zlib internal header definitions for gz* operations More...

#include <stdio.h>
#include <zlib/zlib.h>
#include <fcntl.h>
#include <errno.h>

Data Structures
struct	gz_state
	internal gzip file state data structure More...

Macros
#define	ZLIB_INTERNAL

#define	_POSIX_SOURCE

#define	local static

#define	zstrerror() strerror(errno)

#define	DEF_MEM_LEVEL 8

#define	GZBUFSIZE 8192

#define	GZ_NONE 0

#define	GZ_READ 7247

#define	GZ_WRITE 31153

#define	GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */

#define	LOOK 0 /* look for a gzip header */

#define	COPY 1 /* copy input directly */

#define	GZIP 2 /* decompress a gzip stream */

#define	GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())

Typedefs
typedef gz_state FAR *	gz_statep

Functions
voidp	malloc (uInt size)

void	free (voidpf ptr)

ZEXTERN gzFile ZEXPORT	gzopen64 (const char , const char )

ZEXTERN z_off64_t ZEXPORT	gzseek64 (gzFile, z_off64_t, int)
	Set the starting position to offset relative to whence for the next gzread or gzwrite on file.

ZEXTERN z_off64_t ZEXPORT	gztell64 (gzFile)
	Return the starting position for the next gzread or gzwrite on file.

ZEXTERN z_off64_t ZEXPORT	gzoffset64 (gzFile)
	Return the current compressed (actual) read or write offset of file.

void ZLIB_INTERNAL	gz_error (gz_statep, int, const char *)
	Create an error message in allocated memory and set state->err and state->msg accordingly.

unsigned ZLIB_INTERNAL	gz_intmax (void)

Detailed Description

zlib internal header definitions for gz* operations

Function Documentation

◆ gz_error()

void ZLIB_INTERNAL gz_error	(	gz_statep	state,
		int	err,
		const char *	msg
	)

Create an error message in allocated memory and set state->err and state->msg accordingly.

Free any previous error message already there. Do not try to free or allocate space if the error is Z_MEM_ERROR (out of memory). Simply save the error message as a static string. If there is an allocation failure constructing the error message, then convert the error to out of memory.

◆ gzoffset64()

ZEXTERN z_off64_t ZEXPORT gzoffset64 ( gzFile file )

Return the current compressed (actual) read or write offset of file.

This offset includes the count of bytes that precede the gzip stream, for example when appending or when using gzdopen() for reading. When reading, the offset does not include as yet unused buffered input. This information can be used for a progress indicator. On error, gzoffset64() returns -1.

◆ gzseek64()

ZEXTERN z_off64_t ZEXPORT gzseek64	(	gzFile	file,
		z_off64_t	offset,
		int	whence
	)

Set the starting position to offset relative to whence for the next gzread or gzwrite on file.

The offset represents a number of bytes in the uncompressed data stream. The whence parameter is defined as in lseek(2); the value SEEK_END is not supported.

If the file is opened for reading, this function is emulated but can be extremely slow. If the file is opened for writing, only forward seeks are supported; gzseek64 then compresses a sequence of zeroes up to the new starting position.

Returns: the resulting offset location as measured in bytes from the beginning of the uncompressed stream, or -1 in case of error, in particular if the file is opened for writing and the new starting position would be before the current position.

◆ gztell64()

ZEXTERN z_off64_t ZEXPORT gztell64 ( gzFile file )

Return the starting position for the next gzread or gzwrite on file.

This position represents a number of bytes in the uncompressed data stream, and is zero when starting, even if appending or reading a gzip stream from the middle of a file using gzdopen().

gztell64(file) is equivalent to gzseek64(file, 0L, SEEK_CUR)

Data Structures

Macros