Support sending a sliced file in chromium....

net/base/upload_data.h

 // Copyright (c) 2010 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.
 
 #ifndef NET_BASE_UPLOAD_DATA_H_
 #define NET_BASE_UPLOAD_DATA_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/ref_counted.h"
+#include "base/time.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
 namespace net {
 
 class UploadData : public base::RefCounted<UploadData> {
  public:
   UploadData() : identifier_(0) {}
 
   enum Type {
     TYPE_BYTES,
     TYPE_FILE
   };
 
   class Element {
    public:
     Element() : type_(TYPE_BYTES), file_range_offset_(0),
                 file_range_length_(kuint64max),
                 override_content_length_(false) {
     }
 
     Type type() const { return type_; }
     const std::vector<char>& bytes() const { return bytes_; }
     const FilePath& file_path() const { return file_path_; }
     uint64 file_range_offset() const { return file_range_offset_; }
     uint64 file_range_length() const { return file_range_length_; }
+    // If NULL time is returned, we do not do the check.
+    const base::Time& expected_file_modification_time() const {
+      return expected_file_modification_time_;
+    }
 
     void SetToBytes(const char* bytes, int bytes_len) {
       type_ = TYPE_BYTES;
       bytes_.assign(bytes, bytes + bytes_len);
     }
 
     void SetToFilePath(const FilePath& path) {
-      SetToFilePathRange(path, 0, kuint64max);
+      SetToFilePathRange(path, 0, kuint64max, base::Time());
     }
 
+    // If expected_modification_time is NULL, we do not check for the file
+    // change. Also note that the granularity for comparison is time_t, not
+    // the full precision.
     void SetToFilePathRange(const FilePath& path,
-                            uint64 offset, uint64 length) {
+                            uint64 offset, uint64 length,
+                            const base::Time& expected_modification_time) {
       type_ = TYPE_FILE;
       file_path_ = path;
       file_range_offset_ = offset;
       file_range_length_ = length;
+      expected_file_modification_time_ = expected_modification_time;
     }
 
     // Returns the byte-length of the element.  For files that do not exist, 0
     // is returned.  This is done for consistency with Mozilla.
     uint64 GetContentLength() const;
 
    private:
     // Allows tests to override the result of GetContentLength.
     void SetContentLength(uint64 content_length) {
       override_content_length_ = true;
       content_length_ = content_length;
     }
 
     Type type_;
     std::vector<char> bytes_;
     FilePath file_path_;
     uint64 file_range_offset_;
     uint64 file_range_length_;
+    base::Time expected_file_modification_time_;
     bool override_content_length_;
     uint64 content_length_;
 
     FRIEND_TEST(UploadDataStreamTest, FileSmallerThanLength);
     FRIEND_TEST(HttpNetworkTransactionTest, UploadFileSmallerThanLength);
   };
 
   void AppendBytes(const char* bytes, int bytes_len) {
     if (bytes_len > 0) {
       elements_.push_back(Element());
       elements_.back().SetToBytes(bytes, bytes_len);
     }
   }
 
   void AppendFile(const FilePath& file_path) {
     elements_.push_back(Element());
     elements_.back().SetToFilePath(file_path);
   }
 
   void AppendFileRange(const FilePath& file_path,
-                       uint64 offset, uint64 length) {
+                       uint64 offset, uint64 length,
+                       const base::Time& expected_modification_time) {
     elements_.push_back(Element());
-    elements_.back().SetToFilePathRange(file_path, offset, length);
+    elements_.back().SetToFilePathRange(file_path, offset, length,
+                                        expected_modification_time);
   }
 
   // Returns the total size in bytes of the data to upload.
   uint64 GetContentLength() const;
 
   const std::vector<Element>& elements() const {
     return elements_;
   }
 
   void set_elements(const std::vector<Element>& elements) {
@@ skipping 15 matching lines @@
 
   ~UploadData() {}
 
   std::vector<Element> elements_;
   int64 identifier_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_UPLOAD_DATA_H_