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2 months ago
/*
* UCW Library -- Charset Conversion Wrapper for Fast Buffered I/O
*
* (c) 2003--2005 Martin Mares <mj@ucw.cz>
*
* This software may be freely distributed and used according to the terms
* of the GNU Lesser General Public License.
*/
#include <ucw/lib.h>
#include <ucw/fastbuf.h>
#include <charset/charconv.h>
#include <charset/fb-charconv.h>
#define BUFSIZE 1024
struct fb_charconv {
struct fastbuf fb;
struct fastbuf *orig;
struct conv_context ctxt;
byte buf[BUFSIZE];
};
#define FB_CC(f) ((struct fb_charconv *)(f))
static void
fb_cc_spout(struct fastbuf *f)
{
struct conv_context *ct = &FB_CC(f)->ctxt;
int flags;
ct->source = f->buffer;
ct->source_end = f->bptr;
do
{
flags = conv_run(ct);
if (ct->dest > ct->dest_start)
bdirect_write_commit(FB_CC(f)->orig, ct->dest);
uint l = bdirect_write_prepare(FB_CC(f)->orig, &ct->dest_start);
ct->dest = ct->dest_start;
ct->dest_end = ct->dest + l;
}
while (!(flags & CONV_SOURCE_END));
f->bptr = f->buffer;
}
static int
fb_cc_refill(struct fastbuf *f)
{
struct conv_context *ct = &FB_CC(f)->ctxt;
int flags;
f->bptr = f->bstop = f->buffer;
do
{
byte *src;
uint len = bdirect_read_prepare(FB_CC(f)->orig, &src);
if (!len)
break;
ct->source = src;
ct->source_end = ct->source + len;
ct->dest = ct->dest_start = f->bstop;
ct->dest_end = f->bufend;
flags = conv_run(ct);
bdirect_read_commit(FB_CC(f)->orig, (byte*)ct->source);
f->bstop = ct->dest;
}
while (!(flags & CONV_DEST_END));
return (f->bstop > f->bptr);
}
static void
fb_cc_close(struct fastbuf *f)
{
bflush(FB_CC(f)->orig);
xfree(f);
}
struct fastbuf *
fb_wrap_charconv_out(struct fastbuf *f, int cs_from, int cs_to)
{
if (cs_from == cs_to)
return f;
struct fastbuf *g = xmalloc_zero(sizeof(struct fb_charconv));
FB_CC(g)->orig = f;
conv_init(&FB_CC(g)->ctxt);
conv_set_charset(&FB_CC(g)->ctxt, cs_from, cs_to);
g->name = "<charconv-out>";
g->spout = fb_cc_spout;
g->close = fb_cc_close;
g->buffer = g->bstop = g->bptr = FB_CC(g)->buf;
g->bufend = g->buffer + BUFSIZE;
return g;
}
struct fastbuf *
fb_wrap_charconv_in(struct fastbuf *f, int cs_from, int cs_to)
{
if (cs_from == cs_to)
return f;
struct fastbuf *g = xmalloc_zero(sizeof(struct fb_charconv));
FB_CC(g)->orig = f;
conv_init(&FB_CC(g)->ctxt);
conv_set_charset(&FB_CC(g)->ctxt, cs_from, cs_to);
g->name = "<charconv-in>";
g->refill = fb_cc_refill;
g->close = fb_cc_close;
g->buffer = g->bstop = g->bptr = FB_CC(g)->buf;
g->bufend = g->buffer + BUFSIZE;
return g;
}