dbf - npm Package Compare versions

Comparing version 0.0.0 to 0.0.1

package.json

 {
   "name": "dbf",
-  "version": "0.0.0",
+  "version": "0.0.1",
   "description": "generate dbf files",
   "main": "index.js",
-  "dependencies": {
-    "jdataview": "~2.4.4"
-  },
+  "dependencies": {},
   "devDependencies": {
@@ -10,0 +8,0 @@ "expect.js": "~0.2.0",

README.md

 # dbf
 
-based on https://code.google.com/p/js2shapefile/ but aiming for a full rewrite.
+Create [DBF](http://en.wikipedia.org/wiki/DBASE) database files in pure
+JavaScript.
 
+DBF is a zombie file format kept alive by inclusion in the [Shapefile](http://en.wikipedia.org/wiki/Shapefile)
+file format.
+
 ## usage
@@ -10,2 +14,20 @@
 
+### api
+
+`arraybuffer = dbf.writer(fields, data)`
+
+Fields as objects with
+
+* type: one of
+  * C: String
+  * L: Bool
+  * D: Date
+  * N, M, F, B: Number
+* name: column name
+
+And data is an array of objects that represent rows.
+
+Returns an [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/API/ArrayBuffer)
+of binary data.
+
 ### example
@@ -12,0 +34,0 @@

src/header.js

@@ -28,3 +28,5 @@ var fieldTypes = {
 
-    attributes.forEach(function(attr, i) {
+    attributes.forEach(writeAttribute);
+
+    function writeAttribute(attr, i) {
         var fieldLength = fieldTypes[attr.type](attr);
@@ -34,7 +36,8 @@
 
-        view.setInt8(i * 32 + 11, attr.type.charCodeAt(0));
-        view.setInt8(i * 32 + 16, fieldLength);
+        var i32 = i * 32;
+        view.setInt8(i32 + 11, attr.type.charCodeAt(0));
+        view.setInt8(i32 + 16, fieldLength);
 
         if (attr.type == 'N') {
-            view.setInt8(i * 32 + 17, attr.scale || 0);
+            view.setInt8(i32 + 17, attr.scale || 0);
         }
@@ -44,5 +47,5 @@
         bytesPerRecord += fieldLength;
-    });
+    }
 
-    // mark end of header
+    // end of header
     view.setInt8(fieldDescLength - 1, 13);
@@ -58,10 +61,6 @@
 
-    // var dbfHeaderBlob = new BlobBuilder();
-    // dbfHeaderBlob.append(dbfHeaderView.getBuffer());
-    // dbfHeaderBlob.append(view.getBuffer());
-
     return {
         recordLength: bytesPerRecord,
-        header: headerBuffer,
-        field: buffer
+        header: headerView,
+        field: view
     };
@@ -68,0 +67,0 @@ };

src/record.js

@@ -5,3 +5,3 @@ var lib = require('./lib');
 
-    var dataLength = (recordLength) * rows.length + 1,
+    var dataLength = recordLength * rows.length + 1,
         buffer = new ArrayBuffer(dataLength),
@@ -11,9 +11,8 @@ view = new DataView(buffer),
 
-    rows.forEach(function(row) {
+    rows.forEach(writeRow);
+
+    function writeRow(row) {
+
         view.setUint8(offset, 32);
-        offset += 1;
-        offset = writeRow(row, offset);
-    });
-
-    function writeRow(row, offset) {
+        offset++;
         attributes.forEach(writeAttribute);
@@ -24,4 +23,3 @@
                 fieldLength = attribute.length || 0,
-                val = row[attribute.name] || rownum.toString(),
-                str;
+                val = row[attribute.name] || rownum.toString();
 
@@ -31,3 +29,3 @@ switch (dataType) {
                     view.setUint8(offset, val ? 84 : 70);
-                    offset += 1;
+                    offset++;
                     break;
@@ -53,4 +51,2 @@
         }
-
-        return offset;
     }
@@ -60,3 +56,3 @@
 
-    return buffer;
+    return view;
 };

src/writer.js

@@ -1,23 +0,21 @@
-var fs = require('fs'),
-    record = require('./record'),
+var record = require('./record'),
     header = require('./header');
 
 module.exports = function write(fields, data) {
-    var headData = header(fields);
-    var rowData = record(fields, data, headData.recordLength);
-    var out = fs.createWriteStream('foo.dbf');
-    fs.writeFileSync('foo.dbf', Buffer.concat([
-        toBuffer(headData.header),
-        toBuffer(headData.field),
-        toBuffer(rowData)
-    ]));
+    var head = header(fields),
+        row = record(fields, data, head.recordLength);
+
+    return combine(combine(head.header, head.field), row);
 };
 
-function toBuffer(ab) {
-    var buffer = new Buffer(ab.byteLength);
-    var view = new Uint8Array(ab);
-    for (var i = 0; i < buffer.length; ++i) {
-        buffer[i] = view[i];
+function combine(a, b) {
+    var c = new ArrayBuffer(a.byteLength + b.byteLength),
+        d = new DataView(c);
+    for (var i = 0; i < a.byteLength; i++) {
+        d.setUint8(i, a.getUint8(i));
     }
-    return buffer;
+    for (; i < a.byteLength + b.byteLength; i++) {
+        d.setUint8(i, b.getUint8(i - a.byteLength));
+    }
+    return d;
 }

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Improved metrics

Total package byte prevSize

8422

increased by5.3%

Dependency count

0

decreased by-100%

Lines of code

207

increased by0.49%

Number of lines in readme file

50

increased by78.57%

Dependency changes

• - Removedjdataview@~2.4.4

• - Removedjdataview@2.4.6(transitive)