Fix crashes induces by malformed compressed data

go.mod

@@ -1,4 +1,4 @@
-module github.com/phpdave11/gofpdi
+module github.com/vsenko/gofpdi
 
 go 1.12
 

reader.go

@@ -506,7 +506,10 @@ func (this *PdfReader) resolveCompressedObject(objSpec *PdfValue) (*PdfValue, er
 		// Decompress if filter is /FlateDecode
 		// Uncompress zlib compressed data
 		var out bytes.Buffer
-		zlibReader, _ := zlib.NewReader(bytes.NewBuffer(compressedObj.Stream.Bytes))
+		zlibReader, err := zlib.NewReader(bytes.NewBuffer(compressedObj.Stream.Bytes))
+		if err != nil {
+			return nil, errors.Wrap(err, "Failed to uncompress data")
+		}
 		defer zlibReader.Close()
 		io.Copy(&out, zlibReader)
 
@@ -1422,7 +1425,10 @@ func (this *PdfReader) rebuildContentStream(content *PdfValue) ([]byte, error) {
 		case "/FlateDecode":
 			// Uncompress zlib compressed data
 			var out bytes.Buffer
-			zlibReader, _ := zlib.NewReader(bytes.NewBuffer(stream))
+			zlibReader, err := zlib.NewReader(bytes.NewBuffer(stream))
+			if err != nil {
+				return nil, errors.Wrap(err, "Failed to uncompress data")
+			}
 			defer zlibReader.Close()
 			io.Copy(&out, zlibReader)
 

writer.go

@@ -121,7 +121,7 @@ func (this *PdfWriter) ImportPage(reader *PdfReader, pageno int, boxName string)
 	this.k = 1
 
 	// Get all page boxes
-	pageBoxes, err := reader.getPageBoxes(1, this.k)
+	pageBoxes, err := reader.getPageBoxes(pageno, this.k)
 	if err != nil {
 		return -1, errors.Wrap(err, "Failed to get page boxes")
 	}