summaryrefslogtreecommitdiff
path: root/support/dktools/dk4rec05.ctr
blob: e20aff795b3367ccca12f9edfe7321a7a587515e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd


%%	header

/**	@file
	String recoding from ANSI to UTF-8.

	CRT on Windows: Not used.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**	Recode string from ANSI to UTF-8.
	@param	dstb	Destination buffer.
	@param	szdstb	Size of destination buffer (number of bytes).
	@param	src	Source string to convert.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
	
	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if src or dstb is NULL or szdstb is 0,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if dstb is too small,
	- DK4_E_SYNTAX<br>
	  with the number of successfully recoded characters in nelem if a
	  non-recodable character was found.
*/
int
dk4recode_ansi_to_utf8(
  char *dstb, size_t szdstb, const char *src, dk4_er_t *erp
);

/**	Calculate required buffer size (including final 0x00 byte)
	for ANSI to UTF-8 conversion.
	@param	src	ANSI encoded source string.
	@param	erp	Error report, may be NULL.
	@return	Positive buffer size on success, 0 on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if src is NULL,
	- DK4_E_SYNTAX<br>
	  if there are encoding errors,
	- DK4_E_MATH_OVERFLOW<br>
	  if a numeric overflow occured in size calculation.
*/
size_t
dk4recode_size_ansi_to_utf8(const char *src, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif


%%	module

#include "dk4rec05.h"
#include "dk4mem.h"
#include "dk4ansi.h"
#include "dk4utf8.h"



size_t
dk4recode_size_ansi_to_utf8(const char *src, dk4_er_t *erp)
{
  dk4_er_t	 er;		/* Internal error report */
  unsigned char	 buf[8];	/* Current character UTF-8 encoded */
  size_t	 rdb	= 0;	/* Number of bytes read from input */
  size_t	 back	= 0;	/* Function result */
  size_t	 sz;		/* Size of UTF-8 encoded current character */
  dk4_c32_t	 c32;		/* Current 32 bit character */
  unsigned char	 uc;		/* Current source character */

  if (NULL != src) {
    dk4error_init(&er);
    while ('\0' != *src) {
      uc = (unsigned char)(*(src++));
      rdb++;
      if (0 != dk4ansi_decode(&c32, uc)) {
        sz = sizeof(buf);
	if (0 != dk4utf8_encode(buf, &sz, c32, &er)) {
	  if ((SIZE_MAX - sz) < back) {
	    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); 
	  }
	  back += sz;
	} else {
	  dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
	}
      } else {
        dk4error_set_elsize_nelem(&er, DK4_E_SYNTAX, 1, rdb);
      }
    }
    if (SIZE_MAX == back) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
    back++;
    if (DK4_E_NONE != er.ec) {
      back = 0;
      dk4error_copy(erp, &er);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



int
dk4recode_ansi_to_utf8(
  char *dstb, size_t szdstb, const char *src, dk4_er_t *erp
)
{
  unsigned char	 buf[8];
  size_t	 sz;
  size_t	 used	=	0;
  size_t	 rdb	=	0;
  dk4_c32_t	 c32	=	dkC32(0);
  int		 back	=	0;

  if ((NULL != dstb) && (NULL != src) && (0 < szdstb)) {
    back = 1;
    while (('\0' != *src) && (1 == back) && (used < szdstb)) {
      if (0 != dk4ansi_decode(&c32, (unsigned char)(*(src++)))) {
        sz = sizeof(buf);
	if (0 != dk4utf8_encode(buf, &sz, c32, erp)) {
	  if ((szdstb - used) > sz) {
	    DK4_MEMCPY(&(dstb[used]),buf,sz);
	    used += sz;
	  } else {
	    back = 0;
	    dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
	  }
	} else {
	  back = 0;
	  dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
	}
      } else {
        back = 0;
	dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 1, rdb);
      }
      if (0 != back) { rdb++; }
    }
    if (used < szdstb) {
      dstb[used] = '\0';
    } else {
      dstb[szdstb - 1] = '\0';
      back = 0;
      dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}