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//! AFS read operations
const cache = @import("cache.zig");
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 types = @import("types.zig");
pub fn find_entry(afs: anytype, stack_cluster: u32, identity: []const u8) ?types.Entry {
var current = stack_cluster;
while (cluster.is_valid(current)) {
var sector: [fs.SECTOR_SIZE]u8 align(fs.SECTOR_ALIGN) = undefined;
if (!afs.device.read_sector(cluster.to_lba(afs, current), §or)) {
return null;
}
const entry = ptr.of(types.Entry, @intFromPtr(§or));
if (entry.is_end()) return null;
if (entry.is_unit() or entry.is_stack()) {
if (compare.equals(entry.get_identity(), identity)) {
if (entry.is_stack()) {
cache.store(afs, entry.first_cluster, stack_cluster);
}
return entry.*;
}
}
current = cluster.get_next(afs, current) catch return null;
}
return null;
}
pub fn view_unit(afs: anytype, entry: types.Entry, buffer: []u8) !usize {
var current = entry.first_cluster;
var viewed: usize = 0;
while (cluster.is_valid(current)) {
var sector: [fs.SECTOR_SIZE]u8 align(fs.SECTOR_ALIGN) = undefined;
if (!afs.device.read_sector(cluster.to_lba(afs, current), §or)) {
return error.ReadFailed;
}
const to_copy = @min(fs.SECTOR_SIZE, entry.size - viewed);
const end = @min(viewed + to_copy, buffer.len);
copy.bytes(buffer[viewed..end], sector[0 .. end - viewed]);
viewed += to_copy;
if (viewed >= entry.size) break;
current = try cluster.get_next(afs, current);
}
return viewed;
}
pub fn list_stack(afs: anytype, stack_cluster: u32, items: []types.StackItem) !usize {
var current = stack_cluster;
var count: usize = 0;
while (cluster.is_valid(current)) {
var sector: [fs.SECTOR_SIZE]u8 align(fs.SECTOR_ALIGN) = undefined;
if (!afs.device.read_sector(cluster.to_lba(afs, current), §or)) {
return error.ReadFailed;
}
const entry = ptr.of(types.Entry, @intFromPtr(§or));
if (entry.is_end()) return count;
if (entry.is_unit() or entry.is_stack()) {
if (count >= items.len) return count;
copy.bytes(items[count].identity[0..entry.name_len], entry.get_identity());
items[count].identity_len = entry.name_len;
items[count].is_stack = entry.is_stack();
copy.bytes(items[count].owner_name[0..entry.owner_name_len], entry.get_owner());
items[count].owner_name_len = entry.owner_name_len;
items[count].permission_type = entry.permission_type;
items[count].modified_time = entry.modified_time;
items[count].size = if (entry.is_stack())
int.u32_of(calculate_stack_size(afs, entry.first_cluster) catch 0)
else
int.u32_of(entry.size);
count += 1;
}
current = cluster.get_next(afs, current) catch return count;
}
return count;
}
pub fn calculate_stack_size(afs: anytype, stack_cluster: u32) !u64 {
var current = stack_cluster;
var total: u64 = 0;
while (cluster.is_valid(current)) {
var sector: [fs.SECTOR_SIZE]u8 align(fs.SECTOR_ALIGN) = undefined;
if (!afs.device.read_sector(cluster.to_lba(afs, current), §or)) {
return error.ReadFailed;
}
const entry = ptr.of(types.Entry, @intFromPtr(§or));
if (entry.is_end()) return total;
if (entry.is_unit()) {
total += entry.size;
} else if (entry.is_stack()) {
total += calculate_stack_size(afs, entry.first_cluster) catch 0;
}
current = cluster.get_next(afs, current) catch return total;
}
return total;
}
pub fn get_unit_size(afs: anytype, loc: []const u8) !u64 {
if (loc.len == 0) return error.InvalidLocation;
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 = find_entry(afs, current, component) orelse return error.NotFound;
if (is_end) {
if (!entry.is_unit()) return error.NotAUnit;
return entry.size;
} else {
if (!entry.is_stack()) return error.NotAStack;
current = entry.first_cluster;
}
}
start = i + 1;
}
}
return error.InvalidLocation;
}
pub fn view_unit_at(afs: anytype, loc: []const u8, buffer: []u8) !usize {
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 = find_entry(afs, current, component) orelse return error.NotFound;
if (is_end) {
if (!entry.is_unit()) return error.NotAUnit;
return view_unit(afs, entry, buffer);
} else {
if (!entry.is_stack()) return error.NotAStack;
current = entry.first_cluster;
}
}
start = i + 1;
}
}
return error.InvalidLocation;
}
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