Fix multi-line hex dumping and add unit test.
Change-Id: I7657018fef5d9c17410a9a634db275555f180014
diff --git a/runtime/base/hex_dump.cc b/runtime/base/hex_dump.cc
new file mode 100644
index 0000000..936c52b
--- /dev/null
+++ b/runtime/base/hex_dump.cc
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "hex_dump.h"
+
+#include "globals.h"
+
+#include <string.h>
+
+namespace art {
+
+void HexDump::Dump(std::ostream& os) const {
+ if (byte_count_ == 0) {
+ return;
+ }
+
+ if (address_ == NULL) {
+ os << "00000000:";
+ return;
+ }
+
+ static const char gHexDigit[] = "0123456789abcdef";
+ const unsigned char* addr = reinterpret_cast<const unsigned char*>(address_);
+ // 01234560: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff 0123456789abcdef
+ char out[(kBitsPerWord / 4) + /* offset */
+ 1 + /* colon */
+ (16 * 3) + /* 16 hex digits and space */
+ 2 + /* white space */
+ 16 + /* 16 characters*/
+ 1 /* \0 */ ];
+ size_t offset; /* offset to show while printing */
+
+ if (show_actual_addresses_) {
+ offset = reinterpret_cast<size_t>(addr);
+ } else {
+ offset = 0;
+ }
+ memset(out, ' ', sizeof(out)-1);
+ out[kBitsPerWord / 4] = ':';
+ out[sizeof(out)-1] = '\0';
+
+ size_t byte_count = byte_count_;
+ size_t gap = offset & 0x0f;
+ while (byte_count > 0) {
+ size_t line_offset = offset & ~0x0f;
+
+ char* hex = out;
+ char* asc = out + (kBitsPerWord / 4) + /* offset */ 1 + /* colon */
+ (16 * 3) + /* 16 hex digits and space */ 2 /* white space */;
+
+ for (int i = 0; i < (kBitsPerWord / 4); i++) {
+ *hex++ = gHexDigit[line_offset >> (kBitsPerWord - 4)];
+ line_offset <<= 4;
+ }
+ hex++;
+ hex++;
+
+ size_t count = std::min(byte_count, 16 - gap);
+ // CHECK_NE(count, 0U);
+ // CHECK_LE(count + gap, 16U);
+
+ if (gap) {
+ /* only on first line */
+ hex += gap * 3;
+ asc += gap;
+ }
+
+ size_t i;
+ for (i = gap ; i < count + gap; i++) {
+ *hex++ = gHexDigit[*addr >> 4];
+ *hex++ = gHexDigit[*addr & 0x0f];
+ hex++;
+ if (*addr >= 0x20 && *addr < 0x7f /*isprint(*addr)*/) {
+ *asc++ = *addr;
+ } else {
+ *asc++ = '.';
+ }
+ addr++;
+ }
+ for (; i < 16; i++) {
+ /* erase extra stuff; only happens on last line */
+ *hex++ = ' ';
+ *hex++ = ' ';
+ hex++;
+ *asc++ = ' ';
+ }
+
+ os << prefix_ << out;
+
+ gap = 0;
+ byte_count -= count;
+ offset += count;
+ if (byte_count > 0) {
+ os << "\n";
+ }
+ }
+}
+
+} // namespace art