chore: checkpoint before Python removal

vendor/aws-lc-sys/aws-lc/crypto/buf/buf.c

@@ -0,0 +1,105 @@
+// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+#include <openssl/buf.h>
+
+#include <string.h>
+
+#include <openssl/mem.h>
+#include <openssl/err.h>
+
+#include "../internal.h"
+
+
+BUF_MEM *BUF_MEM_new(void) { return OPENSSL_zalloc(sizeof(BUF_MEM)); }
+
+void BUF_MEM_free(BUF_MEM *buf) {
+  if (buf == NULL) {
+    return;
+  }
+
+  OPENSSL_free(buf->data);
+  OPENSSL_free(buf);
+}
+
+int BUF_MEM_reserve(BUF_MEM *buf, size_t cap) {
+  if (buf->max >= cap) {
+    return 1;
+  }
+
+  size_t n = cap + 3;
+  if (n < cap) {
+    OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);
+    return 0;
+  }
+  n = n / 3;
+  size_t alloc_size = n * 4;
+  if (alloc_size / 4 != n) {
+    OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);
+    return 0;
+  }
+
+  char *new_buf = OPENSSL_realloc(buf->data, alloc_size);
+  if (new_buf == NULL) {
+    return 0;
+  }
+
+  buf->data = new_buf;
+  buf->max = alloc_size;
+  return 1;
+}
+
+size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
+  if (!BUF_MEM_reserve(buf, len)) {
+    return 0;
+  }
+  if (buf->length < len) {
+    OPENSSL_memset(&buf->data[buf->length], 0, len - buf->length);
+  }
+  buf->length = len;
+  return len;
+}
+
+size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
+  return BUF_MEM_grow(buf, len);
+}
+
+int BUF_MEM_append(BUF_MEM *buf, const void *in, size_t len) {
+  // Work around a C language bug. See https://crbug.com/1019588.
+  if (len == 0) {
+    return 1;
+  }
+  size_t new_len = buf->length + len;
+  if (new_len < len) {
+    OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);
+    return 0;
+  }
+  if (!BUF_MEM_reserve(buf, new_len)) {
+    return 0;
+  }
+  OPENSSL_memcpy(buf->data + buf->length, in, len);
+  buf->length = new_len;
+  return 1;
+}
+
+char *BUF_strdup(const char *str) { return OPENSSL_strdup(str); }
+
+size_t BUF_strnlen(const char *str, size_t max_len) {
+  return OPENSSL_strnlen(str, max_len);
+}
+
+char *BUF_strndup(const char *str, size_t size) {
+  return OPENSSL_strndup(str, size);
+}
+
+size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
+  return OPENSSL_strlcpy(dst, src, dst_size);
+}
+
+size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
+  return OPENSSL_strlcat(dst, src, dst_size);
+}
+
+void *BUF_memdup(const void *data, size_t size) {
+  return OPENSSL_memdup(data, size);
+}

vendor/aws-lc-sys/aws-lc/crypto/buf/buf_test.cc

@@ -0,0 +1,86 @@
+// Copyright (c) 2017, Google Inc.
+// SPDX-License-Identifier: ISC
+
+#include <openssl/buf.h>
+
+#include <string.h>
+
+#include <string>
+
+#include <gtest/gtest.h>
+
+
+TEST(BufTest, Basic) {
+  bssl::UniquePtr<BUF_MEM> buf(BUF_MEM_new());
+  ASSERT_TRUE(buf);
+  EXPECT_EQ(0u, buf->length);
+
+  // Use BUF_MEM_reserve to increase buf->max.
+  ASSERT_TRUE(BUF_MEM_reserve(buf.get(), 200));
+  EXPECT_GE(buf->max, 200u);
+  EXPECT_EQ(0u, buf->length);
+
+  // BUF_MEM_reserve with a smaller cap is a no-op.
+  size_t old_max = buf->max;
+  ASSERT_TRUE(BUF_MEM_reserve(buf.get(), 100));
+  EXPECT_EQ(old_max, buf->max);
+  EXPECT_EQ(0u, buf->length);
+
+  // BUF_MEM_grow can increase the length without reallocating.
+  ASSERT_EQ(100u, BUF_MEM_grow(buf.get(), 100));
+  EXPECT_EQ(100u, buf->length);
+  EXPECT_EQ(old_max, buf->max);
+  memset(buf->data, 'A', buf->length);
+
+  // If BUF_MEM_reserve reallocates, it preserves the contents.
+  ASSERT_TRUE(BUF_MEM_reserve(buf.get(), old_max + 1));
+  ASSERT_GE(buf->max, old_max + 1);
+  EXPECT_EQ(100u, buf->length);
+  for (size_t i = 0; i < 100; i++) {
+    EXPECT_EQ('A', buf->data[i]);
+  }
+
+  // BUF_MEM_grow should zero everything beyond buf->length.
+  memset(buf->data, 'B', buf->max);
+  ASSERT_EQ(150u, BUF_MEM_grow(buf.get(), 150));
+  EXPECT_EQ(150u, buf->length);
+  for (size_t i = 0; i < 100; i++) {
+    EXPECT_EQ('B', buf->data[i]);
+  }
+  for (size_t i = 100; i < 150; i++) {
+    EXPECT_EQ(0, buf->data[i]);
+  }
+
+  // BUF_MEM_grow can rellocate if necessary.
+  size_t new_len = buf->max + 1;
+  ASSERT_EQ(new_len, BUF_MEM_grow(buf.get(), new_len));
+  EXPECT_GE(buf->max, new_len);
+  EXPECT_EQ(new_len, buf->length);
+  for (size_t i = 0; i < 100; i++) {
+    EXPECT_EQ('B', buf->data[i]);
+  }
+  for (size_t i = 100; i < new_len; i++) {
+    EXPECT_EQ(0, buf->data[i]);
+  }
+
+  // BUF_MEM_grow can shink.
+  ASSERT_EQ(50u, BUF_MEM_grow(buf.get(), 50));
+  EXPECT_EQ(50u, buf->length);
+  for (size_t i = 0; i < 50; i++) {
+    EXPECT_EQ('B', buf->data[i]);
+  }
+}
+
+TEST(BufTest, Append) {
+  bssl::UniquePtr<BUF_MEM> buf(BUF_MEM_new());
+  ASSERT_TRUE(buf);
+
+  ASSERT_TRUE(BUF_MEM_append(buf.get(), nullptr, 0));
+  ASSERT_TRUE(BUF_MEM_append(buf.get(), "hello ", 6));
+  ASSERT_TRUE(BUF_MEM_append(buf.get(), nullptr, 0));
+  ASSERT_TRUE(BUF_MEM_append(buf.get(), "world", 5));
+  std::string str(128, 'A');
+  ASSERT_TRUE(BUF_MEM_append(buf.get(), str.data(), str.size()));
+
+  EXPECT_EQ("hello world" + str, std::string(buf->data, buf->length));
+}