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I'm not completly satisfied of bytes_writer-2.patch. Most encoders work directly on a pointer (char*). If I want to keep the code using pointers (because it is efficient), I have to resynchronize the writer and the pointer before and after calling writer methods.
Here is a new patch implementing a different approach, closer to the current code. The patch version 3 has no "pos" attribute: the "position" is now a pointer (str). So encoders can just use this pointer instead of their own pointer.
I expect that replacing "*p++ = c;" with "*writer.str++ = c;" would not add an important overhead, especially because writer is a local variable, and str is the first attribute of the structure. I hope that the machine code will be exactly the same.