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Showing content from https://github.com/awslabs/aws-c-event-stream below:

awslabs/aws-c-event-stream: C99 implementation of the vnd.amazon.eventstream content-type.

C99 implementation of the vnd.amazon.event-stream content-type.

This library is licensed under the Apache 2.0 License.

CMake 3.9+ is required to build.

<install-path> must be an absolute path in the following instructions.

If you are building on Linux, you will need to build aws-lc and s2n-tls first.

git clone git@github.com:awslabs/aws-lc.git
cmake -S aws-lc -B aws-lc/build -DCMAKE_INSTALL_PREFIX=<install-path>
cmake --build aws-lc/build --target install

git clone git@github.com:aws/s2n-tls.git
cmake -S s2n-tls -B s2n-tls/build -DCMAKE_INSTALL_PREFIX=<install-path> -DCMAKE_PREFIX_PATH=<install-path>
cmake --build s2n-tls/build --target install
Building aws-c-event-stream and Remaining Dependencies
git clone git@github.com:awslabs/aws-c-common.git
cmake -S aws-c-common -B aws-c-common/build -DCMAKE_INSTALL_PREFIX=<install-path>
cmake --build aws-c-common/build --target install

git clone git@github.com:awslabs/aws-checksums.git
cmake -S aws-checksums -B aws-checksums/build -DCMAKE_INSTALL_PREFIX=<install-path> -DCMAKE_PREFIX_PATH=<install-path>
cmake --build aws-checksums/build --target install

git clone git@github.com:awslabs/aws-c-cal.git
cmake -S aws-c-cal -B aws-c-cal/build -DCMAKE_INSTALL_PREFIX=<install-path> -DCMAKE_PREFIX_PATH=<install-path>
cmake --build aws-c-cal/build --target install

git clone git@github.com:awslabs/aws-c-io.git
cmake -S aws-c-io -B aws-c-io/build -DCMAKE_INSTALL_PREFIX=<install-path> -DCMAKE_PREFIX_PATH=<install-path>
cmake --build aws-c-io/build --target install

git clone git@github.com:awslabs/aws-c-event-stream.git
cmake -S aws-c-event-stream -B aws-c-event-stream/build -DCMAKE_INSTALL_PREFIX=<install-path> -DCMAKE_PREFIX_PATH=<install-path>
cmake --build aws-c-event-stream/build --target install

Event stream encoding provides bidirectional communication between a client and a server.

Each message consists of two sections: the prelude and the data. The prelude consists of:

  1. The total byte length of the message
  2. The combined byte length of all headers

The data section consists of:

  1. Headers
  2. Payload

Each section ends with a 4-byte big-endian CRC32 checksum. The message checksum is for both the prelude section and the data section.

Total message overhead, including the prelude and both checksums, is 16 bytes.

The following diagram shows the components that make up a message and a header. There are multiple headers per message.


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