Merge pull request #168 from matthiaslueken/feature/empty-files

Check for empty file when computing hash

Author: nvarscar

internal/classes/DBOps.class.ps1

@@ -1093,6 +1093,8 @@ class DBOpsFile : DBOps {
     [void] RebuildHash() {
         if ($this.Length -gt 0) {
             $this.Hash = [DBOpsHelper]::ToHexString([Security.Cryptography.HashAlgorithm]::Create("MD5").ComputeHash($this.ByteArray))
+        } else {
+            $this.ThrowException("Hash cannot be computed, file is empty: $($this.Name)", 'InvalidData')
         }
     }
     #Verify that hash is valid

tests/common/DBOpsFile.class.Tests.ps1

@@ -154,6 +154,10 @@ Describe "DBOpsFile class tests" -Tag UnitTests {
             $file.RebuildHash()
             $file.Hash | Should -Be $oldHash
         }
+        It "should test RebuildHash method with empty file" {
+            $emptyFile = New-Item $workFolder\emptyfile.sql -ItemType File
+            { [DBOpsFile]::new($emptyFile, 'emptyfile.sql', $true) } | Should -Throw
+        }
         It "should test ValidateHash method" {
             $hash = $file.Hash
             { $file.ValidateHash('foo') } | Should -Throw 'File cannot be loaded, hash mismatch*'