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===== Compression =====

The following compression algorithms are available:

- First was is the [[http://en.wikipedia.org/wiki/DEFLATE|Deflate algorithm]] that gives good results for short diagrams.
===== Compression =====

The following compression algorithms are available:

- First was is the [[http://en.wikipedia.org/wiki/DEFLATE|Deflate algorithm]] that gives good results for short diagrams.
··- Starting in version 1.2017.20, PlantUML also supports the [[https://en.wikipedia.org/wiki/Brotli|Brotli algorithm]] (issue [[https://github.com/plantuml/plantuml/issues/117|#117]]) that gives better results for larger diagrams. An initial ''0'' character is added to the encoded string to indicate Brotli (Deflated data never starts with ''0'').
··-·You·can·also·use·simple·HEX·encoding,·see·below.·An·initial·''~h'' is added to indicate this encoding.
2. Starting in version 1.2017.20, PlantUML also supports the [[https://en.wikipedia.org/wiki/Brotli|Brotli algorithm]] (issue [[https://github.com/plantuml/plantuml/issues/117|#117]]) that gives better results for larger diagrams. An initial ''0'' character is added to the encoded string to indicate Brotli (Deflated data never starts with ''0'').
3.·You·can·also·use·simple·HEX·encoding,·see·below.·An·initial·''~''·character is added to indicate this encoding.
**Principle**

For example, the following uml text description:

<code>
@startuml
Alice -> Bob: Authentication Request
Bob --> Alice: Authentication Response
@enduml
</code>

is [[http://www.plantuml.com/plantuml/uml/Syp9J4vLqBLJSCfFib9mB2t9ICqhoKnEBCdCprC8IYqiJIqkuGBAAUW2rO0LOr5LN92VLvpA1G00|encoded as]]:

<code>
Syp9J4vLqBLJSCfFib9mB2t9ICqhoKnEBCdCprC8IYqiJIqkuGBAAUW2rO0LOr5LN92VLvpA1G00
</code>


To achieve such encoding, the text diagram is:

- Encoded in UTF-8
- Compressed using [[http://en.wikipedia.org/wiki/DEFLATE|Deflate]] or [[https://en.wikipedia.org/wiki/Brotli|Brotli]] algorithm
- Reencoded in ASCII using a transformation //close// to [[http://en.wikipedia.org/wiki/Base64|base64]]


**Why not use Base64?**

The main reason is historic: this format was not created to be public at first. Now, it's too late to change it. However, the only difference is in character order.

Where in base64 the mapping array for values 0-63 is:
<code>
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
</code>

For PlantUML, the mapping array for values 0-63 is:
<code>
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_
</code>


===== Compression comparison =====

The following diagram:

<plantuml>
@startuml
skinparam backgroundColor #EEEBDC
skinparam handwritten true

skinparam sequenceArrowColor DeepSkyBlue
skinparam sequenceActorBorderColor DeepSkyBlue
skinparam sequenceLifeLineBorderColor blue
skinparam sequenceLifeLineBackgroundColor #A9DCDF
skinparam sequenceParticipantBorderColor DeepSkyBlue
skinparam sequenceParticipantBackgroundColor DodgerBlue
skinparam sequenceParticipantFontName Impact
skinparam sequenceParticipantFontSize 17
skinparam sequenceParticipantFontColor #A9DCDF
skinparam sequenceActorBackgroundColor aqua
skinparam sequenceActorFontColor DeepSkyBlue
skinparam sequenceActorFontSize 17
skinparam sequenceActorFontName Aapex

actor User
participant "First Class" as ParticipantA
participant "Second Class" as ParticipantB
participant "Last Class" as ParticipantC

User -> ParticipantA: DoWork
activate ParticipantA

ParticipantA -> ParticipantB: Create Request
activate ParticipantB

ParticipantB -> ParticipantC: DoWork
activate ParticipantC
ParticipantC --> ParticipantB: WorkDone
destroy ParticipantC

ParticipantB --> ParticipantA: Request Created
deactivate ParticipantB

ParticipantA --> User: Done
deactivate ParticipantA
@enduml
</plantuml>

is compressed to a

* [[http://www.plantuml.com/plantuml/uml/ZP4zRy8m48Pt_ueJdHawLMMe53iWLK9LLLHrFk8hM04xd9rI-kiR0u8a1CAG8SdpVja-DxP0nZNCCSiNx4ghbLivXeVnU2nJ9Vo9MABLMpOXa8N09OdQFq-Racn62RFR7WnIecAMx-Ig8Zl0B3YMZZNnFVZKV5UFfRfYteEs1oNFgKed7Oftv60oKw0DzpUgYrf9gTCBudxTnDdmXck2rtM1MUY7P-QFuF6f7-nRV3ZzLctSb7YDFPlUSQstgvwG_VG42_eL0kD7-FJ4eZXFWS74i0-WLkZz0D13RMVI96UKEQkxKTb4ftZDKmaHEy3mfP4qggxqot4UQveV3DJi8UflBQqSWMAAae-utuTE3zdma2qFTJDVrQKAXXVvKPawIq9NyUnshS7Du8lbnzh75ReowH-Gx7tYISRc--JEa_i7|428-char string length using Deflate]]
* [[http://www.plantuml.com/plantuml/uml/06tq404I5ENsC6cXKT6xxgxaBDG3o_tzkTRbkDJuRa4mYLIoIEFVZsapwhAr5NDHB0jrZfWK5MOp8y53KKy_J2adzUr-HCAJ8bVfEA7x6qMwXhNtcUJYCT4gMZV_c2gzJk9gimqo81bOfXLN-tkYpiaWi3aabF_wrItuxPLX5NINL6FKhAboWjmXbI8jiBfIRnXs0h40re09D-HpekC83iDO8GEXFHTCMoPlXmKCx05mLK_fTdsZCJY1geDzQhs6aar6qIIfU1V5QYHQ5wvIFj8v6xZE0zWeZksK6S5mgnjDR9L1ao9uZg7-gFLepB1EeGVeUILgETgbkEtuAelaPmmGV7kEDjEioz1d6D_0WvvYzGbScBwP8CnA9ZosEQ2vGlBk_7W00|393-char string length using Brotli]]
**Principle**

For example, the following uml text description:

<code>
@startuml
Alice -> Bob: Authentication Request
Bob --> Alice: Authentication Response
@enduml
</code>

is [[http://www.plantuml.com/plantuml/uml/Syp9J4vLqBLJSCfFib9mB2t9ICqhoKnEBCdCprC8IYqiJIqkuGBAAUW2rO0LOr5LN92VLvpA1G00|encoded as]]:

<code>
Syp9J4vLqBLJSCfFib9mB2t9ICqhoKnEBCdCprC8IYqiJIqkuGBAAUW2rO0LOr5LN92VLvpA1G00
</code>


To achieve such encoding, the text diagram is:

- Encoded in UTF-8
- Compressed using [[http://en.wikipedia.org/wiki/DEFLATE|Deflate]] or [[https://en.wikipedia.org/wiki/Brotli|Brotli]] algorithm
- Reencoded in ASCII using a transformation //close// to [[http://en.wikipedia.org/wiki/Base64|base64]]


**Why not use Base64?**

The main reason is historic: this format was not created to be public at first. Now, it's too late to change it. However, the only difference is in character order.

Where in base64 the mapping array for values 0-63 is:
<code>
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
</code>

For PlantUML, the mapping array for values 0-63 is:
<code>
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_
</code>


===== Compression comparison =====

The following diagram:

<plantuml>
@startuml
skinparam backgroundColor #EEEBDC
skinparam handwritten true

skinparam sequenceArrowColor DeepSkyBlue
skinparam sequenceActorBorderColor DeepSkyBlue
skinparam sequenceLifeLineBorderColor blue
skinparam sequenceLifeLineBackgroundColor #A9DCDF
skinparam sequenceParticipantBorderColor DeepSkyBlue
skinparam sequenceParticipantBackgroundColor DodgerBlue
skinparam sequenceParticipantFontName Impact
skinparam sequenceParticipantFontSize 17
skinparam sequenceParticipantFontColor #A9DCDF
skinparam sequenceActorBackgroundColor aqua
skinparam sequenceActorFontColor DeepSkyBlue
skinparam sequenceActorFontSize 17
skinparam sequenceActorFontName Aapex

actor User
participant "First Class" as ParticipantA
participant "Second Class" as ParticipantB
participant "Last Class" as ParticipantC

User -> ParticipantA: DoWork
activate ParticipantA

ParticipantA -> ParticipantB: Create Request
activate ParticipantB

ParticipantB -> ParticipantC: DoWork
activate ParticipantC
ParticipantC --> ParticipantB: WorkDone
destroy ParticipantC

ParticipantB --> ParticipantA: Request Created
deactivate ParticipantB

ParticipantA --> User: Done
deactivate ParticipantA
@enduml
</plantuml>

is compressed to a

* [[http://www.plantuml.com/plantuml/uml/ZP4zRy8m48Pt_ueJdHawLMMe53iWLK9LLLHrFk8hM04xd9rI-kiR0u8a1CAG8SdpVja-DxP0nZNCCSiNx4ghbLivXeVnU2nJ9Vo9MABLMpOXa8N09OdQFq-Racn62RFR7WnIecAMx-Ig8Zl0B3YMZZNnFVZKV5UFfRfYteEs1oNFgKed7Oftv60oKw0DzpUgYrf9gTCBudxTnDdmXck2rtM1MUY7P-QFuF6f7-nRV3ZzLctSb7YDFPlUSQstgvwG_VG42_eL0kD7-FJ4eZXFWS74i0-WLkZz0D13RMVI96UKEQkxKTb4ftZDKmaHEy3mfP4qggxqot4UQveV3DJi8UflBQqSWMAAae-utuTE3zdma2qFTJDVrQKAXXVvKPawIq9NyUnshS7Du8lbnzh75ReowH-Gx7tYISRc--JEa_i7|428-char string length using Deflate]]
* [[http://www.plantuml.com/plantuml/uml/06tq404I5ENsC6cXKT6xxgxaBDG3o_tzkTRbkDJuRa4mYLIoIEFVZsapwhAr5NDHB0jrZfWK5MOp8y53KKy_J2adzUr-HCAJ8bVfEA7x6qMwXhNtcUJYCT4gMZV_c2gzJk9gimqo81bOfXLN-tkYpiaWi3aabF_wrItuxPLX5NINL6FKhAboWjmXbI8jiBfIRnXs0h40re09D-HpekC83iDO8GEXFHTCMoPlXmKCx05mLK_fTdsZCJY1geDzQhs6aar6qIIfU1V5QYHQ5wvIFj8v6xZE0zWeZksK6S5mgnjDR9L1ao9uZg7-gFLepB1EeGVeUILgETgbkEtuAelaPmmGV7kEDjEioz1d6D_0WvvYzGbScBwP8CnA9ZosEQ2vGlBk_7W00|393-char string length using Brotli]]


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