FreeBSD-5.3/lib/libarchive/archive_write_set_compression_none.c
/*-
* 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 "archive_platform.h"
__FBSDID("$FreeBSD: src/lib/libarchive/archive_write_set_compression_none.c,v 1.5 2004/08/07 19:21:18 kientzle Exp $");
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "archive.h"
#include "archive_private.h"
static int archive_compressor_none_finish(struct archive *a);
static int archive_compressor_none_init(struct archive *);
static ssize_t archive_compressor_none_write(struct archive *, const void *,
size_t);
struct archive_none {
char *buffer;
ssize_t buffer_size;
char *next; /* Current insert location */
ssize_t avail; /* Free space left in buffer */
};
int
archive_write_set_compression_none(struct archive *a)
{
archive_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_NEW);
a->compression_init = &archive_compressor_none_init;
a->compression_code = ARCHIVE_COMPRESSION_NONE;
a->compression_name = "none";
return (0);
}
/*
* Setup callback.
*/
static int
archive_compressor_none_init(struct archive *a)
{
int ret;
struct archive_none *state;
a->compression_code = ARCHIVE_COMPRESSION_NONE;
a->compression_name = "none";
if (a->client_opener != NULL) {
ret = (a->client_opener)(a, a->client_data);
if (ret != 0)
return (ret);
}
state = (struct archive_none *)malloc(sizeof(*state));
if (state == NULL) {
archive_set_error(a, ENOMEM,
"Can't allocate data for output buffering");
return (ARCHIVE_FATAL);
}
memset(state, 0, sizeof(*state));
state->buffer_size = a->bytes_per_block;
state->buffer = malloc(state->buffer_size);
if (state->buffer == NULL) {
archive_set_error(a, ENOMEM,
"Can't allocate output buffer");
free(state);
return (ARCHIVE_FATAL);
}
state->next = state->buffer;
state->avail = state->buffer_size;
a->compression_data = state;
a->compression_write = archive_compressor_none_write;
a->compression_finish = archive_compressor_none_finish;
return (ARCHIVE_OK);
}
/*
* Write data to the stream.
*/
static ssize_t
archive_compressor_none_write(struct archive *a, const void *vbuff,
size_t length)
{
const char *buff;
ssize_t remaining, to_copy;
int ret;
struct archive_none *state;
state = a->compression_data;
buff = vbuff;
if (a->client_writer == NULL) {
archive_set_error(a, ARCHIVE_ERRNO_PROGRAMMER,
"No write callback is registered? "
"This is probably an internal programming error.");
return (ARCHIVE_FATAL);
}
remaining = length;
while (remaining > 0) {
/*
* If we have a full output block, write it and reset the
* output buffer.
*/
if (state->avail == 0) {
ret = (a->client_writer)(a, a->client_data,
state->buffer, state->buffer_size);
/* XXX TODO: if ret < state->buffer_size XXX */
a->raw_position += ret;
state->next = state->buffer;
state->avail = state->buffer_size;
}
/* Now we have space in the buffer; copy new data into it. */
to_copy = (remaining > state->avail) ?
state->avail : remaining;
memcpy(state->next, buff, to_copy);
state->next += to_copy;
state->avail -= to_copy;
buff += to_copy;
remaining -= to_copy;
}
a->file_position += length;
return (length);
}
/*
* Finish the compression.
*/
static int
archive_compressor_none_finish(struct archive *a)
{
ssize_t block_length;
ssize_t target_block_length;
int ret;
int ret2;
struct archive_none *state;
state = a->compression_data;
ret = ret2 = ARCHIVE_OK;
if (a->client_writer == NULL) {
archive_set_error(a, ARCHIVE_ERRNO_PROGRAMMER,
"No write callback is registered? "
"This is probably an internal programming error.");
return (ARCHIVE_FATAL);
}
/* If there's pending data, pad and write the last block */
if (state->next != state->buffer) {
block_length = state->buffer_size - state->avail;
/* Tricky calculation to determine size of last block */
target_block_length = block_length;
if (a->bytes_in_last_block <= 0)
/* Default or Zero: pad to full block */
target_block_length = a->bytes_per_block;
else
/* Round to next multiple of bytes_in_last_block. */
target_block_length = a->bytes_in_last_block *
( (block_length + a->bytes_in_last_block - 1) /
a->bytes_in_last_block);
if (target_block_length > a->bytes_per_block)
target_block_length = a->bytes_per_block;
if (block_length < target_block_length) {
memset(state->next, 0,
target_block_length - block_length);
block_length = target_block_length;
}
ret = (a->client_writer)(a, a->client_data, state->buffer,
block_length);
a->raw_position += ret;
}
/* Close the output */
if (a->client_closer != NULL)
ret2 = (a->client_closer)(a, a->client_data);
free(state->buffer);
free(state);
a->compression_data = NULL;
return (ret != ARCHIVE_OK ? ret : ret2);
}