Fix debug assert when input lenght is unknown (0)

Author: gustingonzalez

headers/codecs.h

@@ -53,6 +53,10 @@ class IntegerCODEC {
    * of the variable nvalue gets updated with the number actually use
    * (if nvalue exceeds the original value, there might be a buffer
    * overrun).
+   *
+   * NOTE: Decoding can be performed with an unknown input length. This
+   * case is indicated by a length of 0; however, nvalue must be provided
+   * in order for the decoder knows how many values to decode.
    */
   virtual const uint32_t *decodeArray(const uint32_t *in, const size_t length,
                                       uint32_t *out, size_t &nvalue) = 0;

headers/simple16.h

@@ -745,7 +745,7 @@ const uint32_t *Simple16<MarkLength>::decodeArray(const uint32_t *in,
     printf("simple16 stats[%u]=%f\n", k, stats[k] * 1.0 / sum);
   }
 #endif
-  ASSERT(in <= endin, std::to_string(in - endin));
+  ASSERT(len == 0 || in <= endin, std::to_string(in - endin));
   return in;
 }
 

headers/simple8b.h

@@ -637,9 +637,9 @@ const uint32_t *Simple8b<MarkLength>::decodeArray(const uint32_t *in,
     printf("simple8b stats[%u]=%f\n", k, stats[k] * 1.0 / sum);
   }
 #endif
-  assert(in64 <= finalin64);
+  assert(len == 0 || in64 <= finalin64);
   in = reinterpret_cast<const uint32_t *>(in64);
-  assert(in <= endin);
+  assert(len == 0 || in <= endin);
   // check that we don't overrun the buffer too much?
   ASSERT(out < end + 240, std::to_string(out - end));
   nvalue = MarkLength ? actualvalue : out - initout;