checksum.c File Reference

Code to compute a three part checksum: SHA1.MD5.Size. More...

#include <gcrypt.h>
#include "checksum.h"

Include dependency graph for checksum.c:

Go to the source code of this file.

Functions
CksumFile *	SumOpenFile (char *Fname)
	Open and mmap a file. More...
void	SumCloseFile (CksumFile *CF)
	Close a file that was opened with SumOpenFile() More...
int	CountDigits (uint64_t Num)
	Count how many digits are in a number. More...
Cksum *	SumComputeFile (FILE *Fin)
	Compute the checksum, allocate and return a string containing the sum value. More...
Cksum *	SumComputeBuff (CksumFile *CF)
	Compute the checksum, allocate and return a Cksum containing the sum value. More...
char *	SumToString (Cksum *Sum)
	Return string representing a Cksum. NOTE: The calling function must free() the string! More...
int	calc_sha256sum (char *filename, char *dst)

Detailed Description

Code to compute a three part checksum: SHA1.MD5.Size.

• SHA1 = SHA1 of the file.
• MD5 = MD5 value of the file.
• Size = number of bytes in the file. The chances of two files having the same size, same MD5, and same SHA1 is extremely unlikely.

Definition in file checksum.c.

Function Documentation

CountDigits()

int CountDigits

(

uint64_t

Num

)

Count how many digits are in a number.

Parameters

Num

Number

Returns

number of digits

Definition at line 97 of file checksum.c.

SumCloseFile()

void SumCloseFile

(

CksumFile *

CF

)

Close a file that was opened with SumOpenFile()

Parameters

CF	CksumFile ptr

Definition at line 83 of file checksum.c.

SumComputeBuff()

Cksum* SumComputeBuff

(

CksumFile *

CF

)

Compute the checksum, allocate and return a Cksum containing the sum value.

Note

The calling function must free() the returned Cksum!

Parameters

CF	CksumFile ptr

Returns

Cksum or NULL on error.

Definition at line 182 of file checksum.c.

SumComputeFile()

Cksum* SumComputeFile

(

FILE *

Fin

)

Compute the checksum, allocate and return a string containing the sum value.

Note

The calling function must free() the string!

Parameters

Fin	Open file descriptor

Returns

NULL on error.

Definition at line 115 of file checksum.c.

SumOpenFile()

CksumFile* SumOpenFile

(

char *

Fname

)

Open and mmap a file.

Parameters

Fname

File pathname

Returns

CksmFile ptr, or NULL on failure.

Definition at line 26 of file checksum.c.

SumToString()

char* SumToString

(

Cksum *

Sum

)

Return string representing a Cksum. NOTE: The calling function must free() the string!

Parameters

Sum

Cksum ptr

Returns

"sha1.md5.size" string, or NULL on error.

Definition at line 237 of file checksum.c.