByLanguage().
+  //!
+  //! \param[in] type The integer identifier of the resource type, as in the
+  //!     `lpType` parameter of `FindResourceEx()`.
+  //! \param[in] name The integer identifier of the resource, as in the `lpName`
+  //!     parameter of `FindResourceEx()`.
+  //! \param[in] language The language of the resource, as in the `wLanguage`
+  //!     parameter of `FindResourceEx()`.
+  //! \param[out] address The address, in the remote process’ address space, of
+  //!     the resource data.
+  //! \param[out] size The size of the resource data.
+  //! \param[out] code_page The code page used to encode textual resource data.
+  //!     This parameter is optional.
+  //!
+  //! \return `true` on success, with the out parameters set appropriately.
+  //!     `false` if the resource was not found, without logging any messages.
+  //!     `false` on failure, with a message logged.
+  bool FindResourceByID(uint16_t type,
+                        uint16_t name,
+                        uint16_t language,
+                        WinVMAddress* address,
+                        WinVMSize* size,
+                        uint32_t* code_page) const;
+
+ private:
+  //! \brief Locates a resource directory entry within a resource directory by
+  //!     integer ID.
+  //!
+  //! \param[in] resource_directory_offset The offset, in the module’s resources
+  //!     area, of the resource directory to search.
+  //! \param[in] id The integer identifier of the resource to search for.
+  //! \param[in] want_subdirectory `true` if the resource directory entry is
+  //!     expected to be a resource directory itself, `false` otherwise.
+  //!
+  //! \return The offset, in the module’s resources area, of the entry that was
+  //!     found. On failure, `0`. `0` is technically a valid offset, but it
+  //!     corresponds to the root resource directory, which should never be the
+  //!     offset of another resource directory entry. If \a id was not found,
+  //!     `0` will be returned without logging anything. For other failures, a
+  //!     message will be logged.
+  uint32_t GetEntryFromResourceDirectoryByID(uint32_t resource_directory_offset,
+                                             uint16_t id,
+                                             bool want_subdirectory) const;
+
+  //! \brief Locates a resource directory entry within a resource directory by
+  //!     language.
+  //!
+  //! This method is similar to GetEntryFromResourceDirectoryByID() with \a
+  //! want_subdirectory set to `false`. Attempts are made to locate the resource
+  //! by using these languages:
+  //! <ul>
+  //!     <li>If \a language is `LANG_NEUTRAL`:</li>
+  //!     <ul>
+  //!         <li>Unless `SUBLANG_SYS_DEFAULT` is specified, the language of the
+  //!             thread’s locale, with its normal sublanguage and with
+  //!             `SUBLANG_NEUTRAL`.</li>
+  //!         <li>Unless `SUBLANG_SYS_DEFAULT` is specified, the language of the
+  //!             user’s default locale, with its normal sublanguage and with
+  //!             `SUBLANG_NEUTRAL`.</li>
+  //!         <li>Unless `SUBLANG_DEFAULT` is specified, the language of the
+  //!             system’s default locale, with its normal sublanguage and with
+  //!             `SUBLANG_NEUTRAL`.</li>
+  //!     </ul>
+  //!     <li>If \a language is not `LANG_NEUTRAL`:</li>
+  //!     <ul>
+  //!         <li>\a language</li>
+  //!         <li>\a language, with `SUBLANG_NEUTRAL`</li>
+  //!     </ul>
+  //!     <li>`LANG_NEUTRAL` with `SUBLANG_NEUTRAL`</li>
+  //!     <li>`LANG_ENGLISH` with `SUBLANG_DEFAULT`</li>
+  //!     <li>If none of the above match, the first language found</li>
+  //! </ul>
+  //!
+  //! If only a specific language is desired without any fallbacks, call
+  //! GetEntryFromResourceDirectoryByID() with the language directory’s offset
+  //! instead, passing the desired language in the \a id parameter, and `false`
+  //! for \a want_subdirectory.
+  //!
+  //! \param[in] language_directory_offset The offset, in the module’s resources
+  //!     area, of the resource directory to search.
+  //! \param[in] language The language of the resource to search for.
+  //!
+  //! \return The return value is as in GetEntryFromResourceDirectoryByID().
+  uint32_t GetEntryFromResourceDirectoryByLanguage(
+      uint32_t language_directory_offset,
+      uint16_t language) const;
+
+  //! \brief Reads a resource directory.
+  //!
+  //! \param[in] resource_directory_offset The offset, in the module’s resources
+  //!     area, of the resource directory to read.
+  //! \param[out] resource_directory The `IMAGE_RESOURCE_DIRECTORY` structure.
+  //!     This parameter is optional.
+  //! \param[out] named_entries A vector of \a
+  //!     resource_directory->NumberOfNamedEntries
+  //!     `IMAGE_RESOURCE_DIRECTORY_ENTRY` items that follow the resource
+  //!     directory. This parameter is optional.
+  //! \param[out] id_entries A vector of \a
+  //!     resource_directory->NumberOfIdEntries `IMAGE_RESOURCE_DIRECTORY_ENTRY`
+  //!     items that follow the named entries. This parameter is optional.
+  //!
+  //! \return `true` on success, with the out parameters set appropriately.
+  //!     `false` on failure with a message logged.
+  bool ReadResourceDirectory(
+      uint32_t resource_directory_offset,
+      IMAGE_RESOURCE_DIRECTORY* resource_directory,
+      std::vector<IMAGE_RESOURCE_DIRECTORY_ENTRY>* named_entries,
+      std::vector<IMAGE_RESOURCE_DIRECTORY_ENTRY>* id_entries) const;
+
+  ProcessSubrangeReader resources_subrange_reader_;
+  WinVMAddress module_base_;
+  InitializationStateDcheck initialized_;
+
+  DISALLOW_COPY_AND_ASSIGN(PEImageResourceReader);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_WIN_PE_IMAGE_RESOURCE_READER_H_