phr_decode_chunked
- a function for decoding chunked-encoded input - to picohttpparser.As suggested in the doc-comment of the function (shown below), the function is designed to decode the data in-place. In other words, it is not copy-less.
/* the function rewrites the buffer given as (buf, bufsz) removing the chunked- * encoding headers. When the function returns without an error, bufsz is * updated to the length of the decoded data available. Applications should * repeatedly call the function while it returns -2 (incomplete) every time * supplying newly arrived data. If the end of the chunked-encoded data is * found, the function returns a non-negative number indicating the number of * octets left undecoded at the tail of the supplied buffer. Returns -1 on * error. */ ssize_t phr_decode_chunked(struct phr_chunked_decoder *decoder, char *buf, size_t *bufsz);It is intentionally designed as such.
Consider a input like the following. The example is more than 2MB long even though it contains only 2 bytes of data. The input is conformant to the HTTP/1.1 specification since it does not define the maximum length of the chunked extensions, requires every conforming implementation to ignore unknown extensions.
1 very-very-veery long extension that lasts ...(snip) 1MB a 1 very-very-veery long extension that lasts ...(snip) 1MB aTo handle such input without getting the memory exhausted, a decoder should either a) only preserve the decoded data (requires a copy), or b) limit the size of the chunked-encoded data.
B might have been easier to implement, but such a feature might be difficult to administer. So I decided to take the route a, and for simplicity implemented the decoder to always adjust the position of the data in-place.
Always calling
memmove
for adjusting the position might induce some overhead, but I assume it to be negligible for two reasons: both the source and destination would exist in the CPU cache / the overhead of unaligned memory access is small on recent Intel CPU.For ease-of-use, I have added examples to the README.
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