X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Fio%2Fmemory.cpp;fp=source%2Fio%2Fmemory.cpp;h=6ea130b54ae134478ab40851f4c49cf1d68ad439;hp=0000000000000000000000000000000000000000;hb=6e0fd758970bcb5bad5e3f2454b694cc4d7b4b66;hpb=b97d4e9f86e90254ab9edef7ee62a910f6333c78

diff --git a/source/io/memory.cpp b/source/io/memory.cpp
new file mode 100644
index 0000000..6ea130b
--- /dev/null
+++ b/source/io/memory.cpp
@@ -0,0 +1,127 @@
+#include <algorithm>
+#include <cstring>
+#include "except.h"
+#include "memory.h"
+
+using namespace std;
+
+namespace Msp {
+namespace IO {
+
+Memory::Memory(char *d, unsigned s)
+{
+	init(d, d+s, M_RDWR);
+}
+
+Memory::Memory(char *b, char *e)
+{
+	init(b, e, M_RDWR);
+}
+
+Memory::Memory(const char *cd, unsigned s)
+{
+	char *d = const_cast<char *>(cd);
+	init(d, d+s, M_READ);
+}
+
+Memory::Memory(const char *b, const char *e)
+{
+	init(const_cast<char *>(b), const_cast<char *>(e), M_READ);
+}
+
+void Memory::init(char *b, char *e, Mode m)
+{
+	begin = b;
+	end = e;
+	pos = begin;
+	mode = m;
+}
+
+unsigned Memory::do_write(const char *buf, unsigned size)
+{
+	check_mode(M_WRITE);
+
+	size = min<unsigned>(size, end-pos);
+	memcpy(pos, buf, size);
+	pos += size;
+	return size;
+}
+
+unsigned Memory::do_read(char *buf, unsigned size)
+{
+	if(pos==end)
+	{
+		eof_flag = true;
+		return 0;
+	}
+
+	size = min<unsigned>(size, end-pos);
+	memcpy(buf, pos, size);
+	pos += size;
+	return size;
+}
+
+unsigned Memory::put(char c)
+{
+	check_mode(M_WRITE);
+	*pos++ = c;
+	return 1;
+}
+
+bool Memory::getline(string &line)
+{
+	char *nl = find(pos, end, '\n');
+	line.assign(pos, nl);
+	bool result = (nl!=pos);
+	pos = nl;
+	return result;
+}
+
+int Memory::get()
+{
+	if(pos==end)
+	{
+		eof_flag = true;
+		return -1;
+	}
+
+	return static_cast<unsigned char>(*pos++);
+}
+
+unsigned Memory::seek(int off, SeekType type)
+{
+	char *new_pos;
+	if(type==S_BEG)
+		new_pos = begin+off;
+	else if(type==S_CUR)
+		new_pos = pos+off;
+	else if(type==S_END)
+		new_pos = end+off;
+	else
+		throw InvalidParameterValue("Invalid seek type");
+
+	if(new_pos<begin || new_pos>end)
+		throw InvalidParameterValue("Invalid seek offset");
+
+	pos = new_pos;
+	return pos-begin;
+}
+
+Handle Memory::get_event_handle()
+{
+	throw Exception("Memory doesn't support events");
+}
+
+void Memory::check_mode(Mode m) const
+{
+	if(m==M_WRITE)
+	{
+		if(!(mode&M_WRITE))
+			throw InvalidState("Memory is not writable");
+		if(pos==end)
+			throw InvalidState("Attempt to write past end of Memory");
+	}
+}
+
+} // namespace IO
+} // namespace Msp