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50 lines
1.1 KiB
50 lines
1.1 KiB
/*
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* UCW Library -- Character Conversion with Allocation on a Memory Pool
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*
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* (c) 2006 Pavel Charvat <pchar@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 <charset/mp-charconv.h>
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#include <string.h>
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#include <alloca.h>
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byte *
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mp_strconv(struct mempool *mp, const byte *s, uint in_cs, uint out_cs)
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{
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if (in_cs == out_cs)
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return mp_strdup(mp, s);
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struct conv_context c;
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char *b[32];
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uint bs[32], n = 0, sum = 0;
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uint l = strlen(s) + 1;
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conv_init(&c);
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conv_set_charset(&c, in_cs, out_cs);
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c.source = s;
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c.source_end = s + l;
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for (;;)
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{
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l <<= 1;
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c.dest_start = c.dest = b[n] = alloca(l);
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c.dest_end = c.dest_start+ l;
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uint r = conv_run(&c);
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sum += bs[n++] = c.dest - c.dest_start;
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if (r & CONV_SOURCE_END)
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{
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c.dest_start = c.dest = mp_alloc(mp, sum);
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for (uint i = 0; i < n; i++)
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{
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memcpy(c.dest, b[i], bs[i]);
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c.dest += bs[i];
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}
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return c.dest_start;
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}
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}
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}
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