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@ -189,22 +189,23 @@ bit, but don't merge them: `0101_0101` (85), `0111_0011` (115), `0110_0101`
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(101), `0111_0010` (114) and `1011_0001` (49, if we remove the stop bit, that |
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is), which converted by the ASCII table gives us "User1". |
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Remember that we jumped the Presence Map? Now it is the time to use it, since |
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we are reading "ID" and it has an operator that requires the Presence Map. The |
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Presence Map we read before was `100_0000` (with the stop bit removed), so |
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yeah, the "ID" is present. We read the next byte, `1000_0100`, which is "4". |
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But there is a gotcha here: The field is optional. So although we read "4", the |
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Now it is the time to use the Presence Map, since we are reading the "ID" field |
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and it has an operator that requires the Presence Map. The Presence Map we read |
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before was `100_0000` (with the stop bit removed), so yeah, the "ID" is present |
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in the incoming data. We read the next byte, `1000_0100`, which is "4". But |
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there is a gotcha here: The field is optional. So although we read "4", the |
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actual value is "3" -- if the value read was "0" it meant that the ID is Null. |
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Good. We just finished reading the first record of "InnerSequence". Now we read |
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the second record. |
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Good. We just finished reading the first record of "InnerSequence": The user |
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"User1" has ID "3" and belongs to group "6868070". Now we read the second |
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record. |
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We don't need to read the length again, but we need to read the Presence Map |
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for this record. It is the byte `1000_0000`, a Presence Map indicating that |
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none of the fields with operators are present. But, again, it is not the time |
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for the Presence Map, but for the "Username". The bytes for the field are |
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`0101_0101` (85), `0111_0011` (115), `0110_0101` (101), `0111_0010` (114) and |
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`1011_0001` (50), which is "User2". |
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for the Presence Map, 'cause we have to read "Username". The bytes for the |
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field are `0101_0101` (85), `0111_0011` (115), `0110_0101` (101), `0111_0010` |
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(114) and `1011_0001` (50), which is "User2". |
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This second record have an empty presence map (`1000_0000`) meaning that the ID |
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is not present in the incoming data. Because the field has the Increment |
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@ -215,15 +216,15 @@ That ends the "InnerSequence" for the first record of "OuterSequence". Going
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faster now: |
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- `1111_1111`: The second "GroupID" (only one byte due the stop bit), which is |
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127. |
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"127". |
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- `1000_0001`: The length of "InnerSequence"; it is just 1 element. |
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- `1100_0000`: The presence map for the first record of "InnerSequence"; it |
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means the "ID" is present. |
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- `0101_0101`, `1011_0001`: The username. "U1". |
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- `1111_1111`: The "ID" for user "U1" is 126 (it reads as 127, but because the |
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field is optional, we decrement the value by 1). |
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- `0000_1000`, `1000_0000`: The third "GroupID". Removing the stop bit and |
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joining the bits we have `1000_0000_0000` which is 2048. |
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- `0000_1000`, `1000_0000`: The third "GroupID". Removing the stop bits and |
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joining the bits we have `0000_1000 0000_0000` which is 2048. |
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- `1000_0010`: Length of the "InnerSequence" in the 3rd group; 2 elements. |
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- `1100_0000`: Presence Map of the first record of "InnerSequence"; ID is |
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present. |
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@ -233,8 +234,10 @@ faster now:
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present. |
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- `0100_1101`, `1110_0101`: Username. "Me". |
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- Not reading any bytes now 'cause the Presence Map pointed that the "ID" is |
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not present, but because the previous value was 53, the ID for username "Me" |
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is 54. |
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not present, but because the previous value for this field was 53, the ID for |
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username "Me" is 54. Since this is the last element of "InnerSequence", that |
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sequence is complete; also, this is the last element of "OuterSequence", so |
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everything is done. |
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# Decimals |
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