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Diffstat (limited to 'fs/nls/nls_base.c')
-rw-r--r--fs/nls/nls_base.c497
1 files changed, 497 insertions, 0 deletions
diff --git a/fs/nls/nls_base.c b/fs/nls/nls_base.c
new file mode 100644
index 000000000..ba0a134e4
--- /dev/null
+++ b/fs/nls/nls_base.c
@@ -0,0 +1,497 @@
+/*
+ * linux/fs/nls.c
+ *
+ * Native language support--charsets and unicode translations.
+ * By Gordon Chaffee 1996, 1997
+ *
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/config.h>
+#include <linux/nls.h>
+#include <linux/malloc.h>
+#ifdef CONFIG_KERNELD
+#include <linux/kerneld.h>
+#endif
+#include <asm/byteorder.h>
+
+static struct nls_table *tables = (struct nls_table *) NULL;
+
+/*
+ * Sample implementation from Unicode home page.
+ * http://www.stonehand.com/unicode/standard/fss-utf.html
+ */
+struct utf8_table {
+ int cmask;
+ int cval;
+ int shift;
+ long lmask;
+ long lval;
+};
+
+static struct utf8_table utf8_table[] =
+{
+ {0x80, 0x00, 0*6, 0x7F, 0, /* 1 byte sequence */},
+ {0xE0, 0xC0, 1*6, 0x7FF, 0x80, /* 2 byte sequence */},
+ {0xF0, 0xE0, 2*6, 0xFFFF, 0x800, /* 3 byte sequence */},
+ {0xF8, 0xF0, 3*6, 0x1FFFFF, 0x10000, /* 4 byte sequence */},
+ {0xFC, 0xF8, 4*6, 0x3FFFFFF, 0x200000, /* 5 byte sequence */},
+ {0xFE, 0xFC, 5*6, 0x7FFFFFFF, 0x4000000, /* 6 byte sequence */},
+ {0, /* end of table */}
+};
+
+int
+utf8_mbtowc(__u16 *p, const __u8 *s, int n)
+{
+ long l;
+ int c0, c, nc;
+ struct utf8_table *t;
+
+ printk("utf8_mbtowc\n");
+ nc = 0;
+ c0 = *s;
+ l = c0;
+ for (t = utf8_table; t->cmask; t++) {
+ nc++;
+ if ((c0 & t->cmask) == t->cval) {
+ l &= t->lmask;
+ if (l < t->lval)
+ return -1;
+ *p = l;
+ return nc;
+ }
+ if (n <= nc)
+ return -1;
+ s++;
+ c = (*s ^ 0x80) & 0xFF;
+ if (c & 0xC0)
+ return -1;
+ l = (l << 6) | c;
+ }
+ return -1;
+}
+
+int
+utf8_mbstowcs(__u16 *pwcs, const __u8 *s, int n)
+{
+ __u16 *op;
+ const __u8 *ip;
+ int size;
+
+ printk("\nutf8_mbstowcs: n=%d\n", n);
+ op = pwcs;
+ ip = s;
+ while (*ip && n > 0) {
+ printk(" %02x", *ip);
+ if (*ip & 0x80) {
+ size = utf8_mbtowc(op, ip, n);
+ if (size == -1) {
+ /* Ignore character and move on */
+ ip++;
+ n--;
+ } else {
+ op += size;
+ ip += size;
+ n -= size;
+ }
+ } else {
+ *op++ = *ip++;
+ }
+ }
+ return (op - pwcs);
+}
+
+int
+utf8_wctomb(__u8 *s, __u16 wc, int maxlen)
+{
+ long l;
+ int c, nc;
+ struct utf8_table *t;
+
+ if (s == 0)
+ return 0;
+
+ l = wc;
+ nc = 0;
+ for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
+ nc++;
+ if (l <= t->lmask) {
+ c = t->shift;
+ *s = t->cval | (l >> c);
+ while (c > 0) {
+ c -= 6;
+ s++;
+ *s = 0x80 | ((l >> c) & 0x3F);
+ }
+ return nc;
+ }
+ }
+ return -1;
+}
+
+int
+utf8_wcstombs(__u8 *s, const __u16 *pwcs, int maxlen)
+{
+ const __u16 *ip;
+ __u8 *op;
+ int size;
+
+ op = s;
+ ip = pwcs;
+ while (*ip && maxlen > 0) {
+ if (*ip > 0x7f) {
+ size = utf8_wctomb(op, *ip, maxlen);
+ if (size == -1) {
+ /* Ignore character and move on */
+ maxlen--;
+ } else {
+ op += size;
+ maxlen -= size;
+ }
+ } else {
+ *op++ = (__u8) *ip;
+ }
+ ip++;
+ }
+ return (op - s);
+}
+
+int register_nls(struct nls_table * nls)
+{
+ struct nls_table ** tmp = &tables;
+
+ if (!nls)
+ return -EINVAL;
+ if (nls->next)
+ return -EBUSY;
+ while (*tmp) {
+ if (nls == *tmp) {
+ return -EBUSY;
+ }
+ tmp = &(*tmp)->next;
+ }
+ nls->next = tables;
+ tables = nls;
+ return 0;
+}
+
+int unregister_nls(struct nls_table * nls)
+{
+ struct nls_table ** tmp = &tables;
+
+ while (*tmp) {
+ if (nls == *tmp) {
+ *tmp = nls->next;
+ return 0;
+ }
+ tmp = &(*tmp)->next;
+ }
+ return -EINVAL;
+}
+
+struct nls_table *find_nls(char *charset)
+{
+ struct nls_table *nls = tables;
+ while (nls) {
+ if (! strcmp(nls->charset, charset))
+ return nls;
+ nls = nls->next;
+ }
+ return NULL;
+}
+
+struct nls_table *load_nls(char *charset)
+{
+ struct nls_table *nls;
+ char buf[40];
+ int ret;
+
+ nls = find_nls(charset);
+ if (nls) {
+ nls->inc_use_count();
+ return nls;
+ }
+
+#ifndef CONFIG_KERNELD
+ return NULL;
+#else
+ if (strlen(charset) > sizeof(buf) - sizeof("nls_")) {
+ printk("Unable to load NLS charset %s: name too long\n", charset);
+ return NULL;
+ }
+
+ sprintf(buf, "nls_%s", charset);
+ ret = request_module(buf);
+ if (ret != 0) {
+ printk("Unable to load NLS charset %s\n", charset);
+ return NULL;
+ }
+ nls = find_nls(charset);
+ if (nls) {
+ nls->inc_use_count();
+ }
+ return nls;
+#endif
+}
+
+void unload_nls(struct nls_table *nls)
+{
+ nls->dec_use_count();
+}
+
+struct nls_unicode charset2uni[256] = {
+ /* 0x00*/
+ {0x00, 0x00}, {0x01, 0x00}, {0x02, 0x00}, {0x03, 0x00},
+ {0x04, 0x00}, {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x00},
+ {0x08, 0x00}, {0x09, 0x00}, {0x0a, 0x00}, {0x0b, 0x00},
+ {0x0c, 0x00}, {0x0d, 0x00}, {0x0e, 0x00}, {0x0f, 0x00},
+ /* 0x10*/
+ {0x10, 0x00}, {0x11, 0x00}, {0x12, 0x00}, {0x13, 0x00},
+ {0x14, 0x00}, {0x15, 0x00}, {0x16, 0x00}, {0x17, 0x00},
+ {0x18, 0x00}, {0x19, 0x00}, {0x1a, 0x00}, {0x1b, 0x00},
+ {0x1c, 0x00}, {0x1d, 0x00}, {0x1e, 0x00}, {0x1f, 0x00},
+ /* 0x20*/
+ {0x20, 0x00}, {0x21, 0x00}, {0x22, 0x00}, {0x23, 0x00},
+ {0x24, 0x00}, {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00},
+ {0x28, 0x00}, {0x29, 0x00}, {0x2a, 0x00}, {0x2b, 0x00},
+ {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x2f, 0x00},
+ /* 0x30*/
+ {0x30, 0x00}, {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00},
+ {0x34, 0x00}, {0x35, 0x00}, {0x36, 0x00}, {0x37, 0x00},
+ {0x38, 0x00}, {0x39, 0x00}, {0x3a, 0x00}, {0x3b, 0x00},
+ {0x3c, 0x00}, {0x3d, 0x00}, {0x3e, 0x00}, {0x3f, 0x00},
+ /* 0x40*/
+ {0x40, 0x00}, {0x41, 0x00}, {0x42, 0x00}, {0x43, 0x00},
+ {0x44, 0x00}, {0x45, 0x00}, {0x46, 0x00}, {0x47, 0x00},
+ {0x48, 0x00}, {0x49, 0x00}, {0x4a, 0x00}, {0x4b, 0x00},
+ {0x4c, 0x00}, {0x4d, 0x00}, {0x4e, 0x00}, {0x4f, 0x00},
+ /* 0x50*/
+ {0x50, 0x00}, {0x51, 0x00}, {0x52, 0x00}, {0x53, 0x00},
+ {0x54, 0x00}, {0x55, 0x00}, {0x56, 0x00}, {0x57, 0x00},
+ {0x58, 0x00}, {0x59, 0x00}, {0x5a, 0x00}, {0x5b, 0x00},
+ {0x5c, 0x00}, {0x5d, 0x00}, {0x5e, 0x00}, {0x5f, 0x00},
+ /* 0x60*/
+ {0x60, 0x00}, {0x61, 0x00}, {0x62, 0x00}, {0x63, 0x00},
+ {0x64, 0x00}, {0x65, 0x00}, {0x66, 0x00}, {0x67, 0x00},
+ {0x68, 0x00}, {0x69, 0x00}, {0x6a, 0x00}, {0x6b, 0x00},
+ {0x6c, 0x00}, {0x6d, 0x00}, {0x6e, 0x00}, {0x6f, 0x00},
+ /* 0x70*/
+ {0x70, 0x00}, {0x71, 0x00}, {0x72, 0x00}, {0x73, 0x00},
+ {0x74, 0x00}, {0x75, 0x00}, {0x76, 0x00}, {0x77, 0x00},
+ {0x78, 0x00}, {0x79, 0x00}, {0x7a, 0x00}, {0x7b, 0x00},
+ {0x7c, 0x00}, {0x7d, 0x00}, {0x7e, 0x00}, {0x7f, 0x00},
+ /* 0x80*/
+ {0x80, 0x00}, {0x81, 0x00}, {0x82, 0x00}, {0x83, 0x00},
+ {0x84, 0x00}, {0x85, 0x00}, {0x86, 0x00}, {0x87, 0x00},
+ {0x88, 0x00}, {0x89, 0x00}, {0x8a, 0x00}, {0x8b, 0x00},
+ {0x8c, 0x00}, {0x8d, 0x00}, {0x8e, 0x00}, {0x8f, 0x00},
+ /* 0x90*/
+ {0x90, 0x00}, {0x91, 0x00}, {0x92, 0x00}, {0x93, 0x00},
+ {0x94, 0x00}, {0x95, 0x00}, {0x96, 0x00}, {0x97, 0x00},
+ {0x98, 0x00}, {0x99, 0x00}, {0x9a, 0x00}, {0x9b, 0x00},
+ {0x9c, 0x00}, {0x9d, 0x00}, {0x9e, 0x00}, {0x9f, 0x00},
+ /* 0xa0*/
+ {0xa0, 0x00}, {0xa1, 0x00}, {0xa2, 0x00}, {0xa3, 0x00},
+ {0xa4, 0x00}, {0xa5, 0x00}, {0xa6, 0x00}, {0xa7, 0x00},
+ {0xa8, 0x00}, {0xa9, 0x00}, {0xaa, 0x00}, {0xab, 0x00},
+ {0xac, 0x00}, {0xad, 0x00}, {0xae, 0x00}, {0xaf, 0x00},
+ /* 0xb0*/
+ {0xb0, 0x00}, {0xb1, 0x00}, {0xb2, 0x00}, {0xb3, 0x00},
+ {0xb4, 0x00}, {0xb5, 0x00}, {0xb6, 0x00}, {0xb7, 0x00},
+ {0xb8, 0x00}, {0xb9, 0x00}, {0xba, 0x00}, {0xbb, 0x00},
+ {0xbc, 0x00}, {0xbd, 0x00}, {0xbe, 0x00}, {0xbf, 0x00},
+ /* 0xc0*/
+ {0xc0, 0x00}, {0xc1, 0x00}, {0xc2, 0x00}, {0xc3, 0x00},
+ {0xc4, 0x00}, {0xc5, 0x00}, {0xc6, 0x00}, {0xc7, 0x00},
+ {0xc8, 0x00}, {0xc9, 0x00}, {0xca, 0x00}, {0xcb, 0x00},
+ {0xcc, 0x00}, {0xcd, 0x00}, {0xce, 0x00}, {0xcf, 0x00},
+ /* 0xd0*/
+ {0xd0, 0x00}, {0xd1, 0x00}, {0xd2, 0x00}, {0xd3, 0x00},
+ {0xd4, 0x00}, {0xd5, 0x00}, {0xd6, 0x00}, {0xd7, 0x00},
+ {0xd8, 0x00}, {0xd9, 0x00}, {0xda, 0x00}, {0xdb, 0x00},
+ {0xdc, 0x00}, {0xdd, 0x00}, {0xde, 0x00}, {0xdf, 0x00},
+ /* 0xe0*/
+ {0xe0, 0x00}, {0xe1, 0x00}, {0xe2, 0x00}, {0xe3, 0x00},
+ {0xe4, 0x00}, {0xe5, 0x00}, {0xe6, 0x00}, {0xe7, 0x00},
+ {0xe8, 0x00}, {0xe9, 0x00}, {0xea, 0x00}, {0xeb, 0x00},
+ {0xec, 0x00}, {0xed, 0x00}, {0xee, 0x00}, {0xef, 0x00},
+ /* 0xf0*/
+ {0xf0, 0x00}, {0xf1, 0x00}, {0xf2, 0x00}, {0xf3, 0x00},
+ {0xf4, 0x00}, {0xf5, 0x00}, {0xf6, 0x00}, {0xf7, 0x00},
+ {0xf8, 0x00}, {0xf9, 0x00}, {0xfa, 0x00}, {0xfb, 0x00},
+ {0xfc, 0x00}, {0xfd, 0x00}, {0xfe, 0x00}, {0xff, 0x00},
+};
+
+static unsigned char page00[256] = {
+ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
+ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
+ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
+ 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
+ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
+ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
+ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
+ 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
+ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
+ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
+ 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
+ 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
+ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
+ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
+ 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
+
+ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
+ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
+ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
+ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
+ 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
+ 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
+ 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
+ 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
+ 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
+ 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
+ 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
+ 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
+ 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
+ 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
+ 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
+ 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
+};
+
+static unsigned char *page_uni2charset[256] = {
+ page00
+};
+
+
+void inc_use_count(void)
+{
+}
+
+void dec_use_count(void)
+{
+}
+
+static struct nls_table default_table = {
+ "default",
+ page_uni2charset,
+ charset2uni,
+ inc_use_count,
+ dec_use_count,
+ NULL
+};
+
+
+
+/* Returns a simple default translation table */
+struct nls_table *load_nls_default(void)
+{
+ return &default_table;
+}
+
+EXPORT_SYMBOL(register_nls);
+EXPORT_SYMBOL(unregister_nls);
+EXPORT_SYMBOL(unload_nls);
+EXPORT_SYMBOL(find_nls);
+EXPORT_SYMBOL(load_nls);
+EXPORT_SYMBOL(load_nls_default);
+EXPORT_SYMBOL(utf8_mbtowc);
+EXPORT_SYMBOL(utf8_mbstowcs);
+EXPORT_SYMBOL(utf8_wctomb);
+EXPORT_SYMBOL(utf8_wcstombs);
+
+int init_nls(void)
+{
+#ifdef CONFIG_NLS_ISO8859_1
+ init_nls_iso8859_1();
+#endif
+#ifdef CONFIG_NLS_ISO8859_2
+ init_nls_iso8859_2();
+#endif
+#ifdef CONFIG_NLS_ISO8859_3
+ init_nls_iso8859_3();
+#endif
+#ifdef CONFIG_NLS_ISO8859_4
+ init_nls_iso8859_4();
+#endif
+#ifdef CONFIG_NLS_ISO8859_5
+ init_nls_iso8859_5();
+#endif
+#ifdef CONFIG_NLS_ISO8859_6
+ init_nls_iso8859_6();
+#endif
+#ifdef CONFIG_NLS_ISO8859_7
+ init_nls_iso8859_7();
+#endif
+#ifdef CONFIG_NLS_ISO8859_8
+ init_nls_iso8859_8();
+#endif
+#ifdef CONFIG_NLS_ISO8859_9
+ init_nls_iso8859_9();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_437
+ init_nls_cp437();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_737
+ init_nls_cp737();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_775
+ init_nls_cp775();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_850
+ init_nls_cp850();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_852
+ init_nls_cp852();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_855
+ init_nls_cp855();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_857
+ init_nls_cp857();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_860
+ init_nls_cp860();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_861
+ init_nls_cp861();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_862
+ init_nls_cp862();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_863
+ init_nls_cp863();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_864
+ init_nls_cp864();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_865
+ init_nls_cp865();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_866
+ init_nls_cp866();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_869
+ init_nls_cp869();
+#endif
+#ifdef CONFIG_NLS_CODEPAGE_874
+ init_nls_cp874();
+#endif
+#ifdef CONFIG_NLS_KOI8_R
+ init_nls_koi8_r();
+#endif
+ return 0;
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+ return init_nls();
+}
+
+
+void cleanup_module(void)
+{
+}
+#endif /* ifdef MODULE */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 09:13:07 +0000