From 47a656c0b6fdba8f91f2c5808234cbb1de682652 Mon Sep 17 00:00:00 2001
From: redpony <redpony@ec762483-ff6d-05da-a07a-a48fb63a330f>
Date: Wed, 10 Nov 2010 02:02:04 +0000
Subject: new version of klm

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@706 ec762483-ff6d-05da-a07a-a48fb63a330f
---
 klm/util/file_piece.hh | 51 ++++++++++++++++++++++++++++++++++----------------
 1 file changed, 35 insertions(+), 16 deletions(-)

(limited to 'klm/util/file_piece.hh')

diff --git a/klm/util/file_piece.hh b/klm/util/file_piece.hh
index 704f0ac6..11d4a751 100644
--- a/klm/util/file_piece.hh
+++ b/klm/util/file_piece.hh
@@ -11,6 +11,8 @@
 
 #include <cstddef>
 
+#define HAVE_ZLIB
+
 namespace util {
 
 class EndOfFileException : public Exception {
@@ -25,6 +27,13 @@ class ParseNumberException : public Exception {
     ~ParseNumberException() throw() {}
 };
 
+class GZException : public Exception {
+  public:
+    explicit GZException(void *file);
+    GZException() throw() {}
+    ~GZException() throw() {}
+};
+
 int OpenReadOrThrow(const char *name);
 
 // Return value for SizeFile when it can't size properly.  
@@ -34,40 +43,42 @@ off_t SizeFile(int fd);
 class FilePiece {
   public:
     // 32 MB default.
-    explicit FilePiece(const char *file, std::ostream *show_progress = NULL, off_t min_buffer = 33554432);
+    explicit FilePiece(const char *file, std::ostream *show_progress = NULL, off_t min_buffer = 33554432) throw(GZException);
     // Takes ownership of fd.  name is used for messages.  
-    explicit FilePiece(const char *name, int fd, std::ostream *show_progress = NULL, off_t min_buffer = 33554432);
+    explicit FilePiece(int fd, const char *name, std::ostream *show_progress = NULL, off_t min_buffer = 33554432) throw(GZException);
+
+    ~FilePiece();
      
-    char get() throw(EndOfFileException) { 
-      if (position_ == position_end_) Shift();
+    char get() throw(GZException, EndOfFileException) { 
+      if (position_ == position_end_) {
+        Shift();
+        if (at_end_) throw EndOfFileException();
+      }
       return *(position_++);
     }
 
     // Memory backing the returned StringPiece may vanish on the next call.  
     // Leaves the delimiter, if any, to be returned by get().
-    StringPiece ReadDelimited() throw(EndOfFileException) {
+    StringPiece ReadDelimited() throw(GZException, EndOfFileException) {
       SkipSpaces();
       return Consume(FindDelimiterOrEOF());
     }
     // Unlike ReadDelimited, this includes leading spaces and consumes the delimiter.
     // It is similar to getline in that way.  
-    StringPiece ReadLine(char delim = '\n') throw(EndOfFileException);
+    StringPiece ReadLine(char delim = '\n') throw(GZException, EndOfFileException);
 
-    float ReadFloat() throw(EndOfFileException, ParseNumberException);
+    float ReadFloat() throw(GZException, EndOfFileException, ParseNumberException);
 
-    void SkipSpaces() throw (EndOfFileException);
+    void SkipSpaces() throw (GZException, EndOfFileException);
 
     off_t Offset() const {
       return position_ - data_.begin() + mapped_offset_;
     }
 
-    // Only for testing.  
-    void ForceFallbackToRead() {
-      fallback_to_read_ = true;
-    }
+    const std::string &FileName() const { return file_name_; }
     
   private:
-    void Initialize(const char *name, std::ostream *show_progress, off_t min_buffer);
+    void Initialize(const char *name, std::ostream *show_progress, off_t min_buffer) throw(GZException);
 
     StringPiece Consume(const char *to) {
       StringPiece ret(position_, to - position_);
@@ -75,12 +86,14 @@ class FilePiece {
       return ret;
     }
 
-    const char *FindDelimiterOrEOF() throw(EndOfFileException);
+    const char *FindDelimiterOrEOF() throw(EndOfFileException, GZException);
 
-    void Shift() throw (EndOfFileException);
+    void Shift() throw (EndOfFileException, GZException);
     // Backends to Shift().
     void MMapShift(off_t desired_begin) throw ();
-    void ReadShift(off_t desired_begin) throw ();
+
+    void TransitionToRead() throw (GZException);
+    void ReadShift() throw (GZException, EndOfFileException);
 
     const char *position_, *last_space_, *position_end_;
 
@@ -98,6 +111,12 @@ class FilePiece {
     bool fallback_to_read_;
 
     ErsatzProgress progress_;
+
+    std::string file_name_;
+
+#ifdef HAVE_ZLIB
+    void *gz_file_;
+#endif // HAVE_ZLIB
 };
 
 } // namespace util
-- 
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