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https://github.com/limine-bootloader/limine
synced 2024-12-04 06:02:28 +03:00
Added support for resident directory indexes
This commit is contained in:
Itay Almog
parent
02ea23abfa
commit
f2486dcded
@ -45,6 +45,8 @@ struct ntfs_file_handle {
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// the runlist, resident index and attribute list of the
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// current open file/directory
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uint8_t run_list[128];
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uint8_t resident_index_size;
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uint8_t resident_index[256];
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// info about the current file
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uint32_t size_bytes;
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@ -75,6 +75,18 @@ struct file_record_attr_name {
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uint16_t name[];
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} __attribute__((packed));
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struct file_record_attr_index_root {
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uint32_t type;
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uint32_t collation;
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uint32_t size;
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uint8_t clusters_per_index_rec;
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uint8_t _padding[3];
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uint32_t offset;
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uint32_t total_size;
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uint32_t alloc_size;
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uint8_t flags;
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} __attribute__((packed));
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struct index_record {
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char name[4];
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uint16_t update_seq_offset;
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@ -295,53 +307,71 @@ static bool ntfs_read_directory(struct ntfs_file_handle *handle, uint64_t mft_re
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return false;
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//
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// get the runlist of the directory
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// First we get the data from the index root (aka resident entries)
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//
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// get the index alloc attribute, it should have the runlist offset
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// copy the runlist from it to our handle for easier access
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uint8_t *index_alloc_ptr;
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if (!ntfs_get_file_record_attr(file_record, FR_ATTRIBUTE_INDEX_ALLOC, &index_alloc_ptr))
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panic("NTFS: Directory has no runlist?!");
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struct file_record_attr_header_non_res *index_alloc = (struct file_record_attr_header_non_res *)index_alloc_ptr;
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uint8_t *runlist_ptr = index_alloc_ptr + index_alloc->run_offset;
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if (runlist_ptr - file_record + 128u > handle->file_record_size)
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panic("NTFS: runlist is outside of file record!");
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memcpy(handle->run_list, runlist_ptr, sizeof(handle->run_list));
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// calculate the directory size by just going through the runlist
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uint8_t *runlist = handle->run_list;
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uint64_t dir_size = 0;
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uint64_t cluster = 0;
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uint64_t cluster_count = 0;
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bool status = false;
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do {
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status = ntfs_get_next_run_list_element(&runlist, &cluster_count, &cluster, true);
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if (status)
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dir_size += cluster_count;
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} while(status);
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dir_size *= handle->bpb.sectors_per_cluster * handle->bpb.bytes_per_sector;
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// allocate a buffer for the directory data
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if (dir_buffer == NULL) {
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// allocate enough just in case, idk how much is good
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dir_buffer_cap = dir_size > 64 * 1024 ? dir_size : 64 * 1024;
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dir_buffer = ext_mem_alloc(dir_buffer_cap);
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uint8_t* index_root_ptr;
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if (ntfs_get_file_record_attr(file_record, FR_ATTRIBUTE_INDEX_ROOT, &index_root_ptr)) {
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// we have a resident index root
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struct file_record_attr_header_res *index_root_header = (struct file_record_attr_header_res *)index_root_ptr;
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struct file_record_attr_index_root *index_root = (struct file_record_attr_index_root *)(index_root_ptr + index_root_header->info_offset);
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uint8_t *index_root_data = (uint8_t *)index_root + index_root->offset + offsetof(struct file_record_attr_index_root, offset);
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if (index_root->total_size > sizeof(handle->resident_index))
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panic("NTFS: Resident index is too big!");
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handle->resident_index_size = index_root->total_size;
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memcpy(handle->resident_index, index_root_data, index_root->total_size);
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} else {
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// we must truncate it...
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if (dir_size > dir_buffer_cap) {
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dir_size = dir_buffer_cap;
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}
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// no resident data, clear
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handle->resident_index_size = 0;
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}
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// set the size of the dir size
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dir_buffer_size = dir_size;
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//
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// Now get the non-resident index records, for that we need to get the INDEX_ALLOC
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// attribute and read the runlist from that
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//
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uint8_t *index_alloc_ptr;
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if (ntfs_get_file_record_attr(file_record, FR_ATTRIBUTE_INDEX_ALLOC, &index_alloc_ptr)) {
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struct file_record_attr_header_non_res *index_alloc = (struct file_record_attr_header_non_res *)index_alloc_ptr;
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uint8_t *runlist_ptr = index_alloc_ptr + index_alloc->run_offset;
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if (runlist_ptr - file_record + 128u > handle->file_record_size)
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panic("NTFS: runlist is outside of file record!");
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memcpy(handle->run_list, runlist_ptr, sizeof(handle->run_list));
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// read the directory
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if (ntfs_read(handle, dir_buffer, 0, dir_size))
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panic("NTFS: EOF before reading directory fully...");
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// calculate the directory size by just going through the runlist
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uint8_t *runlist = handle->run_list;
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uint64_t dir_size = 0;
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uint64_t cluster = 0;
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uint64_t cluster_count = 0;
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bool status = false;
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do {
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status = ntfs_get_next_run_list_element(&runlist, &cluster_count, &cluster, true);
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if (status)
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dir_size += cluster_count;
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} while(status);
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dir_size *= handle->bpb.sectors_per_cluster * handle->bpb.bytes_per_sector;
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// allocate a buffer for the directory data
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if (dir_buffer == NULL) {
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// allocate enough just in case, idk how much is good
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dir_buffer_cap = dir_size > 64 * 1024 ? dir_size : 64 * 1024;
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dir_buffer = ext_mem_alloc(dir_buffer_cap);
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} else {
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// we must truncate it...
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if (dir_size > dir_buffer_cap) {
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dir_size = dir_buffer_cap;
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}
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}
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// set the size of the dir size
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dir_buffer_size = dir_size;
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// read the directory
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if (ntfs_read(handle, dir_buffer, 0, dir_size))
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panic("NTFS: EOF before reading directory fully...");
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} else {
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// if no runlist then empty the runlist
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memset(handle->run_list, 0, sizeof(handle->run_list));
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}
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return true;
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}
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@ -377,16 +407,61 @@ static void ntfs_read_root(struct ntfs_file_handle *handle) {
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panic("NTFS: Missing root directory file record!");
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}
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/**
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* Iterate the files over a single index with entries
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*/
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static bool ntfs_iterate_index_entries(struct ntfs_file_handle *handle, uint8_t *entry_ptr, size_t index_size, const char *filename, size_t filename_size, struct index_entry **out_entry) {
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// loop the record for all of its indexes
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while (index_size) {
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// get the entry, if size is zero we done
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struct index_entry *entry = (struct index_entry *)entry_ptr;
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if (entry->entry_size == 0)
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break;
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if (filename_size == entry->name_length) {
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// this name seem legit, need to get the real name from the mft
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// sometimes it works to use the index name but sometimes it has
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// invalid names for whatever reason that I can not understand, so
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// just always take it from the mft file record
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uint8_t file_record_buffer[MIN_FILE_RECORD_SIZE];
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if (!ntfs_get_file_record(handle, entry->mft_record, file_record_buffer))
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panic("NTFS: Failed to get file record");
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uint8_t *name_attr = NULL;
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if (!ntfs_get_file_record_attr(file_record_buffer, FR_ATTRIBUTE_NAME, &name_attr))
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panic("NTFS: File record missing name attribute");
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// get the offset to the actual info
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struct file_record_attr_header_res *header = (struct file_record_attr_header_res *)name_attr;
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struct file_record_attr_name *name = (struct file_record_attr_name *)(name_attr + header->info_offset);
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// compare the name
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for (int i = 0; i < name->name_length; i++) {
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if (name->name[i] != filename[i]) {
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goto next_entry;
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}
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}
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// name is good, return the entry and return true
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// that we found the entry
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*out_entry = entry;
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return true;
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}
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// next entry
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next_entry:
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entry_ptr += entry->entry_size;
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index_size -= entry->entry_size;
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}
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return false;
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}
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/**
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* Search for a file in the ntfs directory, assumes the directory has been read and is stored in
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* the temp buffer
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*/
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static bool ntfs_find_file_in_directory(struct ntfs_file_handle *handle, const char* filename, struct index_entry** out_entry) {
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size_t dir_size = dir_buffer_size;
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uint8_t *dir_ptr = dir_buffer;
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// TODO: iterate resident record...
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// get the size of the name we need to compare
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const char* temp_filename = filename;
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size_t filename_size = 0;
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@ -395,7 +470,13 @@ static bool ntfs_find_file_in_directory(struct ntfs_file_handle *handle, const c
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temp_filename++;
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}
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// iterate the non-resident files in the directory
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// first search in the resident records
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if (ntfs_iterate_index_entries(handle, handle->resident_index, handle->resident_index_size, filename, filename_size, out_entry))
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return true;
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// now iterate the non-resident files in the directory
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uint8_t *dir_ptr = dir_buffer;
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size_t dir_size = dir_buffer_size;
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size_t offset = 0;
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while (dir_size) {
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// check if the dir pointer is still in the buffer, if not then we could
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@ -413,53 +494,10 @@ static bool ntfs_find_file_in_directory(struct ntfs_file_handle *handle, const c
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size_t index_size = index_record->index_entry_size;
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offset += index_record->index_entry_offset + offsetof(struct index_record, index_entry_offset);
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uint8_t *entry_ptr = dir_ptr + offset;
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// loop the record for all of its indexes
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while (index_size) {
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// make sure we still have an entry
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if (entry_ptr + sizeof(struct index_entry) > dir_buffer + dir_buffer_size)
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panic("NTFS: Tried to read index entry outside of directory");
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// get the entry, if size is zero we done
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struct index_entry *entry = (struct index_entry *)entry_ptr;
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if (entry->entry_size == 0)
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break;
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if (filename_size == entry->name_length) {
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// this name seem legit, need to get the real name from the mft
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// sometimes it works to use the index name but sometimes it has
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// invalid names for whatever reason that I can not understand, so
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// just always take it from the mft file record
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uint8_t file_record_buffer[MIN_FILE_RECORD_SIZE];
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if (!ntfs_get_file_record(handle, entry->mft_record, file_record_buffer))
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panic("NTFS: Failed to get file record");
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uint8_t *name_attr = NULL;
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if (!ntfs_get_file_record_attr(file_record_buffer, FR_ATTRIBUTE_NAME, &name_attr))
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panic("NTFS: File record missing name attribute");
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// get the offset to the actual info
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struct file_record_attr_header_res *header = (struct file_record_attr_header_res *)name_attr;
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struct file_record_attr_name *name = (struct file_record_attr_name *)(name_attr + header->info_offset);
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// compare the name
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for (int i = 0; i < name->name_length; i++) {
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if (name->name[i] != filename[i]) {
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goto next_entry;
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}
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}
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// name is good, return the entry and return true
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// that we found the entry
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*out_entry = entry;
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return true;
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}
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// next entry
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next_entry:
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entry_ptr += entry->entry_size;
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index_size -= entry->entry_size;
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}
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// check if any of the entries is valid
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if (ntfs_iterate_index_entries(handle, entry_ptr, index_size, filename, filename_size, out_entry))
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return true;
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// next record, need to do some rounding
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index_size = index_record->index_entry_size;
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