Net: Standardize HttpByteRange printing

net/http/http_byte_range.cc

Index: net/http/http_byte_range.cc
diff --git a/net/http/http_byte_range.cc b/net/http/http_byte_range.cc
index 60683c5584f5578dd0c4e76ce41f4c12341cdacc..0a97eae76b3fdacc81dde747ce6687840f0b8acf 100644
--- a/net/http/http_byte_range.cc
+++ b/net/http/http_byte_range.cc
@@ -4,6 +4,9 @@
 
 #include <algorithm>
 
+#include "base/format_macros.h"
+#include "base/logging.h"
+#include "base/strings/stringprintf.h"
 #include "net/http/http_byte_range.h"
 
 namespace {
@@ -21,6 +24,29 @@ HttpByteRange::HttpByteRange()
       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;
 }
@@ -41,6 +67,21 @@ bool HttpByteRange::IsValid() const {
            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;