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370 lines
7.2 KiB
370 lines
7.2 KiB
2 months ago
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/*
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* UCW Library -- Fast Buffered I/O on itself
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*
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* (c) 2012 Maria Matejka <mq@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/clists.h>
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#include <ucw/fastbuf.h>
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#include <ucw/mempool.h>
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#include <stdio.h>
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#define FB_MULTI_NAME "<multi>"
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struct fb_multi {
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struct fastbuf fb;
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struct mempool *mp;
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struct subbuf *cur;
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ucw_off_t len;
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clist subbufs;
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};
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#define FB_MULTI(f) ((struct fb_multi *)(f))
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struct subbuf {
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cnode n;
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ucw_off_t begin, end, offset;
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struct fastbuf *fb;
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};
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static void
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fbmulti_get_ptrs(struct fastbuf *f)
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{
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struct subbuf *sb = FB_MULTI(f)->cur;
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struct fastbuf *ff = sb->fb;
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f->buffer = ff->buffer;
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f->bptr = ff->bptr;
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f->bstop = ff->bstop;
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f->bufend = ff->bufend;
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f->pos = sb->begin + (ff->pos - sb->offset);
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}
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static void
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fbmulti_set_ptrs(struct fastbuf *f)
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{
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FB_MULTI(f)->cur->fb->bptr = f->bptr;
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}
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static int
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fbmulti_subbuf_next(struct fastbuf *f)
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{
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struct subbuf *cur = FB_MULTI(f)->cur;
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struct subbuf *next = clist_next(&FB_MULTI(f)->subbufs, &cur->n);
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if (!next)
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return 0;
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// Get the end of current buf if not known yet
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if (!f->seek && !next->begin)
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next->begin = cur->end = f->pos;
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// Set the beginning of the next buf
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if (next->fb->seek)
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{
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bsetpos(next->fb, 0);
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next->offset = 0;
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}
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else
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{
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ASSERT(!f->seek);
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next->offset = btell(next->fb);
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}
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// Set the pointers
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FB_MULTI(f)->cur = next;
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fbmulti_get_ptrs(f);
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return 1;
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}
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static int
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fbmulti_subbuf_prev(struct fastbuf *f)
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{
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// Called only when seeking, assuming everything seekable
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struct subbuf *prev = clist_prev(&FB_MULTI(f)->subbufs, &FB_MULTI(f)->cur->n);
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ASSERT(prev);
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// Set pos to beginning, flush offset
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bsetpos(prev->fb, 0);
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prev->offset = 0;
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// Set the pointers
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FB_MULTI(f)->cur = prev;
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fbmulti_get_ptrs(f);
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return 1;
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}
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static int
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fbmulti_refill(struct fastbuf *f)
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{
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fbmulti_set_ptrs(f);
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// Refill the subbuf
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uint len = FB_MULTI(f)->cur->fb->refill(FB_MULTI(f)->cur->fb);
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if (len)
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{
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fbmulti_get_ptrs(f);
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return len;
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}
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// Current buf returned EOF
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// Take the next one if exists and redo
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if (fbmulti_subbuf_next(f))
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return fbmulti_refill(f);
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else
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return 0;
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}
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static int
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fbmulti_seek(struct fastbuf *f, ucw_off_t pos, int whence)
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{
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fbmulti_set_ptrs(f);
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switch(whence)
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{
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case SEEK_SET:
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if (pos > FB_MULTI(f)->len)
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bthrow(f, "seek", "Seek out of range");
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while (pos > FB_MULTI(f)->cur->end) // Moving forward
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{
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int r = fbmulti_subbuf_next(f);
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ASSERT(r);
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}
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while (pos < FB_MULTI(f)->cur->begin) // Moving backwards
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{
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int r = fbmulti_subbuf_prev(f);
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ASSERT(r);
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}
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// Now cur is the right buffer.
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FB_MULTI(f)->cur->fb->seek(FB_MULTI(f)->cur->fb, (pos - FB_MULTI(f)->cur->begin), SEEK_SET);
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fbmulti_get_ptrs(f);
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return 1;
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case SEEK_END:
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return fbmulti_seek(f, FB_MULTI(f)->len + pos, SEEK_SET);
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default:
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ASSERT(0);
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}
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}
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static void
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fbmulti_close(struct fastbuf *f)
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{
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CLIST_FOR_EACH(struct subbuf *, n, FB_MULTI(f)->subbufs)
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bclose(n->fb);
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mp_delete(FB_MULTI(f)->mp);
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}
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struct fastbuf *
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fbmulti_create(void)
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{
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struct mempool *mp = mp_new(1024);
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struct fastbuf *fb_out = mp_alloc_zero(mp, sizeof(struct fb_multi));
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struct fb_multi *fbm = FB_MULTI(fb_out);
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fbm->mp = mp;
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fbm->len = 0;
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clist_init(&fbm->subbufs);
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fb_out->name = FB_MULTI_NAME;
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fb_out->refill = fbmulti_refill;
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fb_out->seek = fbmulti_seek;
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fb_out->close = fbmulti_close;
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return fb_out;
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}
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void
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fbmulti_append(struct fastbuf *f, struct fastbuf *fb)
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{
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struct subbuf *last = clist_tail(&FB_MULTI(f)->subbufs);
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struct subbuf *sb = mp_alloc(FB_MULTI(f)->mp, sizeof(*sb));
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sb->fb = fb;
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clist_add_tail(&FB_MULTI(f)->subbufs, &(sb->n));
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ASSERT(fb->refill);
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if (fb->seek)
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{
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if (f->seek)
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{
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sb->begin = last ? last->end : 0;
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bseek(fb, 0, SEEK_END);
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FB_MULTI(f)->len = sb->end = sb->begin + btell(fb);
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}
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bsetpos(fb, 0);
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}
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else
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{
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f->seek = NULL;
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sb->offset = btell(fb);
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sb->begin = 0;
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sb->end = 0;
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}
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if (!last)
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{
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FB_MULTI(f)->cur = sb;
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fbmulti_get_ptrs(f);
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}
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}
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void
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fbmulti_remove(struct fastbuf *f, struct fastbuf *fb)
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{
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bflush(f);
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if (fb)
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{
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CLIST_FOR_EACH(struct subbuf *, n, FB_MULTI(f)->subbufs)
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if (fb == n->fb)
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{
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clist_remove(&(n->n));
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return;
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}
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die("Given fastbuf %p not in given fbmulti %p", fb, f);
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}
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else
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clist_init(&FB_MULTI(f)->subbufs);
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}
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#ifdef TEST
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int main(int argc, char **argv)
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{
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if (argc < 2)
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{
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fprintf(stderr, "You must specify a test (r, m, i, n)\n");
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return 1;
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}
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switch (*argv[1])
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{
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case 'r':
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{
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char *data[] = { "One\nLine", "Two\nLines", "Th\nreeLi\nnes\n" };
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struct fastbuf fb[ARRAY_SIZE(data)];
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for (uint i=0;i<ARRAY_SIZE(data);i++)
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fbbuf_init_read(&fb[i], data[i], strlen(data[i]), 0);
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struct fastbuf *f = fbmulti_create();
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fbmulti_append(f, &fb[0]);
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fbmulti_append(f, &fb[1]);
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fbmulti_append(f, &fb[2]);
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char buffer[9];
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while (bgets(f, buffer, 9))
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puts(buffer);
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bclose(f);
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break;
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}
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case 'm':
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{
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char *data[] = { "Mnl", "ige" };
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struct fastbuf fb[ARRAY_SIZE(data)];
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for (uint i=0;i<ARRAY_SIZE(data);i++)
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fbbuf_init_read(&fb[i], data[i], strlen(data[i]), 0);
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struct fastbuf *f = fbmulti_create();
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fbmulti_append(f, &fb[0]);
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fbmulti_append(f, &fb[1]);
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int pos[] = {0, 3, 1, 4, 2, 5};
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for (uint i=0;i<ARRAY_SIZE(pos);i++)
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{
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bsetpos(f, pos[i]);
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putchar(bgetc(f));
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}
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bclose(f);
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break;
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}
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case 'i':
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{
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char *data = "Insae";
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struct fastbuf fb[4];
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fbbuf_init_read(&fb[0], data, 1, 0);
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fbbuf_init_read(&fb[1], data + 1, 1, 0);
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fbbuf_init_read(&fb[2], data + 2, 2, 0);
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fbbuf_init_read(&fb[3], data + 4, 1, 0);
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struct fastbuf *f = fbmulti_create();
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fbmulti_append(f, &fb[0]);
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fbmulti_append(f, &fb[1]);
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fbmulti_append(f, &fb[2]);
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fbmulti_append(f, &fb[1]);
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fbmulti_append(f, &fb[3]);
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char buffer[9];
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while(bgets(f, buffer, 9))
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puts(buffer);
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bclose(f);
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break;
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}
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case 'n':
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{
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char *data[] = { "Nested", "Data", "As", "In", "Real", "Usage", };
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struct fastbuf fb[ARRAY_SIZE(data)];
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for (uint i=0;i<ARRAY_SIZE(data);i++)
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fbbuf_init_read(&fb[i], data[i], strlen(data[i]), 0);
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struct fastbuf sp;
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fbbuf_init_read(&sp, " ", 1, 0);
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struct fastbuf nl;
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fbbuf_init_read(&nl, "\n", 1, 0);
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struct fastbuf *f = fbmulti_create();
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struct fastbuf *ff;
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ff = fbmulti_create();
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fbmulti_append(ff, &fb[0]);
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fbmulti_append(ff, &sp);
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fbmulti_append(ff, &fb[1]);
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fbmulti_append(f, ff);
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fbmulti_append(f, &nl);
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ff = fbmulti_create();
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fbmulti_append(ff, &fb[2]);
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fbmulti_append(ff, &sp);
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fbmulti_append(ff, &fb[3]);
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fbmulti_append(f, ff);
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fbmulti_append(f, &nl);
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ff = fbmulti_create();
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fbmulti_append(ff, &fb[4]);
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fbmulti_append(ff, &sp);
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fbmulti_append(ff, &fb[5]);
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fbmulti_append(f, ff);
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fbmulti_append(f, &nl);
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char buffer[20];
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while (bgets(f, buffer, 20))
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puts(buffer);
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bclose(f);
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break;
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}
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}
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return 0;
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}
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#endif
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