INTRODUCTION
-This is wimlib version 1.7.2-BETA (August 2014). wimlib is a C library for
+This is wimlib version 1.7.5-BETA (January 2015). wimlib is a C library for
creating, modifying, extracting, and mounting files in the Windows Imaging
Format (WIM files). wimlib and its command-line frontend 'wimlib-imagex'
provide a free and cross-platform alternative to Microsoft's WIMGAPI, ImageX,
implementation in WIMGAPI is included.
=============================================================================
- | Compression || wimlib (v1.7.2-BETA) | WIMGAPI (Windows 8.1) |
+ | Compression || wimlib (v1.7.5-BETA) | WIMGAPI (Windows 8.1) |
=============================================================================
- | None [1] || 361,404,682 in 3.4s | 361,364,994 in 4.2s |
- | XPRESS [2] || 138,398,747 in 4.2s | 140,468,002 in 5.1s |
- | XPRESS (slow) [3] || 135,284,950 in 10.3s | N/A |
- | LZX (quick) [4] || 131,861,913 in 4.7s | N/A |
- | LZX (normal) [5] || 126,855,247 in 14.9s | 127,301,774 in 18.2s |
- | LZX (slow) [6] || 126,245,561 in 32.1s | N/A |
- | LZMS (non-solid) [7] || 122,126,328 in 16.4s | N/A |
- | LZMS (solid) [8] || 93,795,440 in 47.4s | 88,789,426 in 96.8s |
- | "WIMBoot" [9] || 167,121,495 in 5.3s | 169,124,968 in 9.3s |
- | "WIMBoot" (slow) [10] || 165,219,818 in 9.4s | N/A |
+ | None [1] || 361,314,224 in 2.4s | 361,315,338 in 4.5s |
+ | XPRESS [2] || 138,218,750 in 3.0s | 140,457,436 in 6.0s |
+ | XPRESS (slow) [3] || 135,173,511 in 8.9s | N/A |
+ | LZX (quick) [4] || 130,207,195 in 3.8s | N/A |
+ | LZX (normal) [5] || 126,522,539 in 10.4s | 127,293,240 in 19.2s |
+ | LZX (slow) [6] || 126,042,313 in 17.3s | N/A |
+ | LZMS (non-solid) [7] || 121,909,792 in 11.9s | N/A |
+ | LZMS (solid) [8] || 93,650,936 in 45.0s | 88,771,192 in 109.2 |
+ | "WIMBoot" [9] || 167,023,719 in 3.5s | 169,109,211 in 10.4s |
+ | "WIMBoot" (slow) [10] || 165,027,583 in 7.9s | N/A |
=============================================================================
Notes:
The compression ratio provided by wimlib is also competitive with commonly used
archive formats. Below are file sizes that result when the Canterbury corpus is
-compressed with wimlib (v1.7.0), WIMGAPI (Windows 8), and some other
+compressed with wimlib (v1.7.2), WIMGAPI (Windows 8.1), and some other
formats/programs:
- =================================================
- | Format | Size (bytes) |
- =================================================
- | tar | 2,826,240 |
- | WIM (WIMGAPI, None) | 2,814,278 |
- | WIM (wimlib, None) | 2,813,856 |
- | WIM (WIMGAPI, XPRESS) | 825,410 |
- | WIM (wimlib, XPRESS) | 792,024 |
- | tar.gz (gzip, default) | 738,796 |
- | ZIP (Info-ZIP, default) | 735,334 |
- | tar.gz (gzip, -9) | 733,971 |
- | ZIP (Info-ZIP, -9) | 732,297 |
- | WIM (wimlib, LZX quick) | 722,196 |
- | WIM (WIMGAPI, LZX) | 651,766 |
- | WIM (wimlib, LZX normal) | 649,204 |
- | WIM (wimlib, LZX slow) | 639,618 |
- | WIM (wimlib, LZMS non-solid) | 592,136 |
- | tar.bz2 (bzip, default) | 565,008 |
- | tar.bz2 (bzip, -9) | 565,008 |
- | WIM (wimlib, LZMS solid) | 525,270 |
- | WIM (wimlib, LZMS solid, slow) | 521,700 |
- | WIM (WIMGAPI, LZMS solid) | 521,232 |
- | tar.xz (xz, default) | 486,916 |
- | tar.xz (xz, -9) | 486,904 |
- | 7z (7-zip, default) | 484,700 |
- | 7z (7-zip, -9) | 483,239 |
- =================================================
+ =====================================================
+ | Format | Size (bytes) |
+ =====================================================
+ | tar | 2,826,240 |
+ | WIM (WIMGAPI, None) | 2,814,254 |
+ | WIM (wimlib, None) | 2,814,216 |
+ | WIM (WIMGAPI, XPRESS) | 825,536 |
+ | WIM (wimlib, XPRESS) | 789,296 |
+ | tar.gz (gzip, default) | 738,796 |
+ | ZIP (Info-ZIP, default) | 735,334 |
+ | tar.gz (gzip, -9) | 733,971 |
+ | ZIP (Info-ZIP, -9) | 732,297 |
+ | WIM (wimlib, LZX quick) | 690,110 |
+ | WIM (WIMGAPI, LZX) | 651,866 |
+ | WIM (wimlib, LZX normal) | 624,634 |
+ | WIM (wimlib, LZX slow) | 620,728 |
+ | WIM (wimlib, LZMS non-solid) | 581,960 |
+ | tar.bz2 (bzip, default) | 565,008 |
+ | tar.bz2 (bzip, -9) | 565,008 |
+ | WIM (wimlib, LZX solid) | 527,688 |
+ | WIM (wimlib, LZMS solid) | 525,990 |
+ | WIM (wimlib, LZMS solid, slow) | 523,728 |
+ | WIM (wimlib, LZX solid, slow) | 522,042 |
+ | WIM (WIMGAPI, LZMS solid) | 521,366 |
+ | WIM (wimlib, LZX solid, very slow) | 519,546 |
+ | tar.xz (xz, default) | 486,916 |
+ | tar.xz (xz, -9) | 486,904 |
+ | 7z (7-zip, default) | 484,700 |
+ | 7z (7-zip, -9) | 483,239 |
+ =====================================================
Note: WIM does even better on directory trees containing duplicate files, which
the Canterbury corpus doesn't have.
mode), to ensure a fast and feature-rich implementation of each platform/mode.
wimlib is mainly used on x86 and x86_64 CPUs, but it should also work on a
-number of other GCC-supported 32-bit or 64-bit architectures. No assumptions
-are made about endianness, but some code assumes that unaligned memory accesses
-are supported and relatively efficient.
+number of other GCC-supported 32-bit or 64-bit architectures. It has been
+tested on the ARM architecture.
Currently, gcc and clang are the only supported compilers. A few nonstandard
extensions are used in the code.
neither of which is completely applicable to its use in the WIM format, and
the first of which contains multiple errors.
- There does not seem to be any official documentation for LZMS, so my comments
- and code in src/lzms-decompress.c may in fact be the best documentation
+ and code in src/lzms_decompress.c may in fact be the best documentation
available for this particular compression format.
The algorithms used by wimlib's compression and decompression codecs are
git://wimlib.net / wimlib / blobdiff