Package org.datavec.api.records
Class IOUtils
- java.lang.Object
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- org.datavec.api.records.IOUtils
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public class IOUtils extends Object
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Field Summary
Fields Modifier and Type Field Description static char[]
hexchars
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static int
compareBytes(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2)
Lexicographic order of binary data.static int
getVIntSize(long i)
Get the encoded length if an integer is stored in a variable-length formatstatic double
readDouble(byte[] bytes, int start)
Parse a double from a byte array.static float
readFloat(byte[] bytes, int start)
Parse a float from a byte array.static int
readVInt(byte[] bytes, int start)
Reads a zero-compressed encoded integer from a byte array and returns it.static int
readVInt(DataInput in)
Reads a zero-compressed encoded integer from a stream and returns it.static long
readVLong(byte[] bytes, int start)
Reads a zero-compressed encoded long from a byte array and returns it.static long
readVLong(DataInput in)
Reads a zero-compressed encoded long from a stream and return it.static void
writeVInt(DataOutput stream, int i)
Serializes an int to a binary stream with zero-compressed encoding.static void
writeVLong(DataOutput stream, long i)
Serializes a long to a binary stream with zero-compressed encoding.
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Method Detail
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readFloat
public static float readFloat(byte[] bytes, int start)
Parse a float from a byte array.
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readDouble
public static double readDouble(byte[] bytes, int start)
Parse a double from a byte array.
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readVLong
public static long readVLong(byte[] bytes, int start) throws IOException
Reads a zero-compressed encoded long from a byte array and returns it.- Parameters:
bytes
- byte array with decode longstart
- starting index- Returns:
- deserialized long
- Throws:
IOException
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readVInt
public static int readVInt(byte[] bytes, int start) throws IOException
Reads a zero-compressed encoded integer from a byte array and returns it.- Parameters:
bytes
- byte array with the encoded integerstart
- start index- Returns:
- deserialized integer
- Throws:
IOException
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readVLong
public static long readVLong(DataInput in) throws IOException
Reads a zero-compressed encoded long from a stream and return it.- Parameters:
in
- input stream- Returns:
- deserialized long
- Throws:
IOException
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readVInt
public static int readVInt(DataInput in) throws IOException
Reads a zero-compressed encoded integer from a stream and returns it.- Parameters:
in
- input stream- Returns:
- deserialized integer
- Throws:
IOException
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getVIntSize
public static int getVIntSize(long i)
Get the encoded length if an integer is stored in a variable-length format- Returns:
- the encoded length
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writeVLong
public static void writeVLong(DataOutput stream, long i) throws IOException
Serializes a long to a binary stream with zero-compressed encoding. For -112 <= i <= 127, only one byte is used with the actual value. For other values of i, the first byte value indicates whether the long is positive or negative, and the number of bytes that follow. If the first byte value v is between -113 and -120, the following long is positive, with number of bytes that follow are -(v+112). If the first byte value v is between -121 and -128, the following long is negative, with number of bytes that follow are -(v+120). Bytes are stored in the high-non-zero-byte-first order.- Parameters:
stream
- Binary output streami
- Long to be serialized- Throws:
IOException
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writeVInt
public static void writeVInt(DataOutput stream, int i) throws IOException
Serializes an int to a binary stream with zero-compressed encoding.- Parameters:
stream
- Binary output streami
- int to be serialized- Throws:
IOException
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compareBytes
public static int compareBytes(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2)
Lexicographic order of binary data.
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