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-rw-r--r--contrib/pgcrypto/mbuf.h124
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diff --git a/contrib/pgcrypto/mbuf.h b/contrib/pgcrypto/mbuf.h
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+/*
+ * mbuf.h
+ * Memory buffer operations.
+ *
+ * Copyright (c) 2005 Marko Kreen
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * contrib/pgcrypto/mbuf.h
+ */
+
+#ifndef __PX_MBUF_H
+#define __PX_MBUF_H
+
+typedef struct MBuf MBuf;
+typedef struct PushFilter PushFilter;
+typedef struct PullFilter PullFilter;
+typedef struct PushFilterOps PushFilterOps;
+typedef struct PullFilterOps PullFilterOps;
+
+struct PushFilterOps
+{
+ /*
+ * should return needed buffer size, 0- no buffering, <0 on error if NULL,
+ * no buffering, and priv=init_arg
+ */
+ int (*init) (PushFilter *next, void *init_arg, void **priv_p);
+
+ /*
+ * send data to next. should consume all? if null, it will be simply
+ * copied (in-place) returns 0 on error
+ */
+ int (*push) (PushFilter *next, void *priv,
+ const uint8 *src, int len);
+ int (*flush) (PushFilter *next, void *priv);
+ void (*free) (void *priv);
+};
+
+struct PullFilterOps
+{
+ /*
+ * should return needed buffer size, 0- no buffering, <0 on error if NULL,
+ * no buffering, and priv=init_arg
+ */
+ int (*init) (void **priv_p, void *init_arg, PullFilter *src);
+
+ /*
+ * request data from src, put result ptr to data_p can use ptr from src or
+ * use buf as work area if NULL in-place copy
+ */
+ int (*pull) (void *priv, PullFilter *src, int len,
+ uint8 **data_p, uint8 *buf, int buflen);
+ void (*free) (void *priv);
+};
+
+/*
+ * Memory buffer
+ */
+MBuf *mbuf_create(int len);
+MBuf *mbuf_create_from_data(uint8 *data, int len);
+int mbuf_tell(MBuf *mbuf);
+int mbuf_avail(MBuf *mbuf);
+int mbuf_size(MBuf *mbuf);
+int mbuf_grab(MBuf *mbuf, int len, uint8 **data_p);
+int mbuf_steal_data(MBuf *mbuf, uint8 **data_p);
+int mbuf_append(MBuf *dst, const uint8 *buf, int cnt);
+int mbuf_rewind(MBuf *mbuf);
+int mbuf_free(MBuf *mbuf);
+
+/*
+ * Push filter
+ */
+int pushf_create(PushFilter **res, const PushFilterOps *ops, void *init_arg,
+ PushFilter *next);
+int pushf_write(PushFilter *mp, const uint8 *data, int len);
+void pushf_free_all(PushFilter *mp);
+void pushf_free(PushFilter *mp);
+int pushf_flush(PushFilter *mp);
+
+int pushf_create_mbuf_writer(PushFilter **mp_p, MBuf *mbuf);
+
+/*
+ * Pull filter
+ */
+int pullf_create(PullFilter **res, const PullFilterOps *ops,
+ void *init_arg, PullFilter *src);
+int pullf_read(PullFilter *mp, int len, uint8 **data_p);
+int pullf_read_max(PullFilter *mp, int len,
+ uint8 **data_p, uint8 *tmpbuf);
+void pullf_free(PullFilter *mp);
+int pullf_read_fixed(PullFilter *src, int len, uint8 *dst);
+
+int pullf_create_mbuf_reader(PullFilter **pf_p, MBuf *mbuf);
+
+#define GETBYTE(pf, dst) \
+ do { \
+ uint8 __b; \
+ int __res = pullf_read_fixed(pf, 1, &__b); \
+ if (__res < 0) \
+ return __res; \
+ (dst) = __b; \
+ } while (0)
+
+#endif /* __PX_MBUF_H */