/* minigzip.c -- simulate gzip using the zlib compression library
 * Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/*
 * minigzip is a minimal implementation of the gzip utility. This is
 * only an example of using zlib and isn't meant to replace the
 * full-featured gzip. No attempt is made to deal with file systems
 * limiting names to 14 or 8+3 characters, etc... Error checking is
 * very limited. So use minigzip only for testing; use gzip for the
 * real thing. On MSDOS, use only on file names without extension
 * or in pipe mode.
 */

/* @(#) $Id$ */

#include "zlib.h"
#include <stdio.h>

#ifdef STDC
#  include <string.h>
#  include <stdlib.h>
#endif

#ifdef USE_MMAP
#  include <sys/types.h>
#  include <sys/mman.h>
#  include <sys/stat.h>
#endif

#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
#  include <fcntl.h>
#  include <io.h>
#  ifdef UNDER_CE
#    include <stdlib.h>
#  endif
#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
#  define SET_BINARY_MODE(file)
#endif

#ifdef VMS
#  define unlink delete
#  define GZ_SUFFIX "-gz"
#endif
#ifdef RISCOS
#  define unlink remove
#  define GZ_SUFFIX "-gz"
#  define fileno(file) file->__file
#endif
#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
#  include <unix.h> /* for fileno */
#endif

#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)
#ifndef WIN32 /* unlink already in stdio.h for WIN32 */
extern int unlink OF((const char*));
#endif
#endif

#if defined(UNDER_CE)
#  include <windows.h>
#  define perror(s) pwinerror(s)

/* Map the Windows error number in ERROR to a locale-dependent error
   message string and return a pointer to it.  Typically, the values
   for ERROR come from GetLastError.

   The string pointed to shall not be modified by the application,
   but may be overwritten by a subsequent call to strwinerror

   The strwinerror function does not change the current setting
   of GetLastError.  */

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"
#endif
#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. */
#else
#  define local
#endif

#ifdef Z_SOLO
/* for Z_SOLO, create simplified gz* functions using deflate and inflate */

#if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE)
#  include <unistd.h>       /* for unlink() */
#endif

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
{
    FILE* file;
    int write;
    int err;
    char* msg;
    z_stream strm;
}* 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;
}

#endif

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));
#endif
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[]));

/* ===========================================================================
 * Display error message and exit
 */
void error(msg)
const char* msg;
{
    fprintf(stderr, "%s: %s\n", prog, msg);
    exit(1);
}

/* ===========================================================================
 * Compress input to output then close both files.
 */

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
     * pipe), use the normal fread loop.
     */
    if (gz_compress_mmap(in, out) == Z_OK) return;

#endif

    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> */

/* Try compressing the input file at once using mmap. Return Z_OK if
 * if success, Z_ERRNO otherwise.
 */
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 */

/* ===========================================================================
 * Uncompress input to output then close both files.
 */
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");
}


/* ===========================================================================
 * Compress the given file: create a corresponding .gz file and remove the
 * original.
 */
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);
    }

    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);
}


/* ===========================================================================
 * Uncompress the given file and remove the original.
 */
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);
    }

    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;
        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);
}


/* ===========================================================================
 * Usage:  minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...]
 *   -c : write to standard output
 *   -d : decompress
 *   -f : compress with Z_FILTERED
 *   -h : compress with Z_HUFFMAN_ONLY
 *   -r : compress with Z_RLE
 *   -1 to -9 : compression level
 */

int main(argc, argv)
int argc;
char* argv[];
{
    int copyout = 0;
    int uncompr = 0;
    gzFile file;
    char* bname, outmode[20];

    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;
}