1 files changed, 83 insertions, 0 deletions
diff --git a/printing/page_number.cc b/printing/page_number.cc
new file mode 100644
index 0000000..8e92870
--- /dev/null
+++ b/printing/page_number.cc
@@ -0,0 +1,83 @@
+// Copyright (c) 2006-2008 The Chromium 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 "printing/page_number.h"
+
+#include <limits>
+
+#include "base/logging.h"
+#include "printing/print_settings.h"
+
+namespace printing {
+
+PageNumber::PageNumber(const PrintSettings& settings, int document_page_count) {
+  Init(settings, document_page_count);
+}
+
+PageNumber::PageNumber()
+    : ranges_(NULL),
+      page_number_(-1),
+      page_range_index_(-1),
+      document_page_count_(0) {
+}
+
+void PageNumber::operator=(const PageNumber& other) {
+  ranges_ = other.ranges_;
+  page_number_ = other.page_number_;
+  page_range_index_ = other.page_range_index_;
+  document_page_count_ = other.document_page_count_;
+}
+
+void PageNumber::Init(const PrintSettings& settings, int document_page_count) {
+  DCHECK(document_page_count);
+  ranges_ = settings.ranges.empty() ? NULL : &settings.ranges;
+  document_page_count_ = document_page_count;
+  if (ranges_) {
+    page_range_index_ = 0;
+    page_number_ = (*ranges_)[0].from;
+  } else {
+    if (document_page_count) {
+      page_number_ = 0;
+    } else {
+      page_number_ = -1;
+    }
+    page_range_index_ = -1;
+  }
+}
+
+int PageNumber::operator++() {
+  if (!ranges_) {
+    // Switch to next page.
+    if (++page_number_ == document_page_count_) {
+      // Finished.
+      *this = npos();
+    }
+  } else {
+    // Switch to next page.
+    ++page_number_;
+    // Page ranges are inclusive.
+    if (page_number_ > (*ranges_)[page_range_index_].to) {
+      DCHECK(ranges_->size() <= static_cast<size_t>(
+          std::numeric_limits<int>::max()));
+      if (++page_range_index_ == static_cast<int>(ranges_->size())) {
+        // Finished.
+        *this = npos();
+      } else {
+        page_number_ = (*ranges_)[page_range_index_].from;
+      }
+    }
+  }
+  return ToInt();
+}
+
+bool PageNumber::operator==(const PageNumber& other) const {
+  return page_number_ == other.page_number_ &&
+         page_range_index_ == other.page_range_index_;
+}
+bool PageNumber::operator!=(const PageNumber& other) const {
+  return page_number_ != other.page_number_ ||
+         page_range_index_ != other.page_range_index_;
+}
+
+}  // namespace printing