Net: Standardize HttpByteRange printing

net/http/http_byte_range.cc

 // Copyright (c) 2009 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 <algorithm>
 
+#include "base/format_macros.h"
+#include "base/logging.h"
+#include "base/strings/stringprintf.h"
 #include "net/http/http_byte_range.h"
 
 namespace {
 
 const int64 kPositionNotSpecified = -1;
 
 }  // namespace
 
 namespace net {
 
 HttpByteRange::HttpByteRange()
     : first_byte_position_(kPositionNotSpecified),
       last_byte_position_(kPositionNotSpecified),
       suffix_length_(kPositionNotSpecified),
       has_computed_bounds_(false) {
 }
 
+// static
+HttpByteRange HttpByteRange::Bounded(int64 first_byte_position,
+                                     int64 last_byte_position) {
+  HttpByteRange range;
+  range.set_first_byte_position(first_byte_position);
+  range.set_last_byte_position(last_byte_position);
+  return range;
+}
+
+// static
+HttpByteRange HttpByteRange::RightUnbounded(int64 first_byte_position) {
+  HttpByteRange range;
+  range.set_first_byte_position(first_byte_position);
+  return range;
+}
+
+// static
+HttpByteRange HttpByteRange::Suffix(int64 suffix_length) {
+  HttpByteRange range;
+  range.set_suffix_length(suffix_length);
+  return range;
+}
+
 bool HttpByteRange::IsSuffixByteRange() const {
   return suffix_length_ != kPositionNotSpecified;
 }
 
 bool HttpByteRange::HasFirstBytePosition() const {
   return first_byte_position_ != kPositionNotSpecified;
 }
 
 bool HttpByteRange::HasLastBytePosition() const {
   return last_byte_position_ != kPositionNotSpecified;
 }
 
 bool HttpByteRange::IsValid() const {
   if (suffix_length_ > 0)
     return true;
   return (first_byte_position_ >= 0 &&
           (last_byte_position_ == kPositionNotSpecified ||
            last_byte_position_ >= first_byte_position_));
 }
 
+std::string HttpByteRange::PrintHeader() const {
+  DCHECK(IsValid());
+
+  if (IsSuffixByteRange()) {
+    return base::StringPrintf("bytes=-%" PRId64, suffix_length());
+  } else if (HasLastBytePosition()) {
+    DCHECK(HasFirstBytePosition());
+    return base::StringPrintf("bytes=%" PRId64 "-%" PRId64,
+                              first_byte_position(), last_byte_position());
+  } else {
+    DCHECK(HasFirstBytePosition());
+    return base::StringPrintf("bytes=%" PRId64 "-", first_byte_position());
+  }
+}
+
 bool HttpByteRange::ComputeBounds(int64 size) {
   if (size < 0)
     return false;
   if (has_computed_bounds_)
     return false;
   has_computed_bounds_ = true;
 
   // Empty values.
   if (!HasFirstBytePosition() &&
       !HasLastBytePosition() &&
@@ skipping 13 matching lines @@
     if (HasLastBytePosition())
       last_byte_position_ = std::min(size - 1, last_byte_position_);
     else
       last_byte_position_ = size - 1;
     return true;
   }
   return false;
 }
 
 }  // namespace net