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exth.go
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package mobi
// Type of EXTH record. If it's Binary/Numberic then read/write
// it using BigEndian, String is read/write using LittleEndian
type ExthType uint32
const (
EXTH_TYPE_NUMERIC ExthType = 0
EXTH_TYPE_STRING ExthType = 1
EXTH_TYPE_BINARY ExthType = 2
)
// EXTH record IDs
const (
EXTH_DRMSERVER uint32 = 1
EXTH_DRMCOMMERCE = 2
EXTH_DRMEBOOKBASE = 3
EXTH_TITLE = 99 /**< <dc:title> */
EXTH_AUTHOR = 100 /**< <dc:creator> */
EXTH_PUBLISHER = 101 /**< <dc:publisher> */
EXTH_IMPRINT = 102 /**< <imprint> */
EXTH_DESCRIPTION = 103 /**< <dc:description> */
EXTH_ISBN = 104 /**< <dc:identifier opf:scheme="ISBN"> */
EXTH_SUBJECT = 105 // Could appear multiple times /**< <dc:subject> */
EXTH_PUBLISHINGDATE = 106 /**< <dc:date> */
EXTH_REVIEW = 107 /**< <review> */
EXTH_CONTRIBUTOR = 108 /**< <dc:contributor> */
EXTH_RIGHTS = 109 /**< <dc:rights> */
EXTH_SUBJECTCODE = 110 /**< <dc:subject BASICCode="subjectcode"> */
EXTH_TYPE = 111 /**< <dc:type> */
EXTH_SOURCE = 112 /**< <dc:source> */
EXTH_ASIN = 113 // Kindle Paperwhite labels books with "Personal" if they don't have this record.
EXTH_VERSION = 114
EXTH_SAMPLE = 115 // 0x0001 if the book content is only a sample of the full book
EXTH_STARTREADING = 116 // Position (4-byte offset) in file at which to open when first opened /**< Start reading */
EXTH_ADULT = 117 // Mobipocket Creator adds this if Adult only is checked on its GUI; contents: "yes" /**< <adult> */
EXTH_PRICE = 118 // As text, e.g. "4.99" /**< <srp> */
EXTH_CURRENCY = 119 // As text, e.g. "USD" /**< <srp currency="currency"> */
EXTH_KF8BOUNDARY = 121
EXTH_FIXEDLAYOUT = 122 /**< <fixed-layout> */
EXTH_BOOKTYPE = 123 /**< <book-type> */
EXTH_ORIENTATIONLOCK = 124 /**< <orientation-lock> */
EXTH_COUNTRESOURCES = 125
EXTH_ORIGRESOLUTION = 126 /**< <original-resolution> */
EXTH_ZEROGUTTER = 127 /**< <zero-gutter> */
EXTH_ZEROMARGIN = 128 /**< <zero-margin> */
EXTH_KF8COVERURI = 129
EXTH_RESCOFFSET = 131
EXTH_REGIONMAGNI = 132 /**< <region-mag> */
EXTH_DICTNAME = 200 // As text /**< <DictionaryVeryShortName> */
EXTH_COVEROFFSET = 201 // Add to first image field in Mobi Header to find PDB record containing the cover image/**< <EmbeddedCover> */
EXTH_THUMBOFFSET = 202 // Add to first image field in Mobi Header to find PDB record containing the thumbnail cover image
EXTH_HASFAKECOVER = 203
EXTH_CREATORSOFT = 204 //Known Values: 1=mobigen, 2=Mobipocket Creator, 200=kindlegen (Windows), 201=kindlegen (Linux), 202=kindlegen (Mac).
EXTH_CREATORMAJOR = 205
EXTH_CREATORMINOR = 206
EXTH_CREATORBUILD = 207
EXTH_WATERMARK = 208
EXTH_TAMPERKEYS = 209
EXTH_FONTSIGNATURE = 300
EXTH_CLIPPINGLIMIT = 401 // Integer percentage of the text allowed to be clipped. Usually 10.
EXTH_PUBLISHERLIMIT = 402
EXTH_UNK403 = 403
EXTH_TTSDISABLE = 404 // 1 - Text to Speech disabled; 0 - Text to Speech enabled
EXTH_UNK405 = 405 // 1 in this field seems to indicate a rental book
EXTH_RENTAL = 406 // If this field is removed from a rental, the book says it expired in 1969
EXTH_UNK407 = 407
EXTH_UNK450 = 450
EXTH_UNK451 = 451
EXTH_UNK452 = 452
EXTH_UNK453 = 453
EXTH_DOCTYPE = 501 // PDOC - Personal Doc; EBOK - ebook; EBSP - ebook sample;
EXTH_LASTUPDATE = 502
EXTH_UPDATEDTITLE = 503
EXTH_ASIN504 = 504 // ?? ASIN in this record.
EXTH_TITLEFILEAS = 508
EXTH_CREATORFILEAS = 517
EXTH_PUBLISHERFILEAS = 522
EXTH_LANGUAGE = 524 /**< <dc:language> */
EXTH_ALIGNMENT = 525 // ?? horizontal-lr in this record /**< <primary-writing-mode> */
EXTH_PAGEDIR = 527
EXTH_OVERRIDEFONTS = 528 /**< <override-kindle-fonts> */
EXTH_SORCEDESC = 529
EXTH_DICTLANGIN = 531
EXTH_DICTLANGOUT = 532
EXTH_UNK534 = 534
EXTH_CREATORBUILDREV = 535
)
// EXTH Tag ID - Name - Type relationship
var ExthMeta = []mobiExthMeta{
{0, 0, ""},
{EXTH_SAMPLE, EXTH_TYPE_NUMERIC, "Sample"},
{EXTH_STARTREADING, EXTH_TYPE_NUMERIC, "Start offset"},
{EXTH_KF8BOUNDARY, EXTH_TYPE_NUMERIC, "K8 Boundary Offset"},
{EXTH_COUNTRESOURCES, EXTH_TYPE_NUMERIC, "K8 Resources Count"}, // of , fonts, images
{EXTH_RESCOFFSET, EXTH_TYPE_NUMERIC, "RESC Offset"},
{EXTH_COVEROFFSET, EXTH_TYPE_NUMERIC, "Cover Offset"},
{EXTH_THUMBOFFSET, EXTH_TYPE_NUMERIC, "Thumbnail Offset"},
{EXTH_HASFAKECOVER, EXTH_TYPE_NUMERIC, "Has Fake Cover"},
{EXTH_CREATORSOFT, EXTH_TYPE_NUMERIC, "Creator Software"},
{EXTH_CREATORMAJOR, EXTH_TYPE_NUMERIC, "Creator Major Version"},
{EXTH_CREATORMINOR, EXTH_TYPE_NUMERIC, "Creator Minor Version"},
{EXTH_CREATORBUILD, EXTH_TYPE_NUMERIC, "Creator Build Number"},
{EXTH_CLIPPINGLIMIT, EXTH_TYPE_NUMERIC, "Clipping Limit"},
{EXTH_PUBLISHERLIMIT, EXTH_TYPE_NUMERIC, "Publisher Limit"},
{EXTH_TTSDISABLE, EXTH_TYPE_NUMERIC, "Text-to-Speech Disabled"},
{EXTH_RENTAL, EXTH_TYPE_NUMERIC, "Rental Indicator"},
{EXTH_DRMSERVER, EXTH_TYPE_STRING, "DRM Server ID"},
{EXTH_DRMCOMMERCE, EXTH_TYPE_STRING, "DRM Commerce ID"},
{EXTH_DRMEBOOKBASE, EXTH_TYPE_STRING, "DRM Ebookbase Book ID"},
{EXTH_TITLE, EXTH_TYPE_STRING, "Title"},
{EXTH_AUTHOR, EXTH_TYPE_STRING, "Creator"},
{EXTH_PUBLISHER, EXTH_TYPE_STRING, "Publisher"},
{EXTH_IMPRINT, EXTH_TYPE_STRING, "Imprint"},
{EXTH_DESCRIPTION, EXTH_TYPE_STRING, "Description"},
{EXTH_ISBN, EXTH_TYPE_STRING, "ISBN"},
{EXTH_SUBJECT, EXTH_TYPE_STRING, "Subject"},
{EXTH_PUBLISHINGDATE, EXTH_TYPE_STRING, "Published"},
{EXTH_REVIEW, EXTH_TYPE_STRING, "Review"},
{EXTH_CONTRIBUTOR, EXTH_TYPE_STRING, "Contributor"},
{EXTH_RIGHTS, EXTH_TYPE_STRING, "Rights"},
{EXTH_SUBJECTCODE, EXTH_TYPE_STRING, "Subject Code"},
{EXTH_TYPE, EXTH_TYPE_STRING, "Type"},
{EXTH_SOURCE, EXTH_TYPE_STRING, "Source"},
{EXTH_ASIN, EXTH_TYPE_STRING, "ASIN"},
{EXTH_VERSION, EXTH_TYPE_STRING, "Version Number"},
{EXTH_ADULT, EXTH_TYPE_STRING, "Adult"},
{EXTH_PRICE, EXTH_TYPE_STRING, "Price"},
{EXTH_CURRENCY, EXTH_TYPE_STRING, "Currency"},
{EXTH_FIXEDLAYOUT, EXTH_TYPE_STRING, "Fixed Layout"},
{EXTH_BOOKTYPE, EXTH_TYPE_STRING, "Book Type"},
{EXTH_ORIENTATIONLOCK, EXTH_TYPE_STRING, "Orientation Lock"},
{EXTH_ORIGRESOLUTION, EXTH_TYPE_STRING, "Original Resolution"},
{EXTH_ZEROGUTTER, EXTH_TYPE_STRING, "Zero Gutter"},
{EXTH_ZEROMARGIN, EXTH_TYPE_STRING, "Zero margin"},
{EXTH_KF8COVERURI, EXTH_TYPE_STRING, "K8 Masthead/Cover Image"},
{EXTH_REGIONMAGNI, EXTH_TYPE_STRING, "Region Magnification"},
{EXTH_DICTNAME, EXTH_TYPE_STRING, "Dictionary Short Name"},
{EXTH_WATERMARK, EXTH_TYPE_STRING, "Watermark"},
{EXTH_DOCTYPE, EXTH_TYPE_STRING, "Document Type"},
{EXTH_LASTUPDATE, EXTH_TYPE_STRING, "Last Update Time"},
{EXTH_UPDATEDTITLE, EXTH_TYPE_STRING, "Updated Title"},
{EXTH_ASIN504, EXTH_TYPE_STRING, "ASIN (504)"},
{EXTH_TITLEFILEAS, EXTH_TYPE_STRING, "Title File As"},
{EXTH_CREATORFILEAS, EXTH_TYPE_STRING, "Creator File As"},
{EXTH_PUBLISHERFILEAS, EXTH_TYPE_STRING, "Publisher File As"},
{EXTH_LANGUAGE, EXTH_TYPE_STRING, "Language"},
{EXTH_ALIGNMENT, EXTH_TYPE_STRING, "Primary Writing Mode"},
{EXTH_PAGEDIR, EXTH_TYPE_STRING, "Page Progression Direction"},
{EXTH_OVERRIDEFONTS, EXTH_TYPE_STRING, "Override Kindle Fonts"},
{EXTH_SORCEDESC, EXTH_TYPE_STRING, "Original Source description"},
{EXTH_DICTLANGIN, EXTH_TYPE_STRING, "Dictionary Input Language"},
{EXTH_DICTLANGOUT, EXTH_TYPE_STRING, "Dictionary output Language"},
{EXTH_UNK534, EXTH_TYPE_STRING, "Unknown (534)"},
{EXTH_CREATORBUILDREV, EXTH_TYPE_STRING, "Kindlegen BuildRev Number"},
{EXTH_TAMPERKEYS, EXTH_TYPE_BINARY, "Tamper Proof Keys"},
{EXTH_FONTSIGNATURE, EXTH_TYPE_BINARY, "Font Signature"},
{EXTH_UNK403, EXTH_TYPE_BINARY, "Unknown (403)"},
{EXTH_UNK405, EXTH_TYPE_BINARY, "Unknown (405)"},
{EXTH_UNK407, EXTH_TYPE_BINARY, "Unknown (407)"},
{EXTH_UNK450, EXTH_TYPE_BINARY, "Unknown (450)"},
{EXTH_UNK451, EXTH_TYPE_BINARY, "Unknown (451)"},
{EXTH_UNK452, EXTH_TYPE_BINARY, "Unknown (452)"},
{EXTH_UNK453, EXTH_TYPE_BINARY, "Unknown (453)"}}
type mobiExth struct {
Identifier [4]uint8 `format:"string"`
HeaderLenght uint32 // The length of the EXTH header, including the previous 4 bytes - but not including the final padding.
RecordCount uint32 // 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.
Records []mobiExthRecord // Lenght of RecordCount
// []uint8 - lenght of X. Where X is the amount of bytes needed to reach multiples of 4 for the whole EXTH record
// According to Wiki padding null bytes are not included into header lenght calculation, but from what
// I see in mobi files, those bytes are included in total calculation.
}
type mobiExthRecord struct {
RecordType uint32 // Exth Record type. Just a number identifying what's stored in the record
RecordLength uint32 // Length of EXTH record = L , including the 8 bytes in the type and length fields
Value []uint8
}
// Copy from https://github.com/bfabiszewski/libmobi/blob/f4f75982f0c00b592c418bfcf3f9920600e81573/src/util.c
type mobiExthMeta struct {
ID uint32
Type ExthType
Name string
}
func (w *mobiExth) GetHeaderLenght() int {
elen := 12
for _, k := range w.Records {
elen += int(k.RecordLength)
}
Padding := elen % 4
elen += Padding
return elen
}
func (e *mobiExth) Add(recType uint32, Value interface{}) *mobiExth {
e.RecordCount++
var MetaType = getExthMetaByTag(recType)
var ExthRec mobiExthRecord = mobiExthRecord{RecordType: recType}
switch MetaType.Type {
case EXTH_TYPE_BINARY:
ExthRec.Value = Value.([]uint8)
case EXTH_TYPE_NUMERIC:
var castValue uint32
switch Value.(type) {
case int:
castValue = uint32(Value.(int))
case uint16:
castValue = uint32(Value.(uint16))
case uint32:
castValue = uint32(Value.(uint32))
case uint64:
castValue = uint32(Value.(uint64))
case int16:
castValue = uint32(Value.(int16))
case int32:
castValue = uint32(Value.(int32))
case int64:
castValue = uint32(Value.(int64))
default:
panic("EXTH_TYPE_NUMERIC type is unsupported")
}
ExthRec.Value = int32ToBytes(castValue)
case EXTH_TYPE_STRING:
switch Value.(type) {
case []uint8:
ExthRec.Value = Value.([]uint8)
case string:
ExthRec.Value = []uint8(Value.(string))
}
default:
panic("Unknown EXTH meta type")
}
ExthRec.RecordLength = uint32(8 + len(ExthRec.Value))
e.Records = append(e.Records, ExthRec)
return e
}