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Utils: Comment and harmonize the various methods for reading ints.

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This commit is contained in:
Andreas Schildbach
2016-03-21 15:01:07 +01:00
parent 01365ca00b
commit d48e810c5d
1 changed files with 24 additions and 19 deletions
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43
core/src/main/java/org/bitcoinj/core/Utils.java
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@@ -184,35 +184,40 @@ public class Utils {
} }
} }
return rev; return rev;
} }
/** Parse 4 bytes from the byte array (starting at the offset) as unsigned 32-bit integer in little endian format. */
public static long readUint32(byte[] bytes, int offset) { public static long readUint32(byte[] bytes, int offset) {
return (bytes[offset++] & 0xFFL) | return (bytes[offset] & 0xffl) |
((bytes[offset++] & 0xFFL) << 8) | ((bytes[offset + 1] & 0xffl) << 8) |
((bytes[offset++] & 0xFFL) << 16) | ((bytes[offset + 2] & 0xffl) << 16) |
((bytes[offset] & 0xFFL) << 24); ((bytes[offset + 3] & 0xffl) << 24);
} }
/** Parse 8 bytes from the byte array (starting at the offset) as signed 64-bit integer in little endian format. */
public static long readInt64(byte[] bytes, int offset) { public static long readInt64(byte[] bytes, int offset) {
return (bytes[offset++] & 0xFFL) | return (bytes[offset] & 0xffl) |
((bytes[offset++] & 0xFFL) << 8) | ((bytes[offset + 1] & 0xffl) << 8) |
((bytes[offset++] & 0xFFL) << 16) | ((bytes[offset + 2] & 0xffl) << 16) |
((bytes[offset++] & 0xFFL) << 24) | ((bytes[offset + 3] & 0xffl) << 24) |
((bytes[offset++] & 0xFFL) << 32) | ((bytes[offset + 4] & 0xffl) << 32) |
((bytes[offset++] & 0xFFL) << 40) | ((bytes[offset + 5] & 0xffl) << 40) |
((bytes[offset++] & 0xFFL) << 48) | ((bytes[offset + 6] & 0xffl) << 48) |
((bytes[offset] & 0xFFL) << 56); ((bytes[offset + 7] & 0xffl) << 56);
} }
/** Parse 4 bytes from the byte array (starting at the offset) as unsigned 32-bit integer in big endian format. */
public static long readUint32BE(byte[] bytes, int offset) { public static long readUint32BE(byte[] bytes, int offset) {
return ((bytes[offset] & 0xFFL) << 24) | return ((bytes[offset] & 0xffl) << 24) |
((bytes[offset + 1] & 0xFFL) << 16) | ((bytes[offset + 1] & 0xffl) << 16) |
((bytes[offset + 2] & 0xFFL) << 8) | ((bytes[offset + 2] & 0xffl) << 8) |
(bytes[offset + 3] & 0xFFL); (bytes[offset + 3] & 0xffl);
} }
/** Parse 2 bytes from the byte array (starting at the offset) as unsigned 16-bit integer in big endian format. */
public static int readUint16BE(byte[] bytes, int offset) { public static int readUint16BE(byte[] bytes, int offset) {
return ((bytes[offset] & 0xff) << 8) | bytes[offset + 1] & 0xff; return ((bytes[offset] & 0xff) << 8) |
(bytes[offset + 1] & 0xff);
} }
/** /**