LibCoreDump: CoreDumpReader => CoreDump::Reader

As mentioned in 2d39da5 the usual pattern is that LibFoo provides a Foo
namespace - LibCoreDump doesn't, so this renames CoreDumpReader to
Reader and puts it in the CoreDump namespace. :^)

Libraries/LibCoreDump/Reader.cpp

@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "Reader.h"
+#include <string.h>
+
+namespace CoreDump {
+
+OwnPtr<Reader> Reader::create(const String& path)
+{
+    auto mapped_file = make<MappedFile>(path);
+    if (!mapped_file->is_valid())
+        return nullptr;
+    return make<Reader>(move(mapped_file));
+}
+
+Reader::Reader(OwnPtr<MappedFile>&& coredump_file)
+    : m_coredump_file(move(coredump_file))
+    , m_coredump_image((u8*)m_coredump_file->data(), m_coredump_file->size())
+{
+    size_t index = 0;
+    m_coredump_image.for_each_program_header([this, &index](auto pheader) {
+        if (pheader.type() == PT_NOTE) {
+            m_notes_segment_index = index;
+            return IterationDecision::Break;
+        }
+        ++index;
+        return IterationDecision::Continue;
+    });
+    ASSERT(m_notes_segment_index != -1);
+}
+
+Reader::~Reader()
+{
+}
+
+Reader::NotesEntryIterator::NotesEntryIterator(const u8* notes_data)
+    : m_current((const ELF::Core::NotesEntry*)notes_data)
+    , start(notes_data)
+{
+}
+
+ELF::Core::NotesEntryHeader::Type Reader::NotesEntryIterator::type() const
+{
+    ASSERT(m_current->header.type == ELF::Core::NotesEntryHeader::Type::MemoryRegionInfo
+        || m_current->header.type == ELF::Core::NotesEntryHeader::Type::ThreadInfo
+        || m_current->header.type == ELF::Core::NotesEntryHeader::Type::Null);
+    return m_current->header.type;
+}
+
+const ELF::Core::NotesEntry* Reader::NotesEntryIterator::current() const
+{
+    return m_current;
+}
+
+void Reader::NotesEntryIterator::next()
+{
+    ASSERT(!at_end());
+    if (type() == ELF::Core::NotesEntryHeader::Type::ThreadInfo) {
+        const ELF::Core::ThreadInfo* current = (const ELF::Core::ThreadInfo*)m_current;
+        m_current = (const ELF::Core::NotesEntry*)(current + 1);
+        return;
+    }
+    if (type() == ELF::Core::NotesEntryHeader::Type::MemoryRegionInfo) {
+        const ELF::Core::MemoryRegionInfo* current = (const ELF::Core::MemoryRegionInfo*)m_current;
+        m_current = (const ELF::Core::NotesEntry*)(current->region_name + strlen(current->region_name) + 1);
+        return;
+    }
+}
+
+bool Reader::NotesEntryIterator::at_end() const
+{
+    return type() == ELF::Core::NotesEntryHeader::Type::Null;
+}
+
+Optional<uint32_t> Reader::peek_memory(FlatPtr address) const
+{
+    const auto* region = region_containing(address);
+    if (!region)
+        return {};
+
+    FlatPtr offset_in_region = address - region->region_start;
+    const char* region_data = image().program_header(region->program_header_index).raw_data();
+    return *(const uint32_t*)(&region_data[offset_in_region]);
+}
+
+const ELF::Core::MemoryRegionInfo* Reader::region_containing(FlatPtr address) const
+{
+    const ELF::Core::MemoryRegionInfo* ret = nullptr;
+    for_each_memory_region_info([&ret, address](const ELF::Core::MemoryRegionInfo* region_info) {
+        if (region_info->region_start <= address && region_info->region_end >= address) {
+            ret = region_info;
+            return IterationDecision::Break;
+        }
+        return IterationDecision::Continue;
+    });
+    return ret;
+}
+
+}