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Eliminated device_image_interface::make_readonly()

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Take note that I eliminated make_readonly(); here is why I think the calls were unnecessary:
1.  All image loads through softlists are done through common_process_file(), and thus going to be readonly anyways
2.  The cassette.cpp call to make_readonly() seems to be a residual hack, if a failure occurs the image will be unloaded anyways
This commit is contained in:
Nathan Woods 2016-08-09 22:27:24 -04:00
parent 6a3c13eb5b
commit 1cda375d5e
3 changed files with 1 additions and 8 deletions
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4
src/devices/imagedev/cassette.cpp
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@ -285,10 +285,6 @@ image_init_result cassette_image_device::internal_load(bool is_create)
cassette_flags = is_writable ? (CASSETTE_FLAG_READWRITE|CASSETTE_FLAG_SAVEONEXIT) : CASSETTE_FLAG_READONLY;
std::string fname;
err = cassette_open_choices((void *)image, &image_ioprocs, filetype().c_str(), m_formats, cassette_flags, &m_cassette);
/* this is kind of a hack */
if (err && is_writable)
make_readonly();
}
while(err && is_writable);

4
src/emu/diimage.cpp
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@ -510,7 +510,7 @@ void device_image_interface::image_checkhash()
// only calculate CRC if it hasn't been calculated, and the open_mode is read only
UINT32 crcval;
if (!m_hash.crc(crcval) && m_readonly && !m_created)
if (!m_hash.crc(crcval) && is_readonly() && !m_created)
{
// do not cause a linear read of 600 megs please
// TODO: use SHA1 in the CHD header as the hash
@ -1060,8 +1060,6 @@ image_init_result device_image_interface::load_software(const std::string &softl
const char *read_only = get_feature("read_only");
if (read_only && !strcmp(read_only, "true"))
{
make_readonly();
// Copy some image information when we have been loaded through a software list
if (m_software_info_ptr)
{

1
src/emu/diimage.h
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@ -180,7 +180,6 @@ public:
util::core_file &image_core_file() const { return *m_file; }
UINT64 length() { check_for_file(); return m_file->size(); }
bool is_readonly() const { return m_readonly; }
void make_readonly() { m_readonly = true; }
UINT32 fread(void *buffer, UINT32 length) { check_for_file(); return m_file->read(buffer, length); }
UINT32 fread(optional_shared_ptr<UINT8> &ptr, UINT32 length) { ptr.allocate(length); return fread(ptr.target(), length); }
UINT32 fread(optional_shared_ptr<UINT8> &ptr, UINT32 length, offs_t offset) { ptr.allocate(length); return fread(ptr + offset, length - offset); }