1 files changed, 319 insertions, 0 deletions
diff --git a/lib/avb/libavb/avb_util.c b/lib/avb/libavb/avb_util.c
new file mode 100644
index 0000000..435e556
--- /dev/null
+++ b/lib/avb/libavb/avb_util.c
@@ -0,0 +1,319 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "avb_util.h"
+
+uint32_t avb_be32toh(uint32_t in) {
+  uint8_t* d = (uint8_t*)&in;
+  uint32_t ret;
+  ret = ((uint32_t)d[0]) << 24;
+  ret |= ((uint32_t)d[1]) << 16;
+  ret |= ((uint32_t)d[2]) << 8;
+  ret |= ((uint32_t)d[3]);
+  return ret;
+}
+
+uint64_t avb_be64toh(uint64_t in) {
+  uint8_t* d = (uint8_t*)&in;
+  uint64_t ret;
+  ret = ((uint64_t)d[0]) << 56;
+  ret |= ((uint64_t)d[1]) << 48;
+  ret |= ((uint64_t)d[2]) << 40;
+  ret |= ((uint64_t)d[3]) << 32;
+  ret |= ((uint64_t)d[4]) << 24;
+  ret |= ((uint64_t)d[5]) << 16;
+  ret |= ((uint64_t)d[6]) << 8;
+  ret |= ((uint64_t)d[7]);
+  return ret;
+}
+
+/* Converts a 32-bit unsigned integer from host to big-endian byte order. */
+uint32_t avb_htobe32(uint32_t in) {
+  union {
+    uint32_t word;
+    uint8_t bytes[4];
+  } ret;
+  ret.bytes[0] = (in >> 24) & 0xff;
+  ret.bytes[1] = (in >> 16) & 0xff;
+  ret.bytes[2] = (in >> 8) & 0xff;
+  ret.bytes[3] = in & 0xff;
+  return ret.word;
+}
+
+/* Converts a 64-bit unsigned integer from host to big-endian byte order. */
+uint64_t avb_htobe64(uint64_t in) {
+  union {
+    uint64_t word;
+    uint8_t bytes[8];
+  } ret;
+  ret.bytes[0] = (in >> 56) & 0xff;
+  ret.bytes[1] = (in >> 48) & 0xff;
+  ret.bytes[2] = (in >> 40) & 0xff;
+  ret.bytes[3] = (in >> 32) & 0xff;
+  ret.bytes[4] = (in >> 24) & 0xff;
+  ret.bytes[5] = (in >> 16) & 0xff;
+  ret.bytes[6] = (in >> 8) & 0xff;
+  ret.bytes[7] = in & 0xff;
+  return ret.word;
+}
+
+int avb_safe_memcmp(const void* s1, const void* s2, size_t n) {
+  const unsigned char* us1 = s1;
+  const unsigned char* us2 = s2;
+  int result = 0;
+
+  if (0 == n) return 0;
+
+  /*
+   * Code snippet without data-dependent branch due to Nate Lawson
+   * (nate@root.org) of Root Labs.
+   */
+  while (n--) result |= *us1++ ^ *us2++;
+
+  return result != 0;
+}
+
+bool avb_safe_add_to(uint64_t* value, uint64_t value_to_add) {
+  uint64_t original_value;
+
+  avb_assert(value != NULL);
+
+  original_value = *value;
+
+  *value += value_to_add;
+  if (*value < original_value) {
+    avb_error("Overflow when adding values.\n");
+    return false;
+  }
+
+  return true;
+}
+
+bool avb_safe_add(uint64_t* out_result, uint64_t a, uint64_t b) {
+  uint64_t dummy;
+  if (out_result == NULL) out_result = &dummy;
+  *out_result = a;
+  return avb_safe_add_to(out_result, b);
+}
+
+bool avb_validate_utf8(const uint8_t* data, size_t num_bytes) {
+  size_t n;
+  unsigned int num_cc;
+
+  for (n = 0, num_cc = 0; n < num_bytes; n++) {
+    uint8_t c = data[n];
+
+    if (num_cc > 0) {
+      if ((c & (0x80 | 0x40)) == 0x80) {
+        /* 10xx xxxx */
+      } else {
+        goto fail;
+      }
+      num_cc--;
+    } else {
+      if (c < 0x80) {
+        num_cc = 0;
+      } else if ((c & (0x80 | 0x40 | 0x20)) == (0x80 | 0x40)) {
+        /* 110x xxxx */
+        num_cc = 1;
+      } else if ((c & (0x80 | 0x40 | 0x20 | 0x10)) == (0x80 | 0x40 | 0x20)) {
+        /* 1110 xxxx */
+        num_cc = 2;
+      } else if ((c & (0x80 | 0x40 | 0x20 | 0x10 | 0x08)) ==
+                 (0x80 | 0x40 | 0x20 | 0x10)) {
+        /* 1111 0xxx */
+        num_cc = 3;
+      } else {
+        goto fail;
+      }
+    }
+  }
+
+  if (num_cc != 0) {
+    goto fail;
+  }
+
+  return true;
+
+fail:
+  return false;
+}
+
+bool avb_str_concat(char* buf, size_t buf_size, const char* str1,
+                    size_t str1_len, const char* str2, size_t str2_len) {
+  uint64_t combined_len;
+
+  if (!avb_safe_add(&combined_len, str1_len, str2_len)) {
+    avb_error("Overflow when adding string sizes.\n");
+    return false;
+  }
+
+  if (combined_len > buf_size - 1) {
+    avb_error("Insufficient buffer space.\n");
+    return false;
+  }
+
+  avb_memcpy(buf, str1, str1_len);
+  avb_memcpy(buf + str1_len, str2, str2_len);
+  buf[combined_len] = '\0';
+
+  return true;
+}
+
+void* avb_malloc(size_t size) {
+  void* ret = avb_malloc_(size);
+  if (ret == NULL) {
+    avb_error("Failed to allocate memory.\n");
+    return NULL;
+  }
+  return ret;
+}
+
+void* avb_calloc(size_t size) {
+  void* ret = avb_malloc(size);
+  if (ret == NULL) {
+    return NULL;
+  }
+
+  avb_memset(ret, '\0', size);
+  return ret;
+}
+
+char* avb_strdup(const char* str) {
+  size_t len = avb_strlen(str);
+  char* ret = avb_malloc(len + 1);
+  if (ret == NULL) {
+    return NULL;
+  }
+
+  avb_memcpy(ret, str, len);
+  ret[len] = '\0';
+
+  return ret;
+}
+
+const char* avb_strstr(const char* haystack, const char* needle) {
+  size_t n, m;
+
+  /* Look through |haystack| and check if the first character of
+   * |needle| matches. If so, check the rest of |needle|.
+   */
+  for (n = 0; haystack[n] != '\0'; n++) {
+    if (haystack[n] != needle[0]) continue;
+
+    for (m = 1;; m++) {
+      if (needle[m] == '\0') {
+        return haystack + n;
+      }
+
+      if (haystack[n + m] != needle[m]) break;
+    }
+  }
+
+  return NULL;
+}
+
+const char* avb_strv_find_str(const char* const* strings, const char* str,
+                              size_t str_size) {
+  size_t n;
+  for (n = 0; strings[n] != NULL; n++) {
+    if (avb_strlen(strings[n]) == str_size &&
+        avb_memcmp(strings[n], str, str_size) == 0) {
+      return strings[n];
+    }
+  }
+  return NULL;
+}
+
+char* avb_replace(const char* str, const char* search, const char* replace) {
+  char* ret = NULL;
+  size_t ret_len = 0;
+  size_t search_len, replace_len;
+  const char* str_after_last_replace;
+
+  search_len = avb_strlen(search);
+  replace_len = avb_strlen(replace);
+
+  str_after_last_replace = str;
+  while (*str != '\0') {
+    const char* s;
+    size_t num_before;
+    size_t num_new;
+
+    s = avb_strstr(str, search);
+    if (s == NULL) break;
+
+    num_before = s - str;
+
+    if (ret == NULL) {
+      num_new = num_before + replace_len + 1;
+      ret = avb_malloc(num_new);
+      if (ret == NULL) {
+        goto out;
+      }
+      avb_memcpy(ret, str, num_before);
+      avb_memcpy(ret + num_before, replace, replace_len);
+      ret[num_new - 1] = '\0';
+      ret_len = num_new - 1;
+    } else {
+      char* new_str;
+      num_new = ret_len + num_before + replace_len + 1;
+      new_str = avb_malloc(num_new);
+      if (ret == NULL) {
+        goto out;
+      }
+      avb_memcpy(new_str, ret, ret_len);
+      avb_memcpy(new_str + ret_len, str, num_before);
+      avb_memcpy(new_str + ret_len + num_before, replace, replace_len);
+      new_str[num_new - 1] = '\0';
+      avb_free(ret);
+      ret = new_str;
+      ret_len = num_new - 1;
+    }
+
+    str = s + search_len;
+    str_after_last_replace = str;
+  }
+
+  if (ret == NULL) {
+    ret = avb_strdup(str_after_last_replace);
+    if (ret == NULL) {
+      goto out;
+    }
+  } else {
+    size_t num_remaining = avb_strlen(str_after_last_replace);
+    size_t num_new = ret_len + num_remaining + 1;
+    char* new_str = avb_malloc(num_new);
+    if (ret == NULL) goto out;
+    avb_memcpy(new_str, ret, ret_len);
+    avb_memcpy(new_str + ret_len, str_after_last_replace, num_remaining);
+    new_str[num_new - 1] = '\0';
+    avb_free(ret);
+    ret = new_str;
+    ret_len = num_new - 1;
+  }
+
+out:
+  return ret;
+}