X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbinaryparser.cpp;h=7d1591de77105264a3d59fc2506c4bd0c03a9739;hb=2d289d20a9a4aeac7774976e4213a7c72f1dc75b;hp=53131289a851b04270e377e8abb5b61b49832b5c;hpb=5fd2c13c3036ea6a767802fdc9a2ab809ef8ec17;p=libs%2Fdatafile.git

diff --git a/source/binaryparser.cpp b/source/binaryparser.cpp
index 5313128..7d1591d 100644
--- a/source/binaryparser.cpp
+++ b/source/binaryparser.cpp
@@ -1,7 +1,9 @@
+#include <limits>
 #include <sys/param.h>
 #include <msp/core/maputils.h>
 #include <msp/strings/format.h>
 #include "binaryparser.h"
+#include "binfloat.h"
 #include "input.h"
 
 using namespace std;
@@ -22,59 +24,71 @@ public:
 
 BinaryParser::BinaryParser(Input &i, const string &s):
 	ParserMode(i, s),
-	first(true)
+	first(true),
+	float_precision(32)
 {
-	dict[1] = DictEntry("__kwd", "iss");
-	dict[2] = DictEntry("__str", "is");
+	dict[-1] = StatementKey("__kwd", "iss");
+	dict[-2] = StatementKey("__str", "is");
+	dict[-3] = StatementKey("__flt", "i");
 }
 
-Statement BinaryParser::parse()
+Statement BinaryParser::parse(bool raw)
 {
 	while(1)
 	{
-		Statement st = parse_statement();
+		Statement st = parse_statement(raw);
 		if(st.keyword=="__kwd")
 		{
-			if(st.args.size()!=3)
+			int id = st.args[0].get<int>();
+			if(id<=0)
 				throw bad_definition("__kwd");
 
-			const unsigned id = st.args[0].get<unsigned>();
 			const string &kw = st.args[1].get<const string &>();
 			const string &args = st.args[2].get<const string &>();
-			dict[id] = DictEntry(kw, args);
+			for(string::const_iterator i=args.begin(); i!=args.end(); ++i)
+				for(unsigned j=0; valid_signatures[j]!=*i; ++j)
+					if(!valid_signatures[j])
+						throw bad_definition("__kwd");
+
+			dict[id] = StatementKey(kw, args);
 		}
 		else if(st.keyword=="__str")
 		{
-			if(st.args.size()!=2)
+			int id = st.args[0].get<int>();
+			if(id<=0)
 				throw bad_definition("__str");
 
-			const unsigned id = st.args[0].get<unsigned>();
 			strings[id] = st.args[1].get<const string &>();
 		}
+		else if(st.keyword=="__flt")
+			float_precision = st.args[0].get<unsigned>();
 		else
 			return st;
+
+		if(raw)
+			return st;
 	}
 }
 
-Statement BinaryParser::parse_statement()
+Statement BinaryParser::parse_statement(bool raw)
 {
 	while(first && in.peek()=='\n')
 		in.get();
 	first = false;
 
-	unsigned id = parse_int();
+	int id = parse_int();
 	if(!in)
 		return Statement();
 
-	const DictEntry &de = get_item(dict, id);
+	const StatementKey &key = get_item(dict, id);
 
 	Statement result;
-	result.keyword = de.keyword;
+	result.keyword = key.keyword;
 	result.source = src;
 
-	for(unsigned j = 0; j<de.args.size(); ++j)
+	for(unsigned j=0; j<key.signature.size(); ++j)
 	{
-		switch(de.args[j])
+		switch(key.signature[j])
 		{
 		case IntType::signature:
 			result.args.push_back(parse_int());
@@ -96,7 +110,7 @@ Statement BinaryParser::parse_statement()
 
 	unsigned nsub = parse_int();
 	for(unsigned j = 0; j<nsub; ++j)
-		result.sub.push_back(parse());
+		result.sub.push_back(parse(raw));
 
 	result.valid = true;
 
@@ -127,21 +141,47 @@ IntType::Store BinaryParser::parse_int()
 
 FloatType::Store BinaryParser::parse_float()
 {
-	union
+	UInt64 encoded = 0;
+	for(unsigned i=0; i<float_precision; i+=8)
 	{
-		float f;
-		char d[sizeof(float)];
-	};
-
-#if BYTE_ORDER == LITTLE_ENDIAN
-	for(unsigned i = sizeof(float); i--;)
-		d[i] = in.get();
-#else
-	for(unsigned i = 0; i<sizeof(float); ++i)
-		d[i] = in.get();
-#endif
-
-	return f;
+		int c = in.get();
+		encoded = (encoded<<8) | (c&0xFF);
+	}
+
+	BinFloat bf = BinFloat::explode(encoded, float_precision);
+
+	if(numeric_limits<FloatType::Store>::is_iec559)
+		return bf.compose_iec559<FloatType::Store>();
+	else
+	{
+		/* Put the float together with arithmetic since we don't know its
+		internal layout */
+		FloatType::Store f = 0;
+		if(bf.infinity)
+		{
+			if(numeric_limits<FloatType::Store>::has_infinity)
+				f = numeric_limits<FloatType::Store>::infinity();
+			else
+				f = numeric_limits<FloatType::Store>::max();
+		}
+		else
+		{
+			for(unsigned i=0; i<64; ++i)
+			{
+				f /= 2;
+				if(bf.mantissa&1)
+					f += 1;
+				bf.mantissa >>= 1;
+			}
+			for(int i=0; i<bf.exponent; ++i)
+				f *= 2;
+			for(int i=0; i>bf.exponent; --i)
+				f /= 2;
+		}
+		if(bf.sign)
+			f = -f;
+		return f;
+	}
 }
 
 BoolType::Store BinaryParser::parse_bool()