return wim;
}
+/* Determine if the chunk size is valid for the specified compression type. */
+static bool
+wim_chunk_size_valid(u32 chunk_size, int ctype)
+{
+ u32 order;
+
+ /* Chunk size is meaningless for uncompressed WIMs --- any value is
+ * okay. */
+ if (ctype == WIMLIB_COMPRESSION_TYPE_NONE)
+ return true;
+
+ /* Chunk size must be power of 2. */
+ if (chunk_size == 0)
+ return false;
+ order = bsr32(chunk_size);
+ if (chunk_size != 1U << order)
+ return false;
+
+ /* Order Size
+ * ===== ====
+ * 15 32768
+ * 16 65536
+ * 17 131072
+ * 18 262144
+ * 19 524288
+ * 20 1048576
+ * 21 2097152
+ * 22 4194304
+ * 23 8388608
+ * 24 16777216
+ * 25 33554432
+ * 26 67108864
+ */
+ switch (ctype) {
+ case WIMLIB_COMPRESSION_TYPE_LZX:
+ /* For LZX compression, the chunk size corresponds to the LZX
+ * window size, which according the LZX specification can be any
+ * power of 2 between 2^15 and 2^21, inclusively. All these are
+ * supported by wimlib; however, unfortunately only 2^15 is
+ * supported by WIMGAPI[1] so this value is used by default.
+ *
+ * [1] WIMGAPI (Windows 7) attempts to decompress LZX chunk
+ * sizes > 2^15 but seems to have bug(s) that cause it to fail
+ * or crash. (I tried several tweaks to the LZX data but none
+ * resulted in successful decompression.) WIMGAPI (Windows 8)
+ * appears to refuse to open WIMs with chunk size > 2^15
+ * entirely. */
+ return order >= 15 && order <= 21;
+
+ case WIMLIB_COMPRESSION_TYPE_XPRESS:
+ /* WIMGAPI (Windows 7) didn't seem to support XPRESS chunk size
+ * below 32768 bytes, but larger power-of-two sizes appear to be
+ * supported. 67108864 was the largest size that worked.
+ * (Note, however, that the offsets of XPRESS matches are still
+ * limited to 65535 bytes even when a much larger chunk size is
+ * used!)
+ *
+ * WIMGAPI (Windows 8) seemed to have removed the support for
+ * larger XPRESS chunk sizes and will refuse to open such WIMs.
+ *
+ * 2^15 = 32768 is the default value used for compatibility, but
+ * wimlib can actually use up to 2^26. */
+ return order >= 15 && order <= 26;
+ }
+ return false;
+}
+
+/* Return the default chunk size to use for the specified compression type.
+ *
+ * See notes above in wim_chunk_size_valid(). */
+static u32
+wim_default_chunk_size(int ctype)
+{
+ return 32768;
+}
+
/*
* Calls a function on images in the WIM. If @image is WIMLIB_ALL_IMAGES, @visitor
* is called on the WIM once for each image, with each image selected as the
if (!wim)
return WIMLIB_ERR_NOMEM;
- ret = init_wim_header(&wim->hdr, ctype);
+ ret = init_wim_header(&wim->hdr, ctype, wim_default_chunk_size(ctype));
if (ret != 0)
goto out_free;
wim->lookup_table = table;
wim->refcnts_ok = 1;
wim->compression_type = ctype;
+ wim->out_compression_type = ctype;
+ wim->chunk_size = wim->hdr.chunk_size;
+ wim->out_chunk_size = wim->hdr.chunk_size;
*wim_ret = wim;
return 0;
out_free:
info->image_count = wim->hdr.image_count;
info->boot_index = wim->hdr.boot_idx;
info->wim_version = WIM_VERSION;
- info->chunk_size = WIM_CHUNK_SIZE;
+ info->chunk_size = wim->hdr.chunk_size;
info->part_number = wim->hdr.part_number;
info->total_parts = wim->hdr.total_parts;
info->compression_type = wim->compression_type;
return 0;
}
+/* API function documented in wimlib.h */
+WIMLIBAPI int
+wimlib_set_output_compression_type(WIMStruct *wim, int ctype)
+{
+ switch (ctype) {
+ case WIMLIB_COMPRESSION_TYPE_INVALID:
+ break;
+ case WIMLIB_COMPRESSION_TYPE_NONE:
+ case WIMLIB_COMPRESSION_TYPE_LZX:
+ case WIMLIB_COMPRESSION_TYPE_XPRESS:
+ wim->out_compression_type = ctype;
+
+ /* Reset the chunk size if it's no longer valid. */
+ if (!wim_chunk_size_valid(wim->out_chunk_size,
+ wim->out_compression_type))
+ wim->out_chunk_size = wim_default_chunk_size(wim->out_compression_type);
+ return 0;
+ }
+ return WIMLIB_ERR_INVALID_PARAM;
+}
+
+/* API function documented in wimlib.h */
+WIMLIBAPI int
+wimlib_set_output_chunk_size(WIMStruct *wim, uint32_t chunk_size)
+{
+ if (!wim_chunk_size_valid(chunk_size, wim->out_compression_type)) {
+ ERROR("Invalid chunk size (%"PRIu32" bytes) "
+ "for compression type %"TS"!",
+ chunk_size,
+ wimlib_get_compression_type_string(wim->out_compression_type));
+ switch (wim->out_compression_type) {
+ case WIMLIB_COMPRESSION_TYPE_XPRESS:
+ ERROR("Valid chunk sizes for XPRESS are "
+ "32768, 65536, 131072, ..., 67108864.");
+ break;
+ case WIMLIB_COMPRESSION_TYPE_LZX:
+ ERROR("Valid chunk sizes for LZX are "
+ "32768, 65536, 131072, ..., 2097152.");
+ break;
+ }
+ return WIMLIB_ERR_INVALID_CHUNK_SIZE;
+ }
+ if (chunk_size != 32768) {
+ WARNING ("Changing the compression chunk size to any value other than\n"
+ " the default of 32768 bytes eliminates compatibility with\n"
+ " Microsoft's software!");
+ }
+ wim->out_chunk_size = chunk_size;
+ return 0;
+}
+
static int
do_open_wim(const tchar *filename, struct filedes *fd_ret)
{
} else {
wim->compression_type = WIMLIB_COMPRESSION_TYPE_NONE;
}
+ wim->out_compression_type = wim->compression_type;
+
+ /* Check and cache the chunk size. */
+ wim->chunk_size = wim->out_chunk_size = wim->hdr.chunk_size;
+ if (!wim_chunk_size_valid(wim->chunk_size, wim->compression_type)) {
+ ERROR("Invalid chunk size (%"PRIu32" bytes) "
+ "for compression type %"TS"!",
+ wim->chunk_size,
+ wimlib_get_compression_type_string(wim->compression_type));
+ return WIMLIB_ERR_INVALID_CHUNK_SIZE;
+ }
if (open_flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
ret = check_wim_integrity(wim, progress_func);
if (filedes_valid(&wim->out_fd))
filedes_close(&wim->out_fd);
+ wimlib_lzx_free_context(wim->lzx_context);
free_lookup_table(wim->lookup_table);
git://wimlib.net / wimlib / blobdiff