From b6d455a02bd338e9dc0faa09d4d8177ecd8d569a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Mr=C3=A1zek?= <peterix@gmail.com>
Date: Sun, 10 Apr 2016 15:53:05 +0200
Subject: NOISSUE reorganize and document libraries

---
 libraries/classparser/src/classfile.h | 156 ++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 libraries/classparser/src/classfile.h

(limited to 'libraries/classparser/src/classfile.h')

diff --git a/libraries/classparser/src/classfile.h b/libraries/classparser/src/classfile.h
new file mode 100644
index 00000000..a5e7ee50
--- /dev/null
+++ b/libraries/classparser/src/classfile.h
@@ -0,0 +1,156 @@
+#pragma once
+#include "membuffer.h"
+#include "constants.h"
+#include "annotations.h"
+#include <map>
+namespace java
+{
+/**
+ * Class representing a Java .class file
+ */
+class classfile : public util::membuffer
+{
+public:
+	classfile(char *data, std::size_t size) : membuffer(data, size)
+	{
+		valid = false;
+		is_synthetic = false;
+		read_be(magic);
+		if (magic != 0xCAFEBABE)
+			throw new classfile_exception();
+		read_be(minor_version);
+		read_be(major_version);
+		constants.load(*this);
+		read_be(access_flags);
+		read_be(this_class);
+		read_be(super_class);
+
+		// Interfaces
+		uint16_t iface_count = 0;
+		read_be(iface_count);
+		while (iface_count)
+		{
+			uint16_t iface;
+			read_be(iface);
+			interfaces.push_back(iface);
+			iface_count--;
+		}
+
+		// Fields
+		// read fields (and attributes from inside fields) (and possible inner classes. yay for
+		// recursion!)
+		// for now though, we will ignore all attributes
+		/*
+		 * field_info
+		 * {
+		 * 	u2 access_flags;
+		 * 	u2 name_index;
+		 * 	u2 descriptor_index;
+		 * 	u2 attributes_count;
+		 * 	attribute_info attributes[attributes_count];
+		 * }
+		 */
+		uint16_t field_count = 0;
+		read_be(field_count);
+		while (field_count)
+		{
+			// skip field stuff
+			skip(6);
+			// and skip field attributes
+			uint16_t attr_count = 0;
+			read_be(attr_count);
+			while (attr_count)
+			{
+				skip(2);
+				uint32_t attr_length = 0;
+				read_be(attr_length);
+				skip(attr_length);
+				attr_count--;
+			}
+			field_count--;
+		}
+
+		// class methods
+		/*
+		 * method_info
+		 * {
+		 * 	u2 access_flags;
+		 * 	u2 name_index;
+		 * 	u2 descriptor_index;
+		 * 	u2 attributes_count;
+		 * 	attribute_info attributes[attributes_count];
+		 * }
+		 */
+		uint16_t method_count = 0;
+		read_be(method_count);
+		while (method_count)
+		{
+			skip(6);
+			// and skip method attributes
+			uint16_t attr_count = 0;
+			read_be(attr_count);
+			while (attr_count)
+			{
+				skip(2);
+				uint32_t attr_length = 0;
+				read_be(attr_length);
+				skip(attr_length);
+				attr_count--;
+			}
+			method_count--;
+		}
+
+		// class attributes
+		// there are many kinds of attributes. this is just the generic wrapper structure.
+		// type is decided by attribute name. extensions to the standard are *possible*
+		// class annotations are one kind of a attribute (one per class)
+		/*
+		 * attribute_info
+		 * {
+		 * 	u2 attribute_name_index;
+		 * 	u4 attribute_length;
+		 * 	u1 info[attribute_length];
+		 * }
+		 */
+		uint16_t class_attr_count = 0;
+		read_be(class_attr_count);
+		while (class_attr_count)
+		{
+			uint16_t name_idx = 0;
+			read_be(name_idx);
+			uint32_t attr_length = 0;
+			read_be(attr_length);
+
+			auto name = constants[name_idx];
+			if (name.str_data == "RuntimeVisibleAnnotations")
+			{
+				uint16_t num_annotations = 0;
+				read_be(num_annotations);
+				while (num_annotations)
+				{
+					visible_class_annotations.push_back(annotation::read(*this, constants));
+					num_annotations--;
+				}
+			}
+			else
+				skip(attr_length);
+			class_attr_count--;
+		}
+		valid = true;
+	}
+	;
+	bool valid;
+	bool is_synthetic;
+	uint32_t magic;
+	uint16_t minor_version;
+	uint16_t major_version;
+	constant_pool constants;
+	uint16_t access_flags;
+	uint16_t this_class;
+	uint16_t super_class;
+	// interfaces this class implements ? must be. investigate.
+	std::vector<uint16_t> interfaces;
+	// FIXME: doesn't free up memory on delete
+	java::annotation_table visible_class_annotations;
+};
+}
\ No newline at end of file
-- 
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