83 lines
1.9 KiB
Markdown
83 lines
1.9 KiB
Markdown
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# encoder Module
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| Since | Origin / Contributor | Maintainer | Source |
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| :----- | :-------------------- | :---------- | :------ |
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| 2016-02-26 | [Terry Ellison](https://github.com/TerryE) | [Terry Ellison](https://github.com/TerryE) | [encoder.c](../../app/modules/encoder.c)|
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The encoder modules provides various functions for encoding and decoding byte data.
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## encoder.toBase64()
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Provides a Base64 representation of a (binary) Lua string.
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#### Syntax
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`b64 = encoder.toBase64(binary)`
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#### Parameters
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`binary` input string to Base64 encode
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#### Return
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A Base64 encoded string.
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#### Example
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```lua
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print(encoder.toBase64(crypto.hash("sha1","abc")))
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```
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## encoder.fromBase64()
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Decodes a Base64 representation of a (binary) Lua string back into the original string. An error is
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thrown if the string is not a valid base64 encoding.
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#### Syntax
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`binary_string = encoder.fromBase64(b64)`
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#### Parameters
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`b64` Base64 encoded input string
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#### Return
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The decoded Lua (binary) string.
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#### Example
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```lua
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print(encoder.fromBase64(encoder.toBase64("hello world")))
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```
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## encoder.toHex()
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Provides an ASCII hex representation of a (binary) Lua string. Each byte in the input string is
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represented as two hex characters in the output.
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#### Syntax
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`hexstr = encoder.toHex(binary)`
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#### Parameters
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`binary` input string to get hex representation for
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#### Returns
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An ASCII hex string.
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#### Example
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```lua
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print(encoder.toHex(crypto.hash("sha1","abc")))
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```
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## encoder.fromHex()
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Returns the Lua binary string decode of a ASCII hex string. Each byte in the output string is
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represented as two hex characters in the input. An error is thrown if the string is not a
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valid base64 encoding.
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#### Syntax
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`binary = encoder.fromHex(hexstr)`
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#### Parameters
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`hexstr` An ASCII hex string.
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#### Returns
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Decoded string of hex representation.
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#### Example
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```lua
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print(encoder.fromHex("6a6a6a"))
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```
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