# include <alloca.h>
#endif
+/* wimlib internal flags used when writing resources. */
+#define WRITE_RESOURCE_FLAG_RECOMPRESS 0x00000001
+#define WRITE_RESOURCE_FLAG_PIPABLE 0x00000002
+#define WRITE_RESOURCE_FLAG_PACK_STREAMS 0x00000004
+
static inline int
write_flags_to_resource_flags(int write_flags)
{
int write_resource_flags = 0;
if (write_flags & WIMLIB_WRITE_FLAG_RECOMPRESS)
- write_resource_flags |= WIMLIB_WRITE_RESOURCE_FLAG_RECOMPRESS;
+ write_resource_flags |= WRITE_RESOURCE_FLAG_RECOMPRESS;
if (write_flags & WIMLIB_WRITE_FLAG_PIPABLE)
- write_resource_flags |= WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE;
+ write_resource_flags |= WRITE_RESOURCE_FLAG_PIPABLE;
if (write_flags & WIMLIB_WRITE_FLAG_PACK_STREAMS)
- write_resource_flags |= WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS;
+ write_resource_flags |= WRITE_RESOURCE_FLAG_PACK_STREAMS;
return write_resource_flags;
}
{
const struct wim_resource_spec *rspec;
- if (write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_RECOMPRESS)
+ if (write_resource_flags & WRITE_RESOURCE_FLAG_RECOMPRESS)
return false;
if (out_ctype == WIMLIB_COMPRESSION_TYPE_NONE)
rspec = lte->rspec;
- if (rspec->is_pipable != !!(write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE))
+ if (rspec->is_pipable != !!(write_resource_flags & WRITE_RESOURCE_FLAG_PIPABLE))
return false;
}
if ((rspec->flags & WIM_RESHDR_FLAG_PACKED_STREAMS) &&
- (write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS))
+ (write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS))
{
/* Packed resource: Such resources may contain multiple streams,
* and in general only a subset of them need to be written. As
* potentially decreasing the number of chunk entries needed. */
expected_num_chunks = DIV_ROUND_UP(res_expected_size, ctx->out_chunk_size);
expected_num_chunk_entries = expected_num_chunks;
- if (!(ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS))
+ if (!(ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS))
expected_num_chunk_entries--;
/* Make sure the chunk_csizes array is long enough to store the
ctx->chunk_index = 0;
- if (!(ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE)) {
+ if (!(ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PIPABLE)) {
/* Reserve space for the chunk table in the output file. In the
* case of packed resources this reserves the upper bound for
* the needed space, not necessarily the exact space which will
reserve_size = expected_num_chunk_entries *
get_chunk_entry_size(res_expected_size,
ctx->write_resource_flags);
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS)
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS)
reserve_size += sizeof(struct alt_chunk_table_header_disk);
memset(ctx->chunk_csizes, 0, reserve_size);
ret = full_write(ctx->out_fd, ctx->chunk_csizes, reserve_size);
actual_num_chunks = ctx->chunk_index;
actual_num_chunk_entries = actual_num_chunks;
- if (!(ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS))
+ if (!(ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS))
actual_num_chunk_entries--;
chunk_entry_size = get_chunk_entry_size(res_actual_size,
if (chunk_entry_size == 4) {
aliased_le32_t *entries = (aliased_le32_t*)ctx->chunk_csizes;
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS) {
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS) {
for (size_t i = 0; i < actual_num_chunk_entries; i++)
entries[i] = cpu_to_le32(ctx->chunk_csizes[i]);
} else {
} else {
aliased_le64_t *entries = (aliased_le64_t*)ctx->chunk_csizes;
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS) {
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS) {
for (size_t i = 0; i < actual_num_chunk_entries; i++)
entries[i] = cpu_to_le64(ctx->chunk_csizes[i]);
} else {
u64 res_start_offset;
u64 res_end_offset;
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE) {
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PIPABLE) {
ret = full_write(ctx->out_fd, ctx->chunk_csizes, chunk_table_size);
if (ret)
goto error;
chunk_table_offset = ctx->chunks_start_offset - chunk_table_size;
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS) {
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS) {
struct alt_chunk_table_header_disk hdr;
hdr.res_usize = cpu_to_le64(res_actual_size);
list_del(<e->lookup_table_list);
if (lte_new->will_be_in_output_wim)
lte_new->out_refcnt += lte->out_refcnt;
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS)
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS)
ctx->cur_write_res_size -= lte->size;
free_lookup_table_entry(lte);
return BEGIN_STREAM_STATUS_SKIP_STREAM;
struct wim_lookup_table_entry, write_streams_list);
if (ctx->cur_write_res_offset == 0 &&
- !(ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS))
+ !(ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS))
{
/* Starting to write a new stream in non-packed mode. */
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE) {
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PIPABLE) {
int additional_reshdr_flags = 0;
if (ctx->compressor != NULL)
additional_reshdr_flags |= WIM_RESHDR_FLAG_COMPRESSED;
/* If writing a pipable WIM, before the chunk data write a chunk
* header that provides the compressed chunk size. */
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE) {
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PIPABLE) {
struct pwm_chunk_hdr chunk_hdr = {
.compressed_size = cpu_to_le32(csize),
};
usize, false, lte);
if (ctx->cur_write_res_offset == ctx->cur_write_res_size &&
- !(ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS))
+ !(ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS))
{
struct wim_lookup_table_entry *lte;
const u8 *resized_chunk;
size_t needed_chunk_size;
- if (ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS) {
+ if (ctx->write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS) {
needed_chunk_size = ctx->out_chunk_size;
} else {
u64 res_bytes_remaining;
out_offset_in_wim += sizeof(struct pwm_stream_hdr);
}
in_fd = &in_rspec->wim->in_fd;
- while (cur_read_offset != end_read_offset) {
+ wimlib_assert(cur_read_offset != end_read_offset);
+ do {
bytes_to_read = min(sizeof(buf), end_read_offset - cur_read_offset);
return ret;
cur_read_offset += bytes_to_read;
- }
+
+ } while (cur_read_offset != end_read_offset);
list_for_each_entry(lte, &in_rspec->stream_list, rspec_node) {
if (lte->will_be_in_output_wim) {
* file being written. */
static int
write_raw_copy_resources(struct list_head *raw_copy_resources,
- struct filedes *out_fd)
+ struct filedes *out_fd,
+ struct write_streams_progress_data *progress_data)
{
struct wim_lookup_table_entry *lte;
int ret;
ret = write_raw_copy_resource(lte->rspec, out_fd);
if (ret)
return ret;
+ do_write_streams_progress(progress_data, lte->size, false, lte);
}
return 0;
}
}
}
+/*
+ * Write a list of streams to the output WIM file.
+ *
+ * @stream_list
+ * The list of streams to write, specifies a list of `struct
+ * wim_lookup_table_entry's linked by the 'write_streams_list' member.
+ *
+ * @out_fd
+ * The file descriptor, opened for writing, to which to write the streams.
+ *
+ * @write_resource_flags
+ * Flags to modify how the streams are written:
+ *
+ * WRITE_RESOURCE_FLAG_RECOMPRESS:
+ * Force compression of all resources, even if they could otherwise
+ * be re-used by caping the raw data, due to being located in a WIM
+ * file with compatible compression parameters.
+ *
+ * WRITE_RESOURCE_FLAG_PIPABLE:
+ * Write the resources in the wimlib-specific pipable format, and
+ * furthermore do so in such a way that no seeking backwards in
+ * @out_fd will be performed (so it may be a pipe, contrary to the
+ * default behavior).
+ *
+ * WRITE_RESOURCE_FLAG_PACK_STREAMS:
+ * Pack all the streams into a single resource rather than writing
+ * them in separate resources. This format is only valid if the
+ * WIM version number is WIM_VERSION_PACKED_STREAMS. This flag
+ * currently may not be combined with WRITE_RESOURCE_FLAG_PIPABLE.
+ *
+ * @out_ctype
+ * Compression format to use to write the output streams, specified as one
+ * of the WIMLIB_COMPRESSION_TYPE_* constants, excepting
+ * WIMLIB_COMPRESSION_TYPE_INVALID but including
+ * WIMLIB_COMPRESSION_TYPE_NONE.
+ *
+ * @out_chunk_size
+ * Chunk size to use to write the streams. It must be a valid chunk size
+ * for the specified compression format @out_ctype, unless @out_ctype is
+ * WIMLIB_COMPRESSION_TYPE_NONE, in which case this parameter is ignored.
+ *
+ * @num_threads
+ * Number of threads to use to compress data. If 0, a default number of
+ * threads will be chosen. The number of threads still may be decreased
+ * from the specified value if insufficient memory is detected.
+ *
+ * @lookup_table
+ * If on-the-fly deduplication of unhashed streams is desired, this
+ * parameter must be pointer to the lookup table for the WIMStruct on whose
+ * behalf the streams are being written. Otherwise, this parameter can be
+ * NULL.
+ *
+ * @filter_ctx
+ * If on-the-fly deduplication of unhashed streams is desired, this
+ * parameter can be a pointer to a context for stream filtering used to
+ * detect whether the duplicate stream has been hard-filtered or not. If
+ * no streams are hard-filtered or no streams are unhashed, this parameter
+ * can be NULL.
+ *
+ * @comp_ctx
+ * A location in which to allocate the pointer to the default LZX
+ * compression context. This will only be used if @out_ctype is
+ * WIMLIB_COMPRESSION_TYPE_LZX.
+ *
+ * @progress_func
+ * If non-NULL, a progress function that will be called periodically with
+ * WIMLIB_PROGRESS_MSG_WRITE_STREAMS messages. Note that on-the-fly
+ * deduplication of unhashed streams may result in the total bytes provided
+ * in the progress data to decrease from one message to the next.
+ *
+ * This function will write the streams in @stream_list to resources in
+ * consecutive positions in the output WIM file, or to a single packed resource
+ * if WRITE_RESOURCE_FLAG_PACK_STREAMS was specified in @write_resource_flags.
+ * In both cases, the @out_reshdr of the `struct wim_lookup_table_entry' for
+ * each stream written will be updated to specify its location, size, and flags
+ * in the output WIM. In the packed resource case,
+ * WIM_RESHDR_FLAG_PACKED_STREAMS shall be set in the @flags field of the
+ * @out_reshdr, and @out_res_offset_in_wim and @out_res_size_in_wim will also
+ * be set to the offset and size, respectively, in the output WIM of the full
+ * packed resource containing the corresponding stream.
+ *
+ * Each of the streams to write may be in any location supported by the
+ * resource-handling code (specifically, read_stream_list()), such as the
+ * contents of external file that has been logically added to the output WIM, or
+ * a stream in another WIM file that has been imported, or even stream in the
+ * "same" WIM file of which a modified copy is being written. In the case that
+ * a stream is already in a WIM file and uses compatible compression parameters,
+ * by default this function will re-use the raw data instead of decompressing
+ * it, then recompressing it; however, with WRITE_RESOURCE_FLAG_RECOMPRESS
+ * specified in @write_resource_flags, this is not done.
+ *
+ * As a further requirement, this function requires that the
+ * @will_be_in_output_wim member be set on all streams in @stream_list as well
+ * as any other streams not in @stream_list that will be in the output WIM file,
+ * but not on any other streams in the output WIM's lookup table or sharing a
+ * packed resource with a stream in @stream_list. Still furthermore, if
+ * on-the-fly deduplication of streams is possible, then all streams in
+ * @stream_list must also be linked by @lookup_table_list along with any other
+ * streams that have @will_be_in_output_wim set.
+ *
+ * This function handles on-the-fly deduplication of streams for which SHA1
+ * message digests have not yet been calculated and it is therefore known
+ * whether such streams are already in @stream_list or in the WIM's lookup table
+ * at all. If @lookup_table is non-NULL, then each stream in @stream_list that
+ * has @unhashed set but not @unique_size set is checksummed immediately before
+ * it would otherwise be read for writing in order to determine if it is
+ * identical to another stream already being written or one that would be
+ * filtered out of the output WIM using stream_filtered() with the context
+ * @filter_ctx. Each such duplicate stream will be removed from @stream_list, its
+ * reference count transfered to the pre-existing duplicate stream, its memory
+ * freed, and will not be written. Alternatively, if a stream in @stream_list
+ * is a duplicate with any stream in @lookup_table that has not been marked for
+ * writing or would not be hard-filtered, it is freed and the pre-existing
+ * duplicate is written instead, taking ownership of the reference count and
+ * slot in the @lookup_table_list.
+ *
+ * Returns 0 if all streams were written successfully (or did not need to be
+ * written); otherwise a non-zero error code.
+ */
static int
write_stream_list(struct list_head *stream_list,
struct filedes *out_fd,
struct write_streams_ctx ctx;
struct list_head raw_copy_resources;
+ wimlib_assert((write_resource_flags &
+ (WRITE_RESOURCE_FLAG_PACK_STREAMS |
+ WRITE_RESOURCE_FLAG_PIPABLE)) !=
+ (WRITE_RESOURCE_FLAG_PACK_STREAMS |
+ WRITE_RESOURCE_FLAG_PIPABLE));
+
remove_zero_length_streams(stream_list);
if (list_empty(stream_list)) {
ctx.write_resource_flags = write_resource_flags;
ctx.filter_ctx = filter_ctx;
- if (out_chunk_size <= STACK_MAX) {
- ctx.chunk_buf = alloca(out_chunk_size);
- } else {
- ctx.chunk_buf = MALLOC(out_chunk_size);
- if (ctx.chunk_buf == NULL) {
- ret = WIMLIB_ERR_NOMEM;
- goto out_destroy_context;
+ if (out_chunk_size != 0) {
+ if (out_chunk_size <= STACK_MAX) {
+ ctx.chunk_buf = alloca(out_chunk_size);
+ } else {
+ ctx.chunk_buf = MALLOC(out_chunk_size);
+ if (ctx.chunk_buf == NULL) {
+ ret = WIMLIB_ERR_NOMEM;
+ goto out_destroy_context;
+ }
}
}
ctx.chunk_buf_filled = 0;
* bytes needing to be compressed is less 2000000 (heuristic value). */
if (out_ctype != WIMLIB_COMPRESSION_TYPE_NONE) {
+ if (out_ctype == WIMLIB_COMPRESSION_TYPE_LZMS &&
+ ctx.lookup_table != NULL) {
+ WARNING("LZMS compression not implemented; data will "
+ "actually be written uncompressed.");
+ }
+
if (ctx.num_bytes_to_compress >= 2000000) {
ret = new_parallel_chunk_compressor(out_ctype,
out_chunk_size,
&ctx.progress_data.progress);
}
- if (write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS) {
+ if (write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS) {
ret = begin_write_resource(&ctx, ctx.num_bytes_to_compress);
if (ret)
goto out_destroy_context;
if (ret)
goto out_destroy_context;
- if (write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS) {
+ if (write_resource_flags & WRITE_RESOURCE_FLAG_PACK_STREAMS) {
struct wim_reshdr reshdr;
struct wim_lookup_table_entry *lte;
u64 offset_in_res;
out_write_raw_copy_resources:
/* Copy any compressed resources for which the raw data can be reused
* without decompression. */
- ret = write_raw_copy_resources(&raw_copy_resources, ctx.out_fd);
+ ret = write_raw_copy_resources(&raw_copy_resources, ctx.out_fd,
+ &ctx.progress_data);
out_destroy_context:
if (out_chunk_size > STACK_MAX)
lte->will_be_in_output_wim = 1;
return write_stream_list(&stream_list,
out_fd,
- write_resource_flags & ~WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS,
+ write_resource_flags & ~WRITE_RESOURCE_FLAG_PACK_STREAMS,
out_ctype,
out_chunk_size,
1,
lte->size = buf_size;
lte->flags = reshdr_flags;
- if (write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE) {
+ if (write_resource_flags & WRITE_RESOURCE_FLAG_PIPABLE) {
sha1_buffer(buf, buf_size, lte->hash);
lte->unhashed = 0;
} else {
write_resource_flags = write_flags_to_resource_flags(write_flags);
- write_resource_flags &= ~WIMLIB_WRITE_RESOURCE_FLAG_PACK_STREAMS;
+ write_resource_flags &= ~WRITE_RESOURCE_FLAG_PACK_STREAMS;
DEBUG("Writing metadata resources (offset=%"PRIu64")",
wim->out_fd.offset);
/* Write extra copy of the XML data. */
ret = write_wim_xml_data(wim, image, WIM_TOTALBYTES_OMIT,
&xml_reshdr,
- WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE);
+ WRITE_RESOURCE_FLAG_PIPABLE);
if (ret)
return ret;
WIMLIB_WRITE_FLAG_PACK_STREAMS))
== (WIMLIB_WRITE_FLAG_PIPABLE |
WIMLIB_WRITE_FLAG_PACK_STREAMS))
+ {
+ ERROR("Cannot specify both PIPABLE and PACK_STREAMS!");
return WIMLIB_ERR_INVALID_PARAM;
+ }
/* Set appropriate magic number. */
if (write_flags & WIMLIB_WRITE_FLAG_PIPABLE)
DEBUG("Overwriting `%"TS"' in-place", wim->filename);
+ /* Save original header so it can be restored in case of error */
+ memcpy(&hdr_save, &wim->hdr, sizeof(struct wim_header));
+
/* Set default integrity flag. */
if (!(write_flags & (WIMLIB_WRITE_FLAG_CHECK_INTEGRITY |
WIMLIB_WRITE_FLAG_NO_CHECK_INTEGRITY)))
/* Set default packed flag. */
if (!(write_flags & (WIMLIB_WRITE_FLAG_PACK_STREAMS |
WIMLIB_WRITE_FLAG_NO_PACK_STREAMS)))
+ {
+ #if 0
if (wim->hdr.wim_version == WIM_VERSION_PACKED_STREAMS)
write_flags |= WIMLIB_WRITE_FLAG_PACK_STREAMS;
+ #endif
+ /* wimlib allows multiple packs in a single WIM, but they don't
+ * seem to be compatible with WIMGAPI. Write new streams
+ * unpacked. */
+ } else if (write_flags & WIMLIB_WRITE_FLAG_PACK_STREAMS) {
+ wim->hdr.wim_version = WIM_VERSION_PACKED_STREAMS;
+ }
/* Set additional flags for overwrite. */
write_flags |= WIMLIB_WRITE_FLAG_OVERWRITE |
if (wim->hdr.integrity_table_reshdr.offset_in_wim != 0 &&
wim->hdr.integrity_table_reshdr.offset_in_wim < old_xml_end) {
WARNING("Didn't expect the integrity table to be before the XML data");
- return WIMLIB_ERR_RESOURCE_ORDER;
+ ret = WIMLIB_ERR_RESOURCE_ORDER;
+ goto out_restore_memory_hdr;
}
if (old_lookup_table_end > old_xml_begin) {
WARNING("Didn't expect the lookup table to be after the XML data");
- return WIMLIB_ERR_RESOURCE_ORDER;
+ ret = WIMLIB_ERR_RESOURCE_ORDER;
+ goto out_restore_memory_hdr;
}
/* Set @old_wim_end, which indicates the point beyond which we don't
ret = check_resource_offsets(wim, old_wim_end);
if (ret)
- return ret;
+ goto out_restore_memory_hdr;
ret = prepare_stream_list_for_write(wim, WIMLIB_ALL_IMAGES, write_flags,
&stream_list, &lookup_table_list,
&filter_ctx);
if (ret)
- return ret;
+ goto out_restore_memory_hdr;
ret = open_wim_writable(wim, wim->filename, O_RDWR);
if (ret)
- return ret;
+ goto out_restore_memory_hdr;
ret = lock_wim(wim, wim->out_fd.fd);
if (ret)
goto out_close_wim;
- /* Save original header so it can be restored in case of error */
- memcpy(&hdr_save, &wim->hdr, sizeof(struct wim_header));
-
/* Set WIM_HDR_FLAG_WRITE_IN_PROGRESS flag in header. */
wim->hdr.flags |= WIM_HDR_FLAG_WRITE_IN_PROGRESS;
ret = write_wim_header_flags(wim->hdr.flags, &wim->out_fd);
if (ret) {
ERROR_WITH_ERRNO("Error updating WIM header flags");
- goto out_restore_memory_hdr;
+ goto out_unlock_wim;
}
if (filedes_seek(&wim->out_fd, old_wim_end) == -1) {
if (ret)
goto out_truncate;
- goto out_unlock_wim;
+ wim->wim_locked = 0;
+ return 0;
out_truncate:
if (!(write_flags & WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE)) {
}
out_restore_physical_hdr:
(void)write_wim_header_flags(hdr_save.flags, &wim->out_fd);
-out_restore_memory_hdr:
- memcpy(&wim->hdr, &hdr_save, sizeof(struct wim_header));
-out_close_wim:
- (void)close_wim_writable(wim, write_flags);
out_unlock_wim:
wim->wim_locked = 0;
+out_close_wim:
+ (void)close_wim_writable(wim, write_flags);
+out_restore_memory_hdr:
+ memcpy(&wim->hdr, &hdr_save, sizeof(struct wim_header));
return ret;
}
return 0;
}
+/* Determine if the specified WIM file may be updated by appending in-place
+ * rather than writing and replacing it with an entirely new file. */
static bool
can_overwrite_wim_inplace(const WIMStruct *wim, int write_flags)
{
+ /* REBUILD flag forces full rebuild. */
if (write_flags & WIMLIB_WRITE_FLAG_REBUILD)
return false;
+ /* Deletions cause full rebuild by default. */
if (wim->deletion_occurred && !(write_flags & WIMLIB_WRITE_FLAG_SOFT_DELETE))
return false;
+ /* Pipable WIMs cannot be updated in place, nor can a non-pipable WIM be
+ * turned into a pipable WIM in-place. */
if (wim_is_pipable(wim) || (write_flags & WIMLIB_WRITE_FLAG_PIPABLE))
return false;
- if (wim->hdr.wim_version != WIM_VERSION_PACKED_STREAMS) {
- if (wim->compression_type != wim->out_compression_type)
- return false;
- if (wim->chunk_size != wim->out_chunk_size)
- return false;
- } else {
- if (write_flags & WIMLIB_WRITE_FLAG_NO_PACK_STREAMS)
- return false;
- }
+ /* wimlib allows multiple packs in a single WIM, but they don't seem to
+ * be compatible with WIMGAPI, so force all streams to be repacked if
+ * the WIM already may have contained a pack and PACK_STREAMS was
+ * requested. */
+ if (write_flags & WIMLIB_WRITE_FLAG_PACK_STREAMS &&
+ wim->hdr.wim_version == WIM_VERSION_PACKED_STREAMS)
+ return false;
+
+ /* The default compression type and compression chunk size selected for
+ * the output WIM must be the same as those currently used for the WIM.
+ */
+ if (wim->compression_type != wim->out_compression_type)
+ return false;
+ if (wim->chunk_size != wim->out_chunk_size)
+ return false;
return true;
}
git://wimlib.net / wimlib / blobdiff