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c_zlib.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/objects.h>
#include <openssl/comp.h>
#include <openssl/err.h>

COMP_METHOD *COMP_zlib(void );

static COMP_METHOD zlib_method_nozlib={
      NID_undef,
      "(undef)",
      NULL,
      NULL,
      NULL,
      NULL,
      NULL,
      NULL,
      };

#ifndef ZLIB
#undef ZLIB_SHARED
#else

#include <zlib.h>

static int zlib_stateful_init(COMP_CTX *ctx);
static void zlib_stateful_finish(COMP_CTX *ctx);
static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
      unsigned int olen, unsigned char *in, unsigned int ilen);
static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
      unsigned int olen, unsigned char *in, unsigned int ilen);


/* memory allocations functions for zlib intialization */
static void* zlib_zalloc(void* opaque, unsigned int no, unsigned int size)
{
      void *p;
      
      p=OPENSSL_malloc(no*size);
      if (p)
            memset(p, 0, no*size);
      return p;
}


static void zlib_zfree(void* opaque, void* address)
{
      OPENSSL_free(address);
}

#if 0
static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
      unsigned int olen, unsigned char *in, unsigned int ilen);
static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
      unsigned int olen, unsigned char *in, unsigned int ilen);

static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
      uLong sourceLen);

static COMP_METHOD zlib_stateless_method={
      NID_zlib_compression,
      LN_zlib_compression,
      NULL,
      NULL,
      zlib_compress_block,
      zlib_expand_block,
      NULL,
      NULL,
      };
#endif

static COMP_METHOD zlib_stateful_method={
      NID_zlib_compression,
      LN_zlib_compression,
      zlib_stateful_init,
      zlib_stateful_finish,
      zlib_stateful_compress_block,
      zlib_stateful_expand_block,
      NULL,
      NULL,
      };

/* 
 * When OpenSSL is built on Windows, we do not want to require that
 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
 * work.  Therefore, all ZLIB routines are loaded at run time
 * and we do not link to a .LIB file when ZLIB_SHARED is set.
 */
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
# include <windows.h>
#endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */

#ifdef ZLIB_SHARED
#include <openssl/dso.h>

/* Function pointers */
typedef int (*compress_ft)(Bytef *dest,uLongf *destLen,
      const Bytef *source, uLong sourceLen);
typedef int (*inflateEnd_ft)(z_streamp strm);
typedef int (*inflate_ft)(z_streamp strm, int flush);
typedef int (*inflateInit__ft)(z_streamp strm,
      const char * version, int stream_size);
typedef int (*deflateEnd_ft)(z_streamp strm);
typedef int (*deflate_ft)(z_streamp strm, int flush);
typedef int (*deflateInit__ft)(z_streamp strm, int level,
      const char * version, int stream_size);
typedef const char * (*zError__ft)(int err);
static compress_ft      p_compress=NULL;
static inflateEnd_ft    p_inflateEnd=NULL;
static inflate_ft p_inflate=NULL;
static inflateInit__ft  p_inflateInit_=NULL;
static deflateEnd_ft    p_deflateEnd=NULL;
static deflate_ft p_deflate=NULL;
static deflateInit__ft  p_deflateInit_=NULL;
static zError__ft p_zError=NULL;

static int zlib_loaded = 0;     /* only attempt to init func pts once */
static DSO *zlib_dso = NULL;

#define compress                p_compress
#define inflateEnd              p_inflateEnd
#define inflate                 p_inflate
#define inflateInit_            p_inflateInit_
#define deflateEnd              p_deflateEnd
#define deflate                 p_deflate
#define deflateInit_            p_deflateInit_
#define zError                p_zError
#endif /* ZLIB_SHARED */

struct zlib_state
      {
      z_stream istream;
      z_stream ostream;
      };

static int zlib_stateful_ex_idx = -1;

static int zlib_stateful_init(COMP_CTX *ctx)
      {
      int err;
      struct zlib_state *state =
            (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));

      if (state == NULL)
            goto err;

      state->istream.zalloc = zlib_zalloc;
      state->istream.zfree = zlib_zfree;
      state->istream.opaque = Z_NULL;
      state->istream.next_in = Z_NULL;
      state->istream.next_out = Z_NULL;
      state->istream.avail_in = 0;
      state->istream.avail_out = 0;
      err = inflateInit_(&state->istream,
            ZLIB_VERSION, sizeof(z_stream));
      if (err != Z_OK)
            goto err;

      state->ostream.zalloc = zlib_zalloc;
      state->ostream.zfree = zlib_zfree;
      state->ostream.opaque = Z_NULL;
      state->ostream.next_in = Z_NULL;
      state->ostream.next_out = Z_NULL;
      state->ostream.avail_in = 0;
      state->ostream.avail_out = 0;
      err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
            ZLIB_VERSION, sizeof(z_stream));
      if (err != Z_OK)
            goto err;

      CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
      CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
      return 1;
 err:
      if (state) OPENSSL_free(state);
      return 0;
      }

static void zlib_stateful_finish(COMP_CTX *ctx)
      {
      struct zlib_state *state =
            (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
                  zlib_stateful_ex_idx);
      inflateEnd(&state->istream);
      deflateEnd(&state->ostream);
      OPENSSL_free(state);
      CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
      }

static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
      unsigned int olen, unsigned char *in, unsigned int ilen)
      {
      int err = Z_OK;
      struct zlib_state *state =
            (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
                  zlib_stateful_ex_idx);

      if (state == NULL)
            return -1;

      state->ostream.next_in = in;
      state->ostream.avail_in = ilen;
      state->ostream.next_out = out;
      state->ostream.avail_out = olen;
      if (ilen > 0)
            err = deflate(&state->ostream, Z_SYNC_FLUSH);
      if (err != Z_OK)
            return -1;
#ifdef DEBUG_ZLIB
      fprintf(stderr,"compress(%4d)->%4d %s\n",
            ilen,olen - state->ostream.avail_out,
            (ilen != olen - state->ostream.avail_out)?"zlib":"clear");
#endif
      return olen - state->ostream.avail_out;
      }

static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
      unsigned int olen, unsigned char *in, unsigned int ilen)
      {
      int err = Z_OK;

      struct zlib_state *state =
            (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
                  zlib_stateful_ex_idx);

      if (state == NULL)
            return 0;

      state->istream.next_in = in;
      state->istream.avail_in = ilen;
      state->istream.next_out = out;
      state->istream.avail_out = olen;
      if (ilen > 0)
            err = inflate(&state->istream, Z_SYNC_FLUSH);
      if (err != Z_OK)
            return -1;
#ifdef DEBUG_ZLIB
      fprintf(stderr,"expand(%4d)->%4d %s\n",
            ilen,olen - state->istream.avail_out,
            (ilen != olen - state->istream.avail_out)?"zlib":"clear");
#endif
      return olen - state->istream.avail_out;
      }

#if 0
static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
      unsigned int olen, unsigned char *in, unsigned int ilen)
      {
      unsigned long l;
      int i;
      int clear=1;

      if (ilen > 128)
            {
            out[0]=1;
            l=olen-1;
            i=compress(&(out[1]),&l,in,(unsigned long)ilen);
            if (i != Z_OK)
                  return(-1);
            if (ilen > l)
                  {
                  clear=0;
                  l++;
                  }
            }
      if (clear)
            {
            out[0]=0;
            memcpy(&(out[1]),in,ilen);
            l=ilen+1;
            }
#ifdef DEBUG_ZLIB
      fprintf(stderr,"compress(%4d)->%4d %s\n",
            ilen,(int)l,(clear)?"clear":"zlib");
#endif
      return((int)l);
      }

static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
      unsigned int olen, unsigned char *in, unsigned int ilen)
      {
      unsigned long l;
      int i;

      if (in[0])
            {
            l=olen;
            i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
            if (i != Z_OK)
                  return(-1);
            }
      else
            {
            memcpy(out,&(in[1]),ilen-1);
            l=ilen-1;
            }
#ifdef DEBUG_ZLIB
        fprintf(stderr,"expand  (%4d)->%4d %s\n",
            ilen,(int)l,in[0]?"zlib":"clear");
#endif
      return((int)l);
      }

static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
           uLong sourceLen)
{
    z_stream stream;
    int err;

    stream.next_in = (Bytef*)source;
    stream.avail_in = (uInt)sourceLen;
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;

    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;

    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;

    err = inflateInit_(&stream,
          ZLIB_VERSION, sizeof(z_stream));
    if (err != Z_OK) return err;

    err = inflate(&stream, Z_FINISH);
    if (err != Z_STREAM_END) {
        inflateEnd(&stream);
        return err;
    }
    *destLen = stream.total_out;

    err = inflateEnd(&stream);
    return err;
}
#endif

#endif

COMP_METHOD *COMP_zlib(void)
      {
      COMP_METHOD *meth = &zlib_method_nozlib;

#ifdef ZLIB_SHARED
      if (!zlib_loaded)
            {
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
            zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
#else
            zlib_dso = DSO_load(NULL, "z", NULL, 0);
#endif
            if (zlib_dso != NULL)
                  {
                  p_compress
                        = (compress_ft) DSO_bind_func(zlib_dso,
                              "compress");
                  p_inflateEnd
                        = (inflateEnd_ft) DSO_bind_func(zlib_dso,
                              "inflateEnd");
                  p_inflate
                        = (inflate_ft) DSO_bind_func(zlib_dso,
                              "inflate");
                  p_inflateInit_
                        = (inflateInit__ft) DSO_bind_func(zlib_dso,
                              "inflateInit_");
                  p_deflateEnd
                        = (deflateEnd_ft) DSO_bind_func(zlib_dso,
                              "deflateEnd");
                  p_deflate
                        = (deflate_ft) DSO_bind_func(zlib_dso,
                              "deflate");
                  p_deflateInit_
                        = (deflateInit__ft) DSO_bind_func(zlib_dso,
                              "deflateInit_");
                  p_zError
                        = (zError__ft) DSO_bind_func(zlib_dso,
                              "zError");

                  if (p_compress && p_inflateEnd && p_inflate
                        && p_inflateInit_ && p_deflateEnd
                        && p_deflate && p_deflateInit_ && p_zError)
                        zlib_loaded++;
                  }
            }

#endif
#ifdef ZLIB_SHARED
      if (zlib_loaded)
#endif
#if defined(ZLIB) || defined(ZLIB_SHARED)
            {
            /* init zlib_stateful_ex_idx here so that in a multi-process
             * application it's enough to intialize openssl before forking
             * (idx will be inherited in all the children) */
            if (zlib_stateful_ex_idx == -1)
                  {
                  CRYPTO_w_lock(CRYPTO_LOCK_COMP);
                  if (zlib_stateful_ex_idx == -1)
                        zlib_stateful_ex_idx =
                              CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
                                    0,NULL,NULL,NULL,NULL);
                  CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
                  if (zlib_stateful_ex_idx == -1)
                        goto err;
                  }
            
            meth = &zlib_stateful_method;
            }
err:  
#endif

      return(meth);
      }

void COMP_zlib_cleanup(void)
      {
#ifdef ZLIB_SHARED
      if (zlib_dso)
            DSO_free(zlib_dso);
#endif
      }

#ifdef ZLIB

/* Zlib based compression/decompression filter BIO */

typedef struct
      {
      unsigned char *ibuf;    /* Input buffer */
      int ibufsize;           /* Buffer size */
      z_stream zin;           /* Input decompress context */
      unsigned char *obuf;    /* Output buffer */
      int obufsize;           /* Output buffer size */
      unsigned char *optr;    /* Position in output buffer */
      int ocount;       /* Amount of data in output buffer */
      int odone;        /* deflate EOF */
      int comp_level;         /* Compression level to use */
      z_stream zout;          /* Output compression context */
      } BIO_ZLIB_CTX;

#define ZLIB_DEFAULT_BUFSIZE 1024

static int bio_zlib_new(BIO *bi);
static int bio_zlib_free(BIO *bi);
static int bio_zlib_read(BIO *b, char *out, int outl);
static int bio_zlib_write(BIO *b, const char *in, int inl);
static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp);

static BIO_METHOD bio_meth_zlib = 
      {
      BIO_TYPE_COMP,
      "zlib",
      bio_zlib_write,
      bio_zlib_read,
      NULL,
      NULL,
      bio_zlib_ctrl,
      bio_zlib_new,
      bio_zlib_free,
      bio_zlib_callback_ctrl
      };

BIO_METHOD *BIO_f_zlib(void)
      {
      return &bio_meth_zlib;
      }


static int bio_zlib_new(BIO *bi)
      {
      BIO_ZLIB_CTX *ctx;
#ifdef ZLIB_SHARED
      (void)COMP_zlib();
      if (!zlib_loaded)
            {
            COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
            return 0;
            }
#endif
      ctx = OPENSSL_malloc(sizeof(BIO_ZLIB_CTX));
      if(!ctx)
            {
            COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
            return 0;
            }
      ctx->ibuf = NULL;
      ctx->obuf = NULL;
      ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
      ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
      ctx->zin.zalloc = Z_NULL;
      ctx->zin.zfree = Z_NULL;
      ctx->zin.next_in = NULL;
      ctx->zin.avail_in = 0;
      ctx->zin.next_out = NULL;
      ctx->zin.avail_out = 0;
      ctx->zout.zalloc = Z_NULL;
      ctx->zout.zfree = Z_NULL;
      ctx->zout.next_in = NULL;
      ctx->zout.avail_in = 0;
      ctx->zout.next_out = NULL;
      ctx->zout.avail_out = 0;
      ctx->odone = 0;
      ctx->comp_level = Z_DEFAULT_COMPRESSION;
      bi->init = 1;
      bi->ptr = (char *)ctx;
      bi->flags = 0;
      return 1;
      }

static int bio_zlib_free(BIO *bi)
      {
      BIO_ZLIB_CTX *ctx;
      if(!bi) return 0;
      ctx = (BIO_ZLIB_CTX *)bi->ptr;
      if(ctx->ibuf)
            {
            /* Destroy decompress context */
            inflateEnd(&ctx->zin);
            OPENSSL_free(ctx->ibuf);
            }
      if(ctx->obuf)
            {
            /* Destroy compress context */
            deflateEnd(&ctx->zout);
            OPENSSL_free(ctx->obuf);
            }
      OPENSSL_free(ctx);
      bi->ptr = NULL;
      bi->init = 0;
      bi->flags = 0;
      return 1;
      }

static int bio_zlib_read(BIO *b, char *out, int outl)
      {
      BIO_ZLIB_CTX *ctx;
      int ret;
      z_stream *zin;
      if(!out || !outl) return 0;
      ctx = (BIO_ZLIB_CTX *)b->ptr;
      zin = &ctx->zin;
      BIO_clear_retry_flags(b);
      if(!ctx->ibuf)
            {
            ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
            if(!ctx->ibuf)
                  {
                  COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
                  return 0;
                  }
            inflateInit(zin);
            zin->next_in = ctx->ibuf;
            zin->avail_in = 0;
            }

      /* Copy output data directly to supplied buffer */
      zin->next_out = (unsigned char *)out;
      zin->avail_out = (unsigned int)outl;
      for(;;)
            {
            /* Decompress while data available */
            while(zin->avail_in)
                  {
                  ret = inflate(zin, 0);
                  if((ret != Z_OK) && (ret != Z_STREAM_END))
                        {
                        COMPerr(COMP_F_BIO_ZLIB_READ,
                                    COMP_R_ZLIB_INFLATE_ERROR);
                        ERR_add_error_data(2, "zlib error:",
                                          zError(ret));
                        return 0;
                        }
                  /* If EOF or we've read everything then return */
                  if((ret == Z_STREAM_END) || !zin->avail_out)
                        return outl - zin->avail_out;
                  }

            /* No data in input buffer try to read some in,
             * if an error then return the total data read.
             */
            ret = BIO_read(b->next_bio, ctx->ibuf, ctx->ibufsize);
            if(ret <= 0)
                  {
                  /* Total data read */
                  int tot = outl - zin->avail_out;
                  BIO_copy_next_retry(b);
                  if(ret < 0) return (tot > 0) ? tot : ret;
                  return tot;
                  }
            zin->avail_in = ret;
            zin->next_in = ctx->ibuf;
            }
      }

static int bio_zlib_write(BIO *b, const char *in, int inl)
      {
      BIO_ZLIB_CTX *ctx;
      int ret;
      z_stream *zout;
      if(!in || !inl) return 0;
      ctx = (BIO_ZLIB_CTX *)b->ptr;
      if(ctx->odone) return 0;
      zout = &ctx->zout;
      BIO_clear_retry_flags(b);
      if(!ctx->obuf)
            {
            ctx->obuf = OPENSSL_malloc(ctx->obufsize);
            /* Need error here */
            if(!ctx->obuf)
                  {
                  COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
                  return 0;
                  }
            ctx->optr = ctx->obuf;
            ctx->ocount = 0;
            deflateInit(zout, ctx->comp_level);
            zout->next_out = ctx->obuf;
            zout->avail_out = ctx->obufsize;
            }
      /* Obtain input data directly from supplied buffer */
      zout->next_in = (void *)in;
      zout->avail_in = inl;
      for(;;)
            {
            /* If data in output buffer write it first */
            while(ctx->ocount) {
                  ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
                  if(ret <= 0)
                        {
                        /* Total data written */
                        int tot = inl - zout->avail_in;
                        BIO_copy_next_retry(b);
                        if(ret < 0) return (tot > 0) ? tot : ret;
                        return tot;
                        }
                  ctx->optr += ret;
                  ctx->ocount -= ret;
            }

            /* Have we consumed all supplied data? */
            if(!zout->avail_in)
                  return inl;

            /* Compress some more */

            /* Reset buffer */
            ctx->optr = ctx->obuf;
            zout->next_out = ctx->obuf;
            zout->avail_out = ctx->obufsize;
            /* Compress some more */
            ret = deflate(zout, 0);
            if(ret != Z_OK)
                  {
                  COMPerr(COMP_F_BIO_ZLIB_WRITE,
                                    COMP_R_ZLIB_DEFLATE_ERROR);
                  ERR_add_error_data(2, "zlib error:", zError(ret));
                  return 0;
                  }
            ctx->ocount = ctx->obufsize - zout->avail_out;
            }
      }

static int bio_zlib_flush(BIO *b)
      {
      BIO_ZLIB_CTX *ctx;
      int ret;
      z_stream *zout;
      ctx = (BIO_ZLIB_CTX *)b->ptr;
      /* If no data written or already flush show success */
      if(!ctx->obuf || (ctx->odone && !ctx->ocount)) return 1;
      zout = &ctx->zout;
      BIO_clear_retry_flags(b);
      /* No more input data */
      zout->next_in = NULL;
      zout->avail_in = 0;
      for(;;)
            {
            /* If data in output buffer write it first */
            while(ctx->ocount)
                  {
                  ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
                  if(ret <= 0)
                        {
                        BIO_copy_next_retry(b);
                        return ret;
                        }
                  ctx->optr += ret;
                  ctx->ocount -= ret;
                  }
            if(ctx->odone) return 1;

            /* Compress some more */

            /* Reset buffer */
            ctx->optr = ctx->obuf;
            zout->next_out = ctx->obuf;
            zout->avail_out = ctx->obufsize;
            /* Compress some more */
            ret = deflate(zout, Z_FINISH);
            if(ret == Z_STREAM_END) ctx->odone = 1;
            else if(ret != Z_OK)
                  {
                  COMPerr(COMP_F_BIO_ZLIB_FLUSH,
                                    COMP_R_ZLIB_DEFLATE_ERROR);
                  ERR_add_error_data(2, "zlib error:", zError(ret));
                  return 0;
                  }
            ctx->ocount = ctx->obufsize - zout->avail_out;
            }
      }

static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
      {
      BIO_ZLIB_CTX *ctx;
      int ret, *ip;
      int ibs, obs;
      if(!b->next_bio) return 0;
      ctx = (BIO_ZLIB_CTX *)b->ptr;
      switch (cmd)
            {

      case BIO_CTRL_RESET:
            ctx->ocount = 0;
            ctx->odone = 0;
            ret = 1;
            break;

      case BIO_CTRL_FLUSH:
            ret = bio_zlib_flush(b);
            if (ret > 0)
                  ret = BIO_flush(b->next_bio);
            break;

      case BIO_C_SET_BUFF_SIZE:
            ibs = -1;
            obs = -1;
            if (ptr != NULL)
                  {
                  ip = ptr;
                  if (*ip == 0)
                        ibs = (int) num;
                  else 
                        obs = (int) num;
                  }
            else
                  {
                  ibs = (int)num;
                  obs = ibs;
                  }

            if (ibs != -1)
                  {
                  if (ctx->ibuf)
                        {
                        OPENSSL_free(ctx->ibuf);
                        ctx->ibuf = NULL;
                        }
                  ctx->ibufsize = ibs;
                  }

            if (obs != -1)
                  {
                  if (ctx->obuf)
                        {
                        OPENSSL_free(ctx->obuf);
                        ctx->obuf = NULL;
                        }
                  ctx->obufsize = obs;
                  }
            ret = 1;
            break;

      case BIO_C_DO_STATE_MACHINE:
            BIO_clear_retry_flags(b);
            ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
            BIO_copy_next_retry(b);
            break;

      default:
            ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
            break;

            }

      return ret;
      }


static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
      {
      if(!b->next_bio)
            return 0;
      return
            BIO_callback_ctrl(b->next_bio, cmd, fp);
      }

#endif

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