1 files changed, 14 insertions, 1 deletions
diff --git a/klm/util/file_piece.hh b/klm/util/file_piece.hh
index 53310976..1b110287 100644
--- a/klm/util/file_piece.hh
+++ b/klm/util/file_piece.hh
@@ -9,6 +9,7 @@
 #include "util/string_piece.hh"
 
 #include <cstddef>
+#include <iosfwd>
 #include <string>
 
 #include <stdint.h>
@@ -31,6 +32,13 @@ class FilePiece {
     // Takes ownership of fd.  name is used for messages.
     explicit FilePiece(int fd, const char *name = NULL, std::ostream *show_progress = NULL, std::size_t min_buffer = 1048576);
 
+    /* Read from an istream.  Don't use this if you can avoid it.  Raw fd IO is
+     * much faster.  But sometimes you just have an istream like Boost's HTTP
+     * server and want to parse it the same way.
+     * name is just used for messages and FileName().
+     */
+    explicit FilePiece(std::istream &stream, const char *name = NULL, std::size_t min_buffer = 1048576);
+
     ~FilePiece();
 
     char get() {
@@ -56,7 +64,10 @@ class FilePiece {
     long int ReadLong();
     unsigned long int ReadULong();
 
-    // Skip spaces defined by isspace.
+    // Fake read() function.  Reads up to limit bytes, returning the amount read.  Returns 0 on EOF || limit == 0. 
+    std::size_t Raw(void *to, std::size_t limit);
+
+    // Skip spaces defined by being in delim.
     void SkipSpaces(const bool *delim = kSpaces) {
       for (; ; ++position_) {
         if (position_ == position_end_) Shift();
@@ -71,6 +82,8 @@ class FilePiece {
     const std::string &FileName() const { return file_name_; }
 
   private:
+    void InitializeNoRead(const char *name, std::size_t min_buffer);
+    // Calls InitializeNoRead, so don't call both.
     void Initialize(const char *name, std::ostream *show_progress, std::size_t min_buffer);
 
     template <class T> T ReadNumber();