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Merge pull request #510 from x1nixmzeng/xex-header-fix 

Fixed rare crash when accessing library import by name
This commit is contained in:
Ben Vanik 2016-01-10 08:52:17 -08:00
parent 16c97189dd 3eb602c93a
commit 55ae5ba66a
3 changed files with 15 additions and 8 deletions
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15
src/xenia/cpu/xex_module.cc
View File

@ -242,13 +242,15 @@ bool XexModule::Load(const std::string& name, const std::string& path,
// FIXME: Don't know if 32 is the actual limit, but haven't seen more than 2.
const char* string_table[32];
std::memset(string_table, 0, sizeof(string_table));
size_t max_string_table_index = 0;
// Parse the string table
for (size_t i = 0, j = 0; i < opt_import_header->string_table_size; j++) {
assert_true(j < xe::countof(string_table));
for (size_t i = 0; i < opt_import_header->string_table_size;
++max_string_table_index) {
assert_true(max_string_table_index < xe::countof(string_table));
const char* str = opt_import_header->string_table + i;
string_table[j] = str;
string_table[max_string_table_index] = str;
i += std::strlen(str) + 1;
// Padding
@ -260,10 +262,13 @@ bool XexModule::Load(const std::string& name, const std::string& path,
auto libraries_ptr = reinterpret_cast<uint8_t*>(opt_import_header) +
opt_import_header->string_table_size + 12;
uint32_t library_offset = 0;
for (uint32_t i = 0; i < opt_import_header->library_count; i++) {
uint32_t library_count = opt_import_header->library_count;
for (uint32_t i = 0; i < library_count; i++) {
auto library =
reinterpret_cast<xex2_import_library*>(libraries_ptr + library_offset);
SetupLibraryImports(string_table[library->name_index], library);
size_t library_name_index = library->name_index & 0xFF;
assert_true(library_name_index < max_string_table_index);
SetupLibraryImports(string_table[library_name_index], library);
library_offset += library->size;
}

5
src/xenia/kernel/user_module.cc
View File

@ -475,10 +475,11 @@ void UserModule::Dump() {
reinterpret_cast<const uint8_t*>(opt_import_libraries) +
opt_import_libraries->string_table_size + 12;
uint32_t library_offset = 0;
for (uint32_t l = 0; l < opt_import_libraries->library_count; l++) {
uint32_t library_count = opt_import_libraries->library_count;
for (uint32_t l = 0; l < library_count; l++) {
auto library = reinterpret_cast<const xex2_import_library*>(
libraries + library_offset);
auto name = string_table[library->name_index];
auto name = string_table[library->name_index & 0xFF];
sb.AppendFormat(" %s - %d imports\n", name,
(uint16_t)library->count);

3
src/xenia/kernel/util/xex2.cc
View File

@ -285,7 +285,8 @@ int xe_xex2_read_header(const uint8_t* addr, const size_t length,
library->version.value = src_library->version.value;
library->min_version.value = src_library->version_min.value;
std::strncpy(library->name, string_table[src_library->name_index],
std::strncpy(library->name,
string_table[src_library->name_index & 0xFF],
xe::countof(library->name));
library->record_count = src_library->count;