Moving mmap to poly, cleaning up devices.

src/poly/mapped_memory_posix.cc

@@ -0,0 +1,77 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <poly/mapped_memory.h>
+
+#include <sys/mman.h>
+#include <cstdio>
+
+#include <poly/string.h>
+
+namespace poly {
+
+class PosixMappedMemory : public MappedMemory {
+ public:
+  PosixMappedMemory(const std::wstring& path, Mode mode)
+      : MappedMemory(path, mode), file_handle(nullptr) {}
+
+  ~PosixMappedMemory() override {
+    if (data_) {
+      munmap(data_, size_);
+    }
+    if (file_handle) {
+      fclose(file_handle);
+    }
+  }
+
+  FILE* file_handle;
+};
+
+std::unique_ptr<MappedMemory> MappedMemory::Open(const std::wstring& path,
+                                                 Mode mode, size_t offset,
+                                                 size_t length) {
+  const char* mode;
+  int prot;
+  switch (mode) {
+    case Mode::READ:
+      mode = "rb";
+      prot = PROT_READ;
+      break;
+    case Mode::READ_WRITE:
+      mode = "r+b";
+      prot = PROT_READ | PROT_WRITE;
+      break;
+  }
+
+  auto mm = std::make_unique<PosixMappedMemory>(path, mode);
+
+  mm->file_handle = fopen(poly::to_string(path).c_str(), mode);
+  if (!mm->file_handle) {
+    return nullptr;
+  }
+
+  size_t map_length;
+  map_length = length;
+  if (!length) {
+    fseeko(mm->file_handle, 0, SEEK_END);
+    map_length = ftello(mm->file_handle);
+    fseeko(mm->file_handle, 0, SEEK_SET);
+  }
+  mm->size_ = map_length;
+
+  mm->data_ =
+      mmap(0, map_length, prot, MAP_SHARED, fileno(mm->file_handle), offset);
+  if (!mm->data_) {
+    return nullptr;
+  }
+
+  return std::move(mm);
+}
+
+}  // namespace poly