2 files changed, 58 insertions, 0 deletions
diff --git a/src/common/tests/file_utils.cc b/src/common/tests/file_utils.cc
index 0d9b04ad..1264b078 100644
--- a/src/common/tests/file_utils.cc
+++ b/src/common/tests/file_utils.cc
@@ -40,6 +40,61 @@
 
 namespace google_breakpad {
 
+bool CopyFile(const char* from_path, const char* to_path) {
+  int infile = HANDLE_EINTR(open(from_path, O_RDONLY));
+  if (infile < 0) {
+    perror("open");
+    return false;
+  }
+
+  int outfile = HANDLE_EINTR(creat(to_path, 0666));
+  if (outfile < 0) {
+    perror("creat");
+    if (HANDLE_EINTR(close(infile)) < 0) {
+      perror("close");
+    }
+    return false;
+  }
+
+  char buffer[1024];
+  bool result = true;
+
+  while (result) {
+    ssize_t bytes_read = HANDLE_EINTR(read(infile, buffer, sizeof(buffer)));
+    if (bytes_read < 0) {
+      perror("read");
+      result = false;
+      break;
+    }
+    if (bytes_read == 0)
+      break;
+    ssize_t bytes_written_per_read = 0;
+    do {
+      ssize_t bytes_written_partial = HANDLE_EINTR(write(
+          outfile,
+          &buffer[bytes_written_per_read],
+          bytes_read - bytes_written_per_read));
+      if (bytes_written_partial < 0) {
+        perror("write");
+        result = false;
+        break;
+      }
+      bytes_written_per_read += bytes_written_partial;
+    } while (bytes_written_per_read < bytes_read);
+  }
+
+  if (HANDLE_EINTR(close(infile)) == -1) {
+    perror("close");
+    result = false;
+  }
+  if (HANDLE_EINTR(close(outfile)) == -1) {
+    perror("close");
+    result = false;
+  }
+
+  return result;
+}
+
 bool ReadFile(const char* path, void* buffer, ssize_t* buffer_size) {
   int fd = HANDLE_EINTR(open(path, O_RDONLY));
   if (fd == -1) {
diff --git a/src/common/tests/file_utils.h b/src/common/tests/file_utils.h
index 52e8b009..c98a9bfa 100644
--- a/src/common/tests/file_utils.h
+++ b/src/common/tests/file_utils.h
@@ -35,6 +35,9 @@
 
 namespace google_breakpad {
 
+// Copies a file from |from_path| to |to_path|. Returns true on success.
+bool CopyFile(const char* from_path, const char* to_path);
+
 // Reads the content of a file at |path| into |buffer|. |buffer_size| specifies
 // the size of |buffer| in bytes and returns the number of bytes read from the
 // file on success. Returns true on success.