/*
** Compare a blob to a string.  Return TRUE if they are equal.
*/
int blob_eq_str(Blob *pBlob, const char *z, int n){
  Blob t;
  blob_is_init(pBlob);
  if( n<=0 ) n = (int)strlen(z);
  t.aData = (char*)z;
  t.nUsed = n;
  t.xRealloc = blobReallocStatic;
  return blob_compare(pBlob, &t)==0;
}

/*

** pXfer is a "pragma uv-hash HASH" card.
**
** If HASH is different from the unversioned content hash on this server,
** then send a bunch of uvigot cards, one for each entry unversioned file
** on this server.
*/
static void send_unversioned_catalog(Xfer *pXfer){


  int nUvIgot = 0;
  Stmt uvq;
  unversioned_schema();
  db_prepare(&uvq,
     "SELECT name, mtime, hash, sz FROM unversioned"
  );
  while( db_step(&uvq)==SQLITE_ROW ){
    const char *zName = db_column_text(&uvq,0);
    sqlite3_int64 mtime = db_column_int64(&uvq,1);
    const char *zHash = db_column_text(&uvq,2);
    int sz = db_column_int(&uvq,3);
    nUvIgot++;
    if( zHash==0 ){ sz = 0; zHash = "-"; }
    blob_appendf(pXfer->pOut, "uvigot %s %lld %s %d\n",
                 zName, mtime, zHash, sz);
  }
  db_finalize(&uvq);

}

/*
** Called when there is an attempt to transfer private content to and
** from a server without authorization.
*/
static void server_private_xfer_not_authorized(void){

      ** The client wants to make sure that unversioned files are all synced.
      ** If the HASH does not match, send a complete catalog of
      ** "uvigot" cards.
      */
      if( blob_eq(&xfer.aToken[1], "uv-hash")
       && blob_is_hname(&xfer.aToken[2])
      ){
        if( !uvCatalogSent
         && g.perm.Read
         && !blob_eq_str(&xfer.aToken[2], unversioned_content_hash(0),-1)
        ){
          if( g.perm.WrUnver ){
            @ pragma uv-push-ok

          }else if( g.perm.Read ){
            @ pragma uv-pull-only

          }
          send_unversioned_catalog(&xfer);
        }
        uvCatalogSent = 1;
      }

      /*   pragma ci-lock CHECKIN-HASH CLIENT-ID
      **
      ** The client wants to make non-branch commit against the check-in

*/
#define SYNC_PUSH           0x0001    /* push content client to server */
#define SYNC_PULL           0x0002    /* pull content server to client */
#define SYNC_CLONE          0x0004    /* clone the repository */
#define SYNC_PRIVATE        0x0008    /* Also transfer private content */
#define SYNC_VERBOSE        0x0010    /* Extra diagnostics */
#define SYNC_RESYNC         0x0020    /* --verily */
#define SYNC_UVPULL         0x0040    /* Unversioned pull */
#define SYNC_FROMPARENT     0x0080    /* Pull from the parent project */
#define SYNC_UNVERSIONED    0x0100    /* Sync unversioned content */
#define SYNC_UV_REVERT      0x0200    /* Copy server unversioned to client */

#define SYNC_UV_TRACE       0x0400    /* Describe UV activities */
#define SYNC_UV_DRYRUN      0x0800    /* Do not actually exchange files */
#define SYNC_IFABLE         0x1000    /* Inability to sync is not fatal */
#define SYNC_CKIN_LOCK      0x2000    /* Lock the current check-in */
#endif

/*
** Floating-point absolute value
*/
static double fossil_fabs(double x){
  return x>0.0 ? x : -x;

  sqlite3_int64 mtime;    /* Modification time on a UV file */
  int autopushFailed = 0; /* Autopush following commit failed if true */
  const char *zCkinLock;  /* Name of check-in to lock.  NULL for none */
  const char *zClientId;  /* A unique identifier for this check-out */
  unsigned int mHttpFlags;/* Flags for the http_exchange() subsystem */

  if( db_get_boolean("dont-push", 0) ) syncFlags &= ~SYNC_PUSH;
  if( (syncFlags & (SYNC_PUSH|SYNC_PULL|SYNC_CLONE|
                    SYNC_UNVERSIONED|SYNC_UVPULL))==0
     && configRcvMask==0 && configSendMask==0 ) return 0;
  if( syncFlags & SYNC_FROMPARENT ){
    configRcvMask = 0;
    configSendMask = 0;
    syncFlags &= ~(SYNC_PUSH);
    zPCode = db_get("parent-project-code", 0);
    if( zPCode==0 || db_get("parent-project-name",0)==0 ){

      configRcvMask = 0;
    }

    /* Client sends a request to sync unversioned files.
    ** On a clone, delay sending this until the second cycle since
    ** the login card might fail on the first cycle.
    */
    if( (syncFlags & (SYNC_UNVERSIONED|SYNC_UVPULL))!=0
     && ((syncFlags & SYNC_CLONE)==0 || nCycle>0)
     && !uvHashSent
    ){
      blob_appendf(&send, "pragma uv-hash %s\n", unversioned_content_hash(0));
      nCardSent++;
      uvHashSent = 1;
    }

        **
        ** If the server is unwill to accept new unversioned content (because
        ** this client lacks the necessary permissions) then it sends a
        ** "uv-pull-only" pragma so that the client will know not to waste
        ** bandwidth trying to upload unversioned content.  If the server
        ** does accept new unversioned content, it sends "uv-push-ok".
        */
        if( syncFlags & SYNC_UNVERSIONED ){
          if( blob_eq(&xfer.aToken[1], "uv-pull-only") ){
            fossil_print(
              "Warning: uv-pull-only                                       \n"
              "         Unable to push unversioned content because you lack\n"
              "         sufficient permission on the server\n"
            );
            if( syncFlags & SYNC_UV_REVERT ) uvDoPush = 1;
          }else if( blob_eq(&xfer.aToken[1], "uv-push-ok") ){
            uvDoPush = 1;
          }
        }

        /*    pragma ci-lock-fail  USER-HOLDING-LOCK  LOCK-TIME
        **
        ** The server generates this message when a "pragma ci-lock"
        ** is attempted on a check-in for which there is an existing
        ** lock.  USER-HOLDING-LOCK is the name of the user who originated