Hi, 2015-10-04 22:47 GMT+02:00 Javier Domingo Cansino <javier...@gmail.com>:
> Hello, > > I asked Friday on IRC how to write blobs, I was suggested using > blob_raw_put from libubox/blob.h, but as I have to implement a binary > protocol that uses different endianess, non aligned data etc., I think the > best solution is creating a set of helper functions to write/read blobs. > I don't know what you really want to do, but have you looked at protobuf? https://en.wikipedia.org/wiki/Protocol_Buffers > > As this is quite generic library, there might already exist some work done > that I am missing (please link!). I would love to have feedback from this > design before typing code. > > I have started my work on github[1], which is basically a header file with > the following comment and some prototype ideas. The syntax I have thought > is described there, but it basically follows a printf syntax, allowing raw > chars to be written. > > Cheers! > > /* > * Syntax for the function is as follows. > * %[n][a][lb][01r]{i,y,w,d,q,s} > * > * All the characters that don't follow this will be treated as raw chars > * to be written as they are. > * > * Data type > * * i - bit > * * y - byte > * * w - 2 byte word > * * d - 4 byte word > * * q - 8 byte word > * * s - string without termination (use strlen()+1 in quantity to null) > * > * Data value > * * 0 - fill the specified space with zeros > * * 1 - fill the specified space with ones > * * r - fill the specified space with random data > * > * String data type is not valid in this case > * > * Endianess. No conversion by default > * * l - little endian > * * b - big endian > * > * Alignment. No alignment by default > * * a - align this to it's datatype > * bits are aligned to byte > * > * Quantity. One by default > * * n - number of same datatype (placed together) > * this denotes length of string, padded with 0 > * > * Some examples: > * * %4lw - 4 little endian 2 byte word > * * %2i - 2 bits 'ab' from value b'000000ab' > * * %2bi - 2 bits 'ab' from value b'000000ba' > * * %2li - 2 bits 'ab' from value b'ab000000' > * > */ > > > [1] Github branch: https://github.com/txomon/libubox > > _______________________________________________ > openwrt-devel mailing list > openwrt-devel@lists.openwrt.org > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel > >
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