From a799bcf05458669595b4e426f37b28566a79fda2 Mon Sep 17 00:00:00 2001
From: Sergey Linev <S.Linev@gsi.de>
Date: Fri, 2 Aug 2024 10:48:01 +0200
Subject: [PATCH] Build with I/O fixes

---
 build/jsroot.js  | 15 ++++++++++-----
 changes.md       |  4 ++++
 modules/core.mjs |  2 +-
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/build/jsroot.js b/build/jsroot.js
index 8bca31002..8ddffed0a 100644
--- a/build/jsroot.js
+++ b/build/jsroot.js
@@ -1,4 +1,4 @@
-// https://root.cern/js/ v7.7.2
+// https://root.cern/js/ v7.7.x
 (function (global, factory) {
 typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 typeof define === 'function' && define.amd ? define(['exports'], factory) :
@@ -7,11 +7,11 @@ typeof define === 'function' && define.amd ? define(['exports'], factory) :
 
 /** @summary version id
   * @desc For the JSROOT release the string in format 'major.minor.patch' like '7.0.0' */
-const version_id = '7.7.2',
+const version_id = '7.7.x',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '19/06/2024',
+version_date = '2/08/2024',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}
@@ -76754,7 +76754,7 @@ let TH2Painter$2 = class TH2Painter extends THistPainter {
                if (draw_colors && (colindx !== null))
                   item.style('fill', this._color_palette.getColor(colindx));
                else if (draw_fill)
-                  item.call('fill', this.createAttFill(gr).func);
+                  item.call(this.createAttFill(gr).func);
                else
                   item.style('fill', 'none');
                if (draw_lines)
@@ -99565,7 +99565,7 @@ class TFile {
      * @private */
    async readKeys() {
       // with the first readbuffer we read bigger amount to create header cache
-      return this.readBuffer([0, 1024]).then(blob => {
+      return this.readBuffer([0, 400]).then(blob => {
          const buf = new TBuffer(blob, 0, this);
          if (buf.substring(0, 4) !== 'root')
             return Promise.reject(Error(`Not a ROOT file ${this.fURL}`));
@@ -99900,6 +99900,11 @@ function readMapElement(buf) {
    }
 
    const n = buf.ntoi4(), res = new Array(n);
+
+   // no extra data written for empty map
+   if (n === 0)
+      return res;
+
    if (this.member_wise && (buf.remain() >= 6)) {
       if (buf.ntoi2() === kStreamedMemberWise)
          buf.shift(4); // skip checksum
diff --git a/changes.md b/changes.md
index 4a1c6eb96..22a8280b1 100644
--- a/changes.md
+++ b/changes.md
@@ -1,5 +1,9 @@
 # JSROOT changelog
 
+## Changes in 7.7.x
+1. Fix - correctly handle in I/O empty std::map
+2. Fix - reading of small (<1KB) ROOT files
+
 
 ## Changes in 7.7.2
 1. Fix - hide empty title on the canvas
diff --git a/modules/core.mjs b/modules/core.mjs
index f4ca0b9b6..0e18cce64 100644
--- a/modules/core.mjs
+++ b/modules/core.mjs
@@ -4,7 +4,7 @@ const version_id = '7.7.x',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '19/06/2024',
+version_date = '2/08/2024',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}