diff options
| -rw-r--r-- | convert.c | 126 |
1 files changed, 112 insertions, 14 deletions
@@ -915,6 +915,112 @@ static struct stream_filter lf_to_crlf_filter_singleton = { /* + * Cascade filter + */ +#define FILTER_BUFFER 1024 +struct cascade_filter { + struct stream_filter filter; + struct stream_filter *one; + struct stream_filter *two; + char buf[FILTER_BUFFER]; + int end, ptr; +}; + +static int cascade_filter_fn(struct stream_filter *filter, + const char *input, size_t *isize_p, + char *output, size_t *osize_p) +{ + struct cascade_filter *cas = (struct cascade_filter *) filter; + size_t filled = 0; + size_t sz = *osize_p; + size_t to_feed, remaining; + + /* + * input -- (one) --> buf -- (two) --> output + */ + while (filled < sz) { + remaining = sz - filled; + + /* do we already have something to feed two with? */ + if (cas->ptr < cas->end) { + to_feed = cas->end - cas->ptr; + if (stream_filter(cas->two, + cas->buf + cas->ptr, &to_feed, + output + filled, &remaining)) + return -1; + cas->ptr += (cas->end - cas->ptr) - to_feed; + filled = sz - remaining; + continue; + } + + /* feed one from upstream and have it emit into our buffer */ + to_feed = input ? *isize_p : 0; + if (input && !to_feed) + break; + remaining = sizeof(cas->buf); + if (stream_filter(cas->one, + input, &to_feed, + cas->buf, &remaining)) + return -1; + cas->end = sizeof(cas->buf) - remaining; + cas->ptr = 0; + if (input) { + size_t fed = *isize_p - to_feed; + *isize_p -= fed; + input += fed; + } + + /* do we know that we drained one completely? */ + if (input || cas->end) + continue; + + /* tell two to drain; we have nothing more to give it */ + to_feed = 0; + remaining = sz - filled; + if (stream_filter(cas->two, + NULL, &to_feed, + output + filled, &remaining)) + return -1; + if (remaining == (sz - filled)) + break; /* completely drained two */ + filled = sz - remaining; + } + *osize_p -= filled; + return 0; +} + +static void cascade_free_fn(struct stream_filter *filter) +{ + struct cascade_filter *cas = (struct cascade_filter *)filter; + free_stream_filter(cas->one); + free_stream_filter(cas->two); + free(filter); +} + +static struct stream_filter_vtbl cascade_vtbl = { + cascade_filter_fn, + cascade_free_fn, +}; + +static struct stream_filter *cascade_filter(struct stream_filter *one, + struct stream_filter *two) +{ + struct cascade_filter *cascade; + + if (!one || is_null_stream_filter(one)) + return two; + if (!two || is_null_stream_filter(two)) + return one; + + cascade = xmalloc(sizeof(*cascade)); + cascade->one = one; + cascade->two = two; + cascade->end = cascade->ptr = 0; + cascade->filter.vtbl = &cascade_vtbl; + return (struct stream_filter *)cascade; +} + +/* * ident filter */ #define IDENT_DRAINING (-1) @@ -1083,20 +1189,12 @@ struct stream_filter *get_stream_filter(const char *path, const unsigned char *s crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr); if ((crlf_action == CRLF_BINARY) || (crlf_action == CRLF_INPUT) || - (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE)) { - if (filter) { - free_stream_filter(filter); - return NULL; - } - return &null_filter_singleton; - } else if (output_eol(crlf_action) == EOL_CRLF && - !(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS)) { - if (filter) { - free_stream_filter(filter); - return NULL; - } - return &lf_to_crlf_filter_singleton; - } + (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE)) + filter = cascade_filter(filter, &null_filter_singleton); + + else if (output_eol(crlf_action) == EOL_CRLF && + !(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS)) + filter = cascade_filter(filter, &lf_to_crlf_filter_singleton); return filter; } |