refactor: move types to zip format folder

src/format/aes.rs

@@ -0,0 +1,117 @@
+//! AES related specifications
+
+use core::fmt::Display;
+
+/// The encryption specification used to encrypt a file with AES.
+///
+/// According to the [specification](https://www.winzip.com/win/en/aes_info.html#winzip11) AE-2
+/// does not make use of the CRC check.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u16)]
+pub enum AesVendorVersion {
+    Ae1 = 0x0001,
+    Ae2 = 0x0002,
+}
+
+impl AesVendorVersion {
+    /// As u16
+    #[must_use]
+    pub const fn as_u16(self) -> u16 {
+        self as u16
+    }
+
+    /// Returns `true` if the data is encrypted using AE2.
+    #[cfg(feature = "aes-crypto")]
+    pub const fn is_ae2_encrypted(&self) -> bool {
+        matches!(self, AesVendorVersion::Ae2)
+    }
+
+    /// `false` since the feature `aes-crypto` is not enabled
+    #[cfg(not(feature = "aes-crypto"))]
+    pub const fn is_ae2_encrypted(&self) -> bool {
+        false
+    }
+}
+
+impl TryFrom<u16> for AesVendorVersion {
+    type Error = &'static str;
+
+    fn try_from(value: u16) -> Result<Self, Self::Error> {
+        let aes_vendor_version = match value {
+            0x0001 => AesVendorVersion::Ae1,
+            0x0002 => AesVendorVersion::Ae2,
+            _ => return Err("Invalid AES vendor version"),
+        };
+        Ok(aes_vendor_version)
+    }
+}
+
+impl From<AesVendorVersion> for u16 {
+    fn from(value: AesVendorVersion) -> Self {
+        value as u16
+    }
+}
+
+/// AES variant used.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "_arbitrary", derive(arbitrary::Arbitrary))]
+#[repr(u8)]
+pub enum AesMode {
+    /// 128-bit AES encryption.
+    Aes128 = 0x01,
+    /// 192-bit AES encryption.
+    Aes192 = 0x02,
+    /// 256-bit AES encryption.
+    Aes256 = 0x03,
+}
+
+impl AesMode {
+    /// As u8
+    #[must_use]
+    pub const fn as_u8(self) -> u8 {
+        self as u8
+    }
+}
+
+impl Display for AesMode {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match self {
+            Self::Aes128 => write!(f, "AES-128"),
+            Self::Aes192 => write!(f, "AES-192"),
+            Self::Aes256 => write!(f, "AES-256"),
+        }
+    }
+}
+
+impl TryFrom<u8> for AesMode {
+    type Error = &'static str;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        let mode = match value {
+            0x01 => AesMode::Aes128,
+            0x02 => AesMode::Aes192,
+            0x03 => AesMode::Aes256,
+            _ => return Err("Invalid AES encryption strength"),
+        };
+        Ok(mode)
+    }
+}
+
+#[cfg(feature = "aes-crypto")]
+impl AesMode {
+    /// Length of the salt for the given AES mode.
+    #[must_use]
+    pub const fn salt_length(&self) -> usize {
+        self.key_length() / 2
+    }
+
+    /// Length of the key for the given AES mode.
+    #[must_use]
+    pub const fn key_length(&self) -> usize {
+        match self {
+            Self::Aes128 => 16,
+            Self::Aes192 => 24,
+            Self::Aes256 => 32,
+        }
+    }
+}

src/format/flags.rs

@@ -0,0 +1,160 @@
+//! Flags of zip
+
+/// System inside `version made by` (upper byte)
+/// Reference: 4.4.2.2
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+#[allow(clippy::upper_case_acronyms)]
+#[repr(u8)]
+pub enum System {
+    /// `MS-DOS` and `OS/2` (`FAT` / `VFAT` / `FAT32` file systems; default on Windows)
+    Dos = 0,
+    /// `Amiga`
+    Amiga = 1,
+    /// `OpenVMS`
+    OpenVMS = 2,
+    /// Default on Unix; default for symlinks on all platforms
+    Unix = 3,
+    /// `VM/CMS`
+    VmCms = 4,
+    /// `Atari ST`
+    AtariSt = 5,
+    /// `OS/2 H.P.F.S.`
+    Os2 = 6,
+    /// Legacy `Mac OS`, pre `OS X`
+    Macintosh = 7,
+    /// `Z-System`
+    ZSystem = 8,
+    /// `CP/M`
+    CPM = 9,
+    /// Windows NTFS (with extra attributes; not used by default)
+    WindowsNTFS = 10,
+    /// `MVS (OS/390 - Z/OS)`
+    MVS = 11,
+    /// `VSE`
+    VSE = 12,
+    /// `Acorn Risc`
+    AcornRisc = 13,
+    /// `VFAT`
+    VFAT = 14,
+    /// alternate MVS
+    AlternateMVS = 15,
+    /// `BeOS`
+    BeOS = 16,
+    /// `Tandem`
+    Tandem = 17,
+    /// `OS/400`
+    Os400 = 18,
+    /// `OS X` (Darwin) (with extra attributes; not used by default)
+    OsDarwin = 19,
+    /// unused
+    #[default]
+    Unknown = 255,
+}
+
+impl System {
+    /// Parse `version_made_by` block in local entry block.
+    #[must_use]
+    pub fn from_version_made_by(version_made_by: u16) -> Self {
+        // Extract upper byte from little-endian representation
+        let upper_byte = version_made_by.to_le_bytes()[1];
+        System::from(upper_byte) // from u8
+    }
+
+    /// Extract the system and version from a `version_made_by` field.
+    /// The first byte (lower) is the version, and the second byte (upper) is the system.
+    pub(crate) fn extract_bytes(version_made_by: u16) -> (u8, Self) {
+        let bytes = version_made_by.to_le_bytes();
+        (bytes[0], Self::from(bytes[1]))
+    }
+}
+
+impl From<u8> for System {
+    fn from(system: u8) -> Self {
+        match system {
+            0 => System::Dos,
+            1 => System::Amiga,
+            2 => System::OpenVMS,
+            3 => System::Unix,
+            4 => System::VmCms,
+            5 => System::AtariSt,
+            6 => System::Os2,
+            7 => System::Macintosh,
+            8 => System::ZSystem,
+            9 => System::CPM,
+            10 => System::WindowsNTFS,
+            11 => System::MVS,
+            12 => System::VSE,
+            13 => System::AcornRisc,
+            14 => System::VFAT,
+            15 => System::AlternateMVS,
+            16 => System::BeOS,
+            17 => System::Tandem,
+            18 => System::Os400,
+            19 => System::OsDarwin,
+            _ => System::Unknown,
+        }
+    }
+}
+
+impl From<System> for u8 {
+    fn from(system: System) -> Self {
+        system as u8
+    }
+}
+
+/// Zip flags
+/// Stored as Little endian
+#[allow(unused)]
+#[rustfmt::skip]
+#[repr(u16)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[non_exhaustive]
+pub(crate) enum ZipFlags {
+    /// If set, indicates that the file is encrypted.
+    Encrypted                   = 0b0000_0000_0000_0001,
+    CompressionSetting          = 0b0000_0000_0000_0010,
+    CompressionSetting2         = 0b0000_0000_0000_0100,
+    /// If this bit is set, the fields crc-32, compressed size and uncompressed size are set to zero in the  local header.
+    /// The correct values are put in the data descriptor immediately following the compressed data.
+    UsingDataDescriptor         = 0b0000_0000_0000_1000,
+    /// Reserved for use with method 8, for enhanced deflating.
+    ReservedEnhancedDeflating   = 0b0000_0000_0001_0000,
+    /// If this bit is set, this indicates that the file is compressed patched data.
+    CompressedPatchedData       = 0b0000_0000_0010_0000,
+    /// Strong encryption.
+    /// If this bit is set, you MUST set the version needed to extract value to at least 50 and you MUST also set bit 0.
+    /// If AES encryption is used, the version needed to extract value MUST be at least 51.
+    StrongEncryption            = 0b0000_0000_0100_0000,
+    // bit 7 Currently unused   = 0b0000_0000_1000_0000;
+    // bit 8 Currently unused   = 0b0000_0001_0000_0000;
+    // bit 9 Currently unused   = 0b0000_0010_0000_0000;
+    // bit 10 Currently unused  = 0b0000_0100_0000_0000;
+
+    /// Language encoding flag (EFS).
+    /// If this bit is set, the filename and comment fields for this file MUST be encoded using UTF-8.
+    LanguageEncoding            = 0b0000_1000_0000_0000,
+    /// Reserved by PKWARE for enhanced compression.
+    ReservedEnhancedCompression = 0b0001_0000_0000_0000,
+    /// Set when encrypting the Central Directory to indicate selected data values in the Local Header are masked to hide their actual values.
+    Masked                      = 0b0010_0000_0000_0000,
+    /// Reserved by PKWARE for alternate streams.
+    ReservedAlternateStream     = 0b0100_0000_0000_0000,
+    /// Reserved by PKWARE.
+    Reserved                    = 0b1000_0000_0000_0000,
+}
+
+impl ZipFlags {
+    pub(crate) fn matching(flags: u16, matching_flag: Self) -> bool {
+        flags & u16::from(matching_flag) != 0
+    }
+
+    pub(crate) const fn as_u16(self) -> u16 {
+        self as u16
+    }
+}
+
+impl From<ZipFlags> for u16 {
+    fn from(value: ZipFlags) -> u16 {
+        value.as_u16()
+    }
+}

src/format/mod.rs

@@ -0,0 +1,4 @@
+//! Zip format
+
+pub(crate) mod aes;
+pub(crate) mod flags;

src/lib.rs

@@ -16,10 +16,11 @@
 #![allow(clippy::multiple_crate_versions)] // https://github.com/rust-lang/rust-clippy/issues/16440
 pub use crate::compression::{CompressionMethod, SUPPORTED_COMPRESSION_METHODS};
 pub use crate::datetime::DateTime;
+pub use crate::format::aes::AesMode;
+pub use crate::format::flags::System;
 pub use crate::read::HasZipMetadata;
 pub use crate::read::{ZipArchive, ZipReadOptions};
 pub use crate::spec::{ZIP64_BYTES_THR, ZIP64_ENTRY_THR};
-pub use crate::types::{AesMode, System};
 pub use crate::write::ZipWriter;
 
 #[cfg(feature = "aes-crypto")]
@@ -33,6 +34,7 @@ mod cp437;
 mod crc32;
 mod datetime;
 pub mod extra_fields;
+mod format;
 mod path;
 pub mod read;
 pub mod result;

src/read/mod.rs

@@ -9,7 +9,7 @@ use crate::extra_fields::Zip64ExtendedInformation;
 use crate::extra_fields::{ExtendedTimestamp, ExtraField, Ntfs, UsedExtraField};
 use crate::result::{ZipError, ZipResult, invalid};
 use crate::spec::{
-    CentralDirectoryEndInfo, DataAndPosition, FixedSizeBlock, ZipCentralEntryBlock, ZipFlags,
+    CentralDirectoryEndInfo, DataAndPosition, FixedSizeBlock,  ZipCentralEntryBlock,
 };
 use crate::types::{System, ZipFileData};
 use crate::unstable::LittleEndianReadExt;

src/read/stream.rs

@@ -1,6 +1,7 @@
 //! Code related to stream reading
 
 use crate::ZipReadOptions;
+use crate::format::flags::ZipFlags;
 use crate::read::parse_extra_field;
 use crate::read::readers::{make_crypto_reader, make_reader};
 use crate::read::{

src/spec.rs

@@ -53,63 +53,6 @@ impl Magic {
     pub const DATA_DESCRIPTOR_SIGNATURE: Self = Self::literal(0x0807_4b50);
 }
 
-/// Zip flags
-/// Stored as Little endian
-#[allow(unused)]
-#[rustfmt::skip]
-#[repr(u16)]
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
-#[non_exhaustive]
-pub(crate) enum ZipFlags {
-    /// If set, indicates that the file is encrypted.
-    Encrypted                   = 0b0000_0000_0000_0001,
-    CompressionSetting          = 0b0000_0000_0000_0010,
-    CompressionSetting2         = 0b0000_0000_0000_0100,
-    /// If this bit is set, the fields crc-32, compressed size and uncompressed size are set to zero in the  local header.
-    /// The correct values are put in the data descriptor immediately following the compressed data.
-    UsingDataDescriptor         = 0b0000_0000_0000_1000,
-    /// Reserved for use with method 8, for enhanced deflating.
-    ReservedEnhancedDeflating   = 0b0000_0000_0001_0000,
-    /// If this bit is set, this indicates that the file is compressed patched data.
-    CompressedPatchedData       = 0b0000_0000_0010_0000,
-    /// Strong encryption.
-    /// If this bit is set, you MUST set the version needed to extract value to at least 50 and you MUST also set bit 0.
-    /// If AES encryption is used, the version needed to extract value MUST be at least 51.
-    StrongEncryption            = 0b0000_0000_0100_0000,
-    // bit 7 Currently unused   = 0b0000_0000_1000_0000;
-    // bit 8 Currently unused   = 0b0000_0001_0000_0000;
-    // bit 9 Currently unused   = 0b0000_0010_0000_0000;
-    // bit 10 Currently unused  = 0b0000_0100_0000_0000;
-
-    /// Language encoding flag (EFS).
-    /// If this bit is set, the filename and comment fields for this file MUST be encoded using UTF-8.
-    LanguageEncoding            = 0b0000_1000_0000_0000,
-    /// Reserved by PKWARE for enhanced compression.
-    ReservedEnhancedCompression = 0b0001_0000_0000_0000,
-    /// Set when encrypting the Central Directory to indicate selected data values in the Local Header are masked to hide their actual values.
-    Masked                      = 0b0010_0000_0000_0000,
-    /// Reserved by PKWARE for alternate streams.
-    ReservedAlternateStream     = 0b0100_0000_0000_0000,
-    /// Reserved by PKWARE.
-    Reserved                    = 0b1000_0000_0000_0000,
-}
-
-impl ZipFlags {
-    pub(crate) fn matching(flags: u16, matching_flag: Self) -> bool {
-        flags & u16::from(matching_flag) != 0
-    }
-
-    pub(crate) const fn as_u16(self) -> u16 {
-        self as u16
-    }
-}
-
-impl From<ZipFlags> for u16 {
-    fn from(value: ZipFlags) -> u16 {
-        value.as_u16()
-    }
-}
-
 /// The file size at which a ZIP64 record becomes necessary.
 ///
 /// If a file larger than this threshold attempts to be written, compressed or uncompressed, and