Sha256: be5bed6e32332f9e2ccd5047eee1af7f59c01a217b64381dedfeceb105cb124a
Contents?: true
Size: 1.75 KB
Versions: 16
Compression:
Stored size: 1.75 KB
Contents
package magic
import "bytes"
var (
// Pdf matches a Portable Document Format file.
// https://github.com/file/file/blob/11010cc805546a3e35597e67e1129a481aed40e8/magic/Magdir/pdf
Pdf = prefix(
// usual pdf signature
[]byte("%PDF-"),
// new-line prefixed signature
[]byte("\012%PDF-"),
// UTF-8 BOM prefixed signature
[]byte("\xef\xbb\xbf%PDF-"),
)
// Fdf matches a Forms Data Format file.
Fdf = prefix([]byte("%FDF"))
// Mobi matches a Mobi file.
Mobi = offset([]byte("BOOKMOBI"), 60)
// Lit matches a Microsoft Lit file.
Lit = prefix([]byte("ITOLITLS"))
)
// DjVu matches a DjVu file.
func DjVu(raw []byte, limit uint32) bool {
if len(raw) < 12 {
return false
}
if !bytes.HasPrefix(raw, []byte{0x41, 0x54, 0x26, 0x54, 0x46, 0x4F, 0x52, 0x4D}) {
return false
}
return bytes.HasPrefix(raw[12:], []byte("DJVM")) ||
bytes.HasPrefix(raw[12:], []byte("DJVU")) ||
bytes.HasPrefix(raw[12:], []byte("DJVI")) ||
bytes.HasPrefix(raw[12:], []byte("THUM"))
}
// P7s matches an .p7s signature File (PEM, Base64).
func P7s(raw []byte, limit uint32) bool {
// Check for PEM Encoding.
if bytes.HasPrefix(raw, []byte("-----BEGIN PKCS7")) {
return true
}
// Check if DER Encoding is long enough.
if len(raw) < 20 {
return false
}
// Magic Bytes for the signedData ASN.1 encoding.
startHeader := [][]byte{{0x30, 0x80}, {0x30, 0x81}, {0x30, 0x82}, {0x30, 0x83}, {0x30, 0x84}}
signedDataMatch := []byte{0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07}
// Check if Header is correct. There are multiple valid headers.
for i, match := range startHeader {
// If first bytes match, then check for ASN.1 Object Type.
if bytes.HasPrefix(raw, match) {
if bytes.HasPrefix(raw[i+2:], signedDataMatch) {
return true
}
}
}
return false
}
Version data entries
16 entries across 16 versions & 1 rubygems