/*
* Write data to the compressed stream.
*
* Returns ARCHIVE_OK if all data written, error otherwise.
*/
static int
archive_compressor_bzip2_write(struct archive_write *a, const void *buff,
size_t length)
{
struct private_data *state;
state = (struct private_data *)a->compressor.data;
if (a->client_writer == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
"No write callback is registered? "
"This is probably an internal programming error.");
return (ARCHIVE_FATAL);
}
/* Update statistics */
state->total_in += length;
/* Compress input data to output buffer */
SET_NEXT_IN(state, buff);
state->stream.avail_in = length;
if (drive_compressor(a, state, 0))
return (ARCHIVE_FATAL);
a->archive.file_position += length;
return (ARCHIVE_OK);
}
/*
* Write data to the compressed stream.
*
* Returns ARCHIVE_OK if all data written, error otherwise.
*/
static int
archive_compressor_bzip2_write(struct archive_write_filter *f,
const void *buff, size_t length)
{
struct private_data *data = (struct private_data *)f->data;
/* Update statistics */
data->total_in += length;
/* Compress input data to output buffer */
SET_NEXT_IN(data, buff);
data->stream.avail_in = length;
if (drive_compressor(f, data, 0))
return (ARCHIVE_FATAL);
return (ARCHIVE_OK);
}
/*
* Finish the compression.
*/
static int
archive_compressor_bzip2_finish(struct archive_write *a)
{
ssize_t block_length;
int ret;
struct private_data *state;
ssize_t target_block_length;
ssize_t bytes_written;
unsigned tocopy;
ret = ARCHIVE_OK;
state = (struct private_data *)a->compressor.data;
if (state != NULL) {
if (a->client_writer == NULL) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_PROGRAMMER,
"No write callback is registered?\n"
"This is probably an internal programming error.");
ret = ARCHIVE_FATAL;
goto cleanup;
}
/* By default, always pad the uncompressed data. */
if (a->pad_uncompressed) {
tocopy = a->bytes_per_block -
(state->total_in % a->bytes_per_block);
while (tocopy > 0 && tocopy < (unsigned)a->bytes_per_block) {
SET_NEXT_IN(state, a->nulls);
state->stream.avail_in = tocopy < a->null_length ?
tocopy : a->null_length;
state->total_in += state->stream.avail_in;
tocopy -= state->stream.avail_in;
ret = drive_compressor(a, state, 0);
if (ret != ARCHIVE_OK)
goto cleanup;
}
}
/* Finish compression cycle. */
if ((ret = drive_compressor(a, state, 1)))
goto cleanup;
/* Optionally, pad the final compressed block. */
block_length = state->stream.next_out - state->compressed;
/* Tricky calculation to determine size of last block. */
if (a->bytes_in_last_block <= 0)
/* Default or Zero: pad to full block */
target_block_length = a->bytes_per_block;
else
/* Round length 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->stream.next_out, 0,
target_block_length - block_length);
block_length = target_block_length;
}
/* Write the last block */
bytes_written = (a->client_writer)(&a->archive, a->client_data,
state->compressed, block_length);
/* TODO: Handle short write of final block. */
if (bytes_written <= 0)
ret = ARCHIVE_FATAL;
else {
a->archive.raw_position += ret;
ret = ARCHIVE_OK;
}
/* Cleanup: shut down compressor, release memory, etc. */
cleanup:
switch (BZ2_bzCompressEnd(&(state->stream))) {
case BZ_OK:
break;
default:
archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
"Failed to clean up compressor");
ret = ARCHIVE_FATAL;
}
free(state->compressed);
free(state);
}
/* Free configuration data even if we were never fully initialized. */
free(a->compressor.config);
a->compressor.config = NULL;
return (ret);
}