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);
}
}
}
-File::Offset File::currentOffset()
-{
- return File::Offset();
-}
-
void File::setCurrentOffset(const File::Offset &offset)
{
+ assert(0);
}
bool File::isZLibCompressed(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)
{
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;
}
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(unsigned)
+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);
+}