text: /* gzwrite.c -- zlib functions for writing gzip files
   * Copyright (C) 2004-2017 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));
  local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
  
  /* Initialize state for writing a gzip file.  Mark initialization by setting
     state->size to non-zero.  Return -1 on a memory allocation failure, or 0 on
     success. */
  local int gz_init(state)
      gz_statep state;
  {
      int ret;
      z_streamp strm = &(state->strm);
  
      /* allocate input buffer (double size for gzprintf) */
      state->in = (unsigned char *)malloc(state->want << 1);
      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 = (unsigned char *)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;
          }
          strm->next_in = NULL;
      }
  
      /* 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 or if gz_init()
     fails to allocate memory, 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, writ;
      unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
      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) {
          while (strm->avail_in) {
              put = strm->avail_in > max ? max : strm->avail_in;
              writ = write(state->fd, strm->next_in, put);
              if (writ < 0) {
                  gz_error(state, Z_ERRNO, zstrerror());
                  return -1;
              }
              strm->avail_in -= (unsigned)writ;
              strm->next_in += writ;
          }
          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))) {
              while (strm->next_out > state->x.next) {
                  put = strm->next_out - state->x.next > (int)max ? max :
                        (unsigned)(strm->next_out - state->x.next);
                  writ = write(state->fd, state->x.next, put);
                  if (writ < 0) {
                      gz_error(state, Z_ERRNO, zstrerror());
                      return -1;
                  }
                  state->x.next += writ;
              }
              if (strm->avail_out == 0) {
                  strm->avail_out = state->size;
                  strm->next_out = state->out;
                  state->x.next = state->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 a write error or memory
     allocation failure by gz_comp(), or 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;
  }
  
  /* Write len bytes from buf to file.  Return the number of bytes written.  If
     the returned value is less than len, then there was an error. */
  local z_size_t gz_write(state, buf, len)
      gz_statep state;
      voidpc buf;
      z_size_t len;
  {
      z_size_t put = len;
  
      /* 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 {
              unsigned have, copy;
  
              if (state->strm.avail_in == 0)
                  state->strm.next_in = state->in;
              have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
                                state->in);
              copy = state->size - have;
              if (copy > len)
                  copy = (unsigned)len;
              memcpy(state->in + have, buf, copy);
              state->strm.avail_in += copy;
              state->x.pos += copy;
              buf = (const char *)buf + copy;
              len -= copy;
              if (len && gz_comp(state, Z_NO_FLUSH) == -1)
                  return 0;
          } while (len);
      }
      else {
          /* consume whatever's left in the input buffer */
          if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
              return 0;
  
          /* directly compress user buffer to file */
          state->strm.next_in = (z_const Bytef *)buf;
          do {
              unsigned n = (unsigned)-1;
              if (n > len)
                  n = (unsigned)len;
              state->strm.avail_in = n;
              state->x.pos += n;
              if (gz_comp(state, Z_NO_FLUSH) == -1)
                  return 0;
              len -= n;
          } while (len);
      }
  
      /* input was all buffered or compressed */
      return put;
  }
  
  /* -- see zlib.h -- */
  int ZEXPORT gzwrite(file, buf, len)
      gzFile file;
      voidpc buf;
      unsigned len;
  {
      gz_statep state;
  
      /* get internal structure */
      if (file == NULL)
          return 0;
      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 0;
  
      /* since an int is returned, make sure len fits in one, otherwise return
         with an error (this avoids a flaw in the interface) */
      if ((int)len < 0) {
          gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
          return 0;
      }
  
      /* write len bytes from buf (the return value will fit in an int) */
      return (int)gz_write(state, buf, len);
  }
  
  /* -- see zlib.h -- */
  z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
      voidpc buf;
      z_size_t size;
      z_size_t nitems;
      gzFile file;
  {
      z_size_t len;
      gz_statep state;
  
      /* get internal structure */
      if (file == NULL)
          return 0;
      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 0;
  
      /* compute bytes to read -- error on overflow */
      len = nitems * size;
      if (size && len / size != nitems) {
          gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
          return 0;
      }
  
      /* write len bytes to buf, return the number of full items written */
      return len ? gz_write(state, buf, len) / size : 0;
  }
  
  /* -- see zlib.h -- */
  int ZEXPORT gzputc(file, c)
      gzFile file;
      int c;
  {
      unsigned have;
      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 (state->size) {
          if (strm->avail_in == 0)
              strm->next_in = state->in;
          have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
          if (have < state->size) {
              state->in[have] = (unsigned char)c;
              strm->avail_in++;
              state->x.pos++;
              return c & 0xff;
          }
      }
  
      /* no room in buffer or not initialized, use gz_write() */
      buf[0] = (unsigned char)c;
      if (gz_write(state, buf, 1) != 1)
          return -1;
      return c & 0xff;
  }
  
  /* -- see zlib.h -- */
  int ZEXPORT gzputs(file, str)
      gzFile file;
      const char *str;
  {
      z_size_t len, put;
      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 -1;
  
      /* write string */
      len = strlen(str);
      if ((int)len < 0 || (unsigned)len != len) {
          gz_error(state, Z_STREAM_ERROR, "string length does not fit in int");
          return -1;
      }
      put = gz_write(state, str, len);
      return put < len ? -1 : (int)len;
  }
  
  #if defined(STDC) || defined(Z_HAVE_STDARG_H)
  #include <stdarg.h>
  
  /* -- see zlib.h -- */
  int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
  {
      int len;
      unsigned left;
      char *next;
      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;
  
      /* make sure we have some buffer space */
      if (state->size == 0 && gz_init(state) == -1)
          return state->err;
  
      /* check for seek request */
      if (state->seek) {
          state->seek = 0;
          if (gz_zero(state, state->skip) == -1)
              return state->err;
      }
  
      /* do the printf() into the input buffer, put length in len -- the input
         buffer is double-sized just for this function, so there is guaranteed to
         be state->size bytes available after the current contents */
      if (strm->avail_in == 0)
          strm->next_in = state->in;
      next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
      next[state->size - 1] = 0;
  #ifdef NO_vsnprintf
  #  ifdef HAS_vsprintf_void
      (void)vsprintf(next, format, va);
      for (len = 0; len < state->size; len++)
          if (next[len] == 0) break;
  #  else
      len = vsprintf(next, format, va);
  #  endif
  #else
  #  ifdef HAS_vsnprintf_void
      (void)vsnprintf(next, state->size, format, va);
      len = strlen(next);
  #  else
      len = vsnprintf(next, state->size, format, va);
  #  endif
  #endif
  
      /* check that printf() results fit in buffer */
      if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
          return 0;
  
      /* update buffer and position, compress first half if past that */
      strm->avail_in += (unsigned)len;
      state->x.pos += len;
      if (strm->avail_in >= state->size) {
          left = strm->avail_in - state->size;
          strm->avail_in = state->size;
          if (gz_comp(state, Z_NO_FLUSH) == -1)
              return state->err;
          memcpy(state->in, state->in + state->size, left);
          strm->next_in = state->in;
          strm->avail_in = left;
      }
      return len;
  }
  
  int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
  {
      va_list va;
      int ret;
  
      va_start(va, format);
      ret = gzvprintf(file, format, va);
      va_end(va);
      return ret;
  }
  
  #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;
  {
      unsigned len, left;
      char *next;
      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 can really pass pointer in ints */
      if (sizeof(int) != sizeof(void *))
          return Z_STREAM_ERROR;
  
      /* check that we're writing and that there's no error */
      if (state->mode != GZ_WRITE || state->err != Z_OK)
          return Z_STREAM_ERROR;
  
      /* make sure we have some buffer space */
      if (state->size == 0 && gz_init(state) == -1)
          return state->error;
  
      /* check for seek request */
      if (state->seek) {
          state->seek = 0;
          if (gz_zero(state, state->skip) == -1)
              return state->error;
      }
  
      /* do the printf() into the input buffer, put length in len -- the input
         buffer is double-sized just for this function, so there is guaranteed to
         be state->size bytes available after the current contents */
      if (strm->avail_in == 0)
          strm->next_in = state->in;
      next = (char *)(strm->next_in + strm->avail_in);
      next[state->size - 1] = 0;
  #ifdef NO_snprintf
  #  ifdef HAS_sprintf_void
      sprintf(next, 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 (next[len] == 0)
              break;
  #  else
      len = sprintf(next, 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(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
               a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
      len = strlen(next);
  #  else
      len = snprintf(next, state->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 >= state->size || next[state->size - 1] != 0)
          return 0;
  
      /* update buffer and position, compress first half if past that */
      strm->avail_in += len;
      state->x.pos += len;
      if (strm->avail_in >= state->size) {
          left = strm->avail_in - state->size;
          strm->avail_in = state->size;
          if (gz_comp(state, Z_NO_FLUSH) == -1)
              return state->err;
          memcpy(state->in, state->in + state->size, left);
          strm->next_in = state->in;
          strm->avail_in = left;
      }
      return (int)len;
  }
  
  #endif
  
  /* -- see zlib.h -- */
  int ZEXPORT gzflush(file, flush)
      gzFile file;
      int flush;
  {
      gz_statep state;
  
      /* get internal structure */
      if (file == NULL)
          return Z_STREAM_ERROR;
      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 state->err;
      }
  
      /* compress remaining data with requested flush */
      (void)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 state->err;
      }
  
      /* 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_BLOCK) == -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 (gz_comp(state, Z_FINISH) == -1)
          ret = state->err;
      if (state->size) {
          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;
  }
  