Hash and Compression

Data hashing, integrity and generic compression. More...

Collaboration diagram for Hash and Compression:

Macros
#define	GF_SHA1_DIGEST_SIZE   20

Functions
u32	gf_crc_32 (const u8 *data, u32 size)
	CRC32 compute.
GF_Err	gf_gz_compress_payload (u8 **data, u32 data_len, u32 *out_size)
GF_Err	gf_gz_compress_payload_ex (u8 **data, u32 data_len, u32 *out_size, u8 data_offset, Bool skip_if_larger, u8 **out_comp_data, Bool use_gz)
GF_Err	gf_gz_decompress_payload (u8 *data, u32 data_len, u8 **uncompressed_data, u32 *out_size)
GF_Err	gf_gz_decompress_payload_ex (u8 *data, u32 data_len, u8 **uncompressed_data, u32 *out_size, Bool use_gz)
GF_Err	gf_lz_compress_payload (u8 **data, u32 data_len, u32 *out_size)
GF_Err	gf_lz_decompress_payload (u8 *data, u32 data_len, u8 **uncompressed_data, u32 *out_size)
u64	gf_gzseek (void *file, u64 offset, int whence)
u64	gf_gztell (void *file)
s64	gf_gzrewind (void *file)
int	gf_gzeof (void *file)
int	gf_gzclose (void *file)
const char *	gf_gzerror (void *file, int *errnum)
void	gf_gzclearerr (void *file)
void *	gf_gzopen (const char *path, const char *mode)
int	gf_gzread (void *file, void *buf, unsigned len)
int	gf_gzdirect (void *file)
int	gf_gzgetc (void *file)
char *	gf_gzgets (void *file, char *buf, int len)
GF_SHA1Context *	gf_sha1_starts ()
void	gf_sha1_update (GF_SHA1Context *ctx, u8 *input, u32 length)
void	gf_sha1_finish (GF_SHA1Context *ctx, u8 digest[GF_SHA1_DIGEST_SIZE])
GF_Err	gf_sha1_file (const char *filename, u8 digest[GF_SHA1_DIGEST_SIZE])
GF_Err	gf_sha1_file_ptr (FILE *file, u8 digest[GF_SHA1_DIGEST_SIZE])
void	gf_sha1_csum (u8 *buf, u32 buflen, u8 digest[GF_SHA1_DIGEST_SIZE])

Detailed Description

Data hashing, integrity and generic compression.

This section documents misc data functions such as integrity and parsing such as SHA-1 hashing CRC checksum, 128 bit ID parsing...

Macro Definition Documentation

GF_SHA1_DIGEST_SIZE

#define GF_SHA1_DIGEST_SIZE   20

SHA1 message size

Function Documentation

gf_crc_32()

u32 gf_crc_32	(	const u8 *	data,
		u32	size
	)

CRC32 compute.

Computes the CRC32 value of a buffer.

Parameters

data	buffer
size	buffer size

Returns

computed CRC32

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gf_gz_compress_payload()

GF_Err gf_gz_compress_payload	(	u8 **	data,
		u32	data_len,
		u32 *	out_size
	)

Compresses a data buffer in place using zlib/deflate. Buffer may be reallocated in the process.

Parameters

data	pointer to the data buffer to be compressed
data_len	length of the data buffer to be compressed
out_size	pointer for output buffer size

Returns

error if any

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gf_gz_compress_payload_ex()

GF_Err gf_gz_compress_payload_ex	(	u8 **	data,
		u32	data_len,
		u32 *	out_size,
		u8	data_offset,
		Bool	skip_if_larger,
		u8 **	out_comp_data,
		Bool	use_gz
	)

Compresses a data buffer in place using zlib/deflate. Buffer may be reallocated in the process.

Parameters

data	pointer to the data buffer to be compressed
data_len	length of the data buffer to be compressed
out_size	pointer for output buffer size
data_offset	offset in source buffer - the input payload size is data_len - data_offset
skip_if_larger	if GF_TRUE, will not override source buffer if compressed version is larger than input data
out_comp_data	if not NULL, the compressed result is set in this pointer rather than doing inplace compression
use_gz	if true, GZ header is present

Returns

error if any

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gf_gz_decompress_payload()

GF_Err gf_gz_decompress_payload	(	u8 *	data,
		u32	data_len,
		u8 **	uncompressed_data,
		u32 *	out_size
	)

Decompresses a data buffer using zlib/inflate.

Parameters

data	data buffer to be decompressed
data_len	length of the data buffer to be decompressed
uncompressed_data	pointer to the uncompressed data buffer. The resulting buffer is NULL-terminated. It is the responsibility of the caller to free this buffer.
out_size	size of the uncompressed buffer

Returns

error if any

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gf_gz_decompress_payload_ex()

GF_Err gf_gz_decompress_payload_ex	(	u8 *	data,
		u32	data_len,
		u8 **	uncompressed_data,
		u32 *	out_size,
		Bool	use_gz
	)

Decompresses a data buffer using zlib/inflate.

Parameters

data	data buffer to be decompressed
data_len	length of the data buffer to be decompressed
uncompressed_data	pointer to the uncompressed data buffer. The resulting buffer is NULL-terminated. It is the responsibility of the caller to free this buffer.
out_size	size of the uncompressed buffer
use_gz	if true, gz header is present

Returns

error if any

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gf_lz_compress_payload()

GF_Err gf_lz_compress_payload	(	u8 **	data,
		u32	data_len,
		u32 *	out_size
	)

Compresses a data buffer in place using LZMA. Buffer may be reallocated in the process.

Parameters

data	pointer to the data buffer to be compressed
data_len	length of the data buffer to be compressed
out_size	pointer for output buffer size

Returns

error if any

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gf_lz_decompress_payload()

GF_Err gf_lz_decompress_payload	(	u8 *	data,
		u32	data_len,
		u8 **	uncompressed_data,
		u32 *	out_size
	)

Decompresses a data buffer using LZMA.

Parameters

data	data buffer to be decompressed
data_len	length of the data buffer to be decompressed
uncompressed_data	pointer to the uncompressed data buffer. It is the responsibility of the caller to free this buffer.
out_size	size of the uncompressed buffer

Returns

error if any

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gf_gzseek()

u64 gf_gzseek	(	void *	file,
		u64	offset,
		int	whence
	)

Wrapper around gzseek, same parameters

Parameters

file	target gzfile
offset	offset in file
whence	same as gzseek

Returns

same as gzseek

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gf_gztell()

u64 gf_gztell

(

void *

file

)

Wrapper around gf_gztell, same parameters

Parameters

file	target gzfile

Returns

postion in file

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gf_gzrewind()

s64 gf_gzrewind

(

void *

file

)

Wrapper around gzrewind, same parameters

Parameters

file	target gzfile

Returns

same as gzrewind

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gf_gzeof()

int gf_gzeof

(

void *

file

)

Wrapper around gzeof, same parameters

Parameters

file	target gzfile

Returns

same as gzeof

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gf_gzclose()

int gf_gzclose

(

void *

file

)

Wrapper around gzclose, same parameters

Parameters

file	target gzfile

Returns

same as gzclose

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gf_gzerror()

const char * gf_gzerror	(	void *	file,
		int *	errnum
	)

Wrapper around gzerror, same parameters

Parameters

file	target gzfile
errnum	same as gzerror

Returns

same as gzerror

gf_gzclearerr()

void gf_gzclearerr

(

void *

file

)

Wrapper around gzclearerr, same parameters

Parameters

file	target gzfile

gf_gzopen()

void * gf_gzopen	(	const char *	path,
		const char *	mode
	)

Wrapper around gzopen, same parameters

Parameters

path	the file name to open
mode	the file open mode

Returns

open file

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gf_gzread()

int gf_gzread	(	void *	file,
		void *	buf,
		unsigned	len
	)

Wrapper around gzread, same parameters

Parameters

file	target gzfile
buf	same as gzread
len	same as gzread

Returns

same as gzread

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gf_gzdirect()

int gf_gzdirect

(

void *

file

)

Wrapper around gzdirect, same parameters

Parameters

file	target gzfile

Returns

same as gzdirect

gf_gzgetc()

int gf_gzgetc

(

void *

file

)

Wrapper around gzgetc, same parameters

Parameters

file	target gzfile

Returns

same as gzgetc

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gf_gzgets()

char * gf_gzgets	(	void *	file,
		char *	buf,
		int	len
	)

Wrapper around gzgets, same parameters

Parameters

file	target gzfile
buf	same as gzread
len	same as gzread

Returns

same as gzgets

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gf_sha1_starts()

GF_SHA1Context * gf_sha1_starts

(

)

create SHA-1 context

Returns

the SHA1 context

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gf_sha1_update()

void gf_sha1_update	(	GF_SHA1Context *	ctx,
		u8 *	input,
		u32	length
	)

adds byte to the SHA-1 context

Parameters

ctx	the target SHA1 context
input	data to hash
length	size of data in bytes

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gf_sha1_finish()

void gf_sha1_finish	(	GF_SHA1Context *	ctx,
		u8	digest[GF_SHA1_DIGEST_SIZE]
	)

generates SHA-1 of all bytes ingested

Parameters

ctx	the target SHA1 context
digest	buffer to store message digest

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gf_sha1_file()

GF_Err gf_sha1_file	(	const char *	filename,
		u8	digest[GF_SHA1_DIGEST_SIZE]
	)

gets SHA1 message digest of a file

Parameters

filename	name of file to hash
digest	buffer to store message digest

Returns

error if any

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gf_sha1_file_ptr()

GF_Err gf_sha1_file_ptr	(	FILE *	file,
		u8	digest[GF_SHA1_DIGEST_SIZE]
	)

gets SHA1 message digest of a opened file

Parameters

file	handle to open file
digest	buffer to store message digest

Returns

error if any

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gf_sha1_csum()

void gf_sha1_csum	(	u8 *	buf,
		u32	buflen,
		u8	digest[GF_SHA1_DIGEST_SIZE]
	)

gets SHA-1 of input buffer

Parameters

buf	input buffer to hash
buflen	size of input buffer in bytes
digest	buffer to store message digest

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