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//! AFS write operations
const cluster = @import("cluster.zig");
const compare = @import("../../utils/string/compare.zig");
const copy = @import("../../utils/mem/copy.zig");
const fs = @import("../../common/constants/fs.zig");
const int = @import("../../utils/types/int.zig");
const location = @import("location.zig");
const ptr = @import("../../utils/types/ptr.zig");
const read = @import("read.zig");
const types = @import("types.zig");
pub fn navigate_to_stack(afs: anytype, loc: []const u8) !u32 {
var current = afs.root_cluster;
var start: usize = location.skip_root(loc);
var i: usize = start;
while (i <= loc.len) : (i += 1) {
const is_end = (i == loc.len);
const is_slash = !is_end and loc[i] == '/';
if (is_slash or is_end) {
if (i > start) {
const component = loc[start..i];
const entry = read.find_entry(afs, current, component) orelse return error.NotFound;
if (!entry.is_stack()) return error.NotAStack;
current = entry.first_cluster;
}
start = i + 1;
}
}
return current;
}
pub fn create_unit(afs: anytype, loc: []const u8) !void {
const parent_loc = location.parent(loc);
const ident = location.identity(loc);
if (ident.len == 0 or ident.len > fs.MAX_IDENTITY_LEN) {
return error.InvalidIdentity;
}
var parent_cluster = afs.root_cluster;
if (parent_loc.len > 1) {
parent_cluster = try navigate_to_stack(afs, parent_loc);
}
if (read.find_entry(afs, parent_cluster, ident)) |_| {
return error.UnitExists;
}
const unit_cluster = try cluster.allocate(afs);
var new_entry = types.Entry{
.entry_type = fs.ENTRY_TYPE_UNIT,
.name_len = int.u8_of(ident.len),
.name = undefined,
.owner_name_len = 0,
.owner_name = undefined,
.permission_type = fs.PERM_OWNER,
.reserved = 0,
.first_cluster = unit_cluster,
.size = 0,
.created_time = 0,
.modified_time = 0,
};
copy.zero(&new_entry.name);
copy.zero(&new_entry.owner_name);
copy.bytes(new_entry.name[0..ident.len], ident);
try add_stack_entry(afs, parent_cluster, new_entry);
}
pub fn mark_unit(afs: anytype, loc: []const u8, data: []const u8) !void {
const parent_loc = location.parent(loc);
const ident = location.identity(loc);
var parent_cluster = afs.root_cluster;
if (parent_loc.len > 1) {
parent_cluster = try navigate_to_stack(afs, parent_loc);
}
const entry = read.find_entry(afs, parent_cluster, ident) orelse {
try create_unit(afs, loc);
const new_entry = read.find_entry(afs, parent_cluster, ident) orelse return error.CreateFailed;
try mark_unit_data(afs, new_entry.first_cluster, data);
try update_unit_size(afs, parent_cluster, ident, data.len);
return;
};
try mark_unit_data(afs, entry.first_cluster, data);
try update_unit_size(afs, parent_cluster, ident, data.len);
}
pub fn mark_unit_data(afs: anytype, start_cluster: u32, data: []const u8) !void {
var remaining = data.len;
var offset: usize = 0;
var current = start_cluster;
while (remaining > 0) {
const chunk = @min(remaining, fs.SECTOR_SIZE);
const lba = cluster.to_lba(afs, current);
var sector: [fs.SECTOR_SIZE]u8 align(fs.SECTOR_ALIGN) = undefined;
copy.zero(§or);
copy.bytes(sector[0..chunk], data[offset .. offset + chunk]);
if (!afs.device.write_sector(lba, §or)) {
return error.WriteFailed;
}
remaining -= chunk;
offset += chunk;
if (remaining > 0) {
const next = try cluster.allocate(afs);
try cluster.write_alloc(afs, current, next);
current = next;
} else {
try cluster.write_alloc(afs, current, fs.CLUSTER_END);
}
}
}
pub fn add_stack_entry(afs: anytype, stack_cluster: u32, entry: types.Entry) !void {
var current = stack_cluster;
while (cluster.is_valid(current)) {
const lba = cluster.to_lba(afs, current);
var sector: [fs.SECTOR_SIZE]u8 align(fs.SECTOR_ALIGN) = undefined;
if (!afs.device.read_sector(lba, §or)) {
return error.ReadFailed;
}
const existing = ptr.of(types.Entry, @intFromPtr(§or));
if (existing.is_end()) {
const entry_bytes = @as([*]const u8, @ptrCast(&entry))[0..@sizeOf(types.Entry)];
copy.bytes(sector[0..@sizeOf(types.Entry)], entry_bytes);
if (!afs.device.write_sector(lba, §or)) {
return error.WriteFailed;
}
return;
}
current = cluster.get_next(afs, current) catch {
const new_cluster = try cluster.allocate(afs);
try cluster.write_alloc(afs, stack_cluster, new_cluster);
copy.zero(§or);
const entry_bytes = @as([*]const u8, @ptrCast(&entry))[0..@sizeOf(types.Entry)];
copy.bytes(sector[0..@sizeOf(types.Entry)], entry_bytes);
if (!afs.device.write_sector(cluster.to_lba(afs, new_cluster), §or)) {
return error.WriteFailed;
}
return;
};
}
return error.StackFull;
}
pub fn update_unit_size(afs: anytype, stack_cluster: u32, ident: []const u8, new_size: usize) !void {
var current = stack_cluster;
while (cluster.is_valid(current)) {
const lba = cluster.to_lba(afs, current);
var sector: [fs.SECTOR_SIZE]u8 align(fs.SECTOR_ALIGN) = undefined;
if (!afs.device.read_sector(lba, §or)) {
return error.ReadFailed;
}
const entry = ptr.of(types.Entry, @intFromPtr(§or));
if (entry.is_end()) return error.NotFound;
if (compare.equals(entry.get_identity(), ident)) {
entry.size = new_size;
if (!afs.device.write_sector(lba, §or)) {
return error.WriteFailed;
}
return;
}
current = cluster.get_next(afs, current) catch return error.NotFound;
}
return error.NotFound;
}
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