ean 8 integration passes

src/oned/ean_8_reader.rs

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+/*
+ * Copyright 2008 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use super::OneDReader;
+use crate::{BarcodeFormat, Exceptions};
+use one_d_reader_derive::{EANReader, OneDReader};
+
+use super::upc_ean_reader;
+use super::UPCEANReader;
+
+/**
+ * <p>Implements decoding of the EAN-8 format.</p>
+ *
+ * @author Sean Owen
+ */
+#[derive(OneDReader, EANReader)]
+pub struct EAN8Reader;
+
+impl UPCEANReader for EAN8Reader {
+    fn getBarcodeFormat(&self) -> crate::BarcodeFormat {
+        BarcodeFormat::EAN_8
+    }
+
+    fn decodeMiddle(
+        &self,
+        row: &crate::common::BitArray,
+        startRange: &[usize; 2],
+        resultString: &mut String,
+    ) -> Result<usize, Exceptions> {
+        let mut counters = [0_u32; 4]; //decodeMiddleCounters;
+                                   // counters[0] = 0;
+                                   // counters[1] = 0;
+                                   // counters[2] = 0;
+                                   // counters[3] = 0;
+        let end = row.getSize();
+        let mut rowOffset = startRange[1];
+
+        let mut x = 0;
+        while x < 4 && rowOffset < end {
+            // for (int x = 0; x < 4 && rowOffset < end; x++) {
+            let bestMatch =
+                Self::decodeDigit(row, &mut counters, rowOffset, &upc_ean_reader::L_PATTERNS)?;
+            resultString.push(char::from_u32('0' as u32 + bestMatch as u32).unwrap());
+            // for (int counter : counters) {
+            //   rowOffset += counter;
+            // }
+
+            rowOffset += counters.iter().sum::<u32>() as usize;
+
+            x += 1;
+        }
+
+        let middleRange =
+            Self::findGuardPattern(row, rowOffset, true, &upc_ean_reader::MIDDLE_PATTERN)?;
+        rowOffset = middleRange[1];
+
+        let mut x = 0;
+        while x < 4 && rowOffset < end {
+            // for (int x = 0; x < 4 && rowOffset < end; x++) {
+            let bestMatch =
+                Self::decodeDigit(row, &mut counters, rowOffset, &upc_ean_reader::L_PATTERNS)?;
+            resultString.push(char::from_u32('0' as u32 + bestMatch as u32).unwrap());
+            // for (int counter : counters) {
+            //   rowOffset += counter;
+            // }
+            rowOffset += counters.iter().sum::<u32>() as usize;
+            x += 1;
+        }
+
+        Ok(rowOffset)
+    }
+}