patch-2.4.0-test5 linux/fs/nls/nls_euc-jp.c

• Lines: 163
• Date: Tue Jul 18 22:48:33 2000
• Orig file: v2.4.0-test4/linux/fs/nls/nls_euc-jp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test4/linux/fs/nls/nls_euc-jp.c linux/fs/nls/nls_euc-jp.c
@@ -0,0 +1,162 @@
+/*
+ * linux/fs/nls_euc-jp.c
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/nls.h>
+#include <linux/errno.h>
+
+static struct nls_table *p_nls = NULL;
+
+
+#define SS2		(0x8E)		/* Single Shift 2 */
+#define SS3		(0x8F)		/* Single Shift 3 */
+
+static int uni2char(const wchar_t uni,
+			unsigned char *out, int boundlen)
+{
+	int n;
+
+	if ( !p_nls )
+ 		return -EINVAL;
+	if ( (n = p_nls->uni2char(uni, out, boundlen)) < 0)
+		return n;
+	
+	/* translate SJIS into EUC-JP */
+	if (n == 1) {
+		/* JIS X 201 KANA */
+		if (0xA1 <= out[0] && out[0] <= 0xDF) {
+			if (boundlen <= 1)
+				return -ENAMETOOLONG;
+			out[1] = out[0];
+			out[0] = SS2;
+			n = 2;    
+		}
+	} else if (n == 2) { 
+		/* JIS X 208 */
+
+		/* SJIS codes 0xF0xx to 0xFFxx are machine-dependent codes and user-defining characters */
+		if (out[0] >= 0xF0) {
+			out[0] = 0x81;  /* 'GETA' with SJIS coding */
+			out[1] = 0xAC;
+		}
+
+		out[0] = (out[0]^0xA0)*2 + 0x5F;
+		if (out[1] > 0x9E)
+			out[0]++; 
+		
+		if (out[1] < 0x7F)
+			out[1] = out[1] + 0x61;
+		else if (out[1] < 0x9F)
+			out[1] = out[1] + 0x60;
+		else
+			out[1] = out[1] + 0x02;
+	}
+	else
+		return -EINVAL;
+
+	return n;
+}
+
+static int char2uni(const unsigned char *rawstring, int boundlen,
+				wchar_t *uni)
+{
+	unsigned char sjis_temp[2];
+	int euc_offset, n;
+	
+	if ( !p_nls )
+		return -EINVAL;
+	if (boundlen <= 0)
+		return -ENAMETOOLONG;
+
+	if (boundlen == 1) {
+		*uni = rawstring[0];
+		return 1;
+	}
+
+	/* translate EUC-JP into SJIS */
+	if (rawstring[0] > 0x7F) {
+		if (rawstring[0] == SS2) {
+			/* JIS X 201 KANA */
+			sjis_temp[0] = rawstring[1];
+			sjis_temp[1] = 0x00;
+			euc_offset = 2;
+		} else if (rawstring[0] == SS3) {
+			/* JIS X 212 */
+			sjis_temp[0] = 0x81; /* 'GETA' with SJIS coding */
+			sjis_temp[1] = 0xAC;
+			euc_offset = 3;
+		} else { 
+			/* JIS X 208 */
+			sjis_temp[0] = ((rawstring[0]-0x5f)/2) ^ 0xA0;
+			if (!(rawstring[0]&1))
+				sjis_temp[1] = rawstring[1] - 0x02;
+			else if (rawstring[1] < 0xE0)
+				sjis_temp[1] = rawstring[1] - 0x61;
+			else
+				sjis_temp[1] = rawstring[1] - 0x60;
+			euc_offset = 2;
+		}
+	} else { 
+		/* JIS X 201 ROMAJI */
+		sjis_temp[0] = rawstring[0];
+		sjis_temp[1] = rawstring[1];
+		euc_offset = 1;
+	}
+
+	if ( (n = p_nls->char2uni(sjis_temp, boundlen, uni)) < 0)
+		return n;
+
+	return euc_offset;
+}
+
+static struct nls_table table = {
+	"euc-jp",
+	uni2char,
+	char2uni,
+	NULL,
+	NULL,
+	THIS_MODULE,
+};
+
+static int __init init_nls_euc_jp(void)
+{
+	p_nls = load_nls("cp932");
+
+	if (p_nls) {
+		table.charset2upper = p_nls->charset2upper;
+		table.charset2lower = p_nls->charset2lower;
+		return register_nls(&table);
+	}
+
+	return -EINVAL;
+}
+
+static void __exit exit_nls_euc_jp(void)
+{
+	unregister_nls(&table);
+	unload_nls(p_nls);
+}
+
+module_init(init_nls_euc_jp)
+module_exit(exit_nls_euc_jp)
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ *
+---------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 8
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -8
+ * c-argdecl-indent: 8
+ * c-label-offset: -8
+ * c-continued-statement-offset: 8
+ * c-continued-brace-offset: 0
+ * End:
+ */