/* gzwrite.c -- zlib functions for writing gzip files

 * Copyright (C) 2004, 2005, 2010, 2011, 2012 Mark Adler

 * For conditions of distribution and use, see copyright notice in zlib.h

 */

#include "gzguts.h"

/* Local functions */

local int gz_init OF((gz_statep));

local int gz_comp OF((gz_statep, int));

local int gz_zero OF((gz_statep, z_off64_t));

/* Initialize state for writing a gzip file.  Mark initialization by setting

   state->size to non-zero.  Return -1 on failure or 0 on success. */

local int gz_init(state)

    gz_statep state;

{

    int ret;

    z_streamp strm = &(state->strm);

    /* allocate input buffer */

    state->in = malloc(state->want);

    if (state->in == NULL) {

        gz_error(state, Z_MEM_ERROR, "out of memory");

        return -1;

    }

    /* only need output buffer and deflate state if compressing */

    if (!state->direct) {

        /* allocate output buffer */

        state->out = malloc(state->want);

        if (state->out == NULL) {

            free(state->in);

            gz_error(state, Z_MEM_ERROR, "out of memory");

            return -1;

        }

        /* allocate deflate memory, set up for gzip compression */

        strm->zalloc = Z_NULL;

        strm->zfree = Z_NULL;

        strm->opaque = Z_NULL;

        ret = deflateInit2(strm, state->level, Z_DEFLATED,

                           MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);

        if (ret != Z_OK) {

            free(state->out);

            free(state->in);

            gz_error(state, Z_MEM_ERROR, "out of memory");

            return -1;

        }

    }

    /* mark state as initialized */

    state->size = state->want;

    /* initialize write buffer if compressing */

    if (!state->direct) {

        strm->avail_out = state->size;

        strm->next_out = state->out;

        state->x.next = strm->next_out;

    }

    return 0;

}

/* Compress whatever is at avail_in and next_in and write to the output file.

   Return -1 if there is an error writing to the output file, otherwise 0.

   flush is assumed to be a valid deflate() flush value.  If flush is Z_FINISH,

   then the deflate() state is reset to start a new gzip stream.  If gz->direct

   is true, then simply write to the output file without compressing, and

   ignore flush. */

local int gz_comp(state, flush)

    gz_statep state;

    int flush;

{

    int ret, got;

    unsigned have;

    z_streamp strm = &(state->strm);

    /* allocate memory if this is the first time through */

    if (state->size == 0 && gz_init(state) == -1)

        return -1;

    /* write directly if requested */

    if (state->direct) {

        got = write(state->fd, strm->next_in, strm->avail_in);

        if (got < 0 || (unsigned)got != strm->avail_in) {

            gz_error(state, Z_ERRNO, zstrerror());

            return -1;

        }

        strm->avail_in = 0;

        return 0;

    }

    /* run deflate() on provided input until it produces no more output */

    ret = Z_OK;

    do {

        /* write out current buffer contents if full, or if flushing, but if

           doing Z_FINISH then don't write until we get to Z_STREAM_END */

        if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&

            (flush != Z_FINISH || ret == Z_STREAM_END))) {

            have = (unsigned)(strm->next_out - state->x.next);

            if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||

                         (unsigned)got != have)) {

                gz_error(state, Z_ERRNO, zstrerror());

                return -1;

            }

            if (strm->avail_out == 0) {

                strm->avail_out = state->size;

                strm->next_out = state->out;

            }

            state->x.next = strm->next_out;

        }

        /* compress */

        have = strm->avail_out;

        ret = deflate(strm, flush);

        if (ret == Z_STREAM_ERROR) {

            gz_error(state, Z_STREAM_ERROR,

                      "internal error: deflate stream corrupt");

            return -1;

        }

        have -= strm->avail_out;

    } while (have);

    /* if that completed a deflate stream, allow another to start */

    if (flush == Z_FINISH)

        deflateReset(strm);

    /* all done, no errors */

    return 0;

}

/* Compress len zeros to output.  Return -1 on error, 0 on success. */

local int gz_zero(state, len)

    gz_statep state;

    z_off64_t len;

{

    int first;

    unsigned n;

    z_streamp strm = &(state->strm);

    /* consume whatever's left in the input buffer */

    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)

        return -1;

    /* compress len zeros (len guaranteed > 0) */

    first = 1;

    while (len) {

        n = GT_OFF(state->size) || (z_off64_t)state->size > len ?

            (unsigned)len : state->size;

        if (first) {

            memset(state->in, 0, n);

            first = 0;

        }

        strm->avail_in = n;

        strm->next_in = state->in;

        state->x.pos += n;

        if (gz_comp(state, Z_NO_FLUSH) == -1)

            return -1;

        len -= n;

    }

    return 0;

}

/* -- see zlib.h -- */

int ZEXPORT gzwrite(file, buf, len)

    gzFile file;

    voidpc buf;

    unsigned len;

{

    unsigned put = len;

    unsigned n;

    gz_statep state;

    z_streamp strm;

    /* get internal structure */

    if (file == NULL)

        return 0;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return 0;

    /* since an int is returned, make sure len fits in one, otherwise return

       with an error (this avoids the flaw in the interface) */

    if ((int)len < 0) {

        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");

        return 0;

    }

    /* if len is zero, avoid unnecessary operations */

    if (len == 0)

        return 0;

    /* allocate memory if this is the first time through */

    if (state->size == 0 && gz_init(state) == -1)

        return 0;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return 0;

    }

    /* for small len, copy to input buffer, otherwise compress directly */

    if (len < state->size) {

        /* copy to input buffer, compress when full */

        do {

            if (strm->avail_in == 0)

                strm->next_in = state->in;

            n = state->size - strm->avail_in;

            if (n > len)

                n = len;

            memcpy(strm->next_in + strm->avail_in, buf, n);

            strm->avail_in += n;

            state->x.pos += n;

            buf = (char *)buf + n;

            len -= n;

            if (len && gz_comp(state, Z_NO_FLUSH) == -1)

                return 0;

        } while (len);

    }

    else {

        /* consume whatever's left in the input buffer */

        if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)

            return 0;

        /* directly compress user buffer to file */

        strm->avail_in = len;

        strm->next_in = (voidp)buf;

        state->x.pos += len;

        if (gz_comp(state, Z_NO_FLUSH) == -1)

            return 0;

    }

    /* input was all buffered or compressed (put will fit in int) */

    return (int)put;

}

/* -- see zlib.h -- */

int ZEXPORT gzputc(file, c)

    gzFile file;

    int c;

{

    unsigned char buf[1];

    gz_statep state;

    z_streamp strm;

    /* get internal structure */

    if (file == NULL)

        return -1;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return -1;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return -1;

    }

    /* try writing to input buffer for speed (state->size == 0 if buffer not

       initialized) */

    if (strm->avail_in < state->size) {

        if (strm->avail_in == 0)

            strm->next_in = state->in;

        strm->next_in[strm->avail_in++] = c;

        state->x.pos++;

        return c & 0xff;

    }

    /* no room in buffer or not initialized, use gz_write() */

    buf[0] = c;

    if (gzwrite(file, buf, 1) != 1)

        return -1;

    return c & 0xff;

}

/* -- see zlib.h -- */

int ZEXPORT gzputs(file, str)

    gzFile file;

    const char *str;

{

    int ret;

    unsigned len;

    /* write string */

    len = (unsigned)strlen(str);

    ret = gzwrite(file, str, len);

    return ret == 0 && len != 0 ? -1 : ret;

}

#if defined(STDC) || defined(Z_HAVE_STDARG_H)

#include <stdarg.h></stdarg.h>

/* -- see zlib.h -- */

int ZEXPORTVA gzprintf (gzFile file, const char *format, ...)

{

    int size, len;

    gz_statep state;

    z_streamp strm;

    va_list va;

    /* get internal structure */

    if (file == NULL)

        return -1;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return 0;

    /* make sure we have some buffer space */

    if (state->size == 0 && gz_init(state) == -1)

        return 0;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return 0;

    }

    /* consume whatever's left in the input buffer */

    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)

        return 0;

    /* do the printf() into the input buffer, put length in len */

    size = (int)(state->size);

    state->in[size - 1] = 0;

    va_start(va, format);

#ifdef NO_vsnprintf

#  ifdef HAS_vsprintf_void

    (void)vsprintf((char *)(state->in), format, va);

    va_end(va);

    for (len = 0; len < size; len++)

        if (state->in[len] == 0) break;

#  else

    len = vsprintf((char *)(state->in), format, va);

    va_end(va);

#  endif

#else

#  ifdef HAS_vsnprintf_void

    (void)vsnprintf((char *)(state->in), size, format, va);

    va_end(va);

    len = strlen((char *)(state->in));

#  else

    len = vsnprintf((char *)(state->in), size, format, va);

    va_end(va);

#  endif

#endif

    /* check that printf() results fit in buffer */

    if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)

        return 0;

    /* update buffer and position, defer compression until needed */

    strm->avail_in = (unsigned)len;

    strm->next_in = state->in;

    state->x.pos += len;

    return len;

}

#else /* !STDC && !Z_HAVE_STDARG_H */

/* -- see zlib.h -- */

int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,

                       a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)

    gzFile file;

    const char *format;

    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,

        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;

{

    int size, len;

    gz_statep state;

    z_streamp strm;

    /* get internal structure */

    if (file == NULL)

        return -1;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that can really pass pointer in ints */

    if (sizeof(int) != sizeof(void *))

        return 0;

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return 0;

    /* make sure we have some buffer space */

    if (state->size == 0 && gz_init(state) == -1)

        return 0;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return 0;

    }

    /* consume whatever's left in the input buffer */

    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)

        return 0;

    /* do the printf() into the input buffer, put length in len */

    size = (int)(state->size);

    state->in[size - 1] = 0;

#ifdef NO_snprintf

#  ifdef HAS_sprintf_void

    sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,

            a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);

    for (len = 0; len < size; len++)

        if (state->in[len] == 0) break;

#  else

    len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,

                  a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);

#  endif

#else

#  ifdef HAS_snprintf_void

    snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,

             a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);

    len = strlen((char *)(state->in));

#  else

    len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,

                   a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,

                   a19, a20);

#  endif

#endif

    /* check that printf() results fit in buffer */

    if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)

        return 0;

    /* update buffer and position, defer compression until needed */

    strm->avail_in = (unsigned)len;

    strm->next_in = state->in;

    state->x.pos += len;

    return len;

}

#endif

/* -- see zlib.h -- */

int ZEXPORT gzflush(file, flush)

    gzFile file;

    int flush;

{

    gz_statep state;

    /* get internal structure */

    if (file == NULL)

        return -1;

    state = (gz_statep)file;

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return Z_STREAM_ERROR;

    /* check flush parameter */

    if (flush < 0 || flush > Z_FINISH)

        return Z_STREAM_ERROR;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return -1;

    }

    /* compress remaining data with requested flush */

    gz_comp(state, flush);

    return state->err;

}

/* -- see zlib.h -- */

int ZEXPORT gzsetparams(file, level, strategy)

    gzFile file;

    int level;

    int strategy;

{

    gz_statep state;

    z_streamp strm;

    /* get internal structure */

    if (file == NULL)

        return Z_STREAM_ERROR;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return Z_STREAM_ERROR;

    /* if no change is requested, then do nothing */

    if (level == state->level && strategy == state->strategy)

        return Z_OK;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return -1;

    }

    /* change compression parameters for subsequent input */

    if (state->size) {

        /* flush previous input with previous parameters before changing */

        if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)

            return state->err;

        deflateParams(strm, level, strategy);

    }

    state->level = level;

    state->strategy = strategy;

    return Z_OK;

}

/* -- see zlib.h -- */

int ZEXPORT gzclose_w(file)

    gzFile file;

{

    int ret = Z_OK;

    gz_statep state;

    /* get internal structure */

    if (file == NULL)

        return Z_STREAM_ERROR;

    state = (gz_statep)file;

    /* check that we're writing */

    if (state->mode != GZ_WRITE)

        return Z_STREAM_ERROR;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            ret = state->err;

    }

    /* flush, free memory, and close file */

    if (state->size) {

        if (gz_comp(state, Z_FINISH) == -1)

            ret = state->err;

        if (!state->direct) {

            (void)deflateEnd(&(state->strm));

            free(state->out);

        }

        free(state->in);

    }

    gz_error(state, Z_OK, NULL);

    free(state->path);

    if (close(state->fd) == -1)

        ret = Z_ERRNO;

    free(state);

    return ret;

}