Fix a bug while expanding the buffer used in cloudsync_payload_encode_step

The bug was detected for payloads >= 500KB

Author: andinux

src/cloudsync.c

@@ -1907,12 +1907,11 @@ bool cloudsync_buffer_check (cloudsync_network_payload *payload, size_t needed)
     // alloc/resize buffer
     if (payload->bused + needed > payload->balloc) {
         if (needed < CLOUDSYNC_PAYLOAD_MINBUF_SIZE) needed = CLOUDSYNC_PAYLOAD_MINBUF_SIZE;
-        size_t balloc = (payload->balloc * 2) + needed;
+        size_t balloc = payload->balloc + needed;
 
-        char *buffer = cloudsync_memory_alloc(balloc);
+        char *buffer = cloudsync_memory_realloc(payload->buffer, balloc);
         if (!buffer) return cloudsync_buffer_free(payload);
 
-        if (payload->buffer) cloudsync_memory_free(payload->buffer);
         payload->buffer = buffer;
         payload->balloc = balloc;
         if (payload->nrows == 0) payload->bused = sizeof(cloudsync_network_header);

src/cloudsync.h

@@ -16,7 +16,7 @@
 #include "sqlite3.h"
 #endif
 
-#define CLOUDSYNC_VERSION                       "0.8.4"
+#define CLOUDSYNC_VERSION                       "0.8.5"
 
 int sqlite3_cloudsync_init (sqlite3 *db, char **pzErrMsg, const sqlite3_api_routines *pApi);