mirror of
https://github.com/holub/mame
synced 2025-05-20 12:48:53 +03:00
84618c3f7a
- added running_machine to internal structure, removed as explicit parameter - added new function rom_file_size() to compute the size of a ROM - removed rom_first_chunk() and rom_next_chunk() which are no longer needed - changed progress display to be based on size of ROMs loaded, not number - changed temporary load buffer to be dynamically allocated - fixed reload logic to handle skipped BIOSes Also changed rand_memory() to use a fixed seed for consistent behavior.
98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
/***************************************************************************
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coreutil.c
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Miscellaneous utility code
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Copyright Nicola Salmoria and the MAME Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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****************************************************************************/
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#include "coreutil.h"
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/***************************************************************************
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BINARY CODED DECIMAL HELPERS
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***************************************************************************/
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int bcd_adjust(int value)
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{
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if ((value & 0xf) >= 0xa)
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value = value + 0x10 - 0xa;
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if ((value & 0xf0) >= 0xa0)
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value = value - 0xa0 + 0x100;
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return value;
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}
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UINT32 dec_2_bcd(UINT32 a)
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{
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UINT32 result = 0;
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int shift = 0;
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while (a != 0)
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{
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result |= (a % 10) << shift;
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a /= 10;
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shift += 4;
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}
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return result;
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}
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UINT32 bcd_2_dec(UINT32 a)
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{
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UINT32 result = 0;
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UINT32 scale = 1;
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while (a != 0)
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{
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result += (a & 0x0f) * scale;
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a >>= 4;
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scale *= 10;
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}
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return result;
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}
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/***************************************************************************
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GREGORIAN CALENDAR HELPERS
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***************************************************************************/
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int gregorian_is_leap_year(int year)
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{
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return !(year % 100 ? year % 4 : year % 400);
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}
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/* months are one counted */
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int gregorian_days_in_month(int month, int year)
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{
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if (month == 2)
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return gregorian_is_leap_year(year) ? 29 : 28;
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else if (month == 4 || month == 6 || month == 9 || month == 11)
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return 30;
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else
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return 31;
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}
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/***************************************************************************
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MISC
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***************************************************************************/
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void rand_memory(void *memory, size_t length)
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{
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static UINT32 seed = 0;
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UINT8 *bytes = (UINT8 *) memory;
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size_t i;
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for (i = 0; i < length; i++)
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{
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seed = seed * 214013 + 2531011;
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bytes[i] = (UINT8) (seed >> 16);
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}
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}
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