1 files changed, 70 insertions, 0 deletions
diff --git a/lib/trace/trace_file_read.cpp b/lib/trace/trace_file_read.cpp
new file mode 100644
index 00000000..fb303aa8
--- /dev/null
+++ b/lib/trace/trace_file_read.cpp
@@ -0,0 +1,70 @@
+/**************************************************************************
+ *
+ * Copyright 2011 Jose Fonseca
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include <fstream>
+
+#include "os.hpp"
+#include "trace_file.hpp"
+#include "trace_snappy.hpp"
+
+
+using namespace trace;
+
+
+File *
+File::createForRead(const char *filename)
+{
+    std::ifstream stream(filename, std::ifstream::binary | std::ifstream::in);
+    if (!stream.is_open()) {
+        os::log("error: failed to open %s\n", filename);
+        return NULL;
+    }
+    unsigned char byte1, byte2;
+    stream >> byte1;
+    stream >> byte2;
+    stream.close();
+
+    File *file;
+    if (byte1 == SNAPPY_BYTE1 && byte2 == SNAPPY_BYTE2) {
+        file = File::createSnappy();
+    } else if (byte1 == 0x1f && byte2 == 0x8b) {
+        file = File::createZLib();
+    } else  {
+        // XXX: Brotli has no magic header
+        file = File::createBrotli();
+    }
+    if (!file) {
+        return NULL;
+    }
+
+    if (!file->open(filename)) {
+        os::log("error: could not open %s for reading\n", filename);
+        delete file;
+        return NULL;
+    }
+
+    return file;
+}