Decompression

jazz-soft · Oct 26, 2024 · ca850f8 · ca850f8
1 parent 1225cfb
commit ca850f8
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Showing 4 changed files with 64 additions and 11 deletions.
diff --git a/jazz-mxml.js b/jazz-mxml.js
@@ -14,6 +14,7 @@ function MXML(s) {
 MXML.prototype.isValid = function() { return !!this.xml; };
 MXML.prototype.isPartwise = function() { return this.isValid() && !!this.xml['score-partwise']; };
 MXML.prototype.isTimewise = function() { return this.isValid() && !!this.xml['score-timewise']; };
+MXML.prototype.isOpus = function() { return this.isValid() && !!this.xml['opus']; };
 MXML.prototype.part2time = function() {};
 MXML.prototype.time2part = MXML.prototype.part2time;
 MXML.prototype.format = function () { return builder.build(this.xml); };
@@ -43,10 +44,46 @@ function dos2date(n) {
 function date2dos(d) {
   return (d.getSeconds() >> 1) + (d.getMinutes() << 5) + (d.getHours() << 11) + (d.getDate() << 16) + ((d.getMonth() + 1) << 21) + ((d.getFullYear() - 1980) << 25);
 }
+const meta_inf = 'META-INF/container.xml';
+MXML.zipInfo = function(data) {
+  const inf = zipInfo(data);
+  if (inf) {
+    var a = [];
+    for (var k of inf.FFF) a.push({ name: k, size: inf.FF[k].size, date: inf.FF[k].date });
+    return a;
+  }
+}
 MXML.unzip = function(data) {
-  var i, k, m, n, s;
+  const inf = zipInfo(data);
+  if (!inf) return;
+  var FF = inf.FF;
+  var FFF = inf.FFF;
+  var a, k, s, s0, s1, s2, x;
+  if (FF[meta_inf]) {
+    a = [];
+    x = parse(decompress(data, FF[meta_inf]));
+    traverse(x, find('rootfile', function(x) { if (x['@_full-path']) a.push(x['@_full-path']); }));
+    if (a.length) FFF = a;
+  }
+  for (k of FFF) {
+    if (k == meta_inf) continue;
+    s = decompress(data, FF[k]);
+    if (!s) continue;
+    s = String(s);
+    if (!s0) s0 = s;
+    x = parse(s);
+    if (!x) continue;
+    if (!s1) s1 = s;
+    if (x['score-partwise'] || x['score-timewise']) return s;
+    if (x['opus'] && !s2) s2 = s;
+  }
+  return s2 || s1 || s0;
+}
+function zipInfo(data) {
+  var i, m, n;
   var nrec, fnlen, exlen, cmlen, fname;
   var FF = {};
+  var FFF = [];
   i = data.length > 65557 ? data.length - 65557 : 0;
   for (n = data.length - 22; n >= i; n--) if (data[n] == 80 && data[n + 1] == 75 && data[n + 2] == 5 && data[n + 3] == 6) break;
   if (n < i) return;
@@ -66,18 +103,11 @@ MXML.unzip = function(data) {
       console.log('bad zip file');
       return;
     }
-    FF[fname] = { off: m + 30 + n2(data, m + 26) + n2(data, m + 28), len: n4(data, m + 18), comp: n2(data, m + 8) };
+    FFF.push(fname);
+    FF[fname] = { off: m + 30 + n2(data, m + 26) + n2(data, m + 28), len: n4(data, m + 18), size: n4(data, m + 22), date: dos2date(n4(data, m + 10)), comp: n2(data, m + 8) };
     n += 46 + fnlen + exlen + cmlen;
   }
-  k = Object.keys(FF);
-  if (FF['META-INF/container.xml']) {
-    s = decompress(data, FF['META-INF/container.xml']);
-//console.log(s);
-  }
-  else {
-    s = k[0];
-  }
-  if (FF[s]) return decompress(data, FF[s]);
+  if (FFF.length) return { FFF: FFF, FF: FF };
 }
 function decompress(data, x) {
   var b = data.subarray(x.off, x.off + x.len);
@@ -98,5 +128,24 @@ function decompress(data, x) {
     console.log('compression method not supported:', x.comp);
   }
 }
+function parse(xml) {
+  try {
+    if (FXP.XMLValidator.validate(xml) == true) return parser.parse(xml);
+  }
+  catch (e) {/**/}
+}
+function traverse(x, f) {
+  if (Array.isArray(x)) for (var y of x) traverse(y, f);
+  if (typeof x != 'object') return; 
+  f(x);
+  for (var k of Object.keys(x)) traverse(x[k], f);
+}
+function find(n, f) {
+  return function(x) {
+    x = x[n];
+    if (Array.isArray(x)) for (var y of x) f(y);
+    else if (typeof x == 'object') f(x);
+  };
+}
 
 module.exports = MXML;
diff --git a/specs.js b/specs.js
diff --git a/specs/specs.js b/specs/specs.js
@@ -3,6 +3,7 @@ const {XMLParser, XMLBuilder} = require('fast-xml-parser');
 
 var i;
 var body = [];
+body.push("const mxlm_xsd = '" + read_xml('musicxml.xsd') + "';");
 body.push("const p2t_xsl = '" + read_xml('parttime.xsl') + "';");
 body.push("const t2p_xsl = '" + read_xml('timepart.xsl') + "';");
 

diff --git a/specs/specs.txt b/specs/specs.txt
@@ -1,5 +1,6 @@
 <BODY>
 module.exports = {
+  mxml_xsd: mxml_xsd,
   p2t_xsl: p2t_xsl,
   t2p_xsl: t2p_xsl
 };