[core] LocalFileSource implementation and tests

2 files changed, 71 insertions, 1 deletions

diff --git a/platform/default/default_file_source.cpp b/platform/default/default_file_source.cpp
index 099890a035..7b52637c15 100644
--- a/platform/default/default_file_source.cpp
+++ b/platform/default/default_file_source.cpp
@@ -1,5 +1,6 @@
 #include <mbgl/storage/default_file_source.hpp>
 #include <mbgl/storage/asset_file_source.hpp>
+#include <mbgl/storage/local_file_source.hpp>
 #include <mbgl/storage/online_file_source.hpp>
 #include <mbgl/storage/offline_database.hpp>
 #include <mbgl/storage/offline_download.hpp>
@@ -164,7 +165,8 @@ DefaultFileSource::DefaultFileSource(const std::string& cachePath,
                                      uint64_t maximumCacheSize)
     : thread(std::make_unique<util::Thread<Impl>>(util::ThreadContext{"DefaultFileSource", util::ThreadPriority::Low},
             cachePath, maximumCacheSize)),
-      assetFileSource(std::make_unique<AssetFileSource>(assetRoot)) {
+      assetFileSource(std::make_unique<AssetFileSource>(assetRoot)),
+      localFileSource(std::make_unique<LocalFileSource>()) {
 }
 
 DefaultFileSource::~DefaultFileSource() = default;
@@ -203,6 +205,8 @@ std::unique_ptr<AsyncRequest> DefaultFileSource::request(const Resource& resourc
 
     if (isAssetURL(resource.url)) {
         return assetFileSource->request(resource, callback);
+    } else if (LocalFileSource::acceptsURL(resource.url)) {
+        return localFileSource->request(resource, callback);
     } else {
         return std::make_unique<DefaultFileRequest>(resource, callback, *thread);
     }
diff --git a/platform/default/local_file_source.cpp b/platform/default/local_file_source.cpp
new file mode 100644
index 0000000000..5686b453dc
--- /dev/null
+++ b/platform/default/local_file_source.cpp
@@ -0,0 +1,66 @@
+#include <mbgl/storage/local_file_source.hpp>
+#include <mbgl/storage/response.hpp>
+#include <mbgl/util/string.hpp>
+#include <mbgl/util/thread.hpp>
+#include <mbgl/util/url.hpp>
+#include <mbgl/util/util.hpp>
+#include <mbgl/util/io.hpp>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+namespace {
+
+const char* protocol = "file://";
+const std::size_t protocolLength = 7;
+    
+} // namespace
+
+namespace mbgl {
+
+class LocalFileSource::Impl {
+public:
+    void request(const std::string& url, FileSource::Callback callback) {
+        //Cut off the protocol
+        std::string path = mbgl::util::percentDecode(url.substr(protocolLength));
+
+        Response response;
+
+        struct stat buf;
+        int result = stat(path.c_str(), &buf);
+
+        if (result == 0 && S_ISDIR(buf.st_mode)) {
+            response.error = std::make_unique<Response::Error>(Response::Error::Reason::NotFound);
+        } else if (result == -1 && errno == ENOENT) {
+            response.error = std::make_unique<Response::Error>(Response::Error::Reason::NotFound);
+        } else {
+            try {
+                response.data = std::make_shared<std::string>(util::read_file(path));
+            } catch (...) {
+                response.error = std::make_unique<Response::Error>(
+                    Response::Error::Reason::Other,
+                    util::toString(std::current_exception()));
+            }
+        }
+
+        callback(response);
+    }
+
+};
+
+LocalFileSource::LocalFileSource()
+    : thread(std::make_unique<util::Thread<Impl>>(util::ThreadContext{"LocalFileSource", util::ThreadPriority::Low})) {
+}
+
+LocalFileSource::~LocalFileSource() = default;
+
+std::unique_ptr<AsyncRequest> LocalFileSource::request(const Resource& resource, Callback callback) {
+    return thread->invokeWithCallback(&Impl::request, resource.url, callback);
+}
+    
+bool LocalFileSource::acceptsURL(const std::string& url) {
+    return url.compare(0, protocolLength, protocol) == 0;
+}
+
+} // namespace mbgl