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/// pdb中的一个record info
/// 一组8个字节
#[derive(Default, Debug, Clone)]
pub(crate) struct PDBRecordInfo {
/// the offset of record n from the start of the PDB of this record
pub(crate) offset: u32,
/// bit field. The least significant four bits are used to represent the category values. These are the categories used to split the databases for viewing on the screen. A few of the 16 categories are pre-defined but the user can add their own. There is an undefined category for use if the user or programmer hasn't set this.
/// 0x10 (16 decimal) Secret record bit.
/// 0x20 (32 decimal) Record in use (busy bit).
/// 0x40 (64 decimal) Dirty record bit.
/// 0x80 (128, unsigned decimal) Delete record on next HotSync.
pub(crate) attribute: u8,
/// The unique ID for this record. Often just a sequential count from 0
/// 实际是只有3个字节，最高位的一个字节不使用
pub(crate) unique_id: u32,
}
#[derive(Default, Debug)]
pub(crate) struct PDBHeader {
// name(32)
pub(crate) name: [u8; 32],
// attribute(2)
///
/// 0x0002 Read-Only
/// 0x0004 Dirty AppInfoArea
/// 0x0008 Backup this database (i.e. no conduit exists)
/// 0x0010 (16 decimal) Okay to install newer over existing copy, if present on PalmPilot
/// 0x0020 (32 decimal) Force the PalmPilot to reset after this database is installed
/// 0x0040 (64 decimal) Don't allow copy of file to be beamed to other Pilot.
pub(crate) attribute: u16,
/// file version
pub(crate) version: u16,
/// No. of seconds since start of January 1, 1904.
///
/// [https://wiki.mobileread.com/wiki/PDB#PDB%20Times] 对于时间又有新的规定
///
/// If the time has the top bit set, it's an unsigned 32-bit number counting from 1st Jan 1904
///
/// If the time has the top bit clear, it's a signed 32-bit number counting from 1st Jan 1970.
pub(crate) createion_date: u32,
/// No. of seconds since start of January 1, 1904.
pub(crate) modify_date: u32,
/// No. of seconds since start of January 1, 1904.
pub(crate) last_backup_date: u32,
/// No. of seconds since start of January 1, 1904.
pub(crate) modification_number: u32,
/// offset to start of Application Info (if present) or null
pub(crate) app_info_id: u32,
/// offset to start of Sort Info (if present) or null
pub(crate) sort_info_id: u32,
/// See above table. (For Applications this data will be 'appl')
pub(crate) _type: [u8; 4],
/// See above table. This program will be launched if the file is tapped
pub(crate) creator: [u8; 4],
/// used internally to identify record
pub(crate) unique_id_seed: u32,
/// Only used when in-memory on Palm OS. Always set to zero in stored files.
pub(crate) next_record_list_id: u32,
/// number of records in the file - N
pub(crate) number_of_records: u16,
/// record，每个8个字节，所有list结束后，有两个字节的空隙，无实际意义
pub(crate) record_info_list: Vec<PDBRecordInfo>,
}
#[derive(Default, Debug)]
pub(crate) struct MOBIDOCHeader {
/// 1 == no compression, 2 = PalmDOC compression, 17480 = HUFF/CDIC compression
/// 之后跳过2字节无用
pub(crate) compression: u16,
/// Uncompressed length of the entire text of the book
pub(crate) length: u32,
/// Number of PDB records used for the text of the book.
pub(crate) record_count: u16,
/// Maximum size of each record containing text, always 4096
pub(crate) record_size: u16,
/// Current reading position, as an offset into the uncompressed text
/// 如果 compression = 17480 ，这个字段会被拆分开
pub(crate) position: u32,
/// compression = 17480 时才有该字段
/// 0 == no encryption, 1 = Old Mobipocket Encryption, 2 = Mobipocket Encryption
pub(crate) encrypt_type: u16,
}
#[derive(Default, Debug)]
pub(crate) struct MOBIHeader {
// the characters M O B I
/// the length of the MOBI header, including the previous 4 bytes
pub(crate) header_len: u32,
/// The kind of Mobipocket file this is
/// 2 Mobipocket Book
/// 3 PalmDoc Book
/// 4 Audio
/// 232 mobipocket? generated by kindlegen1.2
/// 248 KF8: generated by kindlegen2
/// 257 News
/// 258 News_Feed
/// 259 News_Magazine
/// 513 PICS
/// 514 WORD
/// 515 XLS
/// 516 PPT
/// 517 TEXT
/// 518 HTML
pub(crate) mobi_type: u32,
/// 1252 = CP1252 (WinLatin1); 65001 = UTF-8
pub(crate) text_encoding: u32,
/// Some kind of unique ID number (random?)
pub(crate) unique_id: u32,
/// Version of the Mobipocket format used in this file.
pub(crate) file_version: u32,
/// Section number of orthographic meta index. 0xFFFFFFFF if index is not available.
pub(crate) ortographic_index: u32,
/// Section number of inflection meta index. 0xFFFFFFFF if index is not available.
pub(crate) inflection_index: u32,
/// 0xFFFFFFFF if index is not available.
pub(crate) index_names: u32,
/// 0xFFFFFFFF if index is not available.
pub(crate) index_keys: u32,
/// Section number of extra N meta index. 0xFFFFFFFF if index is not available.
pub(crate) extra_index: [u32; 6],
/// First record number (starting with 0) that's not the book's text
pub(crate) first_non_book_index: u32,
/// Offset in record 0 (not from start of file) of the full name of the book
pub(crate) full_name_offset: u32,
/// Length in bytes of the full name of the book
pub(crate) full_name_length: u32,
/// Book locale code. Low byte is main language 09= English, next byte is dialect, 08 = British, 04 = US. Thus US English is 1033, UK English is 2057.
pub(crate) locale: u32,
/// Input language for a dictionary
pub(crate) input_language: u32,
/// Output language for a dictionary
pub(crate) output_language: u32,
/// Minimum mobipocket version support needed to read this file.
pub(crate) min_version: u32,
/// First record number (starting with 0) that contains an image. Image records should be sequential.
pub(crate) first_image_index: u32,
/// The record number of the first huffman compression record.
pub(crate) huffman_record_offset: u32,
/// The number of huffman compression records.
pub(crate) huffman_record_count: u32,
/// offset
pub(crate) huffman_table_offset: u32,
/// len
pub(crate) huffman_table_length: u32,
/// bitfield. if bit 6 (0x40) is set, then there's an EXTH record
/// 当从低到高第六位为1，代表有EXTH，与其他bit无关
pub(crate) exth_flags: u32,
// 32 unknown bytes, if MOBI is long enough
// unknown_0: [u8; 8],
// /// Use 0xFFFFFFFF
// unknown_1: u32,
/// Offset to DRM key info in DRMed files. 0xFFFFFFFF if no DRM
/// 实际 没有drm这里是0？待测试
pub(crate) drm_offset: u32,
/// Number of entries in DRM info. 0xFFFFFFFF if no DRM
pub(crate) drm_count: u32,
/// Number of bytes in DRM info.
pub(crate) drm_size: u32,
/// Some flags concerning the DRM info.
pub(crate) drm_flags: u32,
// Bytes to the end of the MOBI header, including the following if the header length >= 228 (244 from start of record).Use 0x0000000000000000.
// unknown_2: u64,
/// Number of first text record. Normally 1.
pub(crate) first_content_record_number: u16,
/// Number of last image record or number of last text record if it contains no images. Includes Image, DATP, HUFF, DRM.
pub(crate) last_content_record_number: u16,
// FCIS record count? Use 0x00000001.
// unknown_3: u32,
pub(crate) fcis_record_number: u32,
// Use 0x00000001.
// unknown_4: u32,
pub(crate) flis_record_number: u32,
// Use 0x00000001.flis record count?
// unknown_5: u32,
// Use 0x0000000000000000.
// unknown_6: u64,
// Use 0xFFFFFFFF.
// unknown_7: u32,
/// Use 0x00000000.
pub(crate) first_compilation_data_section_count: u32,
/// Use 0xFFFFFFFF.
pub(crate) number_of_compilation_data_sections: u32,
// Use 0xFFFFFFFF.
// unknown_8: u32,
/// A set of binary flags, some of which indicate extra data at the end of each text block. This only seems to be valid for Mobipocket format version 5 and 6 (and higher?), when the header length is 228 (0xE4) or 232 (0xE8).
/// bit 1 (0x1) : <extra multibyte bytes><size>
/// bit 2 (0x2) : <TBS indexing description of this HTML record><size>
/// bit 3 (0x4) : <uncrossable breaks><size>
/// Setting bit 2 (0x2) disables <guide><reference type="start"> functionality.
pub(crate) extra_record_data_flags: u32,
/// (If not 0xFFFFFFFF)The record number of the first INDX record created from an ncx file.
pub(crate) indx_record_offset: u32,
}
#[derive(Default, Debug)]
pub(crate) struct EXTHRecord {
/// Exth Record type. Just a number identifying what's stored in the record
pub(crate) _type: u32,
/// length of EXTH record = L , including the 8 bytes in the type and length fields
pub(crate) len: u32,
/// Data，L - 8
pub(crate) data: Vec<u8>,
}
/// 参见 [https://wiki.mobileread.com/wiki/MOBI#EXTH_Header]
#[derive(Default, Debug)]
pub(crate) struct EXTHHeader {
// the characters E X T H
// identifier: [u8; 4],
/// the length of the EXTH header, including the previous 4 bytes - but not including the final padding.
pub(crate) len: u32,
/// The number of records in the EXTH header. the rest of the EXTH header consists of repeated EXTH records to the end of the EXTH length.
pub(crate) record_count: u32,
/// 不定长度的 record,
pub(crate) record_list: Vec<EXTHRecord>, // 多余的字节均为无用填充，跳过即可
}
/// 格式化时间戳
pub(crate) fn do_time_format(value: u32) -> String {
if value & 0x80000000 == 0x80000000 {
crate::common::DateTimeFormater::custom_start((value & 0x7fffffff) as u64, 1904)
.default_format()
} else {
crate::common::DateTimeFormater::new(value as u64).default_format()
}
}
fn u8_to_string<const N: usize>(v: [u8; N]) -> String {
// let mut v = [0u8;4];
// v[0] = (value >> 24 & 0xff) as u8;
// v[1]=(value >> 16 & 0xff) as u8;
// v[2] = (value >> 8 & 0xff) as u8;
// v[3] = (value & 0xff) as u8;
String::from_utf8(v.to_vec()).unwrap_or_default()
}
impl std::fmt::Display for PDBHeader {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
writeln!(f,"PDBHeader {{ name: '{}', attribute: {}, version: {}, createion_date: {}, modify_date: {}, last_backup_date: {}, modification_number: {}, app_info_id: {}, sort_info_id: {}, _type: {}, creator: {}, unique_id_seed: {}, next_record_list_id: {}, number_of_records: {}, record_info_list: {:?}, record_list: [] }}"
,u8_to_string(self.name)
,self.attribute
,self.version
,do_time_format(self.createion_date)
,do_time_format(self.modify_date)
,do_time_format(self.last_backup_date)
,self.modification_number
,self.app_info_id
,self.sort_info_id
,u8_to_string(self._type)
,u8_to_string(self.creator)
,self.unique_id_seed
,self.next_record_list_id
,self.number_of_records
,self.record_info_list
)
}
}