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I can't find if there is possible to have char / byte type in proto.
I can see various types here:
but I can't find byte type and even int16 types there.
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Protocol Buffer (Protobuf) provides two simpler options for dealing with values that might be of more than one type. The Any type can represent any known Protobuf message type. And you can use the oneof keyword to specify that only one of a range of fields can be set in any message.
A protocol buffer message is a series of key-value pairs. The binary version of a message just uses the field's number as the key – the name and declared type for each field can only be determined on the decoding end by referencing the message type's definition (i.e. the . proto file).
Protobuf is a binary format, so reading and writing should be done as binary, not text. If you don't want binary format, you should consider using something other than protobuf (there are lots of textual data formats, such as XML, JSON, CSV); just using text abstractions is not enough.
Protobuf has a hard limit of 2GB, because many implementations use 32-bit signed arithmetic. For security reasons, many implementations (especially the Google-provided ones) impose a size limit of 64MB by default, although you can increase this limit manually if you need to.
No, there is no fixed 1-byte type. Fixed length has 4 and 8 byte variants only. Most other numeric values are encoded as "varint"s, which is variable length depending on magnitude (and sign, but "zigzag" comes into play there). So you can store bytes with value 0-127 in one byte, and 128-255 in two bytes. 16-bit values will take between 1 and 3 bytes depending on magnitude (and sign /zigzag etc).
For multiples, there is "bytes" for the 8-bit version, and "packed" for the rest; this avoids the cost of a field-header per value.
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