Updated on 2026-08-14

app/src/main/java/com/tangem/wallet/btc/BitcoinInputStream.java

@@ -0,0 +1,69 @@
+package com.tangem.wallet.btc;
+
+/**
+ * Created by Ilia on 29.09.2017.
+ */
+
+import java.io.ByteArrayInputStream;
+import java.io.EOFException;
+import java.io.IOException;
+
+@SuppressWarnings("WeakerAccess")
+public class BitcoinInputStream extends ByteArrayInputStream {
+    public BitcoinInputStream(byte[] buf) {
+        super(buf);
+    }
+
+    @SuppressWarnings("unused")
+    public BitcoinInputStream(byte[] buf, int offset, int length) {
+        super(buf, offset, length);
+    }
+
+    public int readInt16() throws EOFException {
+        return (readByte() & 0xff) | ((readByte() & 0xff) << 8);
+    }
+
+    public int readInt32() throws EOFException {
+        return (readByte() & 0xff) | ((readByte() & 0xff) << 8) | ((readByte() & 0xff) << 16) | ((readByte() & 0xff) << 24);
+    }
+
+    public long readInt64() throws EOFException {
+        return (readInt32() & 0xFFFFFFFFL) | ((readInt32() & 0xFFFFFFFFL) << 32);
+    }
+
+    public int readByte() throws EOFException {
+        int readedByte = super.read();
+        if (readedByte == -1) {
+            throw new EOFException();
+        }
+        return readedByte;
+    }
+
+    public long readVarInt() throws EOFException {
+        int readedByte = readByte();
+        if (readedByte < 0xfd) {
+            return readedByte;
+        } else if (readedByte == 0xfd) {
+            return readInt16();
+        } else if (readedByte == 0xfe) {
+            return readInt32();
+        } else {
+            return readInt64();
+        }
+    }
+
+    public byte[] readChars(final int count) throws IOException {
+        byte[] buf = new byte[count];
+        int off = 0;
+        while (off != count) {
+            int bytesReadCurr = read(buf, off, count - off);
+            if (bytesReadCurr == -1) {
+                throw new EOFException();
+            } else {
+                off += bytesReadCurr;
+            }
+        }
+        return buf;
+    }
+
+}