Convert manual memory allocations to std::unique_ptr (#2253)

src/curl.cpp

@@ -803,17 +803,11 @@ bool S3fsCurl::PushbackSseKeys(const std::string& input)
     std::string base64_key;
     std::string raw_key;
     if(onekey.length() > 256 / 8){
-        char* p_key;
         size_t keylength;
 
-        if(nullptr != (p_key = reinterpret_cast<char*>(s3fs_decode64(onekey.c_str(), onekey.size(), &keylength)))) {
-            raw_key = std::string(p_key, keylength);
-            base64_key = onekey;
-            delete[] p_key;
-        } else {
-            S3FS_PRN_ERR("Failed to convert base64 to SSE-C key %s", onekey.c_str());
-            return false;
-        }
+        std::unique_ptr<unsigned char[]> p_key(s3fs_decode64(onekey.c_str(), onekey.size(), &keylength));
+        raw_key = std::string(reinterpret_cast<char *>(p_key.get()), keylength);
+        base64_key = onekey;
     } else {
         base64_key = s3fs_base64(reinterpret_cast<const unsigned char*>(onekey.c_str()), onekey.length());
         raw_key = onekey;

src/s3fs.cpp

@@ -3636,7 +3636,7 @@ static bool get_xattr_posix_key_value(const char* path, std::string& xattrvalue,
     }
 
     // convert value by base64
-    xattrvalue = s3fs_base64(iter->second->pvalue, iter->second->length);
+    xattrvalue = s3fs_base64(iter->second->pvalue.get(), iter->second->length);
     free_xattrs(xattrs);
 
     return true;
@@ -3764,7 +3764,7 @@ static std::string raw_build_xattrs(const xattrs_t& xattrs)
         strxattrs += "\":\"";
 
         if(iter->second){
-            strxattrs += s3fs_base64(iter->second->pvalue, iter->second->length);
+            strxattrs += s3fs_base64(iter->second->pvalue.get(), iter->second->length);
         }
         strxattrs += '\"';
     }
@@ -3821,8 +3821,8 @@ static int set_xattrs_to_header(headers_t& meta, const char* name, const char* v
     PXATTRVAL pval = new XATTRVAL;
     pval->length = size;
     if(0 < size){
-        pval->pvalue = new unsigned char[size];
-        memcpy(pval->pvalue, value, size);
+        pval->pvalue.reset(new unsigned char[size]);
+        memcpy(pval->pvalue.get(), value, size);
     }else{
         pval->pvalue = nullptr;
     }
@@ -4034,7 +4034,7 @@ static int s3fs_getxattr(const char* path, const char* name, char* value, size_t
     unsigned char* pvalue = nullptr;
     if(nullptr != xiter->second){
         length = xiter->second->length;
-        pvalue = xiter->second->pvalue;
+        pvalue = xiter->second->pvalue.get();
     }
 
     if(0 < size){

src/string_util.cpp

@@ -418,14 +418,9 @@ inline unsigned char char_decode64(const char ch)
     return by;
 }
 
-unsigned char* s3fs_decode64(const char* input, size_t input_len, size_t* plength)
+std::unique_ptr<unsigned char[]> s3fs_decode64(const char* input, size_t input_len, size_t* plength)
 {
-    unsigned char* result;
-    if(!input || 0 == input_len || !plength){
-        return nullptr;
-    }
-    result = new unsigned char[input_len / 4 * 3];
-
+    std::unique_ptr<unsigned char[]> result(new unsigned char[input_len / 4 * 3]);
     unsigned char parts[4];
     size_t rpos;
     size_t wpos;

src/string_util.h

@@ -22,6 +22,7 @@
 #define S3FS_STRING_UTIL_H_
 
 #include <cstring>
+#include <memory>
 
 //
 // A collection of string utilities for manipulating URLs and HTTP responses.
@@ -106,8 +107,7 @@ bool get_keyword_value(const std::string& target, const char* keyword, std::stri
 std::string s3fs_hex_lower(const unsigned char* input, size_t length);
 std::string s3fs_hex_upper(const unsigned char* input, size_t length);
 std::string s3fs_base64(const unsigned char* input, size_t length);
-// TODO: return std::unique_ptr
-unsigned char* s3fs_decode64(const char* input, size_t input_len, size_t* plength);
+std::unique_ptr<unsigned char[]> s3fs_decode64(const char* input, size_t input_len, size_t* plength);
 
 //
 // WTF8

src/test_string_util.cpp

@@ -20,6 +20,7 @@
 
 #include <cstdlib>
 #include <limits>
+#include <memory>
 #include <stdint.h>
 #include <string>
 
@@ -53,35 +54,35 @@ void test_trim()
 
 void test_base64()
 {
-    unsigned char *buf;
+    std::unique_ptr<unsigned char[]> buf;
     size_t len;
 
     ASSERT_STREQUALS(s3fs_base64(nullptr, 0).c_str(), nullptr);
     buf = s3fs_decode64(nullptr, 0, &len);
-    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf), len, nullptr, 0);
+    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf.get()), len, nullptr, 0);
 
     ASSERT_STREQUALS(s3fs_base64(reinterpret_cast<const unsigned char *>(""), 0).c_str(), nullptr);
     buf = s3fs_decode64("", 0, &len);
-    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf), len, nullptr, 0);
+    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf.get()), len, nullptr, 0);
 
     ASSERT_EQUALS(s3fs_base64(reinterpret_cast<const unsigned char *>("1"), 1), std::string("MQ=="));
     buf = s3fs_decode64("MQ==", 4, &len);
-    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf), len, "1", 1);
+    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf.get()), len, "1", 1);
     ASSERT_EQUALS(len, static_cast<size_t>(1));
 
     ASSERT_EQUALS(s3fs_base64(reinterpret_cast<const unsigned char *>("12"), 2), std::string("MTI="));
     buf = s3fs_decode64("MTI=", 4, &len);
-    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf), len, "12", 2);
+    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf.get()), len, "12", 2);
     ASSERT_EQUALS(len, static_cast<size_t>(2));
 
     ASSERT_EQUALS(s3fs_base64(reinterpret_cast<const unsigned char *>("123"), 3), std::string("MTIz"));
     buf = s3fs_decode64("MTIz", 4, &len);
-    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf), len, "123", 3);
+    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf.get()), len, "123", 3);
     ASSERT_EQUALS(len, static_cast<size_t>(3));
 
     ASSERT_EQUALS(s3fs_base64(reinterpret_cast<const unsigned char *>("1234"), 4), std::string("MTIzNA=="));
     buf = s3fs_decode64("MTIzNA==", 8, &len);
-    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf), len, "1234", 4);
+    ASSERT_BUFEQUALS(reinterpret_cast<const char *>(buf.get()), len, "1234", 4);
     ASSERT_EQUALS(len, static_cast<size_t>(4));
 
     // TODO: invalid input

src/types.h

@@ -25,6 +25,7 @@
 #include <cstring>
 #include <string>
 #include <map>
+#include <memory>
 #include <list>
 #include <vector>
 
@@ -56,14 +57,11 @@
 //
 typedef struct xattr_value
 {
-    unsigned char* pvalue;
+    std::unique_ptr<unsigned char[]> pvalue;
     size_t         length;
 
     explicit xattr_value(unsigned char* pval = nullptr, size_t len = 0) : pvalue(pval), length(len) {}
-    ~xattr_value()
-    {
-        delete[] pvalue;
-    }
+    ~xattr_value() {}
 }XATTRVAL, *PXATTRVAL;
 
 typedef std::map<std::string, PXATTRVAL> xattrs_t;