compress_zlib.c File Reference

Compression backend for gzip and zlib. More...

#include "orconfig.h"
#include "lib/log/log.h"
#include "lib/log/util_bug.h"
#include "lib/compress/compress.h"
#include "lib/compress/compress_zlib.h"
#include "lib/thread/threads.h"
#include <zlib.h>

Go to the source code of this file.

Data Structures
struct	tor_zlib_compress_state_t

Macros
#define	_LARGEFILE64_SOURCE   0
#define	_LFS64_LARGEFILE   0
#define	_FILE_OFFSET_BITS   0
#define	off64_t   int64_t
#define	A_FEW_KILOBYTES   2048

Functions
static size_t	tor_zlib_state_size_precalc (int inflate, int windowbits, int memlevel)
static int	memory_level (compression_level_t level)
static int	method_bits (compress_method_t method, compression_level_t level)
int	tor_zlib_method_supported (void)
const char *	tor_zlib_get_version_str (void)
const char *	tor_zlib_get_header_version_str (void)
tor_zlib_compress_state_t *	tor_zlib_compress_new (int compress_, compress_method_t method, compression_level_t compression_level)
tor_compress_output_t	tor_zlib_compress_process (tor_zlib_compress_state_t *state, char **out, size_t *out_len, const char **in, size_t *in_len, int finish)
void	tor_zlib_compress_free_ (tor_zlib_compress_state_t *state)
size_t	tor_zlib_compress_state_size (const tor_zlib_compress_state_t *state)
size_t	tor_zlib_get_total_allocation (void)
void	tor_zlib_init (void)

Variables
static atomic_counter_t	total_zlib_allocation

Detailed Description

Compression backend for gzip and zlib.

This module should never be invoked directly. Use the compress module instead.

Definition in file compress_zlib.c.

Function Documentation

memory_level()

static int memory_level ( compression_level_t  level )

static

Given level return the memory level.

Definition at line 56 of file compress_zlib.c.

method_bits()

static int method_bits ( compress_method_t  method, compression_level_t  level  )

inlinestatic

Return the 'bits' value to tell zlib to use method.

Definition at line 69 of file compress_zlib.c.

tor_zlib_compress_free_()

void tor_zlib_compress_free_

(

tor_zlib_compress_state_t *

state

)

Deallocate state.

Definition at line 269 of file compress_zlib.c.

tor_zlib_compress_new()

tor_zlib_compress_state_t* tor_zlib_compress_new	(	int	compress_,
		compress_method_t	method,
		compression_level_t	compression_level
	)

Construct and return a tor_zlib_compress_state_t object using method. If compress, it's for compression; otherwise it's for decompression.

Definition at line 158 of file compress_zlib.c.

tor_zlib_compress_process()

tor_compress_output_t tor_zlib_compress_process	(	tor_zlib_compress_state_t *	state,
		char **	out,
		size_t *	out_len,
		const char **	in,
		size_t *	in_len,
		int	finish
	)

Compress/decompress some bytes using state. Read up to *in_len bytes from *in, and write up to *out_len bytes to *out, adjusting the values as we go. If finish is true, we've reached the end of the input.

Return TOR_COMPRESS_DONE if we've finished the entire compression/decompression. Return TOR_COMPRESS_OK if we're processed everything from the input. Return TOR_COMPRESS_BUFFER_FULL if we're out of space on out. Return TOR_COMPRESS_ERROR if the stream is corrupt.

Definition at line 210 of file compress_zlib.c.

tor_zlib_compress_state_size()

size_t tor_zlib_compress_state_size

(

const tor_zlib_compress_state_t *

state

)

Return the approximate number of bytes allocated for state.

Definition at line 286 of file compress_zlib.c.

tor_zlib_get_header_version_str()

const char* tor_zlib_get_header_version_str

(

void

)

Return a string representation of the version of the version of zlib used at compilation.

Definition at line 103 of file compress_zlib.c.

tor_zlib_get_total_allocation()

size_t tor_zlib_get_total_allocation

(

void

)

Return the approximate number of bytes allocated for all zlib states.

Definition at line 294 of file compress_zlib.c.

Referenced by tor_compress_get_total_allocation().

tor_zlib_get_version_str()

const char* tor_zlib_get_version_str

(

void

)

Return a string representation of the version of the currently running version of zlib.

Definition at line 95 of file compress_zlib.c.

tor_zlib_init()

void tor_zlib_init

(

void

)

Set up global state for the zlib module

Definition at line 301 of file compress_zlib.c.

Referenced by tor_compress_init().

tor_zlib_method_supported()

int tor_zlib_method_supported

(

void

)

Return 1 if zlib/gzip compression is supported; otherwise 0.

Definition at line 84 of file compress_zlib.c.

tor_zlib_state_size_precalc()

static size_t tor_zlib_state_size_precalc ( int  inflate_, int  windowbits, int  memlevel  )

static

Return an approximate number of bytes used in RAM to hold a state with window bits windowBits and compression level 'memlevel'

Definition at line 126 of file compress_zlib.c.

Variable Documentation

total_zlib_allocation

atomic_counter_t total_zlib_allocation

static

Total number of bytes allocated for zlib state

Definition at line 52 of file compress_zlib.c.

Referenced by tor_zlib_compress_free_(), and tor_zlib_get_total_allocation().