From 51b84c0c2c3abb0cf7e815c5ae259face40ac977 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 18 Mar 2007 17:04:45 +0000
Subject: [PATCH] Added reset function for StringCodec::Decoder

---
 source/codec.h       | 10 ++++++++--
 source/iso2022jp.cpp |  6 ++++++
 source/iso2022jp.h   |  1 +
 source/jisx0208.cpp  |  4 ++++
 source/jisx0208.h    |  1 +
 source/utf8.cpp      |  5 +++++
 source/utf8.h        |  1 +
 7 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/source/codec.h b/source/codec.h
index d5ba595..5fb29db 100644
--- a/source/codec.h
+++ b/source/codec.h
@@ -91,11 +91,17 @@ public:
 		{ for(std::string::const_iterator i=s.begin(); i!=s.end(); ) decode_char(s, i); }
 
 		/**
-		Ensures that all input has been processed.  An exception is thrown if
-		this is not the case.
+		Ensures that all input has been processed.  If this is not the case any
+		buffers are cleared and an exception is thrown,
 		*/
 		virtual void sync() { }
 
+		/**
+		Resets the decoder, clearing a possibly erroneus state.  Does not flush
+		the internal buffer.
+		*/
+		virtual void reset() { }
+
 		const std::wstring &get() const { return buffer_; }
 		unsigned size() const { return buffer_.size(); }
 		void flush() { buffer_.clear(); }
diff --git a/source/iso2022jp.cpp b/source/iso2022jp.cpp
index 806dca1..ab31456 100644
--- a/source/iso2022jp.cpp
+++ b/source/iso2022jp.cpp
@@ -110,6 +110,12 @@ void Iso2022Jp::Decoder::sync()
 	dec->flush();
 }
 
+void Iso2022Jp::Decoder::reset()
+{
+	switch_mode(ASCII);
+	escape=0;
+}
+
 void Iso2022Jp::Decoder::switch_mode(Mode m)
 {
 	append(dec->get());
diff --git a/source/iso2022jp.h b/source/iso2022jp.h
index ea5209e..8ded0d8 100644
--- a/source/iso2022jp.h
+++ b/source/iso2022jp.h
@@ -33,6 +33,7 @@ public:
 		Decoder();
 		void decode_char(const std::string &, std::string::const_iterator &);
 		void sync();
+		void reset();
 	private:
 		Mode mode;
 		StringCodec::Decoder *dec;
diff --git a/source/jisx0208.cpp b/source/jisx0208.cpp
index 477ccd0..4d46f70 100644
--- a/source/jisx0208.cpp
+++ b/source/jisx0208.cpp
@@ -42,6 +42,10 @@ void JisX0208::Decoder::sync()
 		throw CodecError("Sync in middle of JIS X 0208 character");
 }
 
+void JisX0208::Decoder::reset()
+{
+	high=0;
+}
 
 wchar_t jisx0208_to_ucs(unsigned short jis)
 {
diff --git a/source/jisx0208.h b/source/jisx0208.h
index a81f578..16f8202 100644
--- a/source/jisx0208.h
+++ b/source/jisx0208.h
@@ -19,6 +19,7 @@ public:
 	public:
 		void decode_char(const std::string &, std::string::const_iterator &);
 		void sync();
+		void reset();
 	private:
 		char high;
 	};
diff --git a/source/utf8.cpp b/source/utf8.cpp
index 0217790..f95ad9c 100644
--- a/source/utf8.cpp
+++ b/source/utf8.cpp
@@ -89,4 +89,9 @@ void Utf8::Decoder::sync()
 		throw CodecError("Sync in the middle of multibyte UTF-8 sequence");
 }
 
+void Utf8::Decoder::reset()
+{
+	bytes=0;
+}
+
 } // namespace Msp
diff --git a/source/utf8.h b/source/utf8.h
index 18f9ae5..0475523 100644
--- a/source/utf8.h
+++ b/source/utf8.h
@@ -20,6 +20,7 @@ public:
 		Decoder(): bytes(0), code(0) { }
 		void     decode_char(const std::string &, std::string::const_iterator &);
 		void     sync();
+		void     reset();
 	private:
 		unsigned bytes;
 		unsigned code;
-- 
2.45.2