return (ntfschar*)((u8*)ar + le16_to_cpu(ar->name_offset));
}
-/* Calculates the SHA1 message digest of a NTFS attribute.
- *
- * @ni: The NTFS inode containing the attribute.
- * @ar: The ATTR_RECORD describing the attribute.
- * @md: If successful, the returned SHA1 message digest.
- * @reparse_tag_ret: Optional pointer into which the first 4 bytes of the
- * attribute will be written (to get the reparse
- * point ID)
- *
- * Return 0 on success or nonzero on error.
- */
-static int
-ntfs_attr_sha1sum(ntfs_inode *ni, ATTR_RECORD *ar,
- u8 md[SHA1_HASH_SIZE],
- bool is_reparse_point,
- u32 *reparse_tag_ret)
+int
+read_ntfs_file_prefix(const struct wim_lookup_table_entry *lte,
+ u64 size,
+ consume_data_callback_t cb,
+ void *ctx_or_buf,
+ int _ignored_flags)
{
- s64 pos = 0;
- s64 bytes_remaining;
- char buf[BUFFER_SIZE];
+ struct ntfs_location *loc = lte->ntfs_loc;
+ ntfs_volume *vol = *loc->ntfs_vol_p;
+ ntfs_inode *ni;
ntfs_attr *na;
- SHA_CTX ctx;
+ s64 pos;
+ s64 bytes_remaining;
+ void *out_buf;
+ int ret;
- na = ntfs_attr_open(ni, ar->type, attr_record_name(ar),
- ar->name_length);
- if (!na) {
- ERROR_WITH_ERRNO("Failed to open NTFS attribute");
- return WIMLIB_ERR_NTFS_3G;
+ ni = ntfs_pathname_to_inode(vol, NULL, loc->path);
+ if (!ni) {
+ ERROR_WITH_ERRNO("Can't find NTFS inode for \"%"TS"\"", loc->path);
+ ret = WIMLIB_ERR_NTFS_3G;
+ goto out;
}
- bytes_remaining = na->data_size;
-
- if (is_reparse_point) {
- if (ntfs_attr_pread(na, 0, 8, buf) != 8)
- goto out_error;
- *reparse_tag_ret = le32_to_cpu(*(u32*)buf);
- DEBUG("ReparseTag = %#x", *reparse_tag_ret);
- pos = 8;
- bytes_remaining -= 8;
+ na = ntfs_attr_open(ni,
+ loc->is_reparse_point ? AT_REPARSE_POINT : AT_DATA,
+ loc->stream_name,
+ loc->stream_name_nchars);
+ if (!na) {
+ ERROR_WITH_ERRNO("Failed to open attribute of \"%"TS"\" in "
+ "NTFS volume", loc->path);
+ ret = WIMLIB_ERR_NTFS_3G;
+ goto out_close_ntfs_inode;
}
- sha1_init(&ctx);
+ /*if (is_reparse_point) {*/
+ /*if (ntfs_attr_pread(na, 0, 8, buf) != 8)*/
+ /*goto out_error;*/
+ /**reparse_tag_ret = le32_to_cpu(*(u32*)buf);*/
+ /*DEBUG("ReparseTag = %#x", *reparse_tag_ret);*/
+ /*pos = 8;*/
+ /*bytes_remaining -= 8;*/
+ /*}*/
+
+ if (cb)
+ out_buf = alloca(WIM_CHUNK_SIZE);
+ else
+ out_buf = ctx_or_buf;
+ pos = 0;
+ bytes_remaining = na->data_size;
while (bytes_remaining) {
- s64 to_read = min(bytes_remaining, sizeof(buf));
- if (ntfs_attr_pread(na, pos, to_read, buf) != to_read)
- goto out_error;
- sha1_update(&ctx, buf, to_read);
+ s64 to_read = min(bytes_remaining, WIM_CHUNK_SIZE);
+ if (ntfs_attr_pread(na, pos, to_read, out_buf) != to_read) {
+ ERROR_WITH_ERRNO("Error reading \"%"TS"\"", loc->path);
+ ret = WIMLIB_ERR_NTFS_3G;
+ goto out_close_ntfs_attr;
+ }
pos += to_read;
bytes_remaining -= to_read;
+ if (cb) {
+ ret = cb(out_buf, to_read, ctx_or_buf);
+ if (ret)
+ goto out_close_ntfs_attr;
+ } else {
+ out_buf += to_read;
+ }
}
- sha1_final(md, &ctx);
+ ret = 0;
+out_close_ntfs_attr:
ntfs_attr_close(na);
- return 0;
-out_error:
- ERROR_WITH_ERRNO("Error reading NTFS attribute");
- return WIMLIB_ERR_NTFS_3G;
+out_close_ntfs_inode:
+ ntfs_inode_close(ni);
+out:
+ return ret;
}
/* Load the streams from a file or reparse point in the NTFS volume into the WIM
ATTR_TYPES type)
{
ntfs_attr_search_ctx *actx;
- u8 attr_hash[SHA1_HASH_SIZE];
struct ntfs_location *ntfs_loc = NULL;
int ret = 0;
struct wim_lookup_table_entry *lte;
while (!ntfs_attr_lookup(type, NULL, 0,
CASE_SENSITIVE, 0, NULL, 0, actx))
{
- u32 reparse_tag;
u64 data_size = ntfs_get_attribute_value_length(actx->attr);
u64 name_length = actx->attr->name_length;
+ struct wim_lookup_table_entry **back_ptr;
if (data_size == 0) {
if (errno != 0) {
ERROR_WITH_ERRNO("Failed to get size of attribute of "
/* Empty stream. No lookup table entry is needed. */
lte = NULL;
} else {
- if (type == AT_REPARSE_POINT && data_size < 8) {
- ERROR("`%s': reparse point buffer too small",
- path);
- ret = WIMLIB_ERR_NTFS_3G;
+ ntfs_loc = CALLOC(1, sizeof(*ntfs_loc));
+ if (!ntfs_loc)
goto out_put_actx;
+ ntfs_loc->ntfs_vol_p = ntfs_vol_p;
+ ntfs_loc->path = MALLOC(path_len + 1);
+ if (!ntfs_loc->path)
+ goto out_free_ntfs_loc;
+ memcpy(ntfs_loc->path, path, path_len + 1);
+ if (name_length) {
+ ntfs_loc->stream_name = MALLOC(name_length * 2);
+ if (!ntfs_loc->stream_name)
+ goto out_free_ntfs_loc;
+ memcpy(ntfs_loc->stream_name,
+ attr_record_name(actx->attr),
+ actx->attr->name_length * 2);
+ ntfs_loc->stream_name_nchars = name_length;
}
- /* Checksum the stream. */
- ret = ntfs_attr_sha1sum(ni, actx->attr, attr_hash,
- type == AT_REPARSE_POINT, &reparse_tag);
- if (ret != 0)
- goto out_put_actx;
-
- if (type == AT_REPARSE_POINT)
- inode->i_reparse_tag = reparse_tag;
- /* Make a lookup table entry for the stream, or use an existing
- * one if there's already an identical stream. */
- lte = __lookup_resource(lookup_table, attr_hash);
- ret = WIMLIB_ERR_NOMEM;
- if (lte) {
- lte->refcnt++;
+ lte = new_lookup_table_entry();
+ if (!lte)
+ goto out_free_ntfs_loc;
+ lte->ntfs_loc = ntfs_loc;
+ lte->resource_location = RESOURCE_IN_NTFS_VOLUME;
+ #if 0
+ if (type == AT_REPARSE_POINT) {
+ ntfs_loc->is_reparse_point = true;
+ lte->resource_entry.original_size = data_size - 8;
+ lte->resource_entry.size = data_size - 8;
} else {
- ntfs_loc = CALLOC(1, sizeof(*ntfs_loc));
- if (!ntfs_loc)
- goto out_put_actx;
- ntfs_loc->ntfs_vol_p = ntfs_vol_p;
- ntfs_loc->path = MALLOC(path_len + 1);
- if (!ntfs_loc->path)
- goto out_free_ntfs_loc;
- memcpy(ntfs_loc->path, path, path_len + 1);
- if (name_length) {
- ntfs_loc->stream_name = MALLOC(name_length * 2);
- if (!ntfs_loc->stream_name)
- goto out_free_ntfs_loc;
- memcpy(ntfs_loc->stream_name,
- attr_record_name(actx->attr),
- actx->attr->name_length * 2);
- ntfs_loc->stream_name_nchars = name_length;
- }
-
- lte = new_lookup_table_entry();
- if (!lte)
- goto out_free_ntfs_loc;
- lte->ntfs_loc = ntfs_loc;
- lte->resource_location = RESOURCE_IN_NTFS_VOLUME;
- if (type == AT_REPARSE_POINT) {
- ntfs_loc->is_reparse_point = true;
- lte->resource_entry.original_size = data_size - 8;
- lte->resource_entry.size = data_size - 8;
- } else {
- ntfs_loc->is_reparse_point = false;
- lte->resource_entry.original_size = data_size;
- lte->resource_entry.size = data_size;
- }
- ntfs_loc = NULL;
- copy_hash(lte->hash, attr_hash);
- lookup_table_insert(lookup_table, lte);
+ ntfs_loc->is_reparse_point = false;
+ lte->resource_entry.original_size = data_size;
+ lte->resource_entry.size = data_size;
}
+ #else
+ ntfs_loc->is_reparse_point = (type == AT_REPARSE_POINT);
+ lte->resource_entry.original_size = data_size;
+ #endif
+ ntfs_loc = NULL;
}
if (name_length == 0) {
/* Unnamed data stream. Put the reference to it in the
* dentry's inode. */
if (inode->i_lte) {
- WARNING("Found two un-named data streams for "
- "`%s'", path);
- free_lookup_table_entry(lte);
- } else {
- inode->i_lte = lte;
+ ERROR("Found two un-named data streams for `%s'",
+ path);
+ ret = WIMLIB_ERR_NTFS_3G;
+ goto out_free_lte;
}
+ back_ptr = &inode->i_lte;
} else {
/* Named data stream. Put the reference to it in the
* alternate data stream entries */
if (!new_ads_entry)
goto out_free_lte;
wimlib_assert(new_ads_entry->stream_name_nbytes == name_length * 2);
- new_ads_entry->lte = lte;
+ back_ptr = &new_ads_entry->lte;
}
+ lookup_table_insert_unhashed(lookup_table, lte, back_ptr);
}
ret = 0;
goto out_put_actx;
git://wimlib.net / wimlib / blobdiff