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tdsiconv.h

00001 /* FreeTDS - Library of routines accessing Sybase and Microsoft databases
00002  * Copyright (C) 2002, 2003, 2004  Brian Bruns
00003  *
00004  * This library is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Library General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2 of the License, or (at your option) any later version.
00008  *
00009  * This library is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Library General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Library General Public
00015  * License along with this library; if not, write to the
00016  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00017  * Boston, MA 02111-1307, USA.
00018  */
00019 
00020 #ifndef _tds_iconv_h_
00021 #define _tds_iconv_h_
00022 
00023 static const char rcsid_tds_iconv_h[] = "$Id: tdsiconv.h,v 1.33 2004/10/28 12:42:12 freddy77 Exp $";
00024 static const void *const no_unused_tds_iconv_h_warn[] = { rcsid_tds_iconv_h, no_unused_tds_iconv_h_warn };
00025 
00026 #if HAVE_ICONV
00027 #include <iconv.h>
00028 #else
00029 /* Define iconv_t for src/replacements/iconv.c. */
00030 #undef iconv_t
00031 typedef void *iconv_t;
00032 #endif /* HAVE_ICONV */
00033 
00034 #if HAVE_ERRNO_H
00035 #include <errno.h>
00036 #endif
00037 
00038 #if HAVE_WCHAR_H
00039 #include <wchar.h>
00040 #endif
00041 
00042 /* The following EILSEQ advice is borrowed verbatim from GNU iconv.  */
00043 /* Some systems, like SunOS 4, don't have EILSEQ. Some systems, like BSD/OS,
00044    have EILSEQ in a different header.  On these systems, define EILSEQ
00045    ourselves. */
00046 #ifndef EILSEQ
00047 # define EILSEQ ENOENT
00048 #endif
00049 
00050 #if HAVE_STDLIB_H
00051 #include <stdlib.h>
00052 #endif /* HAVE_STDLIB_H */
00053 
00054 #ifdef __cplusplus
00055 extern "C"
00056 {
00057 #endif
00058 
00059 #if ! HAVE_ICONV
00060 
00061         /* FYI, the first 4 entries look like this:
00062          *      {"ISO-8859-1",  1, 1}, -> 0
00063          *      {"US-ASCII",    1, 4}, -> 1
00064          *      {"UCS-2LE",     2, 2}, -> 2
00065          *      {"UCS-2BE",     2, 2}, -> 3
00066          *
00067          * These conversions are supplied by src/replacements/iconv.c for the sake of those who don't 
00068          * have or otherwise need an iconv.
00069          */
00070 enum ICONV_CD_VALUE
00071 {
00072           Like_to_Like = 0x100
00073         , Latin1_ASCII  = 0x01
00074         , ASCII_Latin1  = 0x10
00075 
00076         , Latin1_UCS2LE = 0x02
00077         , UCS2LE_Latin1 = 0x20
00078         , ASCII_UCS2LE  = 0x12
00079         , UCS2LE_ASCII  = 0x21
00080 
00081         , Latin1_UTF8   = 0x03
00082         , UTF8_Latin1   = 0x30
00083         , ASCII_UTF8    = 0x13
00084         , UTF8_ASCII    = 0x31
00085         , UCS2LE_UTF8   = 0x23
00086         , UTF8_UCS2LE   = 0x32
00087         /* these aren't needed 
00088          * , Latin1_UCS2BE = 0x03
00089          * , UCS2BE_Latin1 = 0x30
00090          */
00091 };
00092 
00093 iconv_t tds_sys_iconv_open(const char *tocode, const char *fromcode);
00094 size_t tds_sys_iconv(iconv_t cd, const char **inbuf, size_t * inbytesleft, char **outbuf, size_t * outbytesleft);
00095 int tds_sys_iconv_close(iconv_t cd);
00096 #else
00097 #define tds_sys_iconv_open iconv_open
00098 #define tds_sys_iconv iconv
00099 #define tds_sys_iconv_close iconv_close
00100 #endif /* !HAVE_ICONV */
00101 
00102 
00103 typedef enum
00104 { to_server, to_client } TDS_ICONV_DIRECTION;
00105 
00106 typedef struct _character_set_alias
00107 {
00108         const char *alias;
00109         int canonic;
00110 } CHARACTER_SET_ALIAS;
00111 
00112 typedef struct _tds_errno_message_flags {
00113         unsigned int e2big:1;
00114         unsigned int eilseq:1;
00115         unsigned int einval:1;
00116 } TDS_ERRNO_MESSAGE_FLAGS;
00117 
00118 struct tdsiconvinfo
00119 {
00120         TDS_ENCODING client_charset;
00121         TDS_ENCODING server_charset;
00122 
00123 #define TDS_ENCODING_INDIRECT 1
00124 #define TDS_ENCODING_SWAPBYTE 2
00125 #define TDS_ENCODING_MEMCPY   4
00126         unsigned int flags;
00127 
00128         iconv_t to_wire;        /* conversion from client charset to server's format */
00129         iconv_t from_wire;      /* conversion from server's format to client charset */
00130 
00131         iconv_t to_wire2;       /* conversion from client charset to server's format - indirect */
00132         iconv_t from_wire2;     /* conversion from server's format to client charset - indirect */
00133         
00134         /* 
00135          * Suppress error messages that would otherwise be emitted by tds_iconv().
00136          * Functions that process large buffers ask tds_iconv to convert it in "chunks".
00137          * We don't want to emit spurious EILSEQ errors or multiple errors for one 
00138          * buffer.  tds_iconv() checks this structure before emiting a message, and 
00139          * adds to it whenever it emits one.  Callers that handle a particular situation themselves
00140          * can prepopulate it.  
00141          */ 
00142         TDS_ERRNO_MESSAGE_FLAGS suppress;
00143 };
00144 
00145 /* We use ICONV_CONST for tds_iconv(), even if we don't have iconv() */
00146 #ifndef ICONV_CONST
00147 # define ICONV_CONST const
00148 #endif
00149 
00150 size_t tds_iconv_fread(iconv_t cd, FILE * stream, size_t field_len, size_t term_len, char *outbuf, size_t * outbytesleft);
00151 size_t tds_iconv(TDSSOCKET * tds, const TDSICONV * char_conv, TDS_ICONV_DIRECTION io,
00152                  const char **inbuf, size_t * inbytesleft, char **outbuf, size_t * outbytesleft);
00153 const char *tds_canonical_charset_name(const char *charset_name);
00154 const char *tds_sybase_charset_name(const char *charset_name);
00155 
00156 #ifdef __cplusplus
00157 }
00158 #endif
00159 
00160 #endif /* _tds_iconv_h_ */

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