Remove some unused internal code (#164)

Author: nhz2

src/buffer.jl

@@ -183,15 +183,6 @@ function skipbuffer!(buf::Buffer, n::Integer)
     return buf
 end
 
-# Take the ownership of the marked data.
-function takemarked!(buf::Buffer)
-    @assert buf.markpos > 0
-    sz = buf.marginpos - buf.markpos
-    copyto!(buf.data, 1, buf.data, buf.markpos, sz)
-    initbuffer!(buf)
-    return resize!(buf.data, sz)
-end
-
 # Copy data from `data` to `buf`.
 function copydata!(buf::Buffer, data::Ptr{UInt8}, nbytes::Integer)
     makemargin!(buf, nbytes)
@@ -200,11 +191,6 @@ function copydata!(buf::Buffer, data::Ptr{UInt8}, nbytes::Integer)
     return buf
 end
 
-# Copy data from `data` to `buf`.
-function copydata!(buf::Buffer, data::Buffer, nbytes::Integer = length(data))
-    return copydata!(buf, bufferptr(data), nbytes)
-end
-
 # Copy data from `buf` to `data`.
 function copydata!(data::Ptr{UInt8}, buf::Buffer, nbytes::Integer)
     # NOTE: It's caller's responsibility to ensure that the buffer has at least