/* * 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 * * 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/crc-itu-t.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; BUG_ON(size < 2); usesize = min_t(size_t, ptr[size - 1], sizeof(dest->u_name)); usesize = min(usesize, size - 2); dest->u_cmpID = ptr[0]; dest->u_len = usesize; memcpy(dest->u_name, ptr + 1, usesize); memset(dest->u_name + usesize, 0, sizeof(dest->u_name) - usesize); 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. * * 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, const struct ustr *ocu_i) { const uint8_t *ocu; uint8_t cmp_id, ocu_len; int i; ocu_len = ocu_i->u_len; if (ocu_len == 0) { memset(utf_o, 0, sizeof(struct ustr)); return 0; } cmp_id = ocu_i->u_cmpID; if (cmp_id != 8 && cmp_id != 16) { memset(utf_o, 0, sizeof(struct ustr)); printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n", cmp_id, ocu_i->u_name); return 0; } ocu = ocu_i->u_name; utf_o->u_len = 0; for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) { /* Expand OSTA compressed Unicode to Unicode */ uint32_t 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 (max_val == 0xffU) { 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, const struct ustr *ocu_i) { const uint8_t *ocu; uint8_t cmp_id, ocu_len; int i, len; ocu_len = ocu_i->u_len; if (ocu_len == 0) { memset(utf_o, 0, sizeof(struct ustr)); return 0; } cmp_id = ocu_i->u_cmpID; if (cmp_id != 8 && cmp_id != 16) { memset(utf_o, 0, sizeof(struct ustr)); printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n", cmp_id, ocu_i->u_name); return 0; } ocu = ocu_i->u_name; utf_o->u_len = 0; for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) { /* Expand OSTA compressed Unicode to Unicode */ uint32_t c = ocu[i++]; if (cmp_id == 16) c = (c << 8) | ocu[i++]; len = nls->uni2char(c, &utf_o->u_name[utf_o->u_len], UDF_NAME_LEN - utf_o->u_len); /* Valid character? */ if (len >= 0) utf_o->u_len += len; else utf_o->u_name[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) { int len; unsigned 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) continue; /* Invalid character, deal with it */ if (len < 0) { len = 1; uni_char = '?'; } 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 = 0; filename = kmalloc(sizeof(struct ustr), GFP_NOFS); if (!filename) return 0; unifilename = kmalloc(sizeof(struct ustr), GFP_NOFS); if (!unifilename) goto out1; if (udf_build_ustr_exact(unifilename, sname, flen)) goto out2; if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) { if (!udf_CS0toUTF8(filename, unifilename)) { udf_debug("Failed in udf_get_filename: sname = %s\n", sname); goto out2; } } 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); goto out2; } } else goto out2; len = udf_translate_to_linux(dname, filename->u_name, filename->u_len, unifilename->u_name, unifilename->u_len); out2: kfree(unifilename); out1: kfree(filename); return len; } 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)) { namelen = udf_UTF8toCS0(dname, &unifilename, UDF_NAME_LEN); if (!namelen) return 0; } else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) { namelen = udf_NLStoCS0(UDF_SB(sb)->s_nls_map, dname, &unifilename, UDF_NAME_LEN); if (!namelen) 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 = crc_itu_t(0, fidName, fidNameLen); 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; }