diff options
Diffstat (limited to 'src/libs/3rdparty/libarchive/archive_read_open_memory.c')
| -rw-r--r-- | src/libs/3rdparty/libarchive/archive_read_open_memory.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/libs/3rdparty/libarchive/archive_read_open_memory.c b/src/libs/3rdparty/libarchive/archive_read_open_memory.c new file mode 100644 index 000000000..311be4704 --- /dev/null +++ b/src/libs/3rdparty/libarchive/archive_read_open_memory.c @@ -0,0 +1,186 @@ +/*- + * 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_open_memory.c,v 1.6 2007/07/06 15:51:59 kientzle Exp $"); + +#include <errno.h> +#include <stdlib.h> +#include <string.h> + +#include "archive.h" + +/* + * Glue to read an archive from a block of memory. + * + * This is mostly a huge help in building test harnesses; + * test programs can build archives in memory and read them + * back again without having to mess with files on disk. + */ + +struct read_memory_data { + const unsigned char *start; + const unsigned char *p; + const unsigned char *end; + ssize_t read_size; +}; + +static int memory_read_close(struct archive *, void *); +static int memory_read_open(struct archive *, void *); +static int64_t memory_read_seek(struct archive *, void *, int64_t offset, int whence); +static int64_t memory_read_skip(struct archive *, void *, int64_t request); +static ssize_t memory_read(struct archive *, void *, const void **buff); + +int +archive_read_open_memory(struct archive *a, const void *buff, size_t size) +{ + return archive_read_open_memory2(a, buff, size, size); +} + +/* + * Don't use _open_memory2() in production code; the archive_read_open_memory() + * version is the one you really want. This is just here so that + * test harnesses can exercise block operations inside the library. + */ +int +archive_read_open_memory2(struct archive *a, const void *buff, + size_t size, size_t read_size) +{ + struct read_memory_data *mine; + + mine = (struct read_memory_data *)calloc(1, sizeof(*mine)); + if (mine == NULL) { + archive_set_error(a, ENOMEM, "No memory"); + return (ARCHIVE_FATAL); + } + mine->start = mine->p = (const unsigned char *)buff; + mine->end = mine->start + size; + mine->read_size = read_size; + archive_read_set_open_callback(a, memory_read_open); + archive_read_set_read_callback(a, memory_read); + archive_read_set_seek_callback(a, memory_read_seek); + archive_read_set_skip_callback(a, memory_read_skip); + archive_read_set_close_callback(a, memory_read_close); + archive_read_set_callback_data(a, mine); + return (archive_read_open1(a)); +} + +/* + * There's nothing to open. + */ +static int +memory_read_open(struct archive *a, void *client_data) +{ + (void)a; /* UNUSED */ + (void)client_data; /* UNUSED */ + return (ARCHIVE_OK); +} + +/* + * This is scary simple: Just advance a pointer. Limiting + * to read_size is not technically necessary, but it exercises + * more of the internal logic when used with a small block size + * in a test harness. Production use should not specify a block + * size; then this is much faster. + */ +static ssize_t +memory_read(struct archive *a, void *client_data, const void **buff) +{ + struct read_memory_data *mine = (struct read_memory_data *)client_data; + ssize_t size; + + (void)a; /* UNUSED */ + *buff = mine->p; + size = mine->end - mine->p; + if (size > mine->read_size) + size = mine->read_size; + mine->p += size; + return (size); +} + +/* + * Advancing is just as simple. Again, this is doing more than + * necessary in order to better exercise internal code when used + * as a test harness. + */ +static int64_t +memory_read_skip(struct archive *a, void *client_data, int64_t skip) +{ + struct read_memory_data *mine = (struct read_memory_data *)client_data; + + (void)a; /* UNUSED */ + if ((int64_t)skip > (int64_t)(mine->end - mine->p)) + skip = mine->end - mine->p; + /* Round down to block size. */ + skip /= mine->read_size; + skip *= mine->read_size; + mine->p += skip; + return (skip); +} + +/* + * Seeking. + */ +static int64_t +memory_read_seek(struct archive *a, void *client_data, int64_t offset, int whence) +{ + struct read_memory_data *mine = (struct read_memory_data *)client_data; + + (void)a; /* UNUSED */ + switch (whence) { + case SEEK_SET: + mine->p = mine->start + offset; + break; + case SEEK_CUR: + mine->p += offset; + break; + case SEEK_END: + mine->p = mine->end + offset; + break; + default: + return ARCHIVE_FATAL; + } + if (mine->p < mine->start) { + mine->p = mine->start; + return ARCHIVE_FAILED; + } + if (mine->p > mine->end) { + mine->p = mine->end; + return ARCHIVE_FAILED; + } + return (mine->p - mine->start); +} + +/* + * Close is just cleaning up our one small bit of data. + */ +static int +memory_read_close(struct archive *a, void *client_data) +{ + struct read_memory_data *mine = (struct read_memory_data *)client_data; + (void)a; /* UNUSED */ + free(mine); + return (ARCHIVE_OK); +} |