131 lines
3.5 KiB
C++
131 lines
3.5 KiB
C++
// Copyright (c) 2014 GitHub, Inc. All rights reserved.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "atom/common/asar/archive.h"
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#include <string>
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#include <vector>
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#include "base/files/file.h"
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#include "base/logging.h"
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#include "base/pickle.h"
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#include "base/json/json_string_value_serializer.h"
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#include "base/strings/string_number_conversions.h"
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namespace asar {
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namespace {
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bool GetChildNode(const std::string& name,
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const base::DictionaryValue* root,
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const base::DictionaryValue** out) {
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const base::DictionaryValue* files = NULL;
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return root->GetDictionaryWithoutPathExpansion("files", &files) &&
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files->GetDictionaryWithoutPathExpansion(name, out);
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}
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bool GetNodeFromPath(std::string path,
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const base::DictionaryValue* root,
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const base::DictionaryValue** out) {
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for (size_t delimiter_position = path.find('/');
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delimiter_position != std::string::npos;
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delimiter_position = path.find('/')) {
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const base::DictionaryValue* child = NULL;
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if (!GetChildNode(path.substr(0, delimiter_position), root, &child))
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return false;
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root = child;
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path.erase(0, delimiter_position + 1);
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}
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return GetChildNode(path, root, out);
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}
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} // namespace
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Archive::Archive(const base::FilePath& path)
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: path_(path),
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header_size_(0) {
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}
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Archive::~Archive() {
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}
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bool Archive::Init() {
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base::File file(path_, base::File::FLAG_OPEN | base::File::FLAG_READ);
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if (!file.IsValid()) {
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PLOG(ERROR) << "Unable to open " << path_.value();
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return false;
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}
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std::vector<char> buf;
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int len;
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buf.resize(8);
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len = file.ReadAtCurrentPos(buf.data(), buf.size());
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if (len != static_cast<int>(buf.size())) {
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PLOG(ERROR) << "Failed to read header size from " << path_.value();
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return false;
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}
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uint32 size;
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if (!PickleIterator(Pickle(buf.data(), buf.size())).ReadUInt32(&size)) {
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LOG(ERROR) << "Failed to parse header size from " << path_.value();
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return false;
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}
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buf.resize(size);
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len = file.ReadAtCurrentPos(buf.data(), buf.size());
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if (len != static_cast<int>(buf.size())) {
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PLOG(ERROR) << "Failed to read header from " << path_.value();
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return false;
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}
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std::string header;
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if (!PickleIterator(Pickle(buf.data(), buf.size())).ReadString(&header)) {
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LOG(ERROR) << "Failed to parse header from " << path_.value();
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return false;
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}
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std::string error;
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JSONStringValueSerializer serializer(&header);
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base::Value* value = serializer.Deserialize(NULL, &error);
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if (!value || !value->IsType(base::Value::TYPE_DICTIONARY)) {
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LOG(ERROR) << "Failed to parse header: " << error;
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return false;
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}
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header_size_ = 8 + size;
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header_.reset(static_cast<base::DictionaryValue*>(value));
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return true;
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}
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bool Archive::GetFileInfo(const base::FilePath& path, FileInfo* info) {
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if (!header_)
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return false;
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const base::DictionaryValue* node;
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if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
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return false;
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std::string link;
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if (node->GetString("link", &link))
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return GetFileInfo(base::FilePath::FromUTF8Unsafe(link), info);
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std::string offset;
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if (!node->GetString("offset", &offset))
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return false;
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if (!base::StringToUint64(offset, &info->offset))
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return false;
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int size;
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if (!node->GetInteger("size", &size))
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return false;
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info->offset += header_size_;
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info->size = static_cast<uint32>(size);
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return true;
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}
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} // namespace asar
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