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-rw-r--r--src/libstore/references.cc60
-rw-r--r--src/libstore/references.hh18
-rw-r--r--src/libstore/tests/local.mk15
-rw-r--r--src/libstore/tests/references.cc45
4 files changed, 106 insertions, 32 deletions
diff --git a/src/libstore/references.cc b/src/libstore/references.cc
index eb70844a2..c369b14ac 100644
--- a/src/libstore/references.cc
+++ b/src/libstore/references.cc
@@ -11,11 +11,13 @@
namespace nix {
-static unsigned int refLength = 32; /* characters */
+static size_t refLength = 32; /* characters */
-static void search(const unsigned char * s, size_t len,
- StringSet & hashes, StringSet & seen)
+static void search(
+ std::string_view s,
+ StringSet & hashes,
+ StringSet & seen)
{
static std::once_flag initialised;
static bool isBase32[256];
@@ -25,7 +27,7 @@ static void search(const unsigned char * s, size_t len,
isBase32[(unsigned char) base32Chars[i]] = true;
});
- for (size_t i = 0; i + refLength <= len; ) {
+ for (size_t i = 0; i + refLength <= s.size(); ) {
int j;
bool match = true;
for (j = refLength - 1; j >= 0; --j)
@@ -35,7 +37,7 @@ static void search(const unsigned char * s, size_t len,
break;
}
if (!match) continue;
- string ref((const char *) s + i, refLength);
+ std::string ref(s.substr(i, refLength));
if (hashes.erase(ref)) {
debug(format("found reference to '%1%' at offset '%2%'")
% ref % i);
@@ -46,30 +48,23 @@ static void search(const unsigned char * s, size_t len,
}
-struct RefScanSink : Sink
+void RefScanSink::operator () (std::string_view data)
{
- StringSet hashes;
- StringSet seen;
-
- string tail;
-
- RefScanSink() { }
-
- void operator () (std::string_view data) override
- {
- /* It's possible that a reference spans the previous and current
- fragment, so search in the concatenation of the tail of the
- previous fragment and the start of the current fragment. */
- string s = tail + std::string(data, 0, refLength);
- search((const unsigned char *) s.data(), s.size(), hashes, seen);
-
- search((const unsigned char *) data.data(), data.size(), hashes, seen);
-
- size_t tailLen = data.size() <= refLength ? data.size() : refLength;
- tail = std::string(tail, tail.size() < refLength - tailLen ? 0 : tail.size() - (refLength - tailLen));
- tail.append({data.data() + data.size() - tailLen, tailLen});
- }
-};
+ /* It's possible that a reference spans the previous and current
+ fragment, so search in the concatenation of the tail of the
+ previous fragment and the start of the current fragment. */
+ auto s = tail;
+ s.append(data.data(), refLength);
+ search(s, hashes, seen);
+
+ search(data, hashes, seen);
+
+ auto tailLen = std::min(data.size(), refLength);
+ auto rest = refLength - tailLen;
+ if (rest < tail.size())
+ tail = tail.substr(tail.size() - rest);
+ tail.append(data.data() + data.size() - tailLen, tailLen);
+}
std::pair<StorePathSet, HashResult> scanForReferences(
@@ -87,23 +82,24 @@ StorePathSet scanForReferences(
const Path & path,
const StorePathSet & refs)
{
- RefScanSink refsSink;
- TeeSink sink { refsSink, toTee };
+ StringSet hashes;
std::map<std::string, StorePath> backMap;
for (auto & i : refs) {
std::string hashPart(i.hashPart());
auto inserted = backMap.emplace(hashPart, i).second;
assert(inserted);
- refsSink.hashes.insert(hashPart);
+ hashes.insert(hashPart);
}
/* Look for the hashes in the NAR dump of the path. */
+ RefScanSink refsSink(std::move(hashes));
+ TeeSink sink { refsSink, toTee };
dumpPath(path, sink);
/* Map the hashes found back to their store paths. */
StorePathSet found;
- for (auto & i : refsSink.seen) {
+ for (auto & i : refsSink.getResult()) {
auto j = backMap.find(i);
assert(j != backMap.end());
found.insert(j->second);
diff --git a/src/libstore/references.hh b/src/libstore/references.hh
index 73e674109..a6119c861 100644
--- a/src/libstore/references.hh
+++ b/src/libstore/references.hh
@@ -9,6 +9,24 @@ std::pair<StorePathSet, HashResult> scanForReferences(const Path & path, const S
StorePathSet scanForReferences(Sink & toTee, const Path & path, const StorePathSet & refs);
+class RefScanSink : public Sink
+{
+ StringSet hashes;
+ StringSet seen;
+
+ std::string tail;
+
+public:
+
+ RefScanSink(StringSet && hashes) : hashes(hashes)
+ { }
+
+ StringSet & getResult()
+ { return seen; }
+
+ void operator () (std::string_view data) override;
+};
+
struct RewritingSink : Sink
{
std::string from, to, prev;
diff --git a/src/libstore/tests/local.mk b/src/libstore/tests/local.mk
new file mode 100644
index 000000000..6ae9a0285
--- /dev/null
+++ b/src/libstore/tests/local.mk
@@ -0,0 +1,15 @@
+check: libstore-tests_RUN
+
+programs += libstore-tests
+
+libstore-tests_DIR := $(d)
+
+libstore-tests_INSTALL_DIR :=
+
+libstore-tests_SOURCES := $(wildcard $(d)/*.cc)
+
+libstore-tests_CXXFLAGS += -I src/libstore -I src/libutil
+
+libstore-tests_LIBS = libstore
+
+libstore-tests_LDFLAGS := $(GTEST_LIBS)
diff --git a/src/libstore/tests/references.cc b/src/libstore/tests/references.cc
new file mode 100644
index 000000000..d91d1cedd
--- /dev/null
+++ b/src/libstore/tests/references.cc
@@ -0,0 +1,45 @@
+#include "references.hh"
+
+#include <gtest/gtest.h>
+
+namespace nix {
+
+TEST(references, scan)
+{
+ std::string hash1 = "dc04vv14dak1c1r48qa0m23vr9jy8sm0";
+ std::string hash2 = "zc842j0rz61mjsp3h3wp5ly71ak6qgdn";
+
+ {
+ RefScanSink scanner(StringSet{hash1});
+ auto s = "foobar";
+ scanner(s);
+ ASSERT_EQ(scanner.getResult(), StringSet{});
+ }
+
+ {
+ RefScanSink scanner(StringSet{hash1});
+ auto s = "foobar" + hash1 + "xyzzy";
+ scanner(s);
+ ASSERT_EQ(scanner.getResult(), StringSet{hash1});
+ }
+
+ {
+ RefScanSink scanner(StringSet{hash1, hash2});
+ auto s = "foobar" + hash1 + "xyzzy" + hash2;
+ scanner(((std::string_view) s).substr(0, 10));
+ scanner(((std::string_view) s).substr(10, 5));
+ scanner(((std::string_view) s).substr(15, 5));
+ scanner(((std::string_view) s).substr(20));
+ ASSERT_EQ(scanner.getResult(), StringSet({hash1, hash2}));
+ }
+
+ {
+ RefScanSink scanner(StringSet{hash1, hash2});
+ auto s = "foobar" + hash1 + "xyzzy" + hash2;
+ for (auto & i : s)
+ scanner(std::string(1, i));
+ ASSERT_EQ(scanner.getResult(), StringSet({hash1, hash2}));
+ }
+}
+
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 17:11:37 +0000