14.3. Data Definitions for libz

This section defines global identifiers and their values that are associated with interfaces contained in libz. These definitions are organized into groups that correspond to system headers. This convention is used as a convenience for the reader, and does not imply the existence of these headers, or their content. Where an interface is defined as requiring a particular system header file all of the data definitions for that system header file presented here shall be in effect.

This section gives data definitions to promote binary application portability, not to repeat source interface definitions available elsewhere. System providers and application developers should use this ABI to supplement - not to replace - source interface definition specifications.

This specification uses the ISO C (1999) C Language as the reference programming language, and data definitions are specified in ISO C format. The C language is used here as a convenient notation. Using a C language description of these data objects does not preclude their use by other programming languages.

14.3.1. zlib.h

In addition to the values below, the zlib.h header shall define the ZLIB_VERSION macro. This macro may be used to check that the version of the library at run time matches that at compile time.

See also the zlibVersion() function, which returns the library version at run time. The first character of the version at compile time should always match the first character at run time.

#define Z_NULL	0
#define MAX_WBITS	15
#define MAX_MEM_LEVEL	9
#define deflateInit2(strm,level,method,windowBits,memLevel,strategy)	\
#define deflateInit(strm,level)	\
	deflateInit_((strm), (level),       ZLIB_VERSION, sizeof(z_stream))
#define inflateInit2(strm,windowBits)	\
	inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
#define inflateInit(strm)	\
	inflateInit_((strm),                ZLIB_VERSION, sizeof(z_stream))

typedef char charf;
typedef int intf;

typedef void *voidpf;
typedef unsigned int uInt;
typedef unsigned long int uLong;
typedef uLong uLongf;
typedef void *voidp;
typedef unsigned char Byte;
typedef off_t z_off_t;
typedef void *const voidpc;

typedef voidpf(*alloc_func) (voidpf opaque, uInt items, uInt size);
typedef void (*free_func) (voidpf opaque, voidpf address);
struct internal_state {
    int dummy;
typedef Byte Bytef;
typedef uInt uIntf;

typedef struct z_stream_s {
    Bytef *next_in;
    uInt avail_in;
    uLong total_in;
    Bytef *next_out;
    uInt avail_out;
    uLong total_out;
    char *msg;
    struct internal_state *state;
    alloc_func zalloc;
    free_func zfree;
    voidpf opaque;
    int data_type;
    uLong adler;
    uLong reserved;
} z_stream;

typedef z_stream *z_streamp;
typedef voidp gzFile;

#define Z_NO_FLUSH	0
#define Z_SYNC_FLUSH	2
#define Z_FULL_FLUSH	3
#define Z_FINISH	4
#define Z_BLOCK	5

#define Z_ERRNO	(-1)
#define Z_STREAM_ERROR	(-2)
#define Z_DATA_ERROR	(-3)
#define Z_MEM_ERROR	(-4)
#define Z_BUF_ERROR	(-5)
#define Z_VERSION_ERROR	(-6)
#define Z_OK	0
#define Z_STREAM_END	1
#define Z_NEED_DICT	2

#define Z_BEST_SPEED	1

#define Z_FILTERED	1
#define Z_HUFFMAN_ONLY	2

#define Z_BINARY	0
#define Z_ASCII	1
#define Z_UNKNOWN	2

#define Z_DEFLATED	8

extern int gzread(gzFile, voidp, unsigned int);
extern int gzclose(gzFile);
extern gzFile gzopen(const char *, const char *);
extern gzFile gzdopen(int, const char *);
extern int gzwrite(gzFile, voidpc, unsigned int);
extern int gzflush(gzFile, int);
extern const char *gzerror(gzFile, int *);
extern uLong adler32(uLong, const Bytef *, uInt);
extern int compress(Bytef *, uLongf *, const Bytef *, uLong);
extern int compress2(Bytef *, uLongf *, const Bytef *, uLong, int);
extern uLong crc32(uLong, const Bytef *, uInt);
extern int deflate(z_streamp, int);
extern int deflateCopy(z_streamp, z_streamp);
extern int deflateEnd(z_streamp);
extern int deflateInit2_(z_streamp, int, int, int, int, int, const char *,
extern int deflateInit_(z_streamp, int, const char *, int);
extern int deflateParams(z_streamp, int, int);
extern int deflateReset(z_streamp);
extern int deflateSetDictionary(z_streamp, const Bytef *, uInt);
extern const uLongf *get_crc_table(void);
extern int gzeof(gzFile);
extern int gzgetc(gzFile);
extern char *gzgets(gzFile, char *, int);
extern int gzprintf(gzFile, const char *, ...);
extern int gzputc(gzFile, int);
extern int gzputs(gzFile, const char *);
extern int gzrewind(gzFile);
extern z_off_t gzseek(gzFile, z_off_t, int);
extern int gzsetparams(gzFile, int, int);
extern z_off_t gztell(gzFile);
extern int inflate(z_streamp, int);
extern int inflateEnd(z_streamp);
extern int inflateInit2_(z_streamp, int, const char *, int);
extern int inflateInit_(z_streamp, const char *, int);
extern int inflateReset(z_streamp);
extern int inflateSetDictionary(z_streamp, const Bytef *, uInt);
extern int inflateSync(z_streamp);
extern int inflateSyncPoint(z_streamp);
extern int uncompress(Bytef *, uLongf *, const Bytef *, uLong);
extern const char *zError(int);
extern const char *zlibVersion(void);
extern uLong deflateBound(z_streamp, uLong);
extern uLong compressBound(uLong);