Integer

Integers are represented as stop bit encoded entities.
The stop bit decoding process of integer fields is:

1. Determine the length by the stop bit algorithm.
2. Remove stop bit from each byte.
3. Combine 7-bit words (without stop bits) to determine actual integer.

In addition, a nullable field continues with this processing:

• If the value is zero (0), the output value is NULL.
• If the value is positive, subtract 1 from that value to use as the output value.

2.3.6.1.1. Unsigned Integer

Represents unsigned integers using the FAST 7-bit binary encoding.

The example of this decoding process is shown below in Picture 3.18

Picture 3.18 - "Unsigned Integer stop bit decoding"

Decoding code sample of mandatory fields:public int processUInt32Decoding(byte[] buffer, int offset,                                   TemplateFieldValue fieldValue) {     // The primari value is only 0 as this is unsigned     long value = 0l;       while (!PresenceMap.isBitOnPositionSet(buffer[offset], STOP_BIT_POSTION)) {         value = (value << 7) | (buffer[offset++]);     }     value = (value << 7) | (buffer[offset++] & Byte.MAX_VALUE);     fieldValue.setFieldValue(value);     return offset; } Decoding code sample of nullable fields: public int processUInt32Decoding(byte[] buffer, int offset,                                   TemplateFieldValue fieldValue) {     // The primari value is only 0 as this is unsigned     long value = 0l;     while (!PresenceMap.isBitOnPositionSet(buffer[offset], STOP_BIT_POSTION)) {         value = (value << 7) | (buffer[offset++]);     }     value = (value << 7) | (buffer[offset++] & Byte.MAX_VALUE);       if (value == 0) {         fieldValue.setFieldValue(null);     } else {         fieldValue.setFieldValue(value - 1);     }     return offset; }

2.3.6.1.2. Signed Integer

Used to represent a signed (+/-) integer using the FAST 7-bit binary encoding.
The following diagram illustrates signed integer decoding of a negative number.

Picture 3.19 - "Signed integer stop bit decoding"

Decoding code sample of non-nullable fields: public int processInt32Decoding(byte[] buffer, int offset,                                  TemplateFieldValue fieldValue) {     int value = 0;     if (PresenceMap.isBitOnPositionSet(buffer[offset], 1)) {         value = 0xFFFFFFFF;     }     while (!PresenceMap.isBitOnPositionSet(buffer[offset], STOP_BIT_POSTION)) {         value = (value << 7) | (buffer[offset++]);     }     value = (value << 7) | (buffer[offset++] & Byte.MAX_VALUE);       fieldValue.setFieldValue(value);       return offset; } Decoding code sample of nullable fields:public int processInt32Decoding(byte[] buffer, int offset,                                  TemplateFieldValue fieldValue) {     int value = 0;       if (PresenceMap.isBitOnPositionSet(buffer[offset], 1)) {         value = 0xFFFFFFFF;     }     while (!PresenceMap.isBitOnPositionSet(buffer[offset], STOP_BIT_POSTION)) {         value = (value << 7) | (buffer[offset++]);     }     value = (value << 7) | (buffer[offset++] & Byte.MAX_VALUE);       if (value == 0) {         fieldValue.setFieldValue(null);     } else {         if (value > 0) {             value -= 1;         }         fieldValue.setFieldValue(value);     }     return offset; }