1 files changed, 426 insertions, 0 deletions
diff --git a/libarchive/libarchive-2.5.5/libarchive/archive_read_support_compression_bzip2.c b/libarchive/libarchive-2.5.5/libarchive/archive_read_support_compression_bzip2.c
new file mode 100644
index 0000000..824b0cd
--- /dev/null
+++ b/libarchive/libarchive-2.5.5/libarchive/archive_read_support_compression_bzip2.c
@@ -0,0 +1,426 @@
+/*-
+ * Copyright (c) 2003-2007 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.
+ * 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 "archive_platform.h"
+
+__FBSDID("$FreeBSD: src/lib/libarchive/archive_read_support_compression_bzip2.c,v 1.18 2008/05/26 17:00:22 kientzle Exp $");
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_BZLIB_H
+#include <bzlib.h>
+#endif
+
+#include "archive.h"
+#include "archive_private.h"
+#include "archive_read_private.h"
+
+#if HAVE_BZLIB_H
+struct private_data {
+	bz_stream	 stream;
+	char		*uncompressed_buffer;
+	size_t		 uncompressed_buffer_size;
+	char		*read_next;
+	int64_t		 total_out;
+	char		 eof; /* True = found end of compressed data. */
+};
+
+static int	finish(struct archive_read *);
+static ssize_t	read_ahead(struct archive_read *, const void **, size_t);
+static ssize_t	read_consume(struct archive_read *, size_t);
+static int	drive_decompressor(struct archive_read *a, struct private_data *);
+#endif
+
+/* These two functions are defined even if we lack the library.  See below. */
+static int	bid(const void *, size_t);
+static int	init(struct archive_read *, const void *, size_t);
+
+int
+archive_read_support_compression_bzip2(struct archive *_a)
+{
+	struct archive_read *a = (struct archive_read *)_a;
+	if (__archive_read_register_compression(a, bid, init) != NULL)
+		return (ARCHIVE_OK);
+	return (ARCHIVE_FATAL);
+}
+
+/*
+ * 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 = (const unsigned char *)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;
+	if (len < 5)
+		return (bits_checked);
+
+	/* After BZh[1-9], there must be either a data block
+	 * which begins with 0x314159265359 or an end-of-data
+	 * marker of 0x177245385090. */
+
+	if (buffer[4] == 0x31) {
+		/* Verify the data block signature. */
+		size_t s = len;
+		if (s > 10) s = 10;
+		if (memcmp(buffer + 4, "\x31\x41\x59\x26\x53\x59", s - 4) != 0)
+			return (0);
+		bits_checked += 8 * (s - 4);
+	} else if (buffer[4] == 0x17) {
+		/* Verify the end-of-data marker. */
+		size_t s = len;
+		if (s > 10) s = 10;
+		if (memcmp(buffer + 4, "\x17\x72\x45\x38\x50\x90", s - 4) != 0)
+			return (0);
+		bits_checked += 8 * (s - 4);
+	} else
+		return (0);
+
+	return (bits_checked);
+}
+
+#ifndef HAVE_BZLIB_H
+
+/*
+ * If we don't have the library on this system, we can't actually do the
+ * decompression.  We can, however, still detect compressed archives
+ * and emit a useful message.
+ */
+static int
+init(struct archive_read *a, const void *buff, size_t n)
+{
+	(void)a;	/* UNUSED */
+	(void)buff;	/* UNUSED */
+	(void)n;	/* UNUSED */
+
+	archive_set_error(&a->archive, -1,
+	    "This version of libarchive was compiled without bzip2 support");
+	return (ARCHIVE_FATAL);
+}
+
+
+#else
+
+/*
+ * Setup the callbacks.
+ */
+static int
+init(struct archive_read *a, const void *buff, size_t n)
+{
+	struct private_data *state;
+	int ret;
+
+	a->archive.compression_code = ARCHIVE_COMPRESSION_BZIP2;
+	a->archive.compression_name = "bzip2";
+
+	state = (struct private_data *)malloc(sizeof(*state));
+	if (state == NULL) {
+		archive_set_error(&a->archive, ENOMEM,
+		    "Can't allocate data for %s decompression",
+		    a->archive.compression_name);
+		return (ARCHIVE_FATAL);
+	}
+	memset(state, 0, sizeof(*state));
+
+	state->uncompressed_buffer_size = 64 * 1024;
+	state->uncompressed_buffer = (char *)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->archive, ENOMEM,
+		    "Can't allocate %s decompression buffers",
+		    a->archive.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 = (char *)(uintptr_t)(const void *)buff;
+	state->stream.avail_in = n;
+
+	a->decompressor->read_ahead = read_ahead;
+	a->decompressor->consume = read_consume;
+	a->decompressor->skip = NULL; /* not supported */
+	a->decompressor->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->decompressor->data = state;
+		return (ARCHIVE_OK);
+	}
+
+	/* Library setup failed: Clean up. */
+	archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
+	    "Internal error initializing %s library",
+	    a->archive.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->archive, ARCHIVE_ERRNO_MISC,
+		    "Internal error initializing compression library: "
+		    "invalid setup parameter");
+		break;
+	case BZ_MEM_ERROR:
+		archive_set_error(&a->archive, ENOMEM,
+		    "Internal error initializing compression library: "
+		    "out of memory");
+		break;
+	case BZ_CONFIG_ERROR:
+		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
+		    "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_read *a, const void **p, size_t min)
+{
+	struct private_data *state;
+	size_t read_avail, was_avail;
+	int ret;
+
+	state = (struct private_data *)a->decompressor->data;
+	if (!a->client_reader) {
+		archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
+		    "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 (read_avail < min &&		/* Haven't satisfied min. */
+	    read_avail < state->uncompressed_buffer_size) { /* !full */
+		was_avail = read_avail;
+		if ((ret = drive_decompressor(a, state)) < ARCHIVE_OK)
+			return (ret);
+		if (ret == ARCHIVE_EOF)
+			break; /* Break on EOF even if we haven't met min. */
+		read_avail = state->stream.next_out - state->read_next;
+		if (was_avail == read_avail) /* No progress? */
+			break;
+	}
+
+	*p = state->read_next;
+	return (read_avail);
+}
+
+/*
+ * Mark a previously-returned block of data as read.
+ */
+static ssize_t
+read_consume(struct archive_read *a, size_t n)
+{
+	struct private_data *state;
+
+	state = (struct private_data *)a->decompressor->data;
+	a->archive.file_position += n;
+	state->read_next += n;
+	if (state->read_next > state->stream.next_out)
+		__archive_errx(1, "Request to consume too many "
+		    "bytes from bzip2 decompressor");
+	return (n);
+}
+
+/*
+ * Clean up the decompressor.
+ */
+static int
+finish(struct archive_read *a)
+{
+	struct private_data *state;
+	int ret;
+
+	state = (struct private_data *)a->decompressor->data;
+	ret = ARCHIVE_OK;
+	switch (BZ2_bzDecompressEnd(&(state->stream))) {
+	case BZ_OK:
+		break;
+	default:
+		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
+		    "Failed to clean up %s compressor",
+		    a->archive.compression_name);
+		ret = ARCHIVE_FATAL;
+	}
+
+	free(state->uncompressed_buffer);
+	free(state);
+
+	a->decompressor->data = NULL;
+	return (ret);
+}
+
+/*
+ * Utility function to pull data through decompressor, reading input
+ * blocks as necessary.
+ */
+static int
+drive_decompressor(struct archive_read *a, struct private_data *state)
+{
+	ssize_t ret;
+	int decompressed, total_decompressed;
+	char *output;
+	const void *read_buf;
+
+	if (state->eof)
+		return (ARCHIVE_EOF);
+	total_decompressed = 0;
+	for (;;) {
+		if (state->stream.avail_in == 0) {
+			read_buf = state->stream.next_in;
+			ret = (a->client_reader)(&a->archive, a->client_data,
+			    &read_buf);
+			state->stream.next_in = (void *)(uintptr_t)read_buf;
+			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->archive, EIO,
+				    "Premature end of %s compressed data",
+				    a->archive.compression_name);
+				return (ARCHIVE_FATAL);
+			}
+			a->archive.raw_position += ret;
+			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. */
+				state->eof = 1;
+				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->archive, ARCHIVE_ERRNO_MISC,
+	    "%s decompression failed", a->archive.compression_name);
+	return (ARCHIVE_FATAL);
+}
+
+#endif /* HAVE_BZLIB_H */