c_zlib.c

OpenSSL 0.9.8k 最新版OpenSSL

			if (zlib_stateful_ex_idx == -1)
				zlib_stateful_ex_idx =
					CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
						0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
			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