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harddriv: check for CHD by header string, allows files not named .chd that are CHDs to be recognized (nw)

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This commit is contained in:
arbee 2019-08-13 20:34:26 -04:00
parent a5d3c4cca0
commit 882b567585
1 changed files with 7 additions and 6 deletions
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13
src/devices/imagedev/harddriv.cpp
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@ -231,6 +231,7 @@ image_init_result harddisk_image_device::internal_load_hd()
{ {
chd_error err = CHDERR_NONE; chd_error err = CHDERR_NONE;
m_chd = nullptr; m_chd = nullptr;
uint8_t header[64];
if (m_hard_disk_handle != nullptr) if (m_hard_disk_handle != nullptr)
{ {
@ -245,7 +246,11 @@ image_init_result harddisk_image_device::internal_load_hd()
} }
else else
{ {
if (is_filetype("chd")) fseek(0, SEEK_SET);
fread(header, 64);
fseek(0, SEEK_SET);
if (!memcmp("MComprHD", header, 8))
{ {
err = m_origchd.open(image_core_file(), true); err = m_origchd.open(image_core_file(), true);
@ -280,16 +285,12 @@ image_init_result harddisk_image_device::internal_load_hd()
if (is_open()) if (is_open())
{ {
uint32_t skip = 0; uint32_t skip = 0;
uint8_t header[64];
fseek(0, SEEK_SET);
fread(header, 64);
// check for 2MG format // check for 2MG format
if (!memcmp(header, "2IMG", 4)) if (!memcmp(header, "2IMG", 4))
{ {
skip = header[0x18] | (header[0x19] << 8) | (header[0x1a] << 16) | (header[0x1b] << 24); skip = header[0x18] | (header[0x19] << 8) | (header[0x1a] << 16) | (header[0x1b] << 24);
osd_printf_verbose("harddriv: found 2MG, creator is %c%c%c%c, data at %08x\n", header[4], header[5], header[6], header[7], skip); osd_printf_verbose("harddriv: detected 2MG, creator is %c%c%c%c, data at %08x\n", header[4], header[5], header[6], header[7], skip);
} }
// check for HDI format // check for HDI format
else if (is_filetype("hdi")) else if (is_filetype("hdi"))