#include "zlib.h"

#include <stdio.h>

#ifdef STDC

# include <string.h>

# include <stdlib.h>

#ifdef USE_MMAP

# include <sys/types.h>

# include <sys/mman.h>

# include <sys/stat.h>

#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)

# include <fcntl.h>

# include <io.h>

# ifdef UNDER_CE

# include <stdlib.h>

# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)

# define SET_BINARY_MODE(file)

#ifdef _MSC_VER

# define snprintf _snprintf

#ifdef VMS

# define unlink delete

# define GZ_SUFFIX "-gz"

#ifdef RISCOS

# define unlink remove

# define GZ_SUFFIX "-gz"

# define fileno(file) file->__file

#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os

# include <unix.h> /* for fileno */

#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)

#ifndef WIN32 /* unlink already in stdio.h for WIN32 */

extern int unlink OF((const char *));

#if defined(UNDER_CE)

# include <windows.h>

# define perror(s) pwinerror(s)

static char *strwinerror (error)

DWORD error;

{

static char buf[1024];

wchar_t *msgbuf;

DWORD lasterr = GetLastError();

DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM

| FORMAT_MESSAGE_ALLOCATE_BUFFER,

NULL,

error,

0, /* Default language */

(LPVOID)&msgbuf,

0,

NULL);

if (chars != 0) {

/* If there is an \r\n appended, zap it. */

if (chars >= 2

&& msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {

chars -= 2;

msgbuf[chars] = 0;

}

if (chars > sizeof (buf) - 1) {

chars = sizeof (buf) - 1;

msgbuf[chars] = 0;

}

wcstombs(buf, msgbuf, chars + 1);

LocalFree(msgbuf);

}

else {

sprintf(buf, "unknown win32 error (%ld)", error);

}

SetLastError(lasterr);

return buf;

}

static void pwinerror (s)

const char *s;

{

if (s && *s)

fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ()));

else

fprintf(stderr, "%s\n", strwinerror(GetLastError ()));

}

#endif /* UNDER_CE */

#ifndef GZ_SUFFIX

# define GZ_SUFFIX ".gz"

#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)

#define BUFLEN 16384

#define MAX_NAME_LEN 1024

#ifdef MAXSEG_64K

# define local static

/* Needed for systems with limitation on stack size. */

# define local

#ifdef Z_SOLO

#if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE)

# include <unistd.h> /* for unlink() */

void *myalloc OF((void *, unsigned, unsigned));

void myfree OF((void *, void *));

void *myalloc(q, n, m)

void *q;

unsigned n, m;

{

q = Z_NULL;

return calloc(n, m);

}

void myfree(q, p)

void *q, *p;

{

q = Z_NULL;

free(p);

}

typedef struct gzFile_s {

} *gzFile;

gzFile gzopen OF((const char *, const char *));

gzFile gzdopen OF((int, const char *));

gzFile gz_open OF((const char *, int, const char *));

gzFile gzopen(path, mode)

const char *path;

const char *mode;

{

return gz_open(path, -1, mode);

}

gzFile gzdopen(fd, mode)

int fd;

const char *mode;

{

return gz_open(NULL, fd, mode);

}

gzFile gz_open(path, fd, mode)

const char *path;

int fd;

const char *mode;

{

gzFile gz;

int ret;

gz = malloc(sizeof(struct gzFile_s));

if (gz == NULL)

return NULL;

gz->write = strchr(mode, 'w') != NULL;

gz->strm.zalloc = myalloc;

gz->strm.zfree = myfree;

gz->strm.opaque = Z_NULL;

if (gz->write)

ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0);

else {

gz->strm.next_in = 0;

gz->strm.avail_in = Z_NULL;

ret = inflateInit2(&(gz->strm), 15 + 16);

}

if (ret != Z_OK) {

free(gz);

return NULL;

}

gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") :

fopen(path, gz->write ? "wb" : "rb");

if (gz->file == NULL) {

gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm));

free(gz);

return NULL;

}

gz->err = 0;

gz->msg = "";

return gz;

}

int gzwrite OF((gzFile, const void *, unsigned));

int gzwrite(gz, buf, len)

gzFile gz;

const void *buf;

unsigned len;

{

z_stream *strm;

unsigned char out[BUFLEN];

if (gz == NULL || !gz->write)

return 0;

strm = &(gz->strm);

strm->next_in = (void *)buf;

strm->avail_in = len;

do {

strm->next_out = out;

strm->avail_out = BUFLEN;

(void)deflate(strm, Z_NO_FLUSH);

fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);

} while (strm->avail_out == 0);

return len;

}

int gzread OF((gzFile, void *, unsigned));

int gzread(gz, buf, len)

gzFile gz;

void *buf;

unsigned len;

{

int ret;

unsigned got;

unsigned char in[1];

z_stream *strm;

if (gz == NULL || gz->write)

return 0;

if (gz->err)

return 0;

strm = &(gz->strm);

strm->next_out = (void *)buf;

strm->avail_out = len;

do {

got = fread(in, 1, 1, gz->file);

if (got == 0)

break;

strm->next_in = in;

strm->avail_in = 1;

ret = inflate(strm, Z_NO_FLUSH);

if (ret == Z_DATA_ERROR) {

gz->err = Z_DATA_ERROR;

gz->msg = strm->msg;

return 0;

}

if (ret == Z_STREAM_END)

inflateReset(strm);

} while (strm->avail_out);

return len - strm->avail_out;

}

int gzclose OF((gzFile));

int gzclose(gz)

gzFile gz;

{

z_stream *strm;

unsigned char out[BUFLEN];

if (gz == NULL)

return Z_STREAM_ERROR;

strm = &(gz->strm);

if (gz->write) {

strm->next_in = Z_NULL;

strm->avail_in = 0;

do {

strm->next_out = out;

strm->avail_out = BUFLEN;

(void)deflate(strm, Z_FINISH);

fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);

} while (strm->avail_out == 0);

deflateEnd(strm);

}

else

inflateEnd(strm);

fclose(gz->file);

free(gz);

return Z_OK;

}

const char *gzerror OF((gzFile, int *));

const char *gzerror(gz, err)

gzFile gz;

int *err;

{

*err = gz->err;

return gz->msg;

}

char *prog;

void error OF((const char *msg));

void gz_compress OF((FILE *in, gzFile out));

#ifdef USE_MMAP

int gz_compress_mmap OF((FILE *in, gzFile out));

void gz_uncompress OF((gzFile in, FILE *out));

void file_compress OF((char *file, char *mode));

void file_uncompress OF((char *file));

int main OF((int argc, char *argv[]));

void error(msg)

const char *msg;

{

fprintf(stderr, "%s: %s\n", prog, msg);

exit(1);

}

void gz_compress(in, out)

FILE *in;

gzFile out;

{

local char buf[BUFLEN];

int len;

int err;

#ifdef USE_MMAP

/* Try first compressing with mmap. If mmap fails (minigzip used in a

if (gz_compress_mmap(in, out) == Z_OK) return;

for (;;) {

len = (int)fread(buf, 1, sizeof(buf), in);

if (ferror(in)) {

perror("fread");

exit(1);

}

if (len == 0) break;

if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));

}

fclose(in);

if (gzclose(out) != Z_OK) error("failed gzclose");

}

#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */

int gz_compress_mmap(in, out)

FILE *in;

gzFile out;

{

int len;

int err;

int ifd = fileno(in);

caddr_t buf; /* mmap'ed buffer for the entire input file */

off_t buf_len; /* length of the input file */

struct stat sb;

/* Determine the size of the file, needed for mmap: */

if (fstat(ifd, &sb) < 0) return Z_ERRNO;

buf_len = sb.st_size;

if (buf_len <= 0) return Z_ERRNO;

/* Now do the actual mmap: */

buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);

if (buf == (caddr_t)(-1)) return Z_ERRNO;

/* Compress the whole file at once: */

len = gzwrite(out, (char *)buf, (unsigned)buf_len);

if (len != (int)buf_len) error(gzerror(out, &err));

munmap(buf, buf_len);

fclose(in);

if (gzclose(out) != Z_OK) error("failed gzclose");

return Z_OK;

}

#endif /* USE_MMAP */

void gz_uncompress(in, out)

gzFile in;

FILE *out;

{

local char buf[BUFLEN];

int len;

int err;

for (;;) {

len = gzread(in, buf, sizeof(buf));

if (len < 0) error (gzerror(in, &err));

if (len == 0) break;

if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {

error("failed fwrite");

}

}

if (fclose(out)) error("failed fclose");

if (gzclose(in) != Z_OK) error("failed gzclose");

}

void file_compress(file, mode)

char *file;

char *mode;

{

local char outfile[MAX_NAME_LEN];

FILE *in;

gzFile out;

if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) {

fprintf(stderr, "%s: filename too long\n", prog);

exit(1);

}

#if !defined(NO_snprintf) && !defined(NO_vsnprintf)

snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX);

strcpy(outfile, file);

strcat(outfile, GZ_SUFFIX);

in = fopen(file, "rb");

if (in == NULL) {

perror(file);

exit(1);

}

out = gzopen(outfile, mode);

if (out == NULL) {

fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);

exit(1);

}

gz_compress(in, out);

unlink(file);

}

void file_uncompress(file)

char *file;

{

local char buf[MAX_NAME_LEN];

char *infile, *outfile;

FILE *out;

gzFile in;

size_t len = strlen(file);

if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {

fprintf(stderr, "%s: filename too long\n", prog);

exit(1);

}

#if !defined(NO_snprintf) && !defined(NO_vsnprintf)

snprintf(buf, sizeof(buf), "%s", file);

strcpy(buf, file);

if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {

infile = file;

outfile = buf;

outfile[len-3] = '\0';

} else {

outfile = file;

infile = buf;

#if !defined(NO_snprintf) && !defined(NO_vsnprintf)

snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX);

strcat(infile, GZ_SUFFIX);

}

in = gzopen(infile, "rb");

if (in == NULL) {

fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);

exit(1);

}

out = fopen(outfile, "wb");

if (out == NULL) {

perror(file);

exit(1);

}

gz_uncompress(in, out);

unlink(infile);

}

int main(argc, argv)

int argc;

char *argv[];

{

int copyout = 0;

int uncompr = 0;

gzFile file;

char *bname, outmode[20];

#if !defined(NO_snprintf) && !defined(NO_vsnprintf)

snprintf(outmode, sizeof(outmode), "%s", "wb6 ");

strcpy(outmode, "wb6 ");

prog = argv[0];

bname = strrchr(argv[0], '/');

if (bname)

bname++;

else

bname = argv[0];

argc--, argv++;

if (!strcmp(bname, "gunzip"))

uncompr = 1;

else if (!strcmp(bname, "zcat"))

copyout = uncompr = 1;

while (argc > 0) {

if (strcmp(*argv, "-c") == 0)

copyout = 1;

else if (strcmp(*argv, "-d") == 0)

uncompr = 1;

else if (strcmp(*argv, "-f") == 0)

outmode[3] = 'f';

else if (strcmp(*argv, "-h") == 0)

outmode[3] = 'h';

else if (strcmp(*argv, "-r") == 0)

outmode[3] = 'R';

else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&

(*argv)[2] == 0)

outmode[2] = (*argv)[1];

else

break;

argc--, argv++;

}

if (outmode[3] == ' ')

outmode[3] = 0;

if (argc == 0) {

SET_BINARY_MODE(stdin);

SET_BINARY_MODE(stdout);

if (uncompr) {

file = gzdopen(fileno(stdin), "rb");

if (file == NULL) error("can't gzdopen stdin");

gz_uncompress(file, stdout);

} else {

file = gzdopen(fileno(stdout), outmode);

if (file == NULL) error("can't gzdopen stdout");

gz_compress(stdin, file);

}

} else {

if (copyout) {

SET_BINARY_MODE(stdout);

}

do {

if (uncompr) {

if (copyout) {

file = gzopen(*argv, "rb");

if (file == NULL)

fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);

else

gz_uncompress(file, stdout);

} else {

file_uncompress(*argv);

}

} else {

if (copyout) {

FILE * in = fopen(*argv, "rb");

if (in == NULL) {

perror(*argv);

} else {

file = gzdopen(fileno(stdout), outmode);

if (file == NULL) error("can't gzdopen stdout");

gz_compress(in, file);

}

} else {

file_compress(*argv, outmode);

}

}

} while (argv++, --argc);

}

return 0;

}