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Merge "Use ReadFileToString() in GetHash()"

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Treehugger Robot 2019-10-16 10:45:27 +00:00 committed by Gerrit Code Review
commit 9b9854a80a
1 changed files with 6 additions and 13 deletions
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19
fs_mgr/libsnapshot/test_helpers.cpp
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@ -92,21 +92,14 @@ std::string ToHexString(const uint8_t* buf, size_t len) {
}
std::optional<std::string> GetHash(const std::string& path) {
unique_fd fd(open(path.c_str(), O_RDONLY));
char buf[4096];
std::string content;
if (!android::base::ReadFileToString(path, &content, true)) {
PLOG(ERROR) << "Cannot access " << path;
return std::nullopt;
}
SHA256_CTX ctx;
SHA256_Init(&ctx);
while (true) {
ssize_t n = TEMP_FAILURE_RETRY(read(fd.get(), buf, sizeof(buf)));
if (n < 0) {
PLOG(ERROR) << "Cannot read " << path;
return std::nullopt;
}
if (n == 0) {
break;
}
SHA256_Update(&ctx, buf, n);
}
SHA256_Update(&ctx, content.c_str(), content.size());
uint8_t out[32];
SHA256_Final(out, &ctx);
return ToHexString(out, sizeof(out));