--- /dev/null
+/*-
+ * Copyright (c) 2008 Miklos Vajna
+ * 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("FIXME");
+
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#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_LZMADEC_H
+#include <lzmadec.h>
+#endif
+
+#include "archive.h"
+#include "archive_private.h"
+#include "archive_read_private.h"
+
+#ifdef HAVE_LZMADEC_H
+struct private_data {
+ lzmadec_stream stream;
+ unsigned char *uncompressed_buffer;
+ size_t uncompressed_buffer_size;
+ unsigned 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_lzma(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] != 0x5d) /* Verify first ID byte. */
+ return (0);
+ bits_checked += 8;
+
+ return (bits_checked);
+}
+
+
+#ifndef HAVE_LZMADEC_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 lzma 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_LZMA;
+ a->archive.compression_name = "lzma";
+
+ 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 = (unsigned 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 lzmadec.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 = (uint8_t *)(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 = lzmadec_init(&(state->stream));
+ if (ret == LZMADEC_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 LZMADEC_HEADER_ERROR:
+ archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
+ "Internal error initializing compression library: "
+ "invalid header");
+ break;
+ case LZMADEC_MEM_ERROR:
+ archive_set_error(&a->archive, ENOMEM,
+ "Internal error initializing compression library: "
+ "not enough memory");
+ 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 lzma 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 (lzmadec_end(&(state->stream))) {
+ case LZMADEC_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;
+ uint8_t *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 = lzmadec_decode(&(state->stream), state->stream.avail_in == 0);
+ decompressed = state->stream.next_out - output;
+
+ /* Accumulate the total bytes of output. */
+ state->total_out += decompressed;
+ total_decompressed += decompressed;
+
+ switch (ret) {
+ case LZMADEC_OK: /* Decompressor made some progress. */
+ if (decompressed > 0)
+ return (ARCHIVE_OK);
+ break;
+ case LZMADEC_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_LZMADEC_H */
projects / thirdparty / libarchive.git / commitdiff
