1 files changed, 348 insertions, 0 deletions
diff --git a/contrib/pgcrypto/pgp-compress.c b/contrib/pgcrypto/pgp-compress.c
new file mode 100644
index 0000000..3636a66
--- /dev/null
+++ b/contrib/pgcrypto/pgp-compress.c
@@ -0,0 +1,348 @@
+/*
+ * pgp-compress.c
+ *	  ZIP and ZLIB compression via zlib.
+ *
+ * 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/pgp-compress.c
+ */
+
+#include "postgres.h"
+
+#include "pgp.h"
+#include "px.h"
+
+/*
+ * Compressed pkt writer
+ */
+
+#ifdef HAVE_LIBZ
+
+#include <zlib.h>
+
+#define ZIP_OUT_BUF 8192
+#define ZIP_IN_BLOCK 8192
+
+struct ZipStat
+{
+	uint8		type;
+	int			buf_len;
+	int			hdr_done;
+	z_stream	stream;
+	uint8		buf[ZIP_OUT_BUF];
+};
+
+static void *
+z_alloc(void *priv, unsigned n_items, unsigned item_len)
+{
+	return px_alloc(n_items * item_len);
+}
+
+static void
+z_free(void *priv, void *addr)
+{
+	px_free(addr);
+}
+
+static int
+compress_init(PushFilter *next, void *init_arg, void **priv_p)
+{
+	int			res;
+	struct ZipStat *st;
+	PGP_Context *ctx = init_arg;
+	uint8		type = ctx->compress_algo;
+
+	if (type != PGP_COMPR_ZLIB && type != PGP_COMPR_ZIP)
+		return PXE_PGP_UNSUPPORTED_COMPR;
+
+	/*
+	 * init
+	 */
+	st = px_alloc(sizeof(*st));
+	memset(st, 0, sizeof(*st));
+	st->buf_len = ZIP_OUT_BUF;
+	st->stream.zalloc = z_alloc;
+	st->stream.zfree = z_free;
+
+	if (type == PGP_COMPR_ZIP)
+		res = deflateInit2(&st->stream, ctx->compress_level,
+						   Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY);
+	else
+		res = deflateInit(&st->stream, ctx->compress_level);
+	if (res != Z_OK)
+	{
+		px_free(st);
+		return PXE_PGP_COMPRESSION_ERROR;
+	}
+	*priv_p = st;
+
+	return ZIP_IN_BLOCK;
+}
+
+/* writes compressed data packet */
+
+/* can handle zero-len incoming data, but shouldn't */
+static int
+compress_process(PushFilter *next, void *priv, const uint8 *data, int len)
+{
+	int			res,
+				n_out;
+	struct ZipStat *st = priv;
+
+	/*
+	 * process data
+	 */
+	st->stream.next_in = unconstify(uint8 *, data);
+	st->stream.avail_in = len;
+	while (st->stream.avail_in > 0)
+	{
+		st->stream.next_out = st->buf;
+		st->stream.avail_out = st->buf_len;
+		res = deflate(&st->stream, Z_NO_FLUSH);
+		if (res != Z_OK)
+			return PXE_PGP_COMPRESSION_ERROR;
+
+		n_out = st->buf_len - st->stream.avail_out;
+		if (n_out > 0)
+		{
+			res = pushf_write(next, st->buf, n_out);
+			if (res < 0)
+				return res;
+		}
+	}
+
+	return 0;
+}
+
+static int
+compress_flush(PushFilter *next, void *priv)
+{
+	int			res,
+				zres,
+				n_out;
+	struct ZipStat *st = priv;
+
+	st->stream.next_in = NULL;
+	st->stream.avail_in = 0;
+	while (1)
+	{
+		st->stream.next_out = st->buf;
+		st->stream.avail_out = st->buf_len;
+		zres = deflate(&st->stream, Z_FINISH);
+		if (zres != Z_STREAM_END && zres != Z_OK)
+			return PXE_PGP_COMPRESSION_ERROR;
+
+		n_out = st->buf_len - st->stream.avail_out;
+		if (n_out > 0)
+		{
+			res = pushf_write(next, st->buf, n_out);
+			if (res < 0)
+				return res;
+		}
+		if (zres == Z_STREAM_END)
+			break;
+	}
+	return 0;
+}
+
+static void
+compress_free(void *priv)
+{
+	struct ZipStat *st = priv;
+
+	deflateEnd(&st->stream);
+	px_memset(st, 0, sizeof(*st));
+	px_free(st);
+}
+
+static const PushFilterOps
+			compress_filter = {
+	compress_init, compress_process, compress_flush, compress_free
+};
+
+int
+pgp_compress_filter(PushFilter **res, PGP_Context *ctx, PushFilter *dst)
+{
+	return pushf_create(res, &compress_filter, ctx, dst);
+}
+
+/*
+ * Decompress
+ */
+struct DecomprData
+{
+	int			buf_len;		/* = ZIP_OUT_BUF */
+	int			buf_data;		/* available data */
+	uint8	   *pos;
+	z_stream	stream;
+	int			eof;
+	uint8		buf[ZIP_OUT_BUF];
+};
+
+static int
+decompress_init(void **priv_p, void *arg, PullFilter *src)
+{
+	PGP_Context *ctx = arg;
+	struct DecomprData *dec;
+	int			res;
+
+	if (ctx->compress_algo != PGP_COMPR_ZLIB
+		&& ctx->compress_algo != PGP_COMPR_ZIP)
+		return PXE_PGP_UNSUPPORTED_COMPR;
+
+	dec = px_alloc(sizeof(*dec));
+	memset(dec, 0, sizeof(*dec));
+	dec->buf_len = ZIP_OUT_BUF;
+	*priv_p = dec;
+
+	dec->stream.zalloc = z_alloc;
+	dec->stream.zfree = z_free;
+
+	if (ctx->compress_algo == PGP_COMPR_ZIP)
+		res = inflateInit2(&dec->stream, -15);
+	else
+		res = inflateInit(&dec->stream);
+	if (res != Z_OK)
+	{
+		px_free(dec);
+		px_debug("decompress_init: inflateInit error");
+		return PXE_PGP_COMPRESSION_ERROR;
+	}
+
+	return 0;
+}
+
+static int
+decompress_read(void *priv, PullFilter *src, int len,
+				uint8 **data_p, uint8 *buf, int buflen)
+{
+	int			res;
+	int			flush;
+	struct DecomprData *dec = priv;
+
+restart:
+	if (dec->buf_data > 0)
+	{
+		if (len > dec->buf_data)
+			len = dec->buf_data;
+		*data_p = dec->pos;
+		dec->pos += len;
+		dec->buf_data -= len;
+		return len;
+	}
+
+	if (dec->eof)
+		return 0;
+
+	if (dec->stream.avail_in == 0)
+	{
+		uint8	   *tmp;
+
+		res = pullf_read(src, 8192, &tmp);
+		if (res < 0)
+			return res;
+		dec->stream.next_in = tmp;
+		dec->stream.avail_in = res;
+	}
+
+	dec->stream.next_out = dec->buf;
+	dec->stream.avail_out = dec->buf_len;
+	dec->pos = dec->buf;
+
+	/*
+	 * Z_SYNC_FLUSH is tell zlib to output as much as possible. It should do
+	 * it anyway (Z_NO_FLUSH), but seems to reserve the right not to.  So lets
+	 * follow the API.
+	 */
+	flush = dec->stream.avail_in ? Z_SYNC_FLUSH : Z_FINISH;
+	res = inflate(&dec->stream, flush);
+	if (res != Z_OK && res != Z_STREAM_END)
+	{
+		px_debug("decompress_read: inflate error: %d", res);
+		return PXE_PGP_CORRUPT_DATA;
+	}
+
+	dec->buf_data = dec->buf_len - dec->stream.avail_out;
+	if (res == Z_STREAM_END)
+	{
+		uint8	   *tmp;
+
+		/*
+		 * A stream must be terminated by a normal packet.  If the last stream
+		 * packet in the source stream is a full packet, a normal empty packet
+		 * must follow.  Since the underlying packet reader doesn't know that
+		 * the compressed stream has been ended, we need to to consume the
+		 * terminating packet here.  This read does not harm even if the
+		 * stream has already ended.
+		 */
+		res = pullf_read(src, 1, &tmp);
+
+		if (res < 0)
+			return res;
+		else if (res > 0)
+		{
+			px_debug("decompress_read: extra bytes after end of stream");
+			return PXE_PGP_CORRUPT_DATA;
+		}
+		dec->eof = 1;
+	}
+	goto restart;
+}
+
+static void
+decompress_free(void *priv)
+{
+	struct DecomprData *dec = priv;
+
+	inflateEnd(&dec->stream);
+	px_memset(dec, 0, sizeof(*dec));
+	px_free(dec);
+}
+
+static const PullFilterOps
+			decompress_filter = {
+	decompress_init, decompress_read, decompress_free
+};
+
+int
+pgp_decompress_filter(PullFilter **res, PGP_Context *ctx, PullFilter *src)
+{
+	return pullf_create(res, &decompress_filter, ctx, src);
+}
+#else							/* !HAVE_LIBZ */
+
+int
+pgp_compress_filter(PushFilter **res, PGP_Context *ctx, PushFilter *dst)
+{
+	return PXE_PGP_UNSUPPORTED_COMPR;
+}
+
+int
+pgp_decompress_filter(PullFilter **res, PGP_Context *ctx, PullFilter *src)
+{
+	return PXE_PGP_UNSUPPORTED_COMPR;
+}
+
+#endif