DD::Image::HashFile Namespace Reference

Includes functions to generate and check a hash for a given file. More...

Enumerations
enum	ErrorValue {   kErr_OK, kErr_FileNotFound, kErr_OpenFailed, kErr_ReadFailed,   kErr_HashNotFound, kErr_HashFound, kErr_HashMismatch, kErr_InvalidParam }
	Possible error return values. More...
enum	ExpectHash { kEH_ExpectNoHash, kEH_ExpectHash }
Functions
ErrorValue	generateHashForFile (const char *lpFileName, Hash *lpHashOut)
	Writes a hash value for the data in the given file to the pointer.
ErrorValue	checkSpecifiedHashWithFile (const char *lpFileName, Hash lExpectedHash)
ErrorValue	checkEmbeddedHashInFile (const char *lpFileName)
	Checks that the hash value stored in the given file is correct.
ErrorValue	embedHashInFile (const char *lpFileName, Hash lHash)
ErrorValue	embedHashInFile (const char *lpFileName)
const char *	getErrorMessage (ErrorValue lErrorValue)
	Returns an appropriate error string for the given error value.
ErrorValue	generateHashForOpenFile (FILE *lpFile, size_t lBytesToRead, Hash *lpHashOut, ExpectHash lExpectHash)
ErrorValue	fileContainsHash (FILE *lpFile)
Debug
These functions are only valid in debug mode, and indicate the last hashes used in various contexts. In release mode they will just return uninitialised hashes.
Hash	lastEmbeddedHash ()
Hash	lastDetectedHash ()
Hash	lastGeneratedHash ()
Variables
const size_t	kBufferSize
const U32	kHashMarker
Hash	sLastEmbeddedHash
Hash	sLastDetectedHash
Hash	sLastGeneratedHash

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Detailed Description

Includes functions to generate and check a hash for a given file.

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Enumeration Type Documentation

enum DD::Image::HashFile::ErrorValue

Possible error return values.

Enumerator:

kErr_OK	No problems.
kErr_FileNotFound	File couldn't be opened - not found.
kErr_OpenFailed	File couldn't be opened - any other error (including sharing).
kErr_ReadFailed	Couldn't read all expected data.
kErr_HashNotFound	File doesn't contain a hash value (and we expected one).
kErr_HashFound	File contains a hash value (and we didn't expect one).
kErr_HashMismatch	Hash found, but doesn't match the expected value.
kErr_InvalidParam	Parameter invalid - e. g. null pointer.

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Function Documentation

ErrorValue DD::Image::HashFile::checkSpecifiedHashWithFile	(	const char *	lpFileName,
		Hash	lExpectedHash
	)

Checks that the hash value for the data in the file matches the given value. This expects that the file does not have a hash embedded

References generateHashForFile(), kErr_HashMismatch, and kErr_OK.

ErrorValue DD::Image::HashFile::embedHashInFile	(	const char *	lpFileName,
		Hash	lHash
	)

Embeds the hash in the file, appending to it directly. It returns an error if a hash is already present

References kErr_FileNotFound, kErr_OK, kErr_OpenFailed, kErr_ReadFailed, and DD::Image::Hash::value().

Referenced by embedHashInFile().

ErrorValue DD::Image::HashFile::embedHashInFile

(

const char *

lpFileName

)

Embeds the hash in the file, appending to it directly. This version generates the hash from the file first

References embedHashInFile(), generateHashForFile(), and kErr_OK.