Add the zorder.c extension implementing zorder() and unzorder() SQL functions.

FossilOrigin-Name: a57a77dc0cc9fbaa9d5b134422f7a8cc8d4c2851ed3c2bdd449800c6a5d2aae0

ext/misc/zorder.c

@@ -0,0 +1,102 @@
+/*
+** 2018-02-09
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** SQL functions for z-order (Morton code) transformations.
+**
+**      zorder(X0,X0,..,xN)      Generate an N+1 dimension Morton code
+**
+**      unzorder(Z,N,I)          Extract the I-th dimension from N-dimensional
+**                               Morton code Z.
+*/
+#include "sqlite3ext.h"
+SQLITE_EXTENSION_INIT1
+#include <assert.h>
+#include <string.h>
+
+/*
+** Functions:     zorder(X0,X1,....)
+**
+** Convert integers X0, X1, ... into morton code.
+**
+** The output is a signed 64-bit integer.  If any argument is too large,
+** an error is thrown.
+*/
+static void zorderFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  sqlite3_int64 z, x[63];
+  int i, j;
+  z = 0;
+  for(i=0; i<argc; i++){
+    x[i] = sqlite3_value_int64(argv[i]);
+  }
+  if( argc>0 ){
+    for(i=0; i<63; i++){
+      j = i%argc;
+      z |= (x[j]&1)<<i;
+      x[j] >>= 1;
+    }
+  }
+  sqlite3_result_int64(context, z);
+  for(i=0; i<argc; i++){
+    if( x[i] ){
+      sqlite3_result_error(context, "parameter too large", -1);
+    }
+  }
+}
+
+
+/*
+** Functions:     unzorder(Z,N,I)
+**
+** Assuming that Z is an N-dimensional Morton code, extract the I-th
+** dimension.
+*/
+static void unzorderFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  sqlite3_int64 z, n, i, x;
+  int j, k;
+  z = sqlite3_value_int64(argv[0]);
+  n = sqlite3_value_int64(argv[1]);
+  i = sqlite3_value_int64(argv[2]);
+  x = 0;
+  for(k=0, j=i; j<63; j+=n, k++){
+    x |= ((z>>j)&1)<<k;
+  }
+  sqlite3_result_int64(context, x);
+}
+
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int sqlite3_zorder_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  rc = sqlite3_create_function(db, "zorder", -1, SQLITE_UTF8, 0,
+                               zorderFunc, 0, 0);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "unzorder", 3, SQLITE_UTF8, 0,
+                               unzorderFunc, 0, 0);
+  }
+  return rc;
+}

manifest

@@ -1,5 +1,5 @@
-C Make\sthe\stests\sin\sfunc6.test\smore\srobust\sagainst\simplementation\schanges.
-D 2018-02-09T15:42:40.632
+C Add\sthe\szorder.c\sextension\simplementing\szorder()\sand\sunzorder()\sSQL\sfunctions.
+D 2018-02-09T20:49:15.905
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@@ -305,6 +305,7 @@ F ext/misc/vtablog.c 31d0d8f4406795679dcd3a67917c213d3a2a5fb3ea5de35f6e773491ed7
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 F ext/misc/zipfile.c 3c3e21d0351a44c34c67ca7e833ba04e0de34421b4c9359aa764919ee36b37ef
+F ext/misc/zorder.c b0ff58fa643afa1d846786d51ea8d5c4b6b35aa0254ab5a82617db92f3adda64
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manifest.uuid

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