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Network data conversion

Convert to and from network callbacks

For non-ASCII platforms, CURLOPT_CONV_FROM_NETWORK_FUNCTION is provided. This function should convert to host encoding from the network encoding.
CURLOPT_CONV_TO_NETWORK_FUNCTION should convert from host encoding to the network encoding. It is used when commands or ASCII data are sent over the network.

Convert from UTF-8 callback

CURLOPT_CONV_FROM_UTF8_FUNCTION should convert to host encoding from UTF-8 encoding. It is required only for SSL processing.
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