Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 384 insertions, 0 deletions

diff --git a/fs/ntfs/unistr.c b/fs/ntfs/unistr.c
new file mode 100644
index 000000000000..560b0ea255b0
--- /dev/null
+++ b/fs/ntfs/unistr.c
@@ -0,0 +1,384 @@
+/*
+ * unistr.c - NTFS Unicode string handling. Part of the Linux-NTFS project.
+ *
+ * Copyright (c) 2001-2004 Anton Altaparmakov
+ *
+ * This program/include file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program/include file is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (in the main directory of the Linux-NTFS
+ * distribution in the file COPYING); if not, write to the Free Software
+ * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "types.h"
+#include "debug.h"
+#include "ntfs.h"
+
+/*
+ * IMPORTANT
+ * =========
+ *
+ * All these routines assume that the Unicode characters are in little endian
+ * encoding inside the strings!!!
+ */
+
+/*
+ * This is used by the name collation functions to quickly determine what
+ * characters are (in)valid.
+ */
+static const u8 legal_ansi_char_array[0x40] = {
+        0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+        0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+
+        0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+        0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+
+        0x17, 0x07, 0x18, 0x17, 0x17, 0x17, 0x17, 0x17,
+        0x17, 0x17, 0x18, 0x16, 0x16, 0x17, 0x07, 0x00,
+
+        0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
+        0x17, 0x17, 0x04, 0x16, 0x18, 0x16, 0x18, 0x18,
+};
+
+/**
+ * ntfs_are_names_equal - compare two Unicode names for equality
+ * @s1:                 name to compare to @s2
+ * @s1_len:             length in Unicode characters of @s1
+ * @s2:                 name to compare to @s1
+ * @s2_len:             length in Unicode characters of @s2
+ * @ic:                 ignore case bool
+ * @upcase:             upcase table (only if @ic == IGNORE_CASE)
+ * @upcase_size:        length in Unicode characters of @upcase (if present)
+ *
+ * Compare the names @s1 and @s2 and return TRUE (1) if the names are
+ * identical, or FALSE (0) if they are not identical. If @ic is IGNORE_CASE,
+ * the @upcase table is used to performa a case insensitive comparison.
+ */
+BOOL ntfs_are_names_equal(const ntfschar *s1, size_t s1_len,
+                const ntfschar *s2, size_t s2_len, const IGNORE_CASE_BOOL ic,
+                const ntfschar *upcase, const u32 upcase_size)
+{
+        if (s1_len != s2_len)
+                return FALSE;
+        if (ic == CASE_SENSITIVE)
+                return !ntfs_ucsncmp(s1, s2, s1_len);
+        return !ntfs_ucsncasecmp(s1, s2, s1_len, upcase, upcase_size);
+}
+
+/**
+ * ntfs_collate_names - collate two Unicode names
+ * @name1:      first Unicode name to compare
+ * @name2:      second Unicode name to compare
+ * @err_val:    if @name1 contains an invalid character return this value
+ * @ic:         either CASE_SENSITIVE or IGNORE_CASE
+ * @upcase:     upcase table (ignored if @ic is CASE_SENSITIVE)
+ * @upcase_len: upcase table size (ignored if @ic is CASE_SENSITIVE)
+ *
+ * ntfs_collate_names collates two Unicode names and returns:
+ *
+ *  -1 if the first name collates before the second one,
+ *   0 if the names match,
+ *   1 if the second name collates before the first one, or
+ * @err_val if an invalid character is found in @name1 during the comparison.
+ *
+ * The following characters are considered invalid: '"', '*', '<', '>' and '?'.
+ */
+int ntfs_collate_names(const ntfschar *name1, const u32 name1_len,
+                const ntfschar *name2, const u32 name2_len,
+                const int err_val, const IGNORE_CASE_BOOL ic,
+                const ntfschar *upcase, const u32 upcase_len)
+{
+        u32 cnt, min_len;
+        u16 c1, c2;
+
+        min_len = name1_len;
+        if (name1_len > name2_len)
+                min_len = name2_len;
+        for (cnt = 0; cnt < min_len; ++cnt) {
+                c1 = le16_to_cpu(*name1++);
+                c2 = le16_to_cpu(*name2++);
+                if (ic) {
+                        if (c1 < upcase_len)
+                                c1 = le16_to_cpu(upcase[c1]);
+                        if (c2 < upcase_len)
+                                c2 = le16_to_cpu(upcase[c2]);
+                }
+                if (c1 < 64 && legal_ansi_char_array[c1] & 8)
+                        return err_val;
+                if (c1 < c2)
+                        return -1;
+                if (c1 > c2)
+                        return 1;
+        }
+        if (name1_len < name2_len)
+                return -1;
+        if (name1_len == name2_len)
+                return 0;
+        /* name1_len > name2_len */
+        c1 = le16_to_cpu(*name1);
+        if (c1 < 64 && legal_ansi_char_array[c1] & 8)
+                return err_val;
+        return 1;
+}
+
+/**
+ * ntfs_ucsncmp - compare two little endian Unicode strings
+ * @s1:         first string
+ * @s2:         second string
+ * @n:          maximum unicode characters to compare
+ *
+ * Compare the first @n characters of the Unicode strings @s1 and @s2,
+ * The strings in little endian format and appropriate le16_to_cpu()
+ * conversion is performed on non-little endian machines.
+ *
+ * The function returns an integer less than, equal to, or greater than zero
+ * if @s1 (or the first @n Unicode characters thereof) is found, respectively,
+ * to be less than, to match, or be greater than @s2.
+ */
+int ntfs_ucsncmp(const ntfschar *s1, const ntfschar *s2, size_t n)
+{
+        u16 c1, c2;
+        size_t i;
+
+        for (i = 0; i < n; ++i) {
+                c1 = le16_to_cpu(s1[i]);
+                c2 = le16_to_cpu(s2[i]);
+                if (c1 < c2)
+                        return -1;
+                if (c1 > c2)
+                        return 1;
+                if (!c1)
+                        break;
+        }
+        return 0;
+}
+
+/**
+ * ntfs_ucsncasecmp - compare two little endian Unicode strings, ignoring case
+ * @s1:                 first string
+ * @s2:                 second string
+ * @n:                  maximum unicode characters to compare
+ * @upcase:             upcase table
+ * @upcase_size:        upcase table size in Unicode characters
+ *
+ * Compare the first @n characters of the Unicode strings @s1 and @s2,
+ * ignoring case. The strings in little endian format and appropriate
+ * le16_to_cpu() conversion is performed on non-little endian machines.
+ *
+ * Each character is uppercased using the @upcase table before the comparison.
+ *
+ * The function returns an integer less than, equal to, or greater than zero
+ * if @s1 (or the first @n Unicode characters thereof) is found, respectively,
+ * to be less than, to match, or be greater than @s2.
+ */
+int ntfs_ucsncasecmp(const ntfschar *s1, const ntfschar *s2, size_t n,
+                const ntfschar *upcase, const u32 upcase_size)
+{
+        size_t i;
+        u16 c1, c2;
+
+        for (i = 0; i < n; ++i) {
+                if ((c1 = le16_to_cpu(s1[i])) < upcase_size)
+                        c1 = le16_to_cpu(upcase[c1]);
+                if ((c2 = le16_to_cpu(s2[i])) < upcase_size)
+                        c2 = le16_to_cpu(upcase[c2]);
+                if (c1 < c2)
+                        return -1;
+                if (c1 > c2)
+                        return 1;
+                if (!c1)
+                        break;
+        }
+        return 0;
+}
+
+void ntfs_upcase_name(ntfschar *name, u32 name_len, const ntfschar *upcase,
+                const u32 upcase_len)
+{
+        u32 i;
+        u16 u;
+
+        for (i = 0; i < name_len; i++)
+                if ((u = le16_to_cpu(name[i])) < upcase_len)
+                        name[i] = upcase[u];
+}
+
+void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
+                const ntfschar *upcase, const u32 upcase_len)
+{
+        ntfs_upcase_name((ntfschar*)&file_name_attr->file_name,
+                        file_name_attr->file_name_length, upcase, upcase_len);
+}
+
+int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
+                FILE_NAME_ATTR *file_name_attr2,
+                const int err_val, const IGNORE_CASE_BOOL ic,
+                const ntfschar *upcase, const u32 upcase_len)
+{
+        return ntfs_collate_names((ntfschar*)&file_name_attr1->file_name,
+                        file_name_attr1->file_name_length,
+                        (ntfschar*)&file_name_attr2->file_name,
+                        file_name_attr2->file_name_length,
+                        err_val, ic, upcase, upcase_len);
+}
+
+/**
+ * ntfs_nlstoucs - convert NLS string to little endian Unicode string
+ * @vol:        ntfs volume which we are working with
+ * @ins:        input NLS string buffer
+ * @ins_len:    length of input string in bytes
+ * @outs:       on return contains the allocated output Unicode string buffer
+ *
+ * Convert the input string @ins, which is in whatever format the loaded NLS
+ * map dictates, into a little endian, 2-byte Unicode string.
+ *
+ * This function allocates the string and the caller is responsible for
+ * calling kmem_cache_free(ntfs_name_cache, @outs); when finished with it.
+ *
+ * On success the function returns the number of Unicode characters written to
+ * the output string *@outs (>= 0), not counting the terminating Unicode NULL
+ * character. *@outs is set to the allocated output string buffer.
+ *
+ * On error, a negative number corresponding to the error code is returned. In
+ * that case the output string is not allocated. Both *@outs and *@outs_len
+ * are then undefined.
+ *
+ * This might look a bit odd due to fast path optimization...
+ */
+int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
+                const int ins_len, ntfschar **outs)
+{
+        struct nls_table *nls = vol->nls_map;
+        ntfschar *ucs;
+        wchar_t wc;
+        int i, o, wc_len;
+
+        /* We don't trust outside sources. */
+        if (ins) {
+                ucs = (ntfschar*)kmem_cache_alloc(ntfs_name_cache, SLAB_NOFS);
+                if (ucs) {
+                        for (i = o = 0; i < ins_len; i += wc_len) {
+                                wc_len = nls->char2uni(ins + i, ins_len - i,
+                                                &wc);
+                                if (wc_len >= 0) {
+                                        if (wc) {
+                                                ucs[o++] = cpu_to_le16(wc);
+                                                continue;
+                                        } /* else (!wc) */
+                                        break;
+                                } /* else (wc_len < 0) */
+                                goto conversion_err;
+                        }
+                        ucs[o] = 0;
+                        *outs = ucs;
+                        return o;
+                } /* else (!ucs) */
+                ntfs_error(vol->sb, "Failed to allocate name from "
+                                "ntfs_name_cache!");
+                return -ENOMEM;
+        } /* else (!ins) */
+        ntfs_error(NULL, "Received NULL pointer.");
+        return -EINVAL;
+conversion_err:
+        ntfs_error(vol->sb, "Name using character set %s contains characters "
+                        "that cannot be converted to Unicode.", nls->charset);
+        kmem_cache_free(ntfs_name_cache, ucs);
+        return -EILSEQ;
+}
+
+/**
+ * ntfs_ucstonls - convert little endian Unicode string to NLS string
+ * @vol:        ntfs volume which we are working with
+ * @ins:        input Unicode string buffer
+ * @ins_len:    length of input string in Unicode characters
+ * @outs:       on return contains the (allocated) output NLS string buffer
+ * @outs_len:   length of output string buffer in bytes
+ *
+ * Convert the input little endian, 2-byte Unicode string @ins, of length
+ * @ins_len into the string format dictated by the loaded NLS.
+ *
+ * If *@outs is NULL, this function allocates the string and the caller is
+ * responsible for calling kfree(*@outs); when finished with it. In this case
+ * @outs_len is ignored and can be 0.
+ *
+ * On success the function returns the number of bytes written to the output
+ * string *@outs (>= 0), not counting the terminating NULL byte. If the output
+ * string buffer was allocated, *@outs is set to it.
+ *
+ * On error, a negative number corresponding to the error code is returned. In
+ * that case the output string is not allocated. The contents of *@outs are
+ * then undefined.
+ *
+ * This might look a bit odd due to fast path optimization...
+ */
+int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
+                const int ins_len, unsigned char **outs, int outs_len)
+{
+        struct nls_table *nls = vol->nls_map;
+        unsigned char *ns;
+        int i, o, ns_len, wc;
+
+        /* We don't trust outside sources. */
+        if (ins) {
+                ns = *outs;
+                ns_len = outs_len;
+                if (ns && !ns_len) {
+                        wc = -ENAMETOOLONG;
+                        goto conversion_err;
+                }
+                if (!ns) {
+                        ns_len = ins_len * NLS_MAX_CHARSET_SIZE;
+                        ns = (unsigned char*)kmalloc(ns_len + 1, GFP_NOFS);
+                        if (!ns)
+                                goto mem_err_out;
+                }
+                for (i = o = 0; i < ins_len; i++) {
+retry:                  wc = nls->uni2char(le16_to_cpu(ins[i]), ns + o,
+                                        ns_len - o);
+                        if (wc > 0) {
+                                o += wc;
+                                continue;
+                        } else if (!wc)
+                                break;
+                        else if (wc == -ENAMETOOLONG && ns != *outs) {
+                                unsigned char *tc;
+                                /* Grow in multiples of 64 bytes. */
+                                tc = (unsigned char*)kmalloc((ns_len + 64) &
+                                                ~63, GFP_NOFS);
+                                if (tc) {
+                                        memcpy(tc, ns, ns_len);
+                                        ns_len = ((ns_len + 64) & ~63) - 1;
+                                        kfree(ns);
+                                        ns = tc;
+                                        goto retry;
+                                } /* No memory so goto conversion_error; */
+                        } /* wc < 0, real error. */
+                        goto conversion_err;
+                }
+                ns[o] = 0;
+                *outs = ns;
+                return o;
+        } /* else (!ins) */
+        ntfs_error(vol->sb, "Received NULL pointer.");
+        return -EINVAL;
+conversion_err:
+        ntfs_error(vol->sb, "Unicode name contains characters that cannot be "
+                        "converted to character set %s.", nls->charset);
+        if (ns != *outs)
+                kfree(ns);
+        if (wc != -ENAMETOOLONG)
+                wc = -EILSEQ;
+        return wc;
+mem_err_out:
+        ntfs_error(vol->sb, "Failed to allocate name!");
+        return -ENOMEM;
+}