Add basic function to get shared library information.

Signed-off-by: aixxe <me@aixxe.net>

src/Utilities/Linker.cpp

@@ -0,0 +1,49 @@
+#include <vector>
+#include <link.h>
+#include <string.h>
+
+#include "Linker.h"
+
+struct dlinfo_t {
+	// Full path to shared library on filesystem.
+	const char* library = nullptr;
+
+	// Absolute 'start address' in memory.
+	uintptr_t address = 0;
+
+	// Size in memory - accuracy is questionable.
+	size_t size = 0;
+};
+
+std::vector<dlinfo_t> libraries;
+
+bool Linker::GetLibraryInformation(const char* library, uintptr_t* address, size_t* size) {
+	if (libraries.size() == 0) {
+		dl_iterate_phdr([] (struct dl_phdr_info* info, size_t, void*) {
+			dlinfo_t library_info = {};
+			
+			library_info.library = info->dlpi_name;
+			library_info.address = info->dlpi_addr + info->dlpi_phdr[0].p_vaddr;
+			library_info.size = info->dlpi_phdr[0].p_memsz;
+			
+			libraries.push_back(library_info);
+
+			return 0;
+		}, nullptr);
+	}
+
+	for (const dlinfo_t& current: libraries) {
+		if (!strcasestr(current.library, library))
+			continue;
+
+		if (address)
+			*address = current.address;
+
+		if (size)
+			*size = current.size;
+
+		return true;
+	}
+
+	return false;
+}

src/Utilities/Linker.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace Linker {
+	// Iterate loaded shared libraries and optionally return base address and size.
+	bool GetLibraryInformation(const char*, uintptr_t* = nullptr, size_t* = nullptr);
+}