1 files changed, 97 insertions, 0 deletions
diff --git a/org.fox.ttcomics/src/main/java/org/fox/ttcomics2/junrar/util/VolumeHelper.java b/org.fox.ttcomics/src/main/java/org/fox/ttcomics2/junrar/util/VolumeHelper.java
new file mode 100644
index 0000000..a22ccff
--- /dev/null
+++ b/org.fox.ttcomics/src/main/java/org/fox/ttcomics2/junrar/util/VolumeHelper.java
@@ -0,0 +1,97 @@
+package org.fox.ttcomics2.junrar.util;
+
+public class VolumeHelper {
+    private VolumeHelper() {
+    }
+
+    // public static boolean mergeArchive(Archive archive, ComprDataIO dataIO)
+    // throws IOException {
+    // FileHeader hd = dataIO.getSubHeader();
+    // if (hd.getUnpVersion() >= 20 && hd.getFileCRC() != 0xffffffff
+    // && dataIO.getPackedCRC() != ~hd.getFileCRC()) {
+    // System.err.println("Data Bad CRC");
+    // }
+    //
+    // boolean oldNumbering = !archive.getMainHeader().isNewNumbering()
+    // || archive.isOldFormat();
+    // String nextName = nextVolumeName(archive.getFile().getAbsolutePath(),
+    // oldNumbering);
+    // File nextVolume = new File(nextName);
+    // UnrarCallback callback = archive.getUnrarCallback();
+    // if ((callback != null) && !callback.isNextVolumeReady(nextVolume)) {
+    // return false;
+    // }
+    // if (!nextVolume.exists()) {
+    // return false;
+    // }
+    // archive.setFile(nextVolume);
+    // hd = archive.nextFileHeader();
+    // if (hd == null) {
+    // return false;
+    // }
+    // dataIO.init(hd);
+    // return true;
+    // }
+
+    public static String nextVolumeName(String arcName, boolean oldNumbering) {
+        if (!oldNumbering) {
+            // part1.rar, part2.rar, ...
+            int len = arcName.length();
+            int indexR = len - 1;
+            while ((indexR >= 0) && !isDigit(arcName.charAt(indexR))) {
+                indexR--;
+            }
+            int index = indexR + 1;
+            int indexL = indexR - 1;
+            while ((indexL >= 0) && isDigit(arcName.charAt(indexL))) {
+                indexL--;
+            }
+            if (indexL < 0) {
+                return null;
+            }
+            indexL++;
+            StringBuilder buffer = new StringBuilder(len);
+            buffer.append(arcName, 0, indexL);
+            char[] digits = new char[indexR - indexL + 1];
+            arcName.getChars(indexL, indexR + 1, digits, 0);
+            indexR = digits.length - 1;
+            while ((indexR >= 0) && (++digits[indexR]) == '9' + 1) {
+                digits[indexR] = '0';
+                indexR--;
+            }
+            if (indexR < 0) {
+                buffer.append('1');
+            }
+            buffer.append(digits);
+            buffer.append(arcName, index, len);
+            return buffer.toString();
+        } else {
+            // .rar, .r00, .r01, ...
+            int len = arcName.length();
+            if ((len <= 4) || (arcName.charAt(len - 4) != '.')) {
+                return null;
+            }
+            StringBuilder buffer = new StringBuilder();
+            int off = len - 3;
+            buffer.append(arcName, 0, off);
+            if (!isDigit(arcName.charAt(off + 1))
+                    || !isDigit(arcName.charAt(off + 2))) {
+                buffer.append("r00");
+            } else {
+                char[] ext = new char[3];
+                arcName.getChars(off, len, ext, 0);
+                int i = ext.length - 1;
+                while ((++ext[i]) == '9' + 1) {
+                    ext[i] = '0';
+                    i--;
+                }
+                buffer.append(ext);
+            }
+            return buffer.toString();
+        }
+    }
+
+    private static boolean isDigit(char c) {
+        return (c >= '0') && (c <= '9');
+    }
+}