Re-organize the Trace::File code.

[apitrace] / common / trace_file_zlib.cpp

diff --git a/common/trace_file_zlib.cpp b/common/trace_file_zlib.cpp
new file mode 100644 (file)
index 0000000..6982c1e
--- /dev/null
+++ b/common/trace_file_zlib.cpp
@@ -0,0 +1,165 @@
+/**************************************************************************
+ *
+ * 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 <assert.h>
+#include <string.h>
+
+#include <zlib.h>
+#include <gzguts.h>
+
+#include "os.hpp"
+
+#include <iostream>
+
+
+using namespace Trace;
+
+
+class ZLibFile : public File {
+public:
+    ZLibFile(const std::string &filename = std::string(),
+             File::Mode mode = File::Read);
+    virtual ~ZLibFile();
+
+
+    virtual bool supportsOffsets() const;
+    virtual File::Offset currentOffset();
+protected:
+    virtual bool rawOpen(const std::string &filename, File::Mode mode);
+    virtual bool rawWrite(const void *buffer, size_t length);
+    virtual bool rawRead(void *buffer, size_t length);
+    virtual int rawGetc();
+    virtual void rawClose();
+    virtual void rawFlush();
+    virtual bool rawSkip(size_t length);
+    virtual int  rawPercentRead();
+private:
+    void *m_gzFile;
+    double m_endOffset;
+};
+
+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_state *state = (gz_state *)m_gzFile;
+        off_t loc = lseek(state->fd, 0, SEEK_CUR);
+        m_endOffset = lseek(state->fd, 0, SEEK_END);
+        lseek(state->fd, 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_state *state = (gz_state *)m_gzFile;
+    return 100 * (lseek(state->fd, 0, SEEK_CUR) / m_endOffset);
+}
+
+
+File * File::createZLib(void) {
+    return new ZLibFile;
+}
+
+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);
+}
+