contrib/libarchive/archive_write_set_compression_none.c

   1 /*-
   2  * Copyright (c) 2003-2004 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "archive_platform.h"
  28 __FBSDID("$FreeBSD: src/lib/libarchive/archive_write_set_compression_none.c,v 1.7 2004/11/06 05:25:53 kientzle Exp $");
  29
  30 #include <errno.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33
  34 #include "archive.h"
  35 #include "archive_private.h"
  36
  37 static int      archive_compressor_none_finish(struct archive *a);
  38 static int      archive_compressor_none_init(struct archive *);
  39 static int      archive_compressor_none_write(struct archive *, const void *,
  40                     size_t);
  41
  42 struct archive_none {
  43         char    *buffer;
  44         ssize_t  buffer_size;
  45         char    *next;          /* Current insert location */
  46         ssize_t  avail;         /* Free space left in buffer */
  47 };
  48
  49 int
  50 archive_write_set_compression_none(struct archive *a)
  51 {
  52         archive_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_NEW);
  53         a->compression_init = &archive_compressor_none_init;
  54         a->compression_code = ARCHIVE_COMPRESSION_NONE;
  55         a->compression_name = "none";
  56         return (0);
  57 }
  58
  59 /*
  60  * Setup callback.
  61  */
  62 static int
  63 archive_compressor_none_init(struct archive *a)
  64 {
  65         int ret;
  66         struct archive_none *state;
  67
  68         a->compression_code = ARCHIVE_COMPRESSION_NONE;
  69         a->compression_name = "none";
  70
  71         if (a->client_opener != NULL) {
  72                 ret = (a->client_opener)(a, a->client_data);
  73                 if (ret != 0)
  74                         return (ret);
  75         }
  76
  77         state = (struct archive_none *)malloc(sizeof(*state));
  78         if (state == NULL) {
  79                 archive_set_error(a, ENOMEM,
  80                     "Can't allocate data for output buffering");
  81                 return (ARCHIVE_FATAL);
  82         }
  83         memset(state, 0, sizeof(*state));
  84
  85         state->buffer_size = a->bytes_per_block;
  86         state->buffer = malloc(state->buffer_size);
  87
  88         if (state->buffer == NULL) {
  89                 archive_set_error(a, ENOMEM,
  90                     "Can't allocate output buffer");
  91                 free(state);
  92                 return (ARCHIVE_FATAL);
  93         }
  94
  95         state->next = state->buffer;
  96         state->avail = state->buffer_size;
  97
  98         a->compression_data = state;
  99         a->compression_write = archive_compressor_none_write;
 100         a->compression_finish = archive_compressor_none_finish;
 101         return (ARCHIVE_OK);
 102 }
 103
 104 /*
 105  * Write data to the stream.
 106  */
 107 static int
 108 archive_compressor_none_write(struct archive *a, const void *vbuff,
 109     size_t length)
 110 {
 111         const char *buff;
 112         ssize_t remaining, to_copy;
 113         ssize_t bytes_written;
 114         struct archive_none *state;
 115
 116         state = a->compression_data;
 117         buff = vbuff;
 118         if (a->client_writer == NULL) {
 119                 archive_set_error(a, ARCHIVE_ERRNO_PROGRAMMER,
 120                     "No write callback is registered?  "
 121                     "This is probably an internal programming error.");
 122                 return (ARCHIVE_FATAL);
 123         }
 124
 125         remaining = length;
 126         while (remaining > 0) {
 127                 /*
 128                  * If we have a full output block, write it and reset the
 129                  * output buffer.
 130                  */
 131                 if (state->avail == 0) {
 132                         bytes_written = (a->client_writer)(a, a->client_data,
 133                             state->buffer, state->buffer_size);
 134                         if (bytes_written <= 0)
 135                                 return (ARCHIVE_FATAL);
 136                         /* XXX TODO: if bytes_written < state->buffer_size */
 137                         a->raw_position += bytes_written;
 138                         state->next = state->buffer;
 139                         state->avail = state->buffer_size;
 140                 }
 141
 142                 /* Now we have space in the buffer; copy new data into it. */
 143                 to_copy = (remaining > state->avail) ?
 144                     state->avail : remaining;
 145                 memcpy(state->next, buff, to_copy);
 146                 state->next += to_copy;
 147                 state->avail -= to_copy;
 148                 buff += to_copy;
 149                 remaining -= to_copy;
 150         }
 151         a->file_position += length;
 152         return (ARCHIVE_OK);
 153 }
 154
 155
 156 /*
 157  * Finish the compression.
 158  */
 159 static int
 160 archive_compressor_none_finish(struct archive *a)
 161 {
 162         ssize_t block_length;
 163         ssize_t target_block_length;
 164         ssize_t bytes_written;
 165         int ret;
 166         int ret2;
 167         struct archive_none *state;
 168
 169         state = a->compression_data;
 170         ret = ret2 = ARCHIVE_OK;
 171         if (a->client_writer == NULL) {
 172                 archive_set_error(a, ARCHIVE_ERRNO_PROGRAMMER,
 173                     "No write callback is registered?  "
 174                     "This is probably an internal programming error.");
 175                 return (ARCHIVE_FATAL);
 176         }
 177
 178         /* If there's pending data, pad and write the last block */
 179         if (state->next != state->buffer) {
 180                 block_length = state->buffer_size - state->avail;
 181
 182                 /* Tricky calculation to determine size of last block */
 183                 target_block_length = block_length;
 184                 if (a->bytes_in_last_block <= 0)
 185                         /* Default or Zero: pad to full block */
 186                         target_block_length = a->bytes_per_block;
 187                 else
 188                         /* Round to next multiple of bytes_in_last_block. */
 189                         target_block_length = a->bytes_in_last_block *
 190                             ( (block_length + a->bytes_in_last_block - 1) /
 191                                 a->bytes_in_last_block);
 192                 if (target_block_length > a->bytes_per_block)
 193                         target_block_length = a->bytes_per_block;
 194                 if (block_length < target_block_length) {
 195                         memset(state->next, 0,
 196                             target_block_length - block_length);
 197                         block_length = target_block_length;
 198                 }
 199                 bytes_written = (a->client_writer)(a, a->client_data,
 200                     state->buffer, block_length);
 201                 if (bytes_written <= 0)
 202                         ret = ARCHIVE_FATAL;
 203                 else {
 204                         a->raw_position += bytes_written;
 205                         ret = ARCHIVE_OK;
 206                 }
 207         }
 208
 209         /* Close the output */
 210         if (a->client_closer != NULL)
 211                 ret2 = (a->client_closer)(a, a->client_data);
 212
 213         free(state->buffer);
 214         free(state);
 215         a->compression_data = NULL;
 216
 217         return (ret != ARCHIVE_OK ? ret : ret2);
 218 }