+/*
+ * symlink.c
+ *
+ * Code to read and set symbolic links in WIM files.
+ */
+
+/*
+ * Copyright (C) 2012 Eric Biggers
+ *
+ * This file is part of wimlib, a library for working with WIM files.
+ *
+ * wimlib 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 3 of the License, or (at your option)
+ * any later version.
+ *
+ * wimlib 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 wimlib; if not, see http://www.gnu.org/licenses/.
+ */
+
#include "dentry.h"
#include "io.h"
#include "lookup_table.h"
}
if (header_size + substitute_name_offset + substitute_name_len > resource_len)
return -EIO;
- link_target = utf16_to_utf8(p + substitute_name_offset,
+ link_target = utf16_to_utf8((const char *)p + substitute_name_offset,
substitute_name_len,
&link_target_len);
translated_target += 4;
link_target_len -= 4;
/* There's a drive letter, so just leave the backslashes since
- * it won't go anyhwere on UNIX anyway... */
+ * it won't go anyhwere on UNIX anyway...
+ *
+ * XXX
+ * NTFS-3g tries to re-map these links to actually point to
+ * something, so maybe we could do something like that here
+ * XXX*/
} else {
for (size_t i = 0; i < link_target_len; i++)
if (translated_target[i] == '\\')
return NULL;
/*DEBUG("utf16_len = %zu", utf16_len);*/
for (size_t i = 0; i < utf16_len / 2; i++)
- if (((u16*)name_utf16)[i] == to_le16('/'))
- ((u16*)name_utf16)[i] = to_le16('\\');
- size_t len = 12 + utf16_len * 2;
+ if (((u16*)name_utf16)[i] == cpu_to_le16('/'))
+ ((u16*)name_utf16)[i] = cpu_to_le16('\\');
+ size_t len = 12 + utf16_len * 2 + 4;
void *buf = MALLOC(len);
if (!buf)
goto out;
/* XXX Fix absolute paths */
u8 *p = buf;
- p = put_u16(p, 0); /* Substitute name offset */
+ p = put_u16(p, utf16_len + 2); /* Substitute name offset */
p = put_u16(p, utf16_len); /* Substitute name length */
- p = put_u16(p, utf16_len); /* Print name offset */
+ p = put_u16(p, 0); /* Print name offset */
p = put_u16(p, utf16_len); /* Print name length */
p = put_u32(p, 1);
- p = put_bytes(p, utf16_len, name_utf16);
- p = put_bytes(p, utf16_len, name_utf16);
+ p = put_bytes(p, utf16_len, (const u8*)name_utf16);
+ p = put_u16(p, 0);
+ p = put_bytes(p, utf16_len, (const u8*)name_utf16);
+ p = put_u16(p, 0);
/*DEBUG("utf16_len = %zu, len = %zu", utf16_len, len);*/
*len_ret = len;
out:
return buf;
}
-static const struct lookup_table_entry *
-dentry_first_lte(const struct dentry *dentry, const struct lookup_table *table)
-{
- const struct lookup_table_entry *lte;
- if (dentry->resolved) {
- if (dentry->lte)
- return dentry->lte;
- for (u16 i = 0; i < dentry->num_ads; i++)
- if (dentry->ads_entries[i].lte)
- return dentry->ads_entries[i].lte;
- } else {
- const u8 *hash = dentry->hash;
- u16 i = 0;
- while (1) {
- if ((lte = __lookup_resource(table, hash)))
- break;
- if (i == dentry->num_ads)
- return NULL;
- hash = dentry->ads_entries[i].hash;
- i++;
- }
- }
- return NULL;
-}
-
-/* Get the symlink target from a dentry that's already checked to be either a
- * "real" symlink or a junction point. */
-ssize_t dentry_readlink(const struct dentry *dentry, char *buf, size_t buf_len,
- const WIMStruct *w)
+/* Get the symlink target from a dentry.
+ *
+ * The dentry may be either "real" symlink or a junction point.
+ */
+ssize_t inode_readlink(const struct inode *inode, char *buf, size_t buf_len,
+ const WIMStruct *w, int read_resource_flags)
{
- const struct resource_entry *res_entry;
const struct lookup_table_entry *lte;
+ int ret;
- wimlib_assert(dentry_is_symlink(dentry));
+ wimlib_assert(inode_is_symlink(inode));
- lte = dentry_first_lte(dentry, w->lookup_table);
+ lte = inode_unnamed_lte(inode, w->lookup_table);
if (!lte)
return -EIO;
- res_entry = <e->resource_entry;
- if (res_entry->original_size > 10000)
+ if (wim_resource_size(lte) > 10000)
return -EIO;
- char __res_buf[res_entry->original_size];
- const char *res_buf;
- if (lte->is_symlink && lte->symlink_buf) {
- res_buf = lte->symlink_buf;
- } else {
- res_buf = __res_buf;
- if (read_full_resource(w->fp, res_entry->size,
- res_entry->original_size,
- res_entry->offset,
- wim_resource_compression_type(w, res_entry),
- __res_buf) != 0)
- return -EIO;
- res_buf = __res_buf;
- }
- return get_symlink_name(res_buf, res_entry->original_size, buf,
- buf_len, dentry->reparse_tag);
-}
-
-static int dentry_set_symlink_buf(struct dentry *dentry,
- const u8 symlink_buf_hash[])
-{
- struct ads_entry *ads_entries;
-
- ads_entries = CALLOC(2, sizeof(struct ads_entry));
- if (!ads_entries)
- return WIMLIB_ERR_NOMEM;
- memcpy(ads_entries[1].hash, symlink_buf_hash, WIM_HASH_SIZE);
- dentry_free_ads_entries(dentry);
- dentry->num_ads = 2;
- dentry->ads_entries = ads_entries;
- return 0;
+ u8 res_buf[wim_resource_size(lte)];
+ ret = read_full_wim_resource(lte, res_buf, read_resource_flags);
+ if (ret != 0)
+ return -EIO;
+ return get_symlink_name(res_buf, wim_resource_size(lte), buf,
+ buf_len, inode->reparse_tag);
}
-int dentry_set_symlink(struct dentry *dentry, const char *target,
- struct lookup_table *lookup_table,
- struct lookup_table_entry **lte_ret)
+/*
+ * Sets @inode to be a symbolic link pointing to @target.
+ *
+ * A lookup table entry for the symbolic link data buffer is created and
+ * inserted into @lookup_table, unless there is an existing lookup table entry
+ * for the exact same data, in which its reference count is incremented.
+ *
+ * The lookup table entry is returned in @lte_ret.
+ *
+ * On failure @dentry and @lookup_table are not modified.
+ */
+int inode_set_symlink(struct inode *inode, const char *target,
+ struct lookup_table *lookup_table,
+ struct lookup_table_entry **lte_ret)
{
int ret;
size_t symlink_buf_len;
struct lookup_table_entry *lte = NULL, *existing_lte;
- u8 symlink_buf_hash[WIM_HASH_SIZE];
+ u8 symlink_buf_hash[SHA1_HASH_SIZE];
void *symlink_buf;
-
+
symlink_buf = make_symlink_reparse_data_buf(target, &symlink_buf_len);
if (!symlink_buf)
return WIMLIB_ERR_NOMEM;
DEBUG("Made symlink reparse data buf (len = %zu, name len = %zu)",
- symlink_buf_len, ret);
-
+ symlink_buf_len, symlink_buf_len);
+
sha1_buffer(symlink_buf, symlink_buf_len, symlink_buf_hash);
existing_lte = __lookup_resource(lookup_table, symlink_buf_hash);
if (existing_lte) {
- existing_lte->refcnt++;
+ lte = existing_lte;
+ FREE(symlink_buf);
+ symlink_buf = NULL;
} else {
DEBUG("Creating new lookup table entry for symlink buf");
lte = new_lookup_table_entry();
ret = WIMLIB_ERR_NOMEM;
goto out_free_symlink_buf;
}
- lte->is_symlink = true;
- lte->symlink_buf = symlink_buf;
+ lte->resource_location = RESOURCE_IN_ATTACHED_BUFFER;
+ lte->attached_buffer = symlink_buf;
lte->resource_entry.original_size = symlink_buf_len;
- lte->resource_entry.size = symlink_buf_len;
- memcpy(lte->hash, symlink_buf_hash, WIM_HASH_SIZE);
+ lte->resource_entry.size = symlink_buf_len;
+ copy_hash(lte->hash, symlink_buf_hash);
}
- ret = dentry_set_symlink_buf(dentry, symlink_buf_hash);
-
- if (ret != 0)
- goto out_free_lte;
+ inode->lte = lte;
+ inode->resolved = true;
DEBUG("Loaded symlink buf");
- if (!existing_lte)
+ if (existing_lte)
+ lte->refcnt++;
+ else
lookup_table_insert(lookup_table, lte);
if (lte_ret)
*lte_ret = lte;
return 0;
-out_free_lte:
- FREE(lte);
out_free_symlink_buf:
FREE(symlink_buf);
return ret;
git://wimlib.net / wimlib / blobdiff