Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 192 insertions, 0 deletions

diff --git a/dom/canvas/WebGLValidateStrings.cpp b/dom/canvas/WebGLValidateStrings.cpp
new file mode 100644
index 0000000000..43b814e835
--- /dev/null
+++ b/dom/canvas/WebGLValidateStrings.cpp
@@ -0,0 +1,192 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WebGLValidateStrings.h"
+
+#include <regex>
+
+#include "WebGLTypes.h"
+#include "nsPrintfCString.h"
+
+namespace mozilla {
+
+/* GLSL ES 3.00 p17:
+  - Comments are delimited by / * and * /, or by // and a newline.
+
+  - '//' style comments include the initial '//' marker and continue up to, but
+not including, the terminating newline.
+
+  - '/ * ... * /' comments include both the start and end marker.
+
+  - The begin comment delimiters (/ * or //) are not recognized as comment
+delimiters inside of a comment, hence comments cannot be nested.
+
+  - Comments are treated syntactically as a single space.
+*/
+
+std::string CommentsToSpaces(const std::string& src) {
+  constexpr auto flags =
+      std::regex::ECMAScript | std::regex::nosubs | std::regex::optimize;
+
+  static const auto RE_COMMENT_BEGIN = std::regex("/[*/]", flags);
+  static const auto RE_LINE_COMMENT_END = std::regex(R"([^\\]\n)", flags);
+  static const auto RE_BLOCK_COMMENT_END = std::regex(R"(\*/)", flags);
+
+  std::string ret;
+  ret.reserve(src.size());
+
+  // Replace all comments with block comments with the right number of newlines.
+  // Line positions may be off, but line numbers will be accurate, which is more
+  // important.
+
+  auto itr = src.begin();
+  const auto end = src.end();
+  std::smatch match;
+  while (std::regex_search(itr, end, match, RE_COMMENT_BEGIN)) {
+    MOZ_ASSERT(match.length() == 2);
+    const auto commentBegin = itr + match.position();
+    ret.append(itr, commentBegin);
+
+    itr = commentBegin + match.length();
+
+    const bool isBlockComment = (*(commentBegin + 1) == '*');
+    const auto* endRegex = &RE_LINE_COMMENT_END;
+    if (isBlockComment) {
+      endRegex = &RE_BLOCK_COMMENT_END;
+    }
+
+    if (isBlockComment) {
+      ret += "/*";
+    }
+
+    auto commentEnd = end;
+    if (!isBlockComment && itr != end && *itr == '\n') {
+      commentEnd = itr + 1;  // '//\n'
+    } else if (std::regex_search(itr, end, match, *endRegex)) {
+      commentEnd = itr + match.position() + match.length();
+    } else {
+      return ret;
+    }
+
+    for (; itr != commentEnd; ++itr) {
+      const auto cur = *itr;
+      if (cur == '\n') {
+        ret += cur;
+      }
+    }
+    if (isBlockComment) {
+      ret += "*/";
+    }
+  }
+
+  ret.append(itr, end);
+  return ret;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+static constexpr bool IsValidGLSLChar(const char c) {
+  if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') ||
+      ('0' <= c && c <= '9')) {
+    return true;
+  }
+
+  switch (c) {
+    case ' ':
+    case '\t':
+    case '\v':
+    case '\f':
+    case '\r':
+    case '\n':
+    case '_':
+    case '.':
+    case '+':
+    case '-':
+    case '/':
+    case '*':
+    case '%':
+    case '<':
+    case '>':
+    case '[':
+    case ']':
+    case '(':
+    case ')':
+    case '{':
+    case '}':
+    case '^':
+    case '|':
+    case '&':
+    case '~':
+    case '=':
+    case '!':
+    case ':':
+    case ';':
+    case ',':
+    case '?':
+      return true;
+
+    default:
+      return false;
+  }
+}
+
+static constexpr bool IsValidForPreprocOrGlsl(const char c) {
+  switch (c) {
+    case '#':
+    case '\\':
+      return true;
+
+    default:
+      return IsValidGLSLChar(c);
+  }
+}
+
+////
+
+static constexpr char INVALID_GLSL_CHAR = '$';
+
+std::string CrushGlslToAscii(const std::string& u8) {
+  static_assert(!IsValidForPreprocOrGlsl(INVALID_GLSL_CHAR));
+  auto ascii = u8;
+  for (auto& c : ascii) {
+    if (MOZ_UNLIKELY(!IsValidForPreprocOrGlsl(c))) {
+      c = INVALID_GLSL_CHAR;
+    }
+  }
+  return ascii;
+}
+
+Maybe<webgl::ErrorInfo> CheckGLSLVariableName(const bool webgl2,
+                                              const std::string& name) {
+  if (name.empty()) return {};
+
+  const uint32_t maxSize = webgl2 ? 1024 : 256;
+  if (name.size() > maxSize) {
+    const auto info = nsPrintfCString(
+        "Identifier is %zu characters long, exceeds the"
+        " maximum allowed length of %u characters.",
+        name.size(), maxSize);
+    return Some(webgl::ErrorInfo{LOCAL_GL_INVALID_VALUE, info.BeginReading()});
+  }
+
+  for (const auto cur : name) {
+    if (!IsValidGLSLChar(cur)) {
+      const auto info =
+          nsPrintfCString("String contains the illegal character 0x%x'.", cur);
+      return Some(
+          webgl::ErrorInfo{LOCAL_GL_INVALID_VALUE, info.BeginReading()});
+    }
+  }
+
+  if (name.find("webgl_") == 0 || name.find("_webgl_") == 0) {
+    return Some(webgl::ErrorInfo{
+        LOCAL_GL_INVALID_OPERATION,
+        "String matches reserved GLSL prefix pattern /_?webgl_/."});
+  }
+
+  return {};
+}
+
+}  // namespace mozilla