Canonical repo for Dong Web (dong.vielle.dev)
Added Dong specs
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README.md
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README.md
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work-with-dong.md
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work-with-dong.md
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# Dong Files
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Dong files are image files that play audio when opened. The mime type is `application/prs.vielle.dong`
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## Creating a `.dong` file
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A dong file is structured as follows:
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```txt
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d0<version>
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<image-mime><image-data>
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<audio-mime><audio-data>
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<image-data>
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<audio-data>
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```
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### Version
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Version is an 8 bit number that indicates the version of the dong file. This file documents version 2 of the dong file format. This is prefixed with the hex value d0 to indicate that this is a dong file. The first 16 bits of a version 2 `.dong` file should be `11010000 00000010`. If this does not match, it is either a different file format or version.
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### Image Metadata
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Image metadata starts with a mimetype. The mimetype is 255 bytes long, followed by a 00 byte. If the mimetype is shorter than 255 characters, the remaining bytes are filled with 00 bytes.
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The metadata is then followed with an image length, which must be 32 bits long. This represents the number of bytes in the image data.
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### Audio Metadata
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See: Image metadata
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### Image Data
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This is a binary blob taking up the number of bytes allocated in image-length.
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### Audio Data
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This is a binary blob taking up the number of bytes allocated in audio-length.