def tostring(self):
# UIDs (UID1 always 0x101f4a6b)
fields = [symbianutil.uidstostring(0x101f4a6bL, self.uid2, self.uid3)]
# Flags
fields.append(struct.pack("<B", self.flags))
# Longest resource (to be updated)
fields.append("\0\0")
# Unicode compression bitmap (no compression)
fields.append("\0" * ((len(self.resources) + 7) / 8))
# Resource contents
offsets = []
foffset = len("".join(fields))
maxrlen = 0
for res in self.resources:
# Find longest resource.
rlen = len(res)
if rlen > maxrlen:
maxrlen = rlen
offsets.append(foffset)
fields.append(res)
foffset += rlen
offsets.append(foffset)
# Update longest resource.
fields[2] = struct.pack("<H", maxrlen)
# Resource index
for off in offsets:
fields.append(struct.pack("<H", off))
# TODO: Ineffiecient. Improve.
return "".join(fields)
def tostring(self):
"""Convert this SIS instance to a (possibly very large) string."""
# Generate a SISInfo SISField.
infofield = sisfield.SISInfo(
UID=self.uid,
VendorUniqueName=self.vendorname,
Names=self.names,
VendorNames=self.vendornames,
Version=self.version,
CreationTime=self.creationtime,
InstallType=sisfield.EInstInstallation,
InstallFlags=0,
)
# Generate an empty SISSupportedOptions SISField.
# Option lists are not supported by SimpleSISWriter.
sa = sisfield.SISArray(SISFields=[], SISFieldType="SISSupportedOption")
optfield = sisfield.SISSupportedOptions(Options=sa)
# Convert language numbers to SISArray of SISLanguages
# and generate a SISSupportedLanguages SISField.
langfieldlist = []
for lang in self.languages:
langfieldlist.append(sisfield.SISLanguage(Language=lang))
sa = sisfield.SISArray(SISFields=langfieldlist, SISFieldType="SISLanguage")
langfield = sisfield.SISSupportedLanguages(Languages=sa)
# Generate SISPrerequisites SISField.
sa1 = sisfield.SISArray(SISFields=self.targetdevices, SISFieldType="SISDependency")
sa2 = sisfield.SISArray(SISFields=self.dependencies, SISFieldType="SISDependency")
prereqfield = sisfield.SISPrerequisites(TargetDevices=sa1, Dependencies=sa2)
# Generate SISProperties SISField.
sa = sisfield.SISArray(SISFields=self.properties, SISFieldType="SISProperty")
propfield = sisfield.SISProperties(Properties=sa)
# Generate SISInstallBlock SISField.
iffield = makelangconditional(self.languages, self.langdepfiles)
if iffield:
# Some language dependent files
iffieldlist = [iffield]
else:
# No language dependent files
iffieldlist = []
ibfield = makeinstallblock(self.files, [], iffieldlist)
# Generate a data index field. No embedded SIS files, index is 0.
didxfield = sisfield.SISDataIndex(DataIndex=0)
# Generate a SISController SISField without any signatures.
ctrlfield = sisfield.SISController(
Info=infofield,
Options=optfield,
Languages=langfield,
Prerequisites=prereqfield,
Properties=propfield,
Logo=self.logo,
InstallBlock=ibfield,
)
# Calculate metadata signature for each certificate.
certfieldlist = []
for cert in self.certificates:
# Calculate a signature of the SISController so far.
string = ctrlfield.tostring()
string = sisfield.stripheaderandpadding(string)
signature, algoid = signstring(cert[0], cert[2], string)
# Create a SISCertificateChain SISField from certificate data.
sf1 = sisfield.SISBlob(Data=cryptutil.certtobinary(cert[1]))
sf2 = sisfield.SISCertificateChain(CertificateData=sf1)
# Create a SISSignature SISField from calculated signature.
sf3 = sisfield.SISString(String=algoid)
sf4 = sisfield.SISSignatureAlgorithm(AlgorithmIdentifier=sf3)
sf5 = sisfield.SISBlob(Data=signature)
sf6 = sisfield.SISSignature(SignatureAlgorithm=sf4, SignatureData=sf5)
# Create a new SISSignatureCertificateChain SISField.
sa = sisfield.SISArray(SISFields=[sf6])
certfieldlist.append(sisfield.SISSignatureCertificateChain(Signatures=sa, CertificateChain=sf2))
# Add certificate to SISController SISField.
ctrlfield.setsignatures(certfieldlist)
# Finally add a data index field to SISController SISField.
# and wrap it in SISCompressed SISField.
ctrlfield.DataIndex = didxfield
ctrlcompfield = sisfield.SISCompressed(Data=ctrlfield, CompressionAlgorithm=sisfield.ECompressDeflate)
# Generate SISData SISField.
sa = sisfield.SISArray(SISFields=self.filedata, SISFieldType="SISFileData")
dufield = sisfield.SISDataUnit(FileData=sa)
sa = sisfield.SISArray(SISFields=[dufield])
datafield = sisfield.SISData(DataUnits=sa)
# Calculate SISController checksum.
# TODO: Requires an extra tostring() conversion.
ctrlcs = symbianutil.crc16ccitt(ctrlcompfield.tostring())
ctrlcsfield = sisfield.SISControllerChecksum(Checksum=ctrlcs)
# Calculate SISData checksum.
# TODO: Requires an extra tostring() conversion.
datacs = symbianutil.crc16ccitt(datafield.tostring())
datacsfield = sisfield.SISDataChecksum(Checksum=datacs)
# Generate SISContents SISField.
contentsfield = sisfield.SISContents(
ControllerChecksum=ctrlcsfield, DataChecksum=datacsfield, Controller=ctrlcompfield, Data=datafield
)
# Generate a SIS UID string.
uidstring = symbianutil.uidstostring(0x10201A7AL, 0x00000000L, self.uid.UID1)
# Return the completed SIS file as a string.
return uidstring + contentsfield.tostring()
