ByteRange::Kind

src/server/byte_range.h

@@ -25,15 +25,37 @@ namespace kiwix {
 
 class ByteRange
 {
-  public: // functions
-    ByteRange() : ByteRange(0, -1) {}
-    ByteRange(int64_t first, int64_t last) : first_(first), last_(last) {}
+  public: // types
+    enum Kind {
+      // No byte-range was present in the request
+      NONE,
 
+      // This byte-range has been parsed from request
+      PARSED,
+
+      // This is a response to a regular request
+      RESOLVED_FULL_CONTENT,
+
+      // This is a response to a range request
+      RESOLVED_PARTIAL_CONTENT
+    };
+
+  public: // functions
+    ByteRange() : kind_(NONE), first_(0), last_(-1) {}
+
+    ByteRange(Kind kind, int64_t first, int64_t last)
+      : kind_(kind)
+      , first_(first)
+      , last_(last)
+    {}
+
+    Kind kind() const { return kind_; }
     int64_t first() const { return first_; }
     int64_t last() const { return last_; }
     int64_t length() const { return last_ + 1 - first_; }
 
   private: // data
+    Kind kind_;
     int64_t first_;
     int64_t last_;
 };

src/server/request_context.cpp

@@ -64,7 +64,7 @@ fullURL2LocalURL(const std::string& full_url, const std::string& rootLocation)
 
 ByteRange parse_byte_range(std::string range)
 {
-  ByteRange byteRange{0, -1};
+  ByteRange byteRange;
   const std::string byteUnitSpec("bytes=");
   if ( kiwix::startsWith(range, byteUnitSpec) ) {
     range.erase(0, byteUnitSpec.size());
@@ -81,7 +81,7 @@ ByteRange parse_byte_range(std::string range)
         end = -1;
       }
       if (iss.eof()) {
-        byteRange = ByteRange(start, end);
+        byteRange = ByteRange(ByteRange::PARSED, start, end);
       }
     }
   }
@@ -197,7 +197,7 @@ bool RequestContext::is_valid_url() const {
 }
 
 bool RequestContext::has_range() const {
-  return byteRange_.first() <= byteRange_.last();
+  return byteRange_.kind() == ByteRange::PARSED;
 }
 
 ByteRange RequestContext::get_range() const {

src/server/response.cpp

@@ -42,10 +42,14 @@ bool is_compressible_mime_type(const std::string& mimeType)
 ByteRange resolve_byte_range(const kiwix::Entry& entry, ByteRange range)
 {
   const int64_t entrySize = entry.getSize();
+
+  if ( range.kind() == ByteRange::NONE )
+    return ByteRange(ByteRange::RESOLVED_FULL_CONTENT, 0, entrySize-1);
+
   const int64_t resolved_last = range.last() < 0
                               ? entrySize - 1
                               : std::min(entrySize-1, range.last());
-  return ByteRange(range.first(), resolved_last);
+  return ByteRange(ByteRange::RESOLVED_PARTIAL_CONTENT, range.first(), resolved_last);
 }
 
 } // unnamed namespace
@@ -288,7 +292,7 @@ int Response::send(const RequestContext& request, MHD_Connection* connection)
   if ( ! etag.empty() )
       MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etag.c_str());
 
-  if (m_returnCode == MHD_HTTP_OK && request.has_range())
+  if (m_returnCode == MHD_HTTP_OK && m_byteRange.kind() == ByteRange::RESOLVED_PARTIAL_CONTENT)
     m_returnCode = MHD_HTTP_PARTIAL_CONTENT;
 
   if (m_verbose)
@@ -322,6 +326,8 @@ void Response::set_entry(const Entry& entry, const RequestContext& request) {
   set_mimeType(mimeType);
   set_cacheable();
 
+  // XXX: Which of the Accept-Encoding and Range headers has precedence if both
+  // XXX: are present? Can partial content be compressed?
   if ( is_compressible_mime_type(mimeType) ) {
     zim::Blob raw_content = entry.getBlob();
     const std::string content = string(raw_content.data(), raw_content.size());