Diff from hg rev 0b098ca44de7

1 files changed, 53 insertions, 0 deletions

diff --git a/lib/Wrap/file_wrapper_input.cpp b/lib/Wrap/file_wrapper_input.cpp
new file mode 100644
index 0000000000..fc592e0246
--- /dev/null
+++ b/lib/Wrap/file_wrapper_input.cpp
@@ -0,0 +1,53 @@
+/* Copyright 2012 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can
+ * be found in the LICENSE file.
+ */
+
+#include <sys/stat.h>
+#include <stdlib.h>
+
+#include "llvm/Wrap/file_wrapper_input.h"
+
+FileWrapperInput::FileWrapperInput(const std::string& name) :
+    _name(name), _at_eof(false), _size_found(false), _size(0) {
+  _file = fopen(name.c_str(), "rb");
+  if (NULL == _file) {
+    fprintf(stderr, "Unable to open: %s\n", name.c_str());
+    exit(1);
+  }
+}
+
+FileWrapperInput::~FileWrapperInput() {
+  fclose(_file);
+}
+
+size_t FileWrapperInput::Read(uint8_t* buffer, size_t wanted) {
+  size_t found = fread((char*) buffer, 1, wanted, _file);
+  if (feof(_file) || ferror(_file)) {
+    _at_eof = true;
+  }
+  return found;
+}
+
+bool FileWrapperInput::AtEof() {
+  return _at_eof;
+}
+
+off_t FileWrapperInput::Size() {
+  if (_size_found) return _size;
+  struct stat st;
+  if (0 == stat(_name.c_str(), &st)) {
+    _size_found = true;
+    _size = st.st_size;
+    return _size;
+  } else {
+    fprintf(stderr, "Unable to compute file size: %s\n", _name.c_str());
+    exit(1);
+  }
+  // NOT REACHABLE.
+  return 0;
+}
+
+bool FileWrapperInput::Seek(uint32_t pos) {
+  return 0 == fseek(_file, (long) pos, SEEK_SET);
+}