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

  * Copyright (C) 2004, 2005, 2010 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 and output buffers */

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

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

     if (state->in == NULL || state->out == NULL) {

         if (state->out != NULL)

             free(state->out);

         if (state->in != 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,

                        15 + 16, 8, state->strategy);

     if (ret != Z_OK) {

         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 */

     strm->avail_out = state->size;

     strm->next_out = state->out;

     state->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. */

 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;

     /* 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->next);

             if (have && ((got = write(state->fd, state->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->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->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_BUF_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->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->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->pos++;

         return c;

     }

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

     buf[0] = c;

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

         return -1;

     return c;

 }

 /* -- 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;

 }

 #ifdef STDC

 #include <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(state->in, format, va);

     va_end(va);

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

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

 #  else

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

     va_end(va);

 #  endif

 #else

 #  ifdef HAS_vsnprintf_void

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

     va_end(va);

     len = strlen(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->pos += len;

     return len;

 }

 #else /* !STDC */

 /* -- 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 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(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(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(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(state->in);

 #  else

     len = snprintf(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->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 = 0;

     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;

         ret += gz_zero(state, state->skip);

     }

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

     ret += gz_comp(state, Z_FINISH);

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

     free(state->out);

     free(state->in);

     gz_error(state, Z_OK, NULL);

     free(state->path);

     ret += close(state->fd);

     free(state);

     return ret ? Z_ERRNO : Z_OK;

 }