1 files changed, 296 insertions, 26 deletions
diff --git a/wx+/serialize.h b/wx+/serialize.h
index f49bff04..030b55c7 100644
--- a/wx+/serialize.h
+++ b/wx+/serialize.h
@@ -8,14 +8,306 @@
 #define SERIALIZE_H_INCLUDED
 
 #include <cstdint>
-#include <wx/stream.h>
+#include <zen/string_base.h>
 #include <zen/file_io.h>
 
+#ifdef FFS_WIN
+warn_static("get rid of wx, then move to zen")
+#endif
+
+#include <wx/stream.h>
+
 
 namespace zen
 {
+//high-performance unformatted serialization (avoiding wxMemoryOutputStream/wxMemoryInputStream inefficiencies)
+
+/*
+--------------------------
+|Binary Container Concept|
+--------------------------
+binary container for data storage: must support "basic" std::vector interface (e.g. std::vector<char>, std::string, Zbase<char>)
+*/
+
+//binary container reference implementations
+typedef Zbase<char> Utf8String; //ref-counted + COW text stream + guaranteed performance: exponential growth
+class BinaryStream;             //ref-counted       byte stream + guaranteed performance: exponential growth -> no COW, but 12% faster than Utf8String (due to no null-termination?)
+
+class BinaryStream //essentially a std::vector<char> with ref-counted semantics
+{
+public:
+    BinaryStream() : buffer(std::make_shared<std::vector<char>>()) {}
+
+    typedef std::vector<char>::value_type value_type;
+    typedef std::vector<char>::iterator iterator;
+    typedef std::vector<char>::const_iterator const_iterator;
+
+    iterator begin() { return buffer->begin(); }
+    iterator end  () { return buffer->end  (); }
+
+    const_iterator begin() const { return buffer->begin(); }
+    const_iterator end  () const { return buffer->end  (); }
+
+    void resize(size_t len) { buffer->resize(len); }
+    size_t size() const { return buffer->size(); }
+    bool empty() const { return buffer->empty(); }
+
+    inline friend bool operator==(const BinaryStream& lhs, const BinaryStream& rhs) { return *lhs.buffer == *rhs.buffer; }
+
+private:
+    std::shared_ptr<std::vector<char>> buffer; //always bound!
+    //perf: shared_ptr indirection irrelevant: less than 1% slower!
+};
+
+//----------------------------------------------------------------------
+//functions based on binary container abstraction
+template <class BinContainer>         void saveBinStream(const Zstring& filename, const BinContainer& cont); //throw FileError
+template <class BinContainer> BinContainer loadBinStream(const Zstring& filename); //throw FileError, ErrorNotExisting
+
+
+/*
+-----------------------------
+|Binary Input Stream Concept|
+-----------------------------
+struct BinInputStream
+{
+    const void* requestRead(size_t len); //expect external read of len bytes
+};
+
+------------------------------
+|Binary Output Stream Concept|
+------------------------------
+struct BinOutputStream
+{
+    void* requestWrite(size_t len); //expect external write of len bytes
+};
+*/
+
+//binary input/output stream reference implementation
+class UnexpectedEndOfStreamError {};
+
+struct BinStreamIn //throw UnexpectedEndOfStreamError
+{
+    BinStreamIn(const BinaryStream& cont) : buffer(cont), pos(0) {} //this better be cheap!
+
+    const void* requestRead(size_t len) //throw UnexpectedEndOfStreamError
+    {
+        if (pos + len > buffer.size())
+            throw UnexpectedEndOfStreamError();
+        size_t oldPos = pos;
+        pos += len;
+        return &*buffer.begin() + oldPos;
+    }
+
+private:
+    const BinaryStream buffer;
+    size_t pos;
+};
+
+struct BinStreamOut
+{
+    void* requestWrite(size_t len)
+    {
+        size_t oldSize = buffer.size();
+        buffer.resize(buffer.size() + len);
+        return &*buffer.begin() + oldSize;
+    }
+
+    BinaryStream get() { return buffer; }
+
+private:
+    BinaryStream buffer;
+};
+
+//----------------------------------------------------------------------
+//functions based on binary stream abstraction
+template <class N, class BinOutputStream> void writeNumber   (BinOutputStream& stream, const N& num);                 //
+template <class C, class BinOutputStream> void writeContainer(BinOutputStream& stream, const C& str);                 //throw ()
+template <         class BinOutputStream> void writeArray    (BinOutputStream& stream, const void* data, size_t len); //
+
+//----------------------------------------------------------------------
+
+template <class N, class BinInputStream> N    readNumber   (BinInputStream& stream); //
+template <class C, class BinInputStream> C    readContainer(BinInputStream& stream); //throw UnexpectedEndOfStreamError (corrupted data)
+template <         class BinInputStream> void readArray    (BinInputStream& stream, void* data, size_t len); //
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+//-----------------------implementation-------------------------------
+template <class BinContainer> inline
+void saveBinStream(const Zstring& filename, const BinContainer& cont) //throw FileError
+{
+    assert_static(sizeof(typename BinContainer::value_type) == 1); //expect: bytes (until further)
+
+    FileOutput fileOut(filename, zen::FileOutput::ACC_OVERWRITE); //throw FileError
+    if (!cont.empty())
+        fileOut.write(&*cont.begin(), cont.size()); //throw FileError
+}
+
+
+template <class BinContainer> inline
+BinContainer loadBinStream(const Zstring& filename) //throw FileError, ErrorNotExisting
+{
+    assert_static(sizeof(typename BinContainer::value_type) == 1); //expect: bytes (until further)
+
+    FileInput fileIn(filename); //throw FileError, ErrorNotExisting
+
+    BinContainer contOut;
+    const size_t blockSize = 64 * 1024;
+    do
+    {
+        contOut.resize(contOut.size() + blockSize);
+
+        const size_t bytesRead = fileIn.read(&*contOut.begin() + contOut.size() - blockSize, blockSize); //throw FileError
+        if (bytesRead < blockSize)
+            contOut.resize(contOut.size() - (blockSize - bytesRead)); //caveat: unsigned arithmetics
+    }
+    while (!fileIn.eof());
+
+    return contOut;
+}
+
+
+template <class BinOutputStream> inline
+void writeArray(BinOutputStream& stream, const void* data, size_t len)
+{
+    std::copy(static_cast<const char*>(data),
+              static_cast<const char*>(data) + len,
+              static_cast<      char*>(stream.requestWrite(len)));
+}
+
+
+template <class N, class BinOutputStream> inline
+void writeNumber(BinOutputStream& stream, const N& num)
+{
+    assert_static((IsArithmetic<N>::value || IsSameType<N, bool>::value));
+    writeArray(stream, &num, sizeof(N));
+}
+
+
+template <class C, class BinOutputStream> inline
+void writeContainer(BinOutputStream& stream, const C& cont) //don't even consider UTF8 conversions here! "string" is expected to handle arbitrary binary data!
+{
+    const auto len = cont.size();
+    writeNumber(stream, static_cast<std::uint32_t>(len));
+    if (len > 0)
+        writeArray(stream, &*cont.begin(), sizeof(typename C::value_type) * len); //don't use c_str(), but access uniformly via STL interface
+}
+
+
+template <class BinInputStream> inline
+void readArray(BinInputStream& stream, void* data, size_t len)
+{
+    const char* const src = static_cast<const char*>(stream.requestRead(len)); //expect external write of len bytes
+    std::copy(src, src + len, static_cast<char*>(data));
+}
+
+
+template <class N, class BinInputStream> inline
+N readNumber(BinInputStream& stream)
+{
+    assert_static((IsArithmetic<N>::value || IsSameType<N, bool>::value));
+    N num = 0;
+    readArray(stream, &num, sizeof(N));
+    return num;
+}
+
+
+template <class C, class BinInputStream> inline
+C readContainer(BinInputStream& stream)
+{
+    C cont;
+    auto strLength = readNumber<std::uint32_t>(stream);
+    if (strLength > 0)
+        try
+        {
+            cont.resize(strLength); //throw std::bad_alloc
+            readArray(stream, &*cont.begin(), sizeof(typename C::value_type) * strLength);
+        }
+        catch (std::bad_alloc&) //most likely this is due to data corruption!
+        {
+            throw UnexpectedEndOfStreamError();
+        }
+    return cont;
+}
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+#ifdef FFS_WIN
+warn_static("get rid of wx, then move to zen")
+#endif
+
+
+
 //unchecked, unformatted serialization
-template <class T> T readPOD (wxInputStream&  stream);
+template <class T> T    readPOD (wxInputStream&  stream);
 template <class T> void readPOD (wxInputStream&  stream, T& pod);
 template <class T> void writePOD(wxOutputStream& stream, const T& pod);
 
@@ -116,29 +408,6 @@ private:
 };
 
 
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-//-----------------------implementation-------------------------------
 template <class T> inline
 T readPOD(wxInputStream& stream)
 {
@@ -235,7 +504,7 @@ void CheckedReader::readString(S& str) const //checked read operation
     }
     catch (std::exception&) { throwException(); }
     check();
-    if (stream_.LastRead() != str.length() * sizeof(typename S::value_type)) //some additional check
+    if (stream_.LastRead() != str.size() * sizeof(typename S::value_type)) //some additional check
         throwException();
 }
 
@@ -260,6 +529,7 @@ void CheckedWriter::writeString(const S& str) const //checked write operation
 {
     zen::writeString(stream_, str);
     check();
+    //warn_static("buggy check if length 0!")
     if (stream_.LastWrite() != str.length() * sizeof(typename S::value_type)) //some additional check
         throwException();
 }