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92 lines
1.6 KiB
92 lines
1.6 KiB
3 months ago
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/*
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* UCW Library -- Hexdumping and Unhexdumping
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*
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* (c) 2008 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/string.h>
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#include <ucw/chartype.h>
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static uint
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hex_make(uint x)
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{
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return (x < 10) ? (x + '0') : (x - 10 + 'a');
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}
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void
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mem_to_hex(char *dest, const byte *src, size_t bytes, uint flags)
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{
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uint sep = flags & 0xff;
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while (bytes--)
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{
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dest[0] = hex_make(*src >> 4);
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dest[1] = hex_make(*src & 0x0f);
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if (flags & MEM_TO_HEX_UPCASE)
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{
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dest[0] = Cupcase(dest[0]);
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dest[1] = Cupcase(dest[1]);
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}
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dest += 2;
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if (sep && bytes)
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*dest++ = sep;
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src++;
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}
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*dest = 0;
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}
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static uint
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hex_parse(uint c)
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{
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c = Cupcase(c);
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c -= '0';
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return (c < 10) ? c : (c - 7);
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}
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const char *
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hex_to_mem(byte *dest, const char *src, size_t max_bytes, uint flags)
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{
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uint sep = flags & 0xff;
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while (max_bytes-- && Cxdigit(src[0]) && Cxdigit(src[1]))
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{
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*dest++ = (hex_parse(src[0]) << 4) | hex_parse(src[1]);
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src += 2;
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if (sep && *src && max_bytes)
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{
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if (*src != (char)sep)
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return src;
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src++;
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}
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}
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return src;
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}
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#ifdef TEST
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#include <stdio.h>
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int main(void)
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{
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byte x[4] = { 0xfe, 0xed, 0xf0, 0x0d };
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byte y[4];
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char a[16];
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mem_to_hex(a, x, 4, MEM_TO_HEX_UPCASE);
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puts(a);
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mem_to_hex(a, x, 4, ':');
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puts(a);
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const char *z = hex_to_mem(y, a, 4, ':');
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if (*z)
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puts("BAD");
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else
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printf("%02x%02x%02x%02x\n", y[0], y[1], y[2], y[3]);
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return 0;
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}
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#endif
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