Reduces the amount of boilerplate neccesary to parse the binary format.

1 files changed, 137 insertions, 0 deletions

diff --git a/binparse/parse.cpp b/binparse/parse.cpp
new file mode 100644
index 0000000..cf7c0be
--- /dev/null
+++ b/binparse/parse.cpp
@@ -0,0 +1,137 @@
+#include "parse.hpp"
+
+namespace binparse {
+
+UnexpectedEOS::UnexpectedEOS()
+: std::runtime_error("Unexpected end of stream.")
+{}
+
+UnexpectedEOS::UnexpectedEOS(std::__cxx11::string location)
+: std::runtime_error("Unexpected end of stream after " + location)
+{}
+
+template<>
+uint8_t parse<uint8_t>(std::istream& is, std::string name) {
+	if(!is) {
+		throw UnexpectedEOS();
+	}
+	char data = 0;
+	is.read(&data, 1);
+	if(!is) {
+		throw UnexpectedEOS(name);
+	}
+	
+	return (unsigned char) data;
+}
+
+template<>
+uint16_t parse<uint16_t>(std::istream& is, std::string name) {
+	if(!is) {
+		throw UnexpectedEOS();
+	}
+	char data[2] = {0, 0};
+	is.read(data, 2);
+	if(!is) {
+		throw UnexpectedEOS(name);
+	}
+	
+	return (
+		  ((unsigned char) data[1]) << 8)
+		| (unsigned char) data[0];
+}
+
+template<>
+uint32_t parse<uint32_t>(std::istream& is, std::string name) {
+	if(!is) {
+		throw UnexpectedEOS();
+	}
+	char data[4] = {0, 0};
+	is.read(data, sizeof(data));
+	if(!is) {
+		throw UnexpectedEOS(name);
+	}
+	
+	return (
+		  ((unsigned char) data[3]) << 24
+		| ((unsigned char) data[2]) << 16
+		| ((unsigned char) data[1]) << 8
+		| ((unsigned char) data[0])
+	);
+}
+
+template<>
+Value8 parse<Value8>(std::istream& is, std::string name) {
+	return Value8(parse<uint8_t>(is, name));
+}
+
+template<>
+Value16 parse<Value16>(std::istream& is, std::string name) {
+	return Value16(parse<uint16_t>(is, name));
+}
+
+template<>
+Magic16 parse<Magic16>(std::istream& is, std::string name) {
+	return Magic16(parse<uint16_t>(is, name));
+}
+
+template<>
+Offset16 parse<Offset16>(std::istream& is, std::string name) {
+	return Offset16(parse<uint16_t>(is, name));
+}
+
+template<>
+Value32 parse<Value32>(std::istream& is, std::string name) {
+	return Value32(parse<uint32_t>(is, name));
+}
+
+template<>
+Offset32 parse<Offset32>(std::istream& is, std::string name) {
+	return Offset32(parse<uint32_t>(is, name));
+}
+
+template<>
+std::array<uint8_t, 8> parse<std::array<uint8_t, 8>>(std::istream& is, std::string name) {
+	if(!is) {
+		throw UnexpectedEOS();
+	}
+	
+	std::array<uint8_t, 8> buffer;
+	is.read(reinterpret_cast<char*>(buffer.data()), buffer.size());
+	
+	if(!is) {
+		throw UnexpectedEOS(name);
+	}
+	
+	return buffer;
+}
+
+template<>
+std::array<uint8_t, 22> parse<std::array<uint8_t, 22>>(std::istream& is, std::string name) {
+	if(!is) {
+		throw UnexpectedEOS();
+	}
+	
+	std::array<uint8_t, 22> buffer;
+	is.read(reinterpret_cast<char*>(buffer.data()), buffer.size());
+	
+	if(!is) {
+		throw UnexpectedEOS(name);
+	}
+	
+	return buffer;
+}
+
+void dump_bytes(std::istream& is, std::vector<uint8_t>& buffer, std::string name)
+{
+	if(!is) {
+		throw UnexpectedEOS();
+	}
+	
+	is.read(reinterpret_cast<char*>(buffer.data()), buffer.size());
+	
+	if(!is) {
+		throw UnexpectedEOS(name);
+	}
+}
+
+}
\ No newline at end of file