1 files changed, 365 insertions, 0 deletions
diff --git a/lib/libarchive/archive_read_support_compression_bzip2.c b/lib/libarchive/archive_read_support_compression_bzip2.c
new file mode 100644
index 0000000000000..c97160f8869e9
--- /dev/null
+++ b/lib/libarchive/archive_read_support_compression_bzip2.c
@@ -0,0 +1,365 @@
+/*-
+ * Copyright (c) 2003-2004 Tim Kientzle
+ * 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
+ *    in this position and unchanged.
+ * 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(S) ``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(S) 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#ifdef DMALLOC
+#include <dmalloc.h>
+#endif
+#include <err.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <bzlib.h>
+
+#include "archive.h"
+#include "archive_private.h"
+
+struct private_data {
+	bz_stream	 stream;
+	unsigned char	*uncompressed_buffer;
+	size_t		 uncompressed_buffer_size;
+	char		*read_next;
+	int64_t		 total_out;
+};
+
+static int	bid(const void *, size_t);
+static int	finish(struct archive *);
+static int	init(struct archive *, const void *, size_t);
+static ssize_t	read_ahead(struct archive *, const void **, size_t);
+static ssize_t	read_consume(struct archive *, size_t);
+static int	drive_decompressor(struct archive *a, struct private_data *);
+
+int
+archive_read_support_compression_bzip2(struct archive *a)
+{
+	return (__archive_read_register_compression(a, bid, init));
+}
+
+/*
+ * Test whether we can handle this data.
+ *
+ * This logic returns zero if any part of the signature fails.  It
+ * also tries to Do The Right Thing if a very short buffer prevents us
+ * from verifying as much as we would like.
+ */
+static int
+bid(const void *buff, size_t len)
+{
+	const unsigned char *buffer;
+	int bits_checked;
+
+	if (len < 1)
+		return (0);
+
+	buffer = buff;
+	bits_checked = 0;
+	if (buffer[0] != 'B')	/* Verify first ID byte. */
+		return (0);
+	bits_checked += 8;
+	if (len < 2)
+		return (bits_checked);
+
+	if (buffer[1] != 'Z')	/* Verify second ID byte. */
+		return (0);
+	bits_checked += 8;
+	if (len < 3)
+		return (bits_checked);
+
+	if (buffer[2] != 'h')	/* Verify third ID byte. */
+		return (0);
+	bits_checked += 8;
+	if (len < 4)
+		return (bits_checked);
+
+	if (buffer[3] < '1' || buffer[3] > '9')
+		return (0);
+	bits_checked += 5;
+
+	/*
+	 * Research Question: Can we do any more to verify that this
+	 * really is BZip2 format??  For 99.9% of the time, the above
+	 * test is sufficient, but it would be nice to do a more
+	 * thorough check.  It's especially troubling that the BZip2
+	 * signature begins with all ASCII characters; a tar archive
+	 * whose first filename begins with 'BZh3' would potentially
+	 * fool this logic.  (It may also be possible to gaurd against
+	 * such anomalies in archive_read_support_compression_none.)
+	 */
+
+	return (bits_checked);
+}
+
+/*
+ * Setup the callbacks.
+ */
+static int
+init(struct archive *a, const void *buff, size_t n)
+{
+	struct private_data *state;
+	int ret;
+
+	a->compression_code = ARCHIVE_COMPRESSION_BZIP2;
+	a->compression_name = "bzip2";
+
+	state = malloc(sizeof(*state));
+	if (state == NULL) {
+		archive_set_error(a, ENOMEM,
+		    "Can't allocate data for %s decompression",
+		    a->compression_name);
+		return (ARCHIVE_FATAL);
+	}
+	memset(state, 0, sizeof(*state));
+
+	state->uncompressed_buffer_size = 64 * 1024;
+	state->uncompressed_buffer = malloc(state->uncompressed_buffer_size);
+	state->stream.next_out = state->uncompressed_buffer;
+	state->read_next = state->uncompressed_buffer;
+	state->stream.avail_out = state->uncompressed_buffer_size;
+
+	if (state->uncompressed_buffer == NULL) {
+		archive_set_error(a, ENOMEM,
+		    "Can't allocate %s decompression buffers",
+		    a->compression_name);
+		free(state);
+		return (ARCHIVE_FATAL);
+	}
+
+	/*
+	 * A bug in bzlib.h: stream.next_in should be marked 'const'
+	 * but isn't (the library never alters data through the
+	 * next_in pointer, only reads it).  The result: this ugly
+	 * cast to remove 'const'.
+	 */
+	state->stream.next_in = (void *)(uintptr_t)(const void *)buff;
+	state->stream.avail_in = n;
+
+	a->compression_read_ahead = read_ahead;
+	a->compression_read_consume = read_consume;
+	a->compression_finish = finish;
+
+	/* Initialize compression library. */
+	ret = BZ2_bzDecompressInit(&(state->stream),
+	    0 /* library verbosity */,
+	    0 /* don't use slow low-mem algorithm */);
+
+	/* If init fails, try using low-memory algorithm instead. */
+	if (ret == BZ_MEM_ERROR) {
+		ret = BZ2_bzDecompressInit(&(state->stream),
+		    0 /* library verbosity */,
+		    1 /* do use slow low-mem algorithm */);
+	}
+
+	if (ret == BZ_OK) {
+		a->compression_data = state;
+		return (ARCHIVE_OK);
+	}
+
+	/* Library setup failed: Clean up. */
+	archive_set_error(a, -1, "Internal error initializing %s library",
+	    a->compression_name);
+	free(state->uncompressed_buffer);
+	free(state);
+
+	/* Override the error message if we know what really went wrong. */
+	switch (ret) {
+	case BZ_PARAM_ERROR:
+		archive_set_error(a, -1,
+		    "Internal error initializing compression library: "
+		    "invalid setup parameter");
+		break;
+	case BZ_MEM_ERROR:
+		archive_set_error(a, -1,
+		    "Internal error initializing compression library: "
+		    "out of memory");
+		break;
+	case BZ_CONFIG_ERROR:
+		archive_set_error(a, -1,
+		    "Internal error initializing compression library: "
+		    "mis-compiled library");
+		break;
+	}
+
+	return (ARCHIVE_FATAL);
+}
+
+/*
+ * Return a block of data from the decompression buffer.  Decompress more
+ * as necessary.
+ */
+static ssize_t
+read_ahead(struct archive *a, const void **p, size_t min)
+{
+	struct private_data *state;
+	int read_avail, was_avail, ret;
+
+	state = a->compression_data;
+	was_avail = -1;
+	if (!a->client_reader) {
+		archive_set_error(a, EINVAL,
+		    "No read callback is registered?  "
+		    "This is probably an internal programming error.");
+		return (ARCHIVE_FATAL);
+	}
+
+	read_avail = state->stream.next_out - state->read_next;
+
+	if (read_avail + state->stream.avail_out < min) {
+		memmove(state->uncompressed_buffer, state->read_next,
+		    read_avail);
+		state->read_next = state->uncompressed_buffer;
+		state->stream.next_out = state->read_next + read_avail;
+		state->stream.avail_out
+		    = state->uncompressed_buffer_size - read_avail;
+	}
+
+	while (was_avail < read_avail &&	/* Made some progress. */
+	    read_avail < (int)min &&		/* Haven't satisfied min. */
+	    read_avail < (int)state->uncompressed_buffer_size) { /* !full */
+		if ((ret = drive_decompressor(a, state)) != ARCHIVE_OK)
+			return (ret);
+		was_avail = read_avail;
+		read_avail = state->stream.next_out - state->read_next;
+	}
+
+	*p = state->read_next;
+	return (read_avail);
+}
+
+/*
+ * Mark a previously-returned block of data as read.
+ */
+static ssize_t
+read_consume(struct archive *a, size_t n)
+{
+	struct private_data *state;
+
+	state = a->compression_data;
+	a->file_position += n;
+	state->read_next += n;
+	if (state->read_next > state->stream.next_out)
+		errx(1, "Internal error: Request to consume too many "
+		    "bytes from %s decompressor.\n",
+		    a->compression_name);
+	return (n);
+}
+
+/*
+ * Clean up the decompressor.
+ */
+static int
+finish(struct archive *a)
+{
+	struct private_data *state;
+	int ret;
+
+	state = a->compression_data;
+	ret = ARCHIVE_OK;
+	switch (BZ2_bzDecompressEnd(&(state->stream))) {
+	case BZ_OK:
+		break;
+	default:
+		archive_set_error(a, -1, "Failed to clean up %s compressor",
+		    a->compression_name);
+		ret = ARCHIVE_FATAL;
+	}
+
+	free(state->uncompressed_buffer);
+	free(state);
+
+	a->compression_data = NULL;
+	if (a->client_closer != NULL)
+		(a->client_closer)(a, a->client_data);
+
+	return (ret);
+}
+
+/*
+ * Utility function to pull data through decompressor, reading input
+ * blocks as necessary.
+ */
+static int
+drive_decompressor(struct archive *a, struct private_data *state)
+{
+	ssize_t ret;
+	int decompressed, total_decompressed;
+	char *output;
+
+	total_decompressed = 0;
+	for (;;) {
+		if (state->stream.avail_in == 0) {
+			ret = (a->client_reader)(a, a->client_data,
+			    (const void **)&state->stream.next_in);
+			if (ret < 0) {
+				/*
+				 * TODO: Find a better way to handle
+				 * this read failure.
+				 */
+				goto fatal;
+			}
+			if (ret == 0  &&  total_decompressed == 0) {
+				archive_set_error(a, -1,
+				    "Premature end of %s compressed data",
+				    a->compression_name);
+				return (ARCHIVE_FATAL);
+			}
+			state->stream.avail_in = ret;
+		}
+
+		{
+			output = state->stream.next_out;
+
+			/* Decompress some data. */
+			ret = BZ2_bzDecompress(&(state->stream));
+			decompressed = state->stream.next_out - output;
+
+			/* Accumulate the total bytes of output. */
+			state->total_out += decompressed;
+			total_decompressed += decompressed;
+
+			switch (ret) {
+			case BZ_OK: /* Decompressor made some progress. */
+				if (decompressed > 0)
+					return (ARCHIVE_OK);
+				break;
+			case BZ_STREAM_END:	/* Found end of stream. */
+				return (ARCHIVE_OK);
+			default:
+				/* Any other return value is an error. */
+				goto fatal;
+			}
+		}
+	}
+	return (ARCHIVE_OK);
+
+	/* Return a fatal error. */
+fatal:
+	archive_set_error(a, -1, "%s decompression failed",
+	    a->compression_name);
+	return (ARCHIVE_FATAL);
+}