1 files changed, 144 insertions, 0 deletions
diff --git a/lib/trace/trace_file_zlib.cpp b/lib/trace/trace_file_zlib.cpp
new file mode 100644
index 00000000..f0dd4560
--- /dev/null
+++ b/lib/trace/trace_file_zlib.cpp
@@ -0,0 +1,144 @@
+/**************************************************************************
+ *
+ * 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 <fcntl.h>
+#ifdef _WIN32
+#include <io.h>
+#else
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#include "os.hpp"
+
+#include <iostream>
+
+
+using namespace trace;
+
+
+class ZLibFile : public File {
+public:
+    ZLibFile(void);
+    virtual ~ZLibFile();
+
+protected:
+    virtual bool rawOpen(const char *filename) override;
+    virtual size_t rawRead(void *buffer, size_t length) override;
+    virtual int rawGetc(void) override;
+    virtual void rawClose(void) override;
+    virtual bool rawSkip(size_t length) override;
+    virtual int  rawPercentRead(void) override;
+private:
+    int fd = 0;
+    gzFile m_gzFile = nullptr;
+    off_t m_endOffset = 0;
+};
+
+ZLibFile::ZLibFile(void)
+{
+}
+
+ZLibFile::~ZLibFile()
+{
+    close();
+}
+
+bool ZLibFile::rawOpen(const char *filename)
+{
+    int flags = O_RDONLY;
+#ifdef O_BINARY
+    flags |= O_BINARY;
+#endif
+#ifdef O_LARGEFILE
+    flags |= O_LARGEFILE;
+#endif
+
+#ifdef _WIN32
+    fd = _open(filename, flags, 0666);
+#else
+    fd = ::open(filename, flags, 0666);
+#endif
+    if (fd < 0) {
+        return false;
+    }
+
+    m_gzFile = gzdopen(fd, "rb");
+
+    if (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);
+        off_t loc = lseek(fd, 0, SEEK_CUR);
+        m_endOffset = lseek(fd, 0, SEEK_END);
+        lseek(fd, loc, SEEK_SET);
+    }
+
+    return m_gzFile != NULL;
+}
+
+size_t ZLibFile::rawRead(void *buffer, size_t length)
+{
+    int ret = gzread(m_gzFile, buffer, unsigned(length));
+    return ret < 0 ? 0 : ret;
+}
+
+int ZLibFile::rawGetc()
+{
+    return gzgetc(m_gzFile);
+}
+
+void ZLibFile::rawClose()
+{
+    if (m_gzFile) {
+        gzclose(m_gzFile);
+        m_gzFile = NULL;
+    }
+}
+
+bool ZLibFile::rawSkip(size_t)
+{
+    return false;
+}
+
+int ZLibFile::rawPercentRead(void)
+{
+    return int(100 * (lseek(fd, 0, SEEK_CUR) / m_endOffset));
+}
+
+
+File * File::createZLib(void) {
+    return new ZLibFile;
+}