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-rw-r--r--java/classfile.h153
1 files changed, 153 insertions, 0 deletions
diff --git a/java/classfile.h b/java/classfile.h
new file mode 100644
index 00000000..33207e99
--- /dev/null
+++ b/java/classfile.h
@@ -0,0 +1,153 @@
+#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