Merge pull request #232 from kevincharm/feature/handle-callback-err

Handle callback error in readAsTextAsync & check CRC

adm-zip.js

@@ -113,7 +113,12 @@ module.exports = function (/*String*/input) {
 		readAsTextAsync: function (/*Object*/entry, /*Function*/callback, /*String - Optional*/encoding) {
 			var item = getEntry(entry);
 			if (item) {
-				item.getDataAsync(function (data) {
+				item.getDataAsync(function (data, err) {
+					if (err) {
+						callback(data, err);
+						return;
+					}
+
 					if (data && data.length) {
 						callback(data.toString(encoding || "utf8"));
 					} else {
@@ -470,8 +475,12 @@ module.exports = function (/*String*/input) {
 						callback(undefined);
 					return;
 				}
-				entry.getDataAsync(function (content) {
+				entry.getDataAsync(function (content, err) {
 					if (i <= 0) return;
+					if (err) {
+						callback(new Error(err));
+						return;
+					}
 					if (!content) {
 						i = 0;
 						callback(new Error(Utils.Errors.CANT_EXTRACT_FILE));

test/crc/index.js

@@ -0,0 +1,44 @@
+;(function () {
+    var assert = require('assert');
+    var path = require('path');
+    var Zip = require('../../adm-zip');
+
+    testGoodCrc();
+    testBadCrc();
+
+    // Good CRC
+    function testGoodCrc() {
+        var goodZip = new Zip(path.join(__dirname, 'good_crc.zip'));
+        var entries = goodZip.getEntries();
+        assert(entries.length === 1, 'Good CRC: Test archive contains exactly 1 file');
+
+        var testFile = entries.filter(function (entry) {
+            return entry.entryName === 'lorem_ipsum.txt';
+        });
+        assert(testFile.length === 1, 'Good CRC: lorem_ipsum.txt file exists as archive entry');
+
+        var testFileEntryName = testFile[0].entryName;
+        goodZip.readAsTextAsync(testFileEntryName, function (data, err) {
+            assert(!err, 'Good CRC: error object not present');
+            assert(data && data.length, 'Good CRC: buffer not empty');
+        });
+    }
+
+    // Bad CRC
+    function testBadCrc() {
+        var badZip = new Zip(path.join(__dirname, 'bad_crc.zip'));
+        var entries = badZip.getEntries();
+        assert(entries.length === 1, 'Bad CRC: Test archive contains exactly 1 file');
+
+        var testFile = entries.filter(function (entry) {
+            return entry.entryName === 'lorem_ipsum.txt';
+        });
+        assert(testFile.length === 1, 'Bad CRC: lorem_ipsum.txt file exists as archive entry');
+
+        var testFileEntryName = testFile[0].entryName;
+        badZip.readAsTextAsync(testFileEntryName, function (data, err) {
+            assert(data && data.length, 'Bad CRC: buffer not empty');
+            assert(err, 'Bad CRC: error object present');
+        });
+    }
+})();

zipEntry.js

@@ -23,7 +23,7 @@ module.exports = function (/*Buffer*/input) {
     function crc32OK(data) {
         // if bit 3 (0x08) of the general-purpose flags field is set, then the CRC-32 and file sizes are not known when the header is written
         if ((_entryHeader.flags & 0x8) !== 0x8) {
-           if (Utils.crc32(data) !== _entryHeader.crc) {
+           if (Utils.crc32(data) !== _entryHeader.dataHeader.crc) {
                return false;
            }
         } else {