1 /* This file is part of the YAZ toolkit.
2 * Copyright (C) Index Data
3 * See the file LICENSE for details.
7 * \brief Implements simple ICONV
9 * This implements an interface similar to that of iconv and
10 * is used by YAZ to interface with iconv (if present).
11 * For systems where iconv is not present, this layer
12 * provides a few important conversions: UTF-8, MARC-8, Latin-1.
28 #include <yaz/xmalloc.h>
29 #include <yaz/errno.h>
32 struct yaz_iconv_struct {
36 unsigned long unget_x;
40 struct yaz_iconv_encoder_s encoder;
41 struct yaz_iconv_decoder_s decoder;
45 int yaz_iconv_isbuiltin(yaz_iconv_t cd)
47 return cd->decoder.read_handle && cd->encoder.write_handle;
51 static int prepare_encoders(yaz_iconv_t cd, const char *tocode)
53 if (yaz_marc8_encoder(tocode, &cd->encoder))
55 if (yaz_utf8_encoder(tocode, &cd->encoder))
57 if (yaz_ucs4_encoder(tocode, &cd->encoder))
59 if (yaz_iso_8859_1_encoder(tocode, &cd->encoder))
61 if (yaz_iso_5428_encoder(tocode, &cd->encoder))
63 if (yaz_advancegreek_encoder(tocode, &cd->encoder))
65 if (yaz_wchar_encoder(tocode, &cd->encoder))
67 if (yaz_danmarc_encoder(tocode, &cd->encoder))
72 static int prepare_decoders(yaz_iconv_t cd, const char *tocode)
74 if (yaz_marc8_decoder(tocode, &cd->decoder))
76 if (yaz_iso5426_decoder(tocode, &cd->decoder))
78 if (yaz_utf8_decoder(tocode, &cd->decoder))
80 if (yaz_ucs4_decoder(tocode, &cd->decoder))
82 if (yaz_iso_8859_1_decoder(tocode, &cd->decoder))
84 if (yaz_iso_5428_decoder(tocode, &cd->decoder))
86 if (yaz_advancegreek_decoder(tocode, &cd->decoder))
88 if (yaz_wchar_decoder(tocode, &cd->decoder))
90 if (yaz_danmarc_decoder(tocode, &cd->decoder))
95 yaz_iconv_t yaz_iconv_open(const char *tocode, const char *fromcode)
97 yaz_iconv_t cd = (yaz_iconv_t) xmalloc(sizeof(*cd));
100 cd->encoder.write_handle = 0;
101 cd->encoder.flush_handle = 0;
102 cd->encoder.init_handle = 0;
103 cd->encoder.destroy_handle = 0;
105 cd->decoder.data = 0;
106 cd->decoder.read_handle = 0;
107 cd->decoder.init_handle = 0;
108 cd->decoder.destroy_handle = 0;
110 cd->my_errno = YAZ_ICONV_UNKNOWN;
112 /* a useful hack: if fromcode has leading @,
113 the library not use YAZ's own conversions .. */
114 if (fromcode[0] == '@')
118 prepare_encoders(cd, tocode);
119 prepare_decoders(cd, fromcode);
121 if (cd->decoder.read_handle && cd->encoder.write_handle)
124 cd->iconv_cd = (iconv_t) (-1);
131 cd->iconv_cd = iconv_open(tocode, fromcode);
132 if (cd->iconv_cd == (iconv_t) (-1))
146 size_t yaz_iconv(yaz_iconv_t cd, char **inbuf, size_t *inbytesleft,
147 char **outbuf, size_t *outbytesleft)
153 if (cd->iconv_cd != (iconv_t) (-1))
156 iconv(cd->iconv_cd, inbuf, inbytesleft, outbuf, outbytesleft);
157 if (r == (size_t)(-1))
162 cd->my_errno = YAZ_ICONV_E2BIG;
165 cd->my_errno = YAZ_ICONV_EINVAL;
168 cd->my_errno = YAZ_ICONV_EILSEQ;
171 cd->my_errno = YAZ_ICONV_UNKNOWN;
183 cd->my_errno = YAZ_ICONV_UNKNOWN;
185 if (cd->encoder.init_handle)
186 (*cd->encoder.init_handle)(&cd->encoder);
191 if (cd->decoder.init_handle)
194 size_t r = (cd->decoder.init_handle)(
196 inbuf ? (unsigned char *) *inbuf : 0,
197 inbytesleft ? *inbytesleft : 0,
201 if (cd->my_errno == YAZ_ICONV_EINVAL)
207 *inbytesleft -= no_read;
214 if (!inbuf || !*inbuf)
216 if (outbuf && *outbuf)
219 r = (*cd->encoder.write_handle)(cd, &cd->encoder,
220 cd->unget_x, outbuf, outbytesleft);
221 if (cd->encoder.flush_handle)
222 r = (*cd->encoder.flush_handle)(cd, &cd->encoder,
223 outbuf, outbytesleft);
238 no_read = cd->no_read_x;
242 if (*inbytesleft == 0)
247 x = (*cd->decoder.read_handle)(
249 (unsigned char *) *inbuf, *inbytesleft, &no_read);
258 r = (*cd->encoder.write_handle)(cd, &cd->encoder,
259 x, outbuf, outbytesleft);
262 /* unable to write it. save it because read_handle cannot
264 if (cd->my_errno == YAZ_ICONV_E2BIG)
267 cd->no_read_x = no_read;
273 *inbytesleft -= no_read;
279 int yaz_iconv_error(yaz_iconv_t cd)
284 int yaz_iconv_close(yaz_iconv_t cd)
287 if (cd->iconv_cd != (iconv_t) (-1))
288 iconv_close(cd->iconv_cd);
290 if (cd->encoder.destroy_handle)
291 (*cd->encoder.destroy_handle)(&cd->encoder);
292 if (cd->decoder.destroy_handle)
293 (*cd->decoder.destroy_handle)(&cd->decoder);
298 void yaz_iconv_set_errno(yaz_iconv_t cd, int no)
306 * c-file-style: "Stroustrup"
307 * indent-tabs-mode: nil
309 * vim: shiftwidth=4 tabstop=8 expandtab