com.opencloud.slee.resources.in.datatypes.sms

Class GSM7BitPacking

java.lang.Object

com.opencloud.slee.resources.in.datatypes.sms.GSM7BitPacking

public class GSM7BitPacking
extends Object

Utilities for packing and unpacking 7-bit values according to the rules for SMS/CBS and USSD.

The common "unpacked" format stores one 7-bit value per byte. This is the format expected by the GSM7BitAlphabet class.

See 3GPP TS 23.038 section 6.1.2 for further details on the packing rules used.

Method Summary

Methods

Modifier and Type	Method and Description
static int	getPackedSMSSize(int count) Compute the number of bytes needed for SMS/CBS packing.
static int	getPackedUSSDSize(byte[] src, int srcpos, int count) Compute the number of bytes needed for USSD packing.
static int	getUnpackedSMSSize(int count) Compute the number of bytes needed for SMS/CBS unpacking.
static int	getUnpackedUSSDSize(byte[] src, int srcpos, int bytecount) Compute the number of bytes needed for USSD unpacking.
static void	packSMS(byte[] src, int srcpos, byte[] dst, int dstpos, int count) Pack from bytes to 7-bit fields, using the SMS/CBS packing rules.
static int	packUSSD(byte[] src, int srcpos, byte[] dst, int dstpos, int count) Pack from bytes to 7-bit fields, using the USSD packing rules.
static void	unpackSMS(byte[] src, int srcpos, byte[] dst, int dstpos, int count) Unpack a 7-bit packed value to a series of 8-bit aligned values, using the SMS/CBS packing rules.
static int	unpackUSSD(byte[] src, int srcpos, byte[] dst, int dstpos, int bytecount) Unpack a 7-bit packed value to a series of 8-bit aligned values, using the USSD packing rules.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

unpackSMS

public static void unpackSMS(byte[] src,
             int srcpos,
             byte[] dst,
             int dstpos,
             int count)

Unpack a 7-bit packed value to a series of 8-bit aligned values, using the SMS/CBS packing rules.

Parameters:

src - the array to unpack from

srcpos - the offset within src (in bytes) to start at

dst - the array to unpack to

dstpos - the offset within dst (in bytes) to start at

count - the number of values to unpack

unpackUSSD

public static int unpackUSSD(byte[] src,
             int srcpos,
             byte[] dst,
             int dstpos,
             int bytecount)

Unpack a 7-bit packed value to a series of 8-bit aligned values, using the USSD packing rules.

Parameters:

src - the array to unpack from

srcpos - the offset within src (in bytes) to start at

dst - the array to unpack to

dstpos - the offset within dst (in bytes) to start at

bytecount - the number of *bytes* to unpack

Returns:

the number of values actually unpacked

packSMS

public static void packSMS(byte[] src,
           int srcpos,
           byte[] dst,
           int dstpos,
           int count)

Pack from bytes to 7-bit fields, using the SMS/CBS packing rules.

Parameters:

src - the array to pack from

srcpos - the offset within src (in bytes) to start at

dst - the array to pack to

dstpos - the offset within dst (in bytes) to start at

count - the number of values to pack

packUSSD

public static int packUSSD(byte[] src,
           int srcpos,
           byte[] dst,
           int dstpos,
           int count)

Pack from bytes to 7-bit fields, using the USSD packing rules.

Parameters:

src - the array to pack from

srcpos - the offset within src (in bytes) to start at

dst - the array to pack to

dstpos - the offset within dst (in bytes) to start at

count - the number of values to pack

Returns:

the number of bytes actually written

getUnpackedSMSSize

public static int getUnpackedSMSSize(int count)

Compute the number of bytes needed for SMS/CBS unpacking. Unlike USSD, this is independent of the actual data contents.

Parameters:

count - the number of values to unpack

Returns:

the actual number of bytes that unpackSMS(byte[], int, byte[], int, int) will use given the same parameters

getPackedSMSSize

public static int getPackedSMSSize(int count)

Compute the number of bytes needed for SMS/CBS packing. Unlike USSD, this is independent of the actual data contents.

Parameters:

count - the number of values to pack

Returns:

the actual number of bytes that packSMS(byte[], int, byte[], int, int) will use given the same parameters

getUnpackedUSSDSize

public static int getUnpackedUSSDSize(byte[] src,
                      int srcpos,
                      int bytecount)

Compute the number of bytes needed for USSD unpacking.

Parameters:

src - the array to unpack from

srcpos - the offset within src (in bytes) to start at

bytecount - the number of *bytes* to unpack

Returns:

the actual number of bytes that unpackUSSD(byte[], int, byte[], int, int) will use given the same parameters

getPackedUSSDSize

public static int getPackedUSSDSize(byte[] src,
                    int srcpos,
                    int count)

Compute the number of bytes needed for USSD packing.

Parameters:

src - the array to pack from

srcpos - the offset within src (in bytes) to start at

count - the number of values to pack

Returns:

the actual number of bytes that packUSSD(byte[], int, byte[], int, int) will use given the same parameters