X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=trace_file.cpp;h=f48c1aa9189c8b04c23a92448afc5b51ddd9d216;hb=8f98c3a529e7ef88e4111ef22cf8411916a9a065;hp=81b5d03c1f3f273f972f7b8b3d9db8be22f53336;hpb=94194a24eaa9f559b9140a89433f0d3ab3b77ef3;p=apitrace

diff --git a/trace_file.cpp b/trace_file.cpp
index 81b5d03..f48c1aa 100644
--- a/trace_file.cpp
+++ b/trace_file.cpp
@@ -42,12 +42,11 @@ using namespace Trace;
 
 File::File(const std::string &filename,
            File::Mode mode)
-    : m_filename(filename),
-      m_mode(mode),
+    : m_mode(mode),
       m_isOpened(false)
 {
-    if (!m_filename.empty()) {
-        open(m_filename, m_mode);
+    if (!filename.empty()) {
+        open(filename, m_mode);
     }
 }
 
@@ -56,6 +55,12 @@ 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(),
@@ -87,6 +92,12 @@ bool File::isSnappyCompressed(const std::string &filename)
     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)
@@ -103,6 +114,19 @@ 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;
 }
 
@@ -133,3 +157,24 @@ 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);
+}