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add --patch-apply command

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as an equivalent for `-d --patch-from`.
Requested by @sergeevabc in #2173.
This commit is contained in:
Yann Collet
2025-03-25 14:23:14 -07:00
parent 12ea5f6e30
commit eb168a0afc
2 changed files with 7 additions and 1 deletions
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4
programs/zstdcli.c
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@@ -230,7 +230,8 @@ static void usageAdvanced(const char* programName)
#endif
DISPLAYOUT(" --adapt Dynamically adapt compression level to I/O conditions.\n");
DISPLAYOUT(" --long[=#] Enable long distance matching with window log #. [Default: %u]\n", g_defaultMaxWindowLog);
DISPLAYOUT(" --patch-from=REF Use REF as the reference point for Zstandard's diff engine. \n\n");
DISPLAYOUT(" --patch-from=REF Use REF as the reference point for Zstandard's diff engine. \n");
DISPLAYOUT(" --patch-apply Equivalent for `-d --patch-from` \n\n");
# ifdef ZSTD_MULTITHREAD
DISPLAYOUT(" -T# Spawn # compression threads. [Default: 1; pass 0 for core count.]\n");
DISPLAYOUT(" --single-thread Share a single thread for I/O and compression (slightly different than `-T1`).\n");
@@ -1124,6 +1125,7 @@ int main(int argCount, const char* argv[])
if (longCommandWArg(&argument, "--trace")) { char const* traceFile; NEXT_FIELD(traceFile); TRACE_enable(traceFile); continue; }
#endif
if (longCommandWArg(&argument, "--patch-from")) { NEXT_FIELD(patchFromDictFileName); ultra = 1; continue; }
if (longCommandWArg(&argument, "--patch-apply")) { operation=zom_decompress; NEXT_FIELD(patchFromDictFileName); memLimit= 1U << ZSTD_WINDOWLOG_MAX; continue; }
if (longCommandWArg(&argument, "--long")) {
unsigned ldmWindowLog = 0;
ldmFlag = 1;

4
tests/playTests.sh
View File

@@ -1777,11 +1777,15 @@ datagen -g1000 -P10 > tmp_patch
zstd --patch-from=tmp_dict tmp_patch -o tmp_patch_diff
zstd -d --patch-from=tmp_dict tmp_patch_diff -o tmp_patch_recon
$DIFF -s tmp_patch_recon tmp_patch
zstd -f --patch-apply=tmp_dict tmp_patch_diff -o tmp_patch_recon
$DIFF -s tmp_patch_recon tmp_patch
println "\n===> alternate syntax: patch-from origin"
zstd -f --patch-from tmp_dict tmp_patch -o tmp_patch_diff
zstd -df --patch-from tmp_dict tmp_patch_diff -o tmp_patch_recon
$DIFF -s tmp_patch_recon tmp_patch
zstd -f --patch-apply tmp_dict tmp_patch_diff -o tmp_patch_recon
$DIFF -s tmp_patch_recon tmp_patch
rm -rf tmp_*
println "\n===> patch-from recursive tests"