src/ucs4.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2011 Index Data
   3  * See the file LICENSE for details.
   4  */
   5 /**
   6  * \file
   7  * \brief UCS4 decoding and encoding
   8  */
   9
  10 #if HAVE_CONFIG_H
  11 #include <config.h>
  12 #endif
  13
  14 #include <assert.h>
  15 #include <errno.h>
  16 #include <string.h>
  17
  18 #include "iconv-p.h"
  19
  20 static unsigned long read_UCS4(yaz_iconv_t cd, yaz_iconv_decoder_t d,
  21                                unsigned char *inp,
  22                                size_t inbytesleft, size_t *no_read)
  23 {
  24     unsigned long x = 0;
  25
  26     if (inbytesleft < 4)
  27     {
  28         yaz_iconv_set_errno(cd, YAZ_ICONV_EINVAL); /* incomplete input */
  29         *no_read = 0;
  30     }
  31     else
  32     {
  33         x = (inp[0]<<24) | (inp[1]<<16) | (inp[2]<<8) | inp[3];
  34         *no_read = 4;
  35     }
  36     return x;
  37 }
  38
  39 static unsigned long read_UCS4LE(yaz_iconv_t cd, yaz_iconv_decoder_t d,
  40                                  unsigned char *inp,
  41                                  size_t inbytesleft, size_t *no_read)
  42 {
  43     unsigned long x = 0;
  44
  45     if (inbytesleft < 4)
  46     {
  47         yaz_iconv_set_errno(cd, YAZ_ICONV_EINVAL); /* incomplete input */
  48         *no_read = 0;
  49     }
  50     else
  51     {
  52         x = (inp[3]<<24) | (inp[2]<<16) | (inp[1]<<8) | inp[0];
  53         *no_read = 4;
  54     }
  55     return x;
  56 }
  57
  58 static size_t write_UCS4(yaz_iconv_t cd, yaz_iconv_encoder_t en,
  59                          unsigned long x,
  60                          char **outbuf, size_t *outbytesleft)
  61 {
  62     unsigned char *outp = (unsigned char *) *outbuf;
  63     if (*outbytesleft >= 4)
  64     {
  65         *outp++ = (unsigned char) (x>>24);
  66         *outp++ = (unsigned char) (x>>16);
  67         *outp++ = (unsigned char) (x>>8);
  68         *outp++ = (unsigned char) x;
  69         (*outbytesleft) -= 4;
  70     }
  71     else
  72     {
  73         yaz_iconv_set_errno(cd, YAZ_ICONV_E2BIG);
  74         return (size_t)(-1);
  75     }
  76     *outbuf = (char *) outp;
  77     return 0;
  78 }
  79
  80 static size_t write_UCS4LE(yaz_iconv_t cd, yaz_iconv_encoder_t en,
  81                            unsigned long x,
  82                            char **outbuf, size_t *outbytesleft)
  83 {
  84     unsigned char *outp = (unsigned char *) *outbuf;
  85     if (*outbytesleft >= 4)
  86     {
  87         *outp++ = (unsigned char) x;
  88         *outp++ = (unsigned char) (x>>8);
  89         *outp++ = (unsigned char) (x>>16);
  90         *outp++ = (unsigned char) (x>>24);
  91         (*outbytesleft) -= 4;
  92     }
  93     else
  94     {
  95         yaz_iconv_set_errno(cd, YAZ_ICONV_E2BIG);
  96         return (size_t)(-1);
  97     }
  98     *outbuf = (char *) outp;
  99     return 0;
 100 }
 101
 102
 103 yaz_iconv_encoder_t yaz_ucs4_encoder(const char *tocode,
 104                                      yaz_iconv_encoder_t e)
 105
 106 {
 107     if (!yaz_matchstr(tocode, "UCS4"))
 108         e->write_handle = write_UCS4;
 109     else if (!yaz_matchstr(tocode, "UCS4LE"))
 110         e->write_handle = write_UCS4LE;
 111     else
 112         return 0;
 113     return e;
 114 }
 115
 116 yaz_iconv_decoder_t yaz_ucs4_decoder(const char *tocode,
 117                                      yaz_iconv_decoder_t d)
 118
 119 {
 120     if (!yaz_matchstr(tocode, "UCS4"))
 121         d->read_handle = read_UCS4;
 122     else if (!yaz_matchstr(tocode, "UCS4LE"))
 123         d->read_handle = read_UCS4LE;
 124     else
 125         return 0;
 126     return d;
 127 }
 128
 129
 130
 131 /*
 132  * Local variables:
 133  * c-basic-offset: 4
 134  * c-file-style: "Stroustrup"
 135  * indent-tabs-mode: nil
 136  * End:
 137  * vim: shiftwidth=4 tabstop=8 expandtab
 138  */
 139