* library clients looking to make use of wimlib's compression code for another
* purpose.
*
+ * @param window_size
+ * Size of the LZX window. Must be a power of 2 between 2^15 and 2^21,
+ * inclusively.
+ *
* @param params
* Compression parameters to use, or @c NULL to use the default parameters.
*
* @return 0 on success; nonzero on error.
*
* @retval ::WIMLIB_ERR_INVALID_PARAM
- * The compression parameters were invalid.
+ * The window size or compression parameters were invalid.
* @retval ::WIMLIB_ERR_NOMEM
* Not enough memory to allocate the compression context.
*/
extern int
-wimlib_lzx_alloc_context(const struct wimlib_lzx_params *params,
+wimlib_lzx_alloc_context(uint32_t window_size,
+ const struct wimlib_lzx_params *params,
struct wimlib_lzx_context **ctx_pp);
/**
wimlib_lzx_decompress(const void *compressed_data, unsigned compressed_len,
void *uncompressed_data, unsigned uncompressed_len);
+extern int
+wimlib_lzx_decompress2(const void *compressed_data, unsigned compressed_len,
+ void *uncompressed_data, unsigned uncompressed_len,
+ uint32_t max_window_size);
+
/**
* @ingroup G_compression
*
wimlib_set_image_descripton(WIMStruct *wim, int image,
const wimlib_tchar *description);
+/**
+ * @ingroup G_writing_and_overwriting_wims
+ *
+ * Set the compression chunk size of a WIM to use in subsequent calls to
+ * wimlib_write() or wimlib_overwrite().
+ *
+ * A compression chunk size will result in a greater compression ratio, but the
+ * speed of random access to the WIM will be reduced, and the effect of an
+ * increased compression chunk size is limited by the size of each file being
+ * compressed.
+ *
+ * <b>WARNING: Changing the compression chunk size to any value other than the
+ * default of 32768 bytes eliminates compatibility with Microsoft's software,
+ * except when increasing the XPRESS chunk size before Windows 8.</b>
+ *
+ * @param wim
+ * ::WIMStruct for a WIM.
+ * @param out_chunk_size
+ * The chunk size (in bytes) to set. The valid chunk sizes are dependent
+ * on the compression format. The XPRESS compression format supports chunk
+ * sizes that are powers of 2 with exponents between 15 and 26 inclusively,
+ * whereas the LZX compression format supports chunk sizes that are powers
+ * of 2 with exponents between 15 and 21 inclusively.
+ *
+ * @return 0 on success; nonzero on error.
+ *
+ * @retval ::WIMLIB_ERR_INVALID_CHUNK_SIZE
+ * @p ctype is not a supported chunk size.
+ */
+extern int
+wimlib_set_output_chunk_size(WIMStruct *wim, uint32_t chunk_size);
+
+/**
+ * @ingroup G_writing_and_overwriting_wims
+ *
+ * Set the compression type of a WIM to use in subsequent calls to
+ * wimlib_write() or wimlib_overwrite().
+ *
+ * @param wim
+ * ::WIMStruct for a WIM.
+ * @param ctype
+ * The compression type to set (one of ::wimlib_compression_type). If this
+ * compression type is incompatible with the current output chunk size
+ * (either the default or as set with wimlib_set_output_chunk_size()), the
+ * output chunk size is reset to the default for that compression type.
+ *
+ * @return 0 on success; nonzero on error.
+ *
+ * @retval ::WIMLIB_ERR_INVALID_PARAM
+ * @p ctype did not specify a valid compression type.
+ */
+extern int
+wimlib_set_output_compression_type(WIMStruct *wim, int ctype);
+
/**
* @ingroup G_modifying_wims
*
/**
* @ingroup G_compression
*
- * This function is equivalent to wimlib_lzx_compress(), but instead compresses
- * the data using "XPRESS" compression.
+ * Compress a chunk of data using XPRESS compression.
+ *
+ * This function is exported for convenience only and should only be used by
+ * library clients looking to make use of wimlib's compression code for another
+ * purpose.
+ *
+ * As of wimlib v1.5.4, this function can be used with @p chunk_size greater
+ * than 32768 bytes and is only limited by available memory. However, the
+ * XPRESS format itself still caps match offsets to 65535, so if a larger chunk
+ * size is chosen, then the matching will effectively occur in a sliding window
+ * over it.
+ *
+ * @param chunk
+ * Uncompressed data of the chunk.
+ * @param chunk_size
+ * Size of the uncompressed chunk, in bytes.
+ * @param out
+ * Pointer to output buffer of size at least (@p chunk_size - 1) bytes.
+ *
+ * @return
+ * The size of the compressed data written to @p out in bytes, or 0 if the
+ * data could not be compressed to (@p chunk_size - 1) bytes or fewer.
*/
extern unsigned
wimlib_xpress_compress(const void *chunk, unsigned chunk_size, void *out);
/**
* @ingroup G_compression
*
- * This function is equivalent to wimlib_lzx_decompress(), but instead assumes
- * the data is compressed using "XPRESS" compression.
+ * Decompresses a chunk of XPRESS-compressed data.
+ *
+ * This function is exported for convenience only and should only be used by
+ * library clients looking to make use of wimlib's compression code for another
+ * purpose.
+ *
+ * @param compressed_data
+ * Pointer to the compressed data.
+ *
+ * @param compressed_len
+ * Length of the compressed data, in bytes.
+ *
+ * @param uncompressed_data
+ * Pointer to the buffer into which to write the uncompressed data.
+ *
+ * @param uncompressed_len
+ * Length of the uncompressed data.
+ *
+ * @return
+ * 0 on success; non-zero on failure.
*/
extern int
wimlib_xpress_decompress(const void *compressed_data, unsigned compressed_len,
git://wimlib.net / wimlib / blobdiff