1 /*-------------------------------------------------------------------------
2  *
3  *	  BIG5 <--> UTF8
4  *
5  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
6  * Portions Copyright (c) 1994, Regents of the University of California
7  *
8  * IDENTIFICATION
9  *	  src/backend/utils/mb/conversion_procs/utf8_and_big5/utf8_and_big5.c
10  *
11  *-------------------------------------------------------------------------
12  */
13 
14 #include "postgres.h"
15 #include "fmgr.h"
16 #include "mb/pg_wchar.h"
17 #include "../../Unicode/big5_to_utf8.map"
18 #include "../../Unicode/utf8_to_big5.map"
19 
20 PG_MODULE_MAGIC;
21 
22 PG_FUNCTION_INFO_V1(big5_to_utf8);
23 PG_FUNCTION_INFO_V1(utf8_to_big5);
24 
25 /* ----------
26  * conv_proc(
27  *		INTEGER,	-- source encoding id
28  *		INTEGER,	-- destination encoding id
29  *		CSTRING,	-- source string (null terminated C string)
30  *		CSTRING,	-- destination string (null terminated C string)
31  *		INTEGER,	-- source string length
32  *		BOOL		-- if true, don't throw an error if conversion fails
33  * ) returns INTEGER;
34  *
35  * Returns the number of bytes successfully converted.
36  * ----------
37  */
38 Datum
39 big5_to_utf8(PG_FUNCTION_ARGS)
40 {
41 	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
42 	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
43 	int			len = PG_GETARG_INT32(4);
44 	bool		noError = PG_GETARG_BOOL(5);
45 	int			converted;
46 
47 	CHECK_ENCODING_CONVERSION_ARGS(PG_BIG5, PG_UTF8);
48 
49 	converted = LocalToUtf(src, len, dest,
50 						   &big5_to_unicode_tree,
51 						   NULL, 0,
52 						   NULL,
53 						   PG_BIG5,
54 						   noError);
55 
56 	PG_RETURN_INT32(converted);
57 }
58 
59 Datum
60 utf8_to_big5(PG_FUNCTION_ARGS)
61 {
62 	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
63 	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
64 	int			len = PG_GETARG_INT32(4);
65 	bool		noError = PG_GETARG_BOOL(5);
66 	int			converted;
67 
68 	CHECK_ENCODING_CONVERSION_ARGS(PG_UTF8, PG_BIG5);
69 
70 	converted = UtfToLocal(src, len, dest,
71 						   &big5_from_unicode_tree,
72 						   NULL, 0,
73 						   NULL,
74 						   PG_BIG5,
75 						   noError);
76 
77 	PG_RETURN_INT32(converted);
78 }
79