1 files changed, 180 insertions, 0 deletions
diff --git a/common/trace_file.cpp b/common/trace_file.cpp
new file mode 100644
index 0000000..f48c1aa
--- /dev/null
+++ b/common/trace_file.cpp
@@ -0,0 +1,180 @@
+/**************************************************************************
+ *
+ * Copyright 2011 Zack Rusin
+ * 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 "trace_file.hpp"
+
+#include "trace_snappyfile.hpp"
+
+#include <assert.h>
+#include <string.h>
+
+#include <zlib.h>
+
+#include "os.hpp"
+
+#include <iostream>
+
+using namespace Trace;
+
+
+File::File(const std::string &filename,
+           File::Mode mode)
+    : m_mode(mode),
+      m_isOpened(false)
+{
+    if (!filename.empty()) {
+        open(filename, m_mode);
+    }
+}
+
+File::~File()
+{
+    close();
+}
+
+
+void File::setCurrentOffset(const File::Offset &offset)
+{
+    assert(0);
+}
+
+bool File::isZLibCompressed(const std::string &filename)
+{
+    std::fstream stream(filename.c_str(),
+                        std::fstream::binary | std::fstream::in);
+    if (!stream.is_open())
+        return false;
+
+    unsigned char byte1, byte2;
+    stream >> byte1;
+    stream >> byte2;
+    stream.close();
+
+    return (byte1 == 0x1f && byte2 == 0x8b);
+}
+
+
+bool File::isSnappyCompressed(const std::string &filename)
+{
+    std::fstream stream(filename.c_str(),
+                        std::fstream::binary | std::fstream::in);
+    if (!stream.is_open())
+        return false;
+
+    unsigned char byte1, byte2;
+    stream >> byte1;
+    stream >> byte2;
+    stream.close();
+
+    return (byte1 == SNAPPY_BYTE1 && byte2 == SNAPPY_BYTE2);
+}
+
+typedef struct gz_stream {
+    z_stream stream;
+    int      z_err;   /* error code for last stream operation */
+    int      z_eof;   /* set if end of input file */
+    FILE     *file;   /* .gz file */
+} gz_dummy_stream;
+
+ZLibFile::ZLibFile(const std::string &filename,
+                   File::Mode mode)
+    : File(filename, mode),
+      m_gzFile(NULL)
+{
+}
+
+ZLibFile::~ZLibFile()
+{
+}
+
+bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
+{
+    m_gzFile = gzopen(filename.c_str(),
+                      (mode == File::Write) ? "wb" : "rb");
+
+    if (mode == File::Read && m_gzFile) {
+        //XXX: unfortunately zlib doesn't support
+        //     SEEK_END or we could've done:
+        //m_endOffset = gzseek(m_gzFile, 0, SEEK_END);
+        //gzrewind(m_gzFile);
+        gz_dummy_stream *stream = (gz_dummy_stream *)m_gzFile;
+        long loc = ftell(stream->file);
+        fseek(stream->file,0,SEEK_END);
+        m_endOffset = ftell(stream->file);
+        fseek(stream->file, loc, SEEK_SET);
+    }
+
+    return m_gzFile != NULL;
+}
+
+bool ZLibFile::rawWrite(const void *buffer, size_t length)
+{
+    return gzwrite(m_gzFile, buffer, length) != -1;
+}
+
+bool ZLibFile::rawRead(void *buffer, size_t length)
+{
+    return gzread(m_gzFile, buffer, length) != -1;
+}
+
+int ZLibFile::rawGetc()
+{
+    return gzgetc(m_gzFile);
+}
+
+void ZLibFile::rawClose()
+{
+    if (m_gzFile) {
+        gzclose(m_gzFile);
+        m_gzFile = NULL;
+    }
+}
+
+void ZLibFile::rawFlush()
+{
+    gzflush(m_gzFile, Z_SYNC_FLUSH);
+}
+
+File::Offset ZLibFile::currentOffset()
+{
+    return File::Offset(gztell(m_gzFile));
+}
+
+bool ZLibFile::supportsOffsets() const
+{
+    return false;
+}
+
+bool ZLibFile::rawSkip(size_t)
+{
+    return false;
+}
+
+int ZLibFile::rawPercentRead()
+{
+    gz_dummy_stream *stream = (gz_dummy_stream *)m_gzFile;
+    return 100 * (ftell(stream->file) / m_endOffset);
+}