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104 lines
2.2 KiB
104 lines
2.2 KiB
3 months ago
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/*
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* UCW Library -- I/O Wrapper for Hexadecimal Escaped Debugging Output
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*
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* (c) 2015 Martin Mares <mj@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/chartype.h>
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#include <ucw/fastbuf.h>
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#include <ucw/fw-hex.h>
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#define HEX_BUFSIZE 1024
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struct fb_hex {
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struct fastbuf fb;
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struct fastbuf *orig;
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byte buf[HEX_BUFSIZE];
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};
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#define FB_HEX(f) ((struct fb_hex *)(f))
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static void
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fb_hex_spout(struct fastbuf *f)
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{
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struct fastbuf *orig = FB_HEX(f)->orig;
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for (byte *p = f->buffer; p < f->bptr; p++)
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{
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uint c = *p;
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if (c >= 0x21 && c <= 0x7e && c != '<' && c != '>')
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bputc(orig, c);
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else
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bprintf(orig, "<%02x>", c);
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}
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f->bptr = f->buffer;
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}
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static int
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fb_hex_refill(struct fastbuf *f)
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{
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struct fastbuf *orig = FB_HEX(f)->orig;
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f->bptr = f->bstop = f->buffer;
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while (f->bstop < f->bufend)
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{
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int c = bgetc(orig);
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if (c < 0)
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break;
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if (c == '<')
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{
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uint x = 0;
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for (int i=0; i<2; i++)
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{
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int d = bgetc(orig);
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if (!Cxdigit(d))
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bthrow(f, "fbhex", "fb_hex: Malformed hexadecimal representation");
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x = (x << 4) | Cxvalue(d);
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}
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c = bgetc(orig);
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if (c != '>')
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bthrow(f, "fbhex", "fb_hex: Expecting '>'");
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*f->bstop++ = x;
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}
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else
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*f->bstop++ = c;
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}
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return (f->bstop > f->bptr);
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}
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static void
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fb_hex_close(struct fastbuf *f)
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{
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if (f->spout)
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bputc(FB_HEX(f)->orig, '\n');
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bflush(FB_HEX(f)->orig);
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xfree(f);
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}
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struct fastbuf *fb_wrap_hex_out(struct fastbuf *f)
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{
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struct fastbuf *g = xmalloc_zero(sizeof(struct fb_hex));
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FB_HEX(g)->orig = f;
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g->name = "<hex-out>";
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g->spout = fb_hex_spout;
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g->close = fb_hex_close;
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g->buffer = g->bstop = g->bptr = FB_HEX(g)->buf;
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g->bufend = g->buffer + HEX_BUFSIZE;
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return g;
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}
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struct fastbuf *fb_wrap_hex_in(struct fastbuf *f)
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{
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struct fastbuf *g = xmalloc_zero(sizeof(struct fb_hex));
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FB_HEX(g)->orig = f;
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g->name = "<hex-in>";
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g->refill = fb_hex_refill;
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g->close = fb_hex_close;
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g->buffer = g->bstop = g->bptr = FB_HEX(g)->buf;
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g->bufend = g->buffer + HEX_BUFSIZE;
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return g;
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}
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