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//! FAT32 Entry Types (Stack/Unit entries)
const std = @import("std");
const constants = @import("shared").fat32.constants;
pub const StackEntry = extern struct {
Identity: [8]u8,
Extension: [3]u8,
Attributes: u8,
ReservedNt: u8,
CreationTimeTenths: u8,
CreationTime: u16 align(1),
CreationDate: u16 align(1),
LastAccessDate: u16 align(1),
FirstClusterHigh: u16 align(1),
WriteTime: u16 align(1),
WriteDate: u16 align(1),
FirstClusterLow: u16 align(1),
UnitSize: u32 align(1),
pub fn isFree(self: *const StackEntry) bool {
return self.Identity[0] == constants.entries.ENTRY_FREE;
}
pub fn isEnd(self: *const StackEntry) bool {
return self.Identity[0] == constants.entries.ENTRY_END;
}
pub fn isLongIdentity(self: *const StackEntry) bool {
return (self.Attributes & constants.attributes.ATTR_LONG_IDENTITY_MASK) == constants.attributes.ATTR_LONG_IDENTITY;
}
pub fn isStack(self: *const StackEntry) bool {
return (self.Attributes & constants.attributes.ATTR_STACK) != 0;
}
pub fn isVolumeId(self: *const StackEntry) bool {
return (self.Attributes & constants.attributes.ATTR_VOLUME_ID) != 0;
}
pub fn getFirstCluster(self: *const StackEntry) u32 {
return (@as(u32, self.FirstClusterHigh) << @bitSizeOf(u16)) | self.FirstClusterLow;
}
pub fn setFirstCluster(self: *StackEntry, cluster: u32) void {
self.FirstClusterHigh = @truncate(cluster >> @bitSizeOf(u16));
self.FirstClusterLow = @truncate(cluster);
}
pub fn getShortIdentity(self: *const StackEntry, buffer: *[constants.sizes.SHORT_DISPLAY_LENGTH]u8) usize {
var length: usize = 0;
var first_byte = self.Identity[0];
if (first_byte == constants.entries.ENTRY_KANJI_LEAD) {
first_byte = constants.entries.ENTRY_FREE;
}
var index: usize = 0;
while (index < constants.sizes.SHORT_IDENTITY_LENGTH and self.Identity[index] != ' ') : (index += 1) {
if (index == 0) {
buffer[length] = first_byte;
} else {
buffer[length] = self.Identity[index];
}
length += 1;
}
if (self.Extension[0] != ' ') {
buffer[length] = '.';
length += 1;
var ext_index: usize = 0;
while (ext_index < constants.sizes.SHORT_EXT_LENGTH and self.Extension[ext_index] != ' ') : (ext_index += 1) {
buffer[length] = self.Extension[ext_index];
length += 1;
}
}
return length;
}
};
pub const LongIdentityEntry = extern struct {
Sequence: u8,
Identity1: [10]u8,
Attributes: u8,
EntryType: u8,
Checksum: u8,
Identity2: [12]u8,
FirstCluster: u16 align(1),
Identity3: [4]u8,
pub fn isLast(self: *const LongIdentityEntry) bool {
return (self.Sequence & constants.entries.LFN_LAST_ENTRY) != 0;
}
pub fn getSequence(self: *const LongIdentityEntry) u8 {
return self.Sequence & constants.entries.LFN_SEQUENCE_MASK;
}
pub fn extractChars(self: *const LongIdentityEntry, buffer: *[constants.entries.LFN_CHARS_PER_ENTRY]u16) void {
var char_index: usize = 0;
var byte_index: usize = 0;
while (byte_index < self.Identity1.len) : (byte_index += @sizeOf(u16)) {
buffer[char_index] = std.mem.readInt(u16, self.Identity1[byte_index..][0..@sizeOf(u16)], .little);
char_index += 1;
}
byte_index = 0;
while (byte_index < self.Identity2.len) : (byte_index += @sizeOf(u16)) {
buffer[char_index] = std.mem.readInt(u16, self.Identity2[byte_index..][0..@sizeOf(u16)], .little);
char_index += 1;
}
byte_index = 0;
while (byte_index < self.Identity3.len) : (byte_index += @sizeOf(u16)) {
buffer[char_index] = std.mem.readInt(u16, self.Identity3[byte_index..][0..@sizeOf(u16)], .little);
char_index += 1;
}
}
};
pub const TimeFormat = packed struct(u16) {
SecondDiv2: u5,
Minute: u6,
Hour: u5,
};
pub const DateFormat = packed struct(u16) {
Day: u5,
Month: u4,
YearFrom1980: u7,
};
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