chromium/third_party/zlib/test/minigzip.c

/* minigzip.c -- simulate gzip using the zlib compression library
 * Copyright (C) 1995-2006, 2010, 2011, 2016 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 …
#else
#define SET_BINARY_MODE(file) …
#endif

#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf …
#endif

#ifdef VMS
#define unlink …
#define GZ_SUFFIX …
#endif
#ifdef RISCOS
#define unlink …
#define GZ_SUFFIX …
#define fileno …
#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(const char *);
#endif
#endif

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

/* 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 …
#endif
#define SUFFIX_LEN …

#define BUFLEN …
#define MAX_NAME_LEN …

#ifdef MAXSEG_64K
#define local …
   /* 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

static void *myalloc(void *q, unsigned n, unsigned m) {
    (void)q;
    return calloc(n, m);
}

static void myfree(void *q, void *p) {
    (void)q;
    free(p);
}

typedef struct gzFile_s {
    FILE *file;
    int write;
    int err;
    char *msg;
    z_stream strm;
} *gzFile;

static gzFile gz_open(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;
}

static gzFile gzopen(const char *path, const char *mode) {
    return gz_open(path, -1, mode);
}

static gzFile gzdopen(int fd, const char *mode) {
    return gz_open(NULL, fd, mode);
}

static int gzwrite(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;
}

static int gzread(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;
}

static int gzclose(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;
}

static const char *gzerror(gzFile gz, int *err) {
    *err = gz->err;
    return gz->msg;
}

#endif

static char *prog;

/* ===========================================================================
 * Display error message and exit
 */
static void error(const char *msg) { … }

#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <[email protected]> */

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

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

static void gz_compress(FILE *in, gzFile out) { … }

/* ===========================================================================
 * Uncompress input to output then close both files.
 */
static void gz_uncompress(gzFile in, FILE *out) { … }


/* ===========================================================================
 * Compress the given file: create a corresponding .gz file and remove the
 * original.
 */
static void file_compress(char *file, char *mode) { … }


/* ===========================================================================
 * Uncompress the given file and remove the original.
 */
static void file_uncompress(char *file) { … }


/* ===========================================================================
 * 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(int argc, char *argv[]) { … }