dc46be1cbf
* If write block size is zero, don't block at all.
This supports the unusual requirement of applications
that need "no-delay" writes.
* Expose _write_finish_entry() to give such applications more
control over write boundaries. (Normal applications do not
need this, as entries are completed automatically.)
* Correct the type of write callbacks; this is a minor API
change that does not affect the ABI.
* Correct the error handling in _write_next_header() around
completing the previous entry.
* Correct the documentation for block-size markers: Remove
docs for the long-defunct _read_set_block_size(); document
all of the write block size manipulators.
MFC after: 14 days
128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/*-
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* Copyright (c) 2003-2006 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "archive.h"
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/*
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* This is a little tricky. I used to allow the
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* compression handling layer to fork the compressor,
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* which means this write function gets invoked in
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* a separate process. That would, of course, make it impossible
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* to actually use the data stored into memory here.
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* Fortunately, none of the compressors fork today and
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* I'm reluctant to use that route in the future but, if
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* forking compressors ever do reappear, this will have
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* to get a lot more complicated.
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*/
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struct write_memory_data {
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size_t used;
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size_t size;
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size_t * client_size;
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unsigned char * buff;
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};
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static int memory_write_close(struct archive *, void *);
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static int memory_write_open(struct archive *, void *);
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static ssize_t memory_write(struct archive *, void *, const void *buff, size_t);
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/*
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* Client provides a pointer to a block of memory to receive
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* the data. The 'size' param both tells us the size of the
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* client buffer and lets us tell the client the final size.
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*/
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int
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archive_write_open_memory(struct archive *a, void *buff, size_t buffSize, size_t *used)
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{
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struct write_memory_data *mine;
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mine = (struct write_memory_data *)malloc(sizeof(*mine));
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if (mine == NULL) {
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archive_set_error(a, ENOMEM, "No memory");
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return (ARCHIVE_FATAL);
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}
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memset(mine, 0, sizeof(*mine));
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mine->buff = buff;
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mine->size = buffSize;
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mine->client_size = used;
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return (archive_write_open(a, mine,
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memory_write_open, memory_write, memory_write_close));
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}
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static int
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memory_write_open(struct archive *a, void *client_data)
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{
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struct write_memory_data *mine;
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mine = client_data;
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mine->used = 0;
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if (mine->client_size != NULL)
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*mine->client_size = mine->used;
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/* Disable padding if it hasn't been set explicitly. */
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if (-1 == archive_write_get_bytes_in_last_block(a))
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archive_write_set_bytes_in_last_block(a, 1);
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return (ARCHIVE_OK);
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}
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/*
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* Copy the data into the client buffer.
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* Note that we update mine->client_size on every write.
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* In particular, this means the client can follow exactly
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* how much has been written into their buffer at any time.
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*/
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static ssize_t
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memory_write(struct archive *a, void *client_data, const void *buff, size_t length)
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{
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struct write_memory_data *mine;
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mine = client_data;
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if (mine->used + length > mine->size) {
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archive_set_error(a, ENOMEM, "Buffer exhausted");
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return (ARCHIVE_FATAL);
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}
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memcpy(mine->buff + mine->used, buff, length);
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mine->used += length;
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if (mine->client_size != NULL)
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*mine->client_size = mine->used;
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return (length);
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}
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static int
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memory_write_close(struct archive *a, void *client_data)
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{
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struct write_memory_data *mine;
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(void)a; /* UNUSED */
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mine = client_data;
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free(mine);
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return (ARCHIVE_OK);
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}
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