diff options
Diffstat (limited to 'lib/backupstore/BackupStoreFilename.cpp')
| -rw-r--r-- | lib/backupstore/BackupStoreFilename.cpp | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/lib/backupstore/BackupStoreFilename.cpp b/lib/backupstore/BackupStoreFilename.cpp new file mode 100644 index 00000000..72cd1acd --- /dev/null +++ b/lib/backupstore/BackupStoreFilename.cpp @@ -0,0 +1,281 @@ +// -------------------------------------------------------------------------- +// +// File +// Name: BackupStoreFilename.cpp +// Purpose: Filename for the backup store +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- + +#include "Box.h" +#include "BackupStoreFilename.h" +#include "Protocol.h" +#include "BackupStoreException.h" +#include "IOStream.h" +#include "Guards.h" + +#include "MemLeakFindOn.h" + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::BackupStoreFilename() +// Purpose: Default constructor -- creates an invalid filename +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +BackupStoreFilename::BackupStoreFilename() +{ +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::BackupStoreFilename(const BackupStoreFilename &) +// Purpose: Copy constructor +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +BackupStoreFilename::BackupStoreFilename(const BackupStoreFilename &rToCopy) + : mEncryptedName(rToCopy.mEncryptedName) +{ +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::~BackupStoreFilename() +// Purpose: Destructor +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +BackupStoreFilename::~BackupStoreFilename() +{ +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::CheckValid(bool) +// Purpose: Checks the encoded filename for validity +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +bool BackupStoreFilename::CheckValid(bool ExceptionIfInvalid) const +{ + bool ok = true; + + if(mEncryptedName.size() < 2) + { + // Isn't long enough to have a header + ok = false; + } + else + { + // Check size is consistent + unsigned int dsize = BACKUPSTOREFILENAME_GET_SIZE(this->mEncryptedName); + if(dsize != mEncryptedName.size()) + { + ok = false; + } + + // And encoding is an accepted value + unsigned int encoding = BACKUPSTOREFILENAME_GET_ENCODING(this->mEncryptedName); + if(encoding < Encoding_Min || encoding > Encoding_Max) + { + ok = false; + } + } + + // Exception? + if(!ok && ExceptionIfInvalid) + { + THROW_EXCEPTION(BackupStoreException, InvalidBackupStoreFilename) + } + + return ok; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::ReadFromProtocol(Protocol &) +// Purpose: Reads the filename from the protocol object +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +void BackupStoreFilename::ReadFromProtocol(Protocol &rProtocol) +{ + // Read the header + char hdr[2]; + rProtocol.Read(hdr, 2); + + // How big is it? + int dsize = BACKUPSTOREFILENAME_GET_SIZE(hdr); + + // Fetch rest of data, relying on the Protocol to error on stupidly large sizes for us + std::string data; + rProtocol.Read(data, dsize - 2); + + // assign to this string, storing the header and the extra data + mEncryptedName.assign(hdr, 2); + mEncryptedName.append(data.c_str(), data.size()); + + // Check it + CheckValid(); + + // Alert derived classes + EncodedFilenameChanged(); +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::WriteToProtocol(Protocol &) +// Purpose: Writes the filename to the protocol object +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +void BackupStoreFilename::WriteToProtocol(Protocol &rProtocol) const +{ + CheckValid(); + + rProtocol.Write(mEncryptedName.c_str(), mEncryptedName.size()); +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::ReadFromStream(IOStream &) +// Purpose: Reads the filename from a stream +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +void BackupStoreFilename::ReadFromStream(IOStream &rStream, int Timeout) +{ + // Read the header + char hdr[2]; + if(!rStream.ReadFullBuffer(hdr, 2, 0 /* not interested in bytes read if this fails */, Timeout)) + { + THROW_EXCEPTION(BackupStoreException, CouldntReadEntireStructureFromStream) + } + + // How big is it? + unsigned int dsize = BACKUPSTOREFILENAME_GET_SIZE(hdr); + + // Assume most filenames are small + char buf[256]; + if(dsize < sizeof(buf)) + { + // Fetch rest of data, relying on the Protocol to error on stupidly large sizes for us + if(!rStream.ReadFullBuffer(buf + 2, dsize - 2, 0 /* not interested in bytes read if this fails */, Timeout)) + { + THROW_EXCEPTION(BackupStoreException, CouldntReadEntireStructureFromStream) + } + // Copy in header + buf[0] = hdr[0]; buf[1] = hdr[1]; + + // assign to this string, storing the header and the extra data + mEncryptedName.assign(buf, dsize); + } + else + { + // Block of memory to hold it + MemoryBlockGuard<char*> dataB(dsize+2); + char *data = dataB; + + // Fetch rest of data, relying on the Protocol to error on stupidly large sizes for us + if(!rStream.ReadFullBuffer(data + 2, dsize - 2, 0 /* not interested in bytes read if this fails */, Timeout)) + { + THROW_EXCEPTION(BackupStoreException, CouldntReadEntireStructureFromStream) + } + // Copy in header + data[0] = hdr[0]; data[1] = hdr[1]; + + // assign to this string, storing the header and the extra data + mEncryptedName.assign(data, dsize); + } + + // Check it + CheckValid(); + + // Alert derived classes + EncodedFilenameChanged(); +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::WriteToStream(IOStream &) +// Purpose: Writes the filename to a stream +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +void BackupStoreFilename::WriteToStream(IOStream &rStream) const +{ + CheckValid(); + + rStream.Write(mEncryptedName.c_str(), mEncryptedName.size()); +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::EncodedFilenameChanged() +// Purpose: The encoded filename stored has changed +// Created: 2003/08/26 +// +// -------------------------------------------------------------------------- +void BackupStoreFilename::EncodedFilenameChanged() +{ +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::IsEncrypted() +// Purpose: Returns true if the filename is stored using an encrypting encoding +// Created: 1/12/03 +// +// -------------------------------------------------------------------------- +bool BackupStoreFilename::IsEncrypted() const +{ + return BACKUPSTOREFILENAME_GET_ENCODING(this->mEncryptedName) != + Encoding_Clear; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: BackupStoreFilename::SetAsClearFilename(const char *) +// Purpose: Sets this object to be a valid filename, but with a +// filename in the clear. Used on the server to create +// filenames when there's no way of encrypting it. +// Created: 22/4/04 +// +// -------------------------------------------------------------------------- +void BackupStoreFilename::SetAsClearFilename(const char *Clear) +{ + // Make std::string from the clear name + std::string toEncode(Clear); + + // Make an encoded string + char hdr[2]; + BACKUPSTOREFILENAME_MAKE_HDR(hdr, toEncode.size()+2, Encoding_Clear); + std::string encoded(hdr, 2); + encoded += toEncode; + ASSERT(encoded.size() == toEncode.size() + 2); + + // Store the encoded string + mEncryptedName.assign(encoded); + + // Stuff which must be done + EncodedFilenameChanged(); + CheckValid(false); +} + + + |