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61 lines
1.2 KiB
61 lines
1.2 KiB
2 months ago
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/*
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* UCW Library -- Character Conversion with Allocation on the Stack
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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/stk-charconv.h>
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#include <string.h>
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#define INITIAL_MIN_SIZE 16
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#define INITIAL_SCALE 2
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uint
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stk_strconv_init(struct conv_context *c, const byte *s, uint in_cs, uint out_cs)
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{
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uint l = strlen(s);
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if (in_cs == out_cs)
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{
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c->source = s;
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c->source_end = NULL;
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return l + 1;
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}
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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 + 1;
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if (l < (INITIAL_MIN_SIZE - 1) / INITIAL_SCALE)
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return INITIAL_MIN_SIZE;
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else
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return l * INITIAL_SCALE + 1;
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}
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uint
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stk_strconv_step(struct conv_context *c, byte *buf, uint len)
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{
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if (!c->source_end)
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{
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memcpy(buf, c->source, len);
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c->dest_start = buf;
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return 0;
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}
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if (c->dest_start)
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{
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uint l = c->dest_end - c->dest_start;
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memcpy(buf, c->dest_start, l);
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c->dest = buf + l;
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}
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else
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c->dest = buf;
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c->dest_start = buf;
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c->dest_end = buf + len;
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if (conv_run(c) & CONV_SOURCE_END)
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return 0;
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return len << 1;
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}
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