1 files changed, 516 insertions, 0 deletions

diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c
new file mode 100644
index 000000000000..5a80efd8debc
--- /dev/null
+++ b/fs/udf/unicode.c
@@ -0,0 +1,516 @@
+/*
+ * unicode.c
+ *
+ * PURPOSE
+ *      Routines for converting between UTF-8 and OSTA Compressed Unicode.
+ *      Also handles filename mangling
+ *
+ * DESCRIPTION
+ *      OSTA Compressed Unicode is explained in the OSTA UDF specification.
+ *              http://www.osta.org/
+ *      UTF-8 is explained in the IETF RFC XXXX.
+ *              ftp://ftp.internic.net/rfc/rfcxxxx.txt
+ *
+ * CONTACTS
+ *      E-mail regarding any portion of the Linux UDF file system should be
+ *      directed to the development team's mailing list (run by majordomo):
+ *              linux_udf@hpesjro.fc.hp.com
+ *
+ * COPYRIGHT
+ *      This file is distributed under the terms of the GNU General Public
+ *      License (GPL). Copies of the GPL can be obtained from:
+ *              ftp://prep.ai.mit.edu/pub/gnu/GPL
+ *      Each contributing author retains all rights to their own work.
+ */
+
+#include "udfdecl.h"
+
+#include <linux/kernel.h>
+#include <linux/string.h>       /* for memset */
+#include <linux/nls.h>
+#include <linux/udf_fs.h>
+
+#include "udf_sb.h"
+
+static int udf_translate_to_linux(uint8_t *, uint8_t *, int, uint8_t *, int);
+
+static int udf_char_to_ustr(struct ustr *dest, const uint8_t *src, int strlen)
+{
+        if ( (!dest) || (!src) || (!strlen) || (strlen > UDF_NAME_LEN-2) )
+                return 0;
+        memset(dest, 0, sizeof(struct ustr));
+        memcpy(dest->u_name, src, strlen);
+        dest->u_cmpID = 0x08;
+        dest->u_len = strlen;
+        return strlen;
+}
+
+/*
+ * udf_build_ustr
+ */
+int udf_build_ustr(struct ustr *dest, dstring *ptr, int size)
+{
+        int usesize;
+
+        if ( (!dest) || (!ptr) || (!size) )
+                return -1;
+
+        memset(dest, 0, sizeof(struct ustr));
+        usesize= (size > UDF_NAME_LEN) ? UDF_NAME_LEN : size;
+        dest->u_cmpID=ptr[0];
+        dest->u_len=ptr[size-1];
+        memcpy(dest->u_name, ptr+1, usesize-1);
+        return 0;
+}
+
+/*
+ * udf_build_ustr_exact
+ */
+static int udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
+{
+        if ( (!dest) || (!ptr) || (!exactsize) )
+                return -1;
+
+        memset(dest, 0, sizeof(struct ustr));
+        dest->u_cmpID=ptr[0];
+        dest->u_len=exactsize-1;
+        memcpy(dest->u_name, ptr+1, exactsize-1);
+        return 0;
+}
+
+/*
+ * udf_ocu_to_utf8
+ *
+ * PURPOSE
+ *      Convert OSTA Compressed Unicode to the UTF-8 equivalent.
+ *
+ * DESCRIPTION
+ *      This routine is only called by udf_filldir().
+ *
+ * PRE-CONDITIONS
+ *      utf                     Pointer to UTF-8 output buffer.
+ *      ocu                     Pointer to OSTA Compressed Unicode input buffer
+ *                              of size UDF_NAME_LEN bytes.
+ *                              both of type "struct ustr *"
+ *
+ * POST-CONDITIONS
+ *      <return>                Zero on success.
+ *
+ * HISTORY
+ *      November 12, 1997 - Andrew E. Mileski
+ *      Written, tested, and released.
+ */
+int udf_CS0toUTF8(struct ustr *utf_o, struct ustr *ocu_i)
+{
+        uint8_t *ocu;
+        uint32_t c;
+        uint8_t cmp_id, ocu_len;
+        int i;
+
+        ocu = ocu_i->u_name;
+
+        ocu_len = ocu_i->u_len;
+        cmp_id = ocu_i->u_cmpID;
+        utf_o->u_len = 0;
+
+        if (ocu_len == 0)
+        {
+                memset(utf_o, 0, sizeof(struct ustr));
+                utf_o->u_cmpID = 0;
+                utf_o->u_len = 0;
+                return 0;
+        }
+
+        if ((cmp_id != 8) && (cmp_id != 16))
+        {
+                printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n", cmp_id, ocu_i->u_name);
+                return 0;
+        }
+
+        for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN-3)) ;)
+        {
+
+                /* Expand OSTA compressed Unicode to Unicode */
+                c = ocu[i++];
+                if (cmp_id == 16)
+                        c = (c << 8) | ocu[i++];
+
+                /* Compress Unicode to UTF-8 */
+                if (c < 0x80U)
+                        utf_o->u_name[utf_o->u_len++] = (uint8_t)c;
+                else if (c < 0x800U)
+                {
+                        utf_o->u_name[utf_o->u_len++] = (uint8_t)(0xc0 | (c >> 6));
+                        utf_o->u_name[utf_o->u_len++] = (uint8_t)(0x80 | (c & 0x3f));
+                }
+                else
+                {
+                        utf_o->u_name[utf_o->u_len++] = (uint8_t)(0xe0 | (c >> 12));
+                        utf_o->u_name[utf_o->u_len++] = (uint8_t)(0x80 | ((c >> 6) & 0x3f));
+                        utf_o->u_name[utf_o->u_len++] = (uint8_t)(0x80 | (c & 0x3f));
+                }
+        }
+        utf_o->u_cmpID=8;
+
+        return utf_o->u_len;
+}
+
+/*
+ *
+ * udf_utf8_to_ocu
+ *
+ * PURPOSE
+ *      Convert UTF-8 to the OSTA Compressed Unicode equivalent.
+ *
+ * DESCRIPTION
+ *      This routine is only called by udf_lookup().
+ *
+ * PRE-CONDITIONS
+ *      ocu                     Pointer to OSTA Compressed Unicode output
+ *                              buffer of size UDF_NAME_LEN bytes.
+ *      utf                     Pointer to UTF-8 input buffer.
+ *      utf_len                 Length of UTF-8 input buffer in bytes.
+ *
+ * POST-CONDITIONS
+ *      <return>                Zero on success.
+ *
+ * HISTORY
+ *      November 12, 1997 - Andrew E. Mileski
+ *      Written, tested, and released.
+ */
+static int udf_UTF8toCS0(dstring *ocu, struct ustr *utf, int length)
+{
+        unsigned c, i, max_val, utf_char;
+        int utf_cnt, u_len;
+
+        memset(ocu, 0, sizeof(dstring) * length);
+        ocu[0] = 8;
+        max_val = 0xffU;
+
+try_again:
+        u_len = 0U;
+        utf_char = 0U;
+        utf_cnt = 0U;
+        for (i = 0U; i < utf->u_len; i++)
+        {
+                c = (uint8_t)utf->u_name[i];
+
+                /* Complete a multi-byte UTF-8 character */
+                if (utf_cnt)
+                {
+                        utf_char = (utf_char << 6) | (c & 0x3fU);
+                        if (--utf_cnt)
+                                continue;
+                }
+                else
+                {
+                        /* Check for a multi-byte UTF-8 character */
+                        if (c & 0x80U)
+                        {
+                                /* Start a multi-byte UTF-8 character */
+                                if ((c & 0xe0U) == 0xc0U)
+                                {
+                                        utf_char = c & 0x1fU;
+                                        utf_cnt = 1;
+                                }
+                                else if ((c & 0xf0U) == 0xe0U)
+                                {
+                                        utf_char = c & 0x0fU;
+                                        utf_cnt = 2;
+                                }
+                                else if ((c & 0xf8U) == 0xf0U)
+                                {
+                                        utf_char = c & 0x07U;
+                                        utf_cnt = 3;
+                                }
+                                else if ((c & 0xfcU) == 0xf8U)
+                                {
+                                        utf_char = c & 0x03U;
+                                        utf_cnt = 4;
+                                }
+                                else if ((c & 0xfeU) == 0xfcU)
+                                {
+                                        utf_char = c & 0x01U;
+                                        utf_cnt = 5;
+                                }
+                                else
+                                        goto error_out;
+                                continue;
+                        } else
+                                /* Single byte UTF-8 character (most common) */
+                                utf_char = c;
+                }
+
+                /* Choose no compression if necessary */
+                if (utf_char > max_val)
+                {
+                        if ( 0xffU == max_val )
+                        {
+                                max_val = 0xffffU;
+                                ocu[0] = (uint8_t)0x10U;
+                                goto try_again;
+                        }
+                        goto error_out;
+                }
+
+                if (max_val == 0xffffU)
+                {
+                        ocu[++u_len] = (uint8_t)(utf_char >> 8);
+                }
+                ocu[++u_len] = (uint8_t)(utf_char & 0xffU);
+        }
+
+
+        if (utf_cnt)
+        {
+error_out:
+                ocu[++u_len] = '?';
+                printk(KERN_DEBUG "udf: bad UTF-8 character\n");
+        }
+
+        ocu[length - 1] = (uint8_t)u_len + 1;
+        return u_len + 1;
+}
+
+static int udf_CS0toNLS(struct nls_table *nls, struct ustr *utf_o, struct ustr *ocu_i)
+{
+        uint8_t *ocu;
+        uint32_t c;
+        uint8_t cmp_id, ocu_len;
+        int i;
+
+        ocu = ocu_i->u_name;
+
+        ocu_len = ocu_i->u_len;
+        cmp_id = ocu_i->u_cmpID;
+        utf_o->u_len = 0;
+
+        if (ocu_len == 0)
+        {
+                memset(utf_o, 0, sizeof(struct ustr));
+                utf_o->u_cmpID = 0;
+                utf_o->u_len = 0;
+                return 0;
+        }
+
+        if ((cmp_id != 8) && (cmp_id != 16))
+        {
+                printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n", cmp_id, ocu_i->u_name);
+                return 0;
+        }
+
+        for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN-3)) ;)
+        {
+                /* Expand OSTA compressed Unicode to Unicode */
+                c = ocu[i++];
+                if (cmp_id == 16)
+                        c = (c << 8) | ocu[i++];
+
+                utf_o->u_len += nls->uni2char(c, &utf_o->u_name[utf_o->u_len], 
+                        UDF_NAME_LEN - utf_o->u_len);
+        }
+        utf_o->u_cmpID=8;
+
+        return utf_o->u_len;
+}
+
+static int udf_NLStoCS0(struct nls_table *nls, dstring *ocu, struct ustr *uni, int length)
+{
+        unsigned len, i, max_val;
+        uint16_t uni_char;
+        int u_len;
+
+        memset(ocu, 0, sizeof(dstring) * length);
+        ocu[0] = 8;
+        max_val = 0xffU;
+
+try_again:
+        u_len = 0U;
+        for (i = 0U; i < uni->u_len; i++)
+        {
+                len = nls->char2uni(&uni->u_name[i], uni->u_len-i, &uni_char);
+                if (len <= 0)
+                        continue;
+
+                if (uni_char > max_val)
+                {
+                        max_val = 0xffffU;
+                        ocu[0] = (uint8_t)0x10U;
+                        goto try_again;
+                }
+                
+                if (max_val == 0xffffU)
+                        ocu[++u_len] = (uint8_t)(uni_char >> 8);
+                ocu[++u_len] = (uint8_t)(uni_char & 0xffU);
+                i += len - 1;
+        }
+
+        ocu[length - 1] = (uint8_t)u_len + 1;
+        return u_len + 1;
+}
+
+int udf_get_filename(struct super_block *sb, uint8_t *sname, uint8_t *dname, int flen)
+{
+        struct ustr filename, unifilename;
+        int len;
+
+        if (udf_build_ustr_exact(&unifilename, sname, flen))
+        {
+                return 0;
+        }
+
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
+        {
+                if (!udf_CS0toUTF8(&filename, &unifilename) )
+                {
+                        udf_debug("Failed in udf_get_filename: sname = %s\n", sname);
+                        return 0;
+                }
+        }
+        else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
+        {
+                if (!udf_CS0toNLS(UDF_SB(sb)->s_nls_map, &filename, &unifilename) )
+                {
+                        udf_debug("Failed in udf_get_filename: sname = %s\n", sname);
+                        return 0;
+                }
+        }
+        else
+                return 0;
+
+        if ((len = udf_translate_to_linux(dname, filename.u_name, filename.u_len,
+                unifilename.u_name, unifilename.u_len)))
+        {
+                return len;
+        }
+        return 0;
+}
+
+int udf_put_filename(struct super_block *sb, const uint8_t *sname, uint8_t *dname, int flen)
+{
+        struct ustr unifilename;
+        int namelen;
+
+        if ( !(udf_char_to_ustr(&unifilename, sname, flen)) )
+        {
+                return 0;
+        }
+
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
+        {
+                if ( !(namelen = udf_UTF8toCS0(dname, &unifilename, UDF_NAME_LEN)) )
+                {
+                        return 0;
+                }
+        }
+        else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
+        {
+                if ( !(namelen = udf_NLStoCS0(UDF_SB(sb)->s_nls_map, dname, &unifilename, UDF_NAME_LEN)) )
+                {
+                        return 0;
+                }
+        }
+        else
+                return 0;
+
+        return namelen;
+}
+
+#define ILLEGAL_CHAR_MARK       '_'
+#define EXT_MARK                        '.'
+#define CRC_MARK                        '#'
+#define EXT_SIZE                        5
+
+static int udf_translate_to_linux(uint8_t *newName, uint8_t *udfName, int udfLen, uint8_t *fidName, int fidNameLen)
+{
+        int index, newIndex = 0, needsCRC = 0;  
+        int extIndex = 0, newExtIndex = 0, hasExt = 0;
+        unsigned short valueCRC;
+        uint8_t curr;
+        const uint8_t hexChar[] = "0123456789ABCDEF";
+
+        if (udfName[0] == '.' && (udfLen == 1 ||
+                (udfLen == 2 && udfName[1] == '.')))
+        {
+                needsCRC = 1;
+                newIndex = udfLen;
+                memcpy(newName, udfName, udfLen);
+        }
+        else
+        {       
+                for (index = 0; index < udfLen; index++)
+                {
+                        curr = udfName[index];
+                        if (curr == '/' || curr == 0)
+                        {
+                                needsCRC = 1;
+                                curr = ILLEGAL_CHAR_MARK;
+                                while (index+1 < udfLen && (udfName[index+1] == '/' ||
+                                        udfName[index+1] == 0))
+                                        index++;
+                        }
+                        if (curr == EXT_MARK && (udfLen - index - 1) <= EXT_SIZE)
+                        {
+                                if (udfLen == index + 1)
+                                        hasExt = 0;
+                                else
+                                {
+                                        hasExt = 1;
+                                        extIndex = index;
+                                        newExtIndex = newIndex;
+                                }
+                        }
+                        if (newIndex < 256)
+                                newName[newIndex++] = curr;
+                        else
+                                needsCRC = 1;
+                }
+        }
+        if (needsCRC)
+        {
+                uint8_t ext[EXT_SIZE];
+                int localExtIndex = 0;
+
+                if (hasExt)
+                {
+                        int maxFilenameLen;
+                        for(index = 0; index<EXT_SIZE && extIndex + index +1 < udfLen;
+                                index++ )
+                        {
+                                curr = udfName[extIndex + index + 1];
+
+                                if (curr == '/' || curr == 0)
+                                {
+                                        needsCRC = 1;
+                                        curr = ILLEGAL_CHAR_MARK;
+                                        while(extIndex + index + 2 < udfLen && (index + 1 < EXT_SIZE
+                                                && (udfName[extIndex + index + 2] == '/' ||
+                                                        udfName[extIndex + index + 2] == 0)))
+                                                index++;
+                                }
+                                ext[localExtIndex++] = curr;
+                        }
+                        maxFilenameLen = 250 - localExtIndex;
+                        if (newIndex > maxFilenameLen)
+                                newIndex = maxFilenameLen;
+                        else
+                                newIndex = newExtIndex;
+                }
+                else if (newIndex > 250)
+                        newIndex = 250;
+                newName[newIndex++] = CRC_MARK;
+                valueCRC = udf_crc(fidName, fidNameLen, 0);
+                newName[newIndex++] = hexChar[(valueCRC & 0xf000) >> 12];
+                newName[newIndex++] = hexChar[(valueCRC & 0x0f00) >> 8];
+                newName[newIndex++] = hexChar[(valueCRC & 0x00f0) >> 4];
+                newName[newIndex++] = hexChar[(valueCRC & 0x000f)];
+
+                if (hasExt)
+                {
+                        newName[newIndex++] = EXT_MARK;
+                        for (index = 0;index < localExtIndex ;index++ )
+                                newName[newIndex++] = ext[index];
+                }
+        }
+        return newIndex;
+}