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_zalloc(sizeof(*ctx));
if (ctx == NULL) {
COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
return 0;
}
ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
ctx->zin.zalloc = Z_NULL;
ctx->zin.zfree = Z_NULL;
ctx->zout.zalloc = Z_NULL;
ctx->zout.zfree = Z_NULL;
ctx->comp_level = Z_DEFAULT_COMPRESSION;
BIO_set_init(bi, 1);
BIO_set_data(bi, ctx);
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_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_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 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;
}
}