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# [HDiffPatch](https://github.com/sisong/HDiffPatch)
# [HDiffPatch]
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english | [中文版](README_cn.md)

a C\C++ library and command-line tools for Diff & Patch between binary files or directories(folder); cross-platform; runs fast; create small delta/differential; support large files and limit memory requires when diff & patch.
[HDiffPatch] is a C\C++ library and command-line tools for **diff** & **patch** between binary files or directories(folder); cross-platform; runs fast; create small delta/differential; support large files and limit memory requires when diff & patch.

HDiffPatch defines its own patch file format, this lib is also compatible with the [bsdiff4](https://daemonology.net/bsdiff) patch format and partially compatible with the [open-vcdiff](https://github.com/google/open-vcdiff) and [xdelta3](https://github.com/jmacd/xdelta) patch file format VCDIFF(RFC 3284).

if need patch (OTA) on embedded systems,MCU,NB-IoT..., see demo [HPatchLite](https://github.com/sisong/HPatchLite) (+ [tinyuz](https://github.com/sisong/tinyuz)), can run on 1KB RAM devices!
[HDiffPatch] defines its own patch file format, this lib is also compatible with the [bsdiff4] patch file format and partially compatible with the [open-vcdiff] and [xdelta3] patch file format [VCDIFF(RFC 3284)].

update your own Android Apk? Jar or Zip file diff & patch? try [ApkDiffPatch](https://github.com/sisong/ApkDiffPatch), to create smaller delta/differential! NOTE: *ApkDiffPath can't be used by Android app store, because it requires re-signing apks before diff.*
if need patch (OTA) on embedded systems,MCU,NB-IoT..., see demo [HPatchLite], +[tinyuz] decompressor can run on 1KB RAM devices!

[sfpatcher](https://github.com/sisong/sfpatcher) not require re-signing apks (like [archive-patcher](https://github.com/google/archive-patcher)), is designed for Android app store, patch speed up by a factor of xx than archive-patcher & run with O(1) memory.
update your own Android Apk? Jar or Zip file diff & patch? try [ApkDiffPatch], to create smaller delta/differential! NOTE: *ApkDiffPath can't be used by Android app store, because it requires re-signing apks before diff.*

if you not have the old versions(too many or not obtain or have been modified), thus cannot create the delta in advance. you can see demo [hsynz](https://github.com/sisong/hsynz) (like [zsync](http://zsync.moria.org.uk)), the new version is only need released once and the owners of the old version get the information about the new version and do the diff&patch themselves. hsynz support zstd compressor & run faster than zsync.
[sfpatcher] not require re-signing apks (like [archive-patcher]), is designed for Android app store, patch speed up by a factor of xx than archive-patcher & run with O(1) memory.

if you not have the old versions(too many or not obtain or have been modified), thus cannot create the delta in advance. you can see sync demo [hsynz] (like [zsync]), the new version is only need released once and the owners of the old version get the information about the new version and do the diff&patch themselves. hsynz support zstd compressor & run faster than zsync.

NOTE: *This library does not deal with file metadata, such as file last wirte time, permissions, link file, etc... To this library, a file is just as a stream of bytes; You can extend this library or use other tools.*


[HDiffPatch]: https://github.com/sisong/HDiffPatch
[hsynz]: https://github.com/sisong/hsynz
[ApkDiffPatch]: https://github.com/sisong/ApkDiffPatch
[sfpatcher]: https://github.com/sisong/sfpatcher
[HPatchLite]: https://github.com/sisong/HPatchLite
[tinyuz]: https://github.com/sisong/tinyuz
[bsdiff4]: http://www.daemonology.net/bsdiff/
[xdelta3]: https://github.com/jmacd/xdelta
[open-vcdiff]: https://github.com/google/open-vcdiff
[archive-patcher]: https://github.com/google/archive-patcher
[zsync]: http://zsync.moria.org.uk
[VCDIFF(RFC 3284)]: https://www.rfc-editor.org/rfc/rfc3284

---
## Releases/Binaries
[Download from latest release](https://github.com/sisong/HDiffPatch/releases) : Command line app for Windows, Linux, MacOS; and .so patch lib for Android.
( release files build by projects in path `HDiffPatch/builds` )
[Download from latest release](https://github.com/sisong/HDiffPatch/releases) : Command line app for Windows, Linux, MacOS; and .so patch lib for Android.
use cmdline to create a delta:
`$hdiffz -m-6 -SD -c-zstd-21-24 -d oldPath newPath outDiffFile`
if file is very large, try changing `-m-6` to `-s-64`
Expand All @@ -37,10 +50,12 @@ apply the delta:
### Linux or MacOS X ###
Try:
`$ make LZMA=0 ZSTD=0 MD5=0`
bzip2 : if the build fails with `fatal error: bzlib.h: No such file or directory`, use your system's package manager to install the libbz2 package and try again. install bzip2: `$ apt-get install libbz2` or `$ sudo apt-get install libbz2-dev` or `$ yum -y install bzip2` or `$ brew install bzip2` ...
Alternatively, get the optional library headers (+bzip2 library) and build completely: `$ git clone https://github.com/sisong/bzip2.git ../bzip2 && pushd ../bzip2 && make && sudo make install && popd`

if need lzma zstd md5 support, Try:
bzip2 : if the build fails with `fatal error: bzlib.h: No such file or directory`, use your system's package manager to install the libbz2 package and try again; or download & make with libbz2 source code:
```
$ git clone https://github.com/sisong/bzip2.git ../bzip2
$ make LZMA=0 ZSTD=0 MD5=0 BZIP2=1
```
if need lzma zstd & md5 support, Try:
```
$ git clone https://github.com/sisong/libmd5.git ../libmd5
$ git clone https://github.com/sisong/lzma.git ../lzma
Expand All @@ -67,7 +82,6 @@ $ git clone https://github.com/sisong/bzip2.git ../bzip2


---
### command line usage Chinese version: [命令行使用说明中文版](README_cmdline_cn.md)

## **diff** command line usage:
diff usage: **hdiffz** [options] **oldPath newPath outDiffFile**
Expand Down Expand Up @@ -282,7 +296,7 @@ all **diff**&**patch** function in file: `libHDiffPatch/HDiff/diff.h` & `libHDif
* **patch_single_stream_mem()**
* **patch_single_compressed_diff()**
* **patch_single_stream_diff()**
#### hpatch lite API, optimized hpatch on MCU,NB-IoT... (demo [HPatchLite](https://github.com/sisong/HPatchLite)):
#### hpatch lite API, optimized hpatch on MCU,NB-IoT... (demo [HPatchLite]):
* **create_lite_diff()**
* **hpatch_lite_open()**
* **hpatch_lite_patch()**
Expand All @@ -294,7 +308,7 @@ all **diff**&**patch** function in file: `libHDiffPatch/HDiff/diff.h` & `libHDif
* **create_vcdiff()**
* **create_vcdiff_stream()**
* **vcpatch_with_cache()**
#### hsynz API, diff&patch by sync (demo [hsynz](https://github.com/sisong/hsynz)):
#### hsynz API, diff&patch by sync (demo [hsynz]):
* **create_sync_data()**
* **create_dir_sync_data()**
* **sync_patch()**
Expand All @@ -305,7 +319,7 @@ all **diff**&**patch** function in file: `libHDiffPatch/HDiff/diff.h` & `libHDif
* **sync_local_patch_...()**

---
## HDiffPatch vs BsDiff & xdelta:
## [HDiffPatch] vs [bsdiff4] & [xdelta3]:
case list([download from OneDrive](https://1drv.ms/u/s!Aj8ygMPeifoQgUIZxYac5_uflNoN)):
| |newFile <-- oldFile|newSize|oldSize|
|----:|:----|----:|----:|
Expand Down Expand Up @@ -447,8 +461,8 @@ case list:
**sfpatcher -1 zstd** v1.1.1 diff with `-o-1 -c-zstd-21-23 -m-1 -step-3m -lp-512k -p-8 -cache -d {old} {new} {pat}`
**sfpatcher -2 lzma2** diff with `-o-2 -c-lzma2-9-4m -m-1 -step-2m -lp-8m -p-8 -cache -d {old} {new} {pat}`
sfpatcher patch with `-lp -p-8 {old} {pat} {new}`
adding test hpatchz&hsynz&sfpatcher on Android, CPU Kirin980(2×A76 2.6G + 2×A76 1.92G + 4×A55 1.8G)
( [archive-patcher](https://github.com/google/archive-patcher), [sfpatcher](https://github.com/sisong/sfpatcher) optimized diff&patch between apk files )
adding test hpatchz&hsynz&sfpatcher on Android, arm CPU Kirin980(2×A76 2.6G + 2×A76 1.92G + 4×A55 1.8G)
( [archive-patcher], [sfpatcher] optimized diff&patch between apk files )

**test result average**:
|Program|compress|diff mem|speed|patch mem|max mem|speed|arm Kirin980|
Expand Down
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