// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** imageutl.h Image related utilities ***************************************************************************/ #pragma once #ifndef __IMAGEUTL_H__ #define __IMAGEUTL_H__ #include "osdcore.h" /* ----------------------------------------------------------------------- * CRC stuff * ----------------------------------------------------------------------- */ unsigned short ccitt_crc16(unsigned short crc, const unsigned char *buffer, size_t buffer_len); unsigned short ccitt_crc16_one( unsigned short crc, const unsigned char data ); /* ----------------------------------------------------------------------- * Alignment-friendly integer placement * ----------------------------------------------------------------------- */ INLINE void place_integer_be(void *ptr, size_t offset, size_t size, UINT64 value) { UINT8 *byte_ptr = ((UINT8 *) ptr) + offset; UINT16 val16; UINT32 val32; switch(size) { case 2: val16 = BIG_ENDIANIZE_INT16((UINT16) value); memcpy(byte_ptr, &val16, sizeof(val16)); break; case 4: val32 = BIG_ENDIANIZE_INT32((UINT32) value); memcpy(byte_ptr, &val32, sizeof(val32)); break; default: if (size >= 1) byte_ptr[0] = (UINT8) (value >> ((size - 1) * 8)); if (size >= 2) byte_ptr[1] = (UINT8) (value >> ((size - 2) * 8)); if (size >= 3) byte_ptr[2] = (UINT8) (value >> ((size - 3) * 8)); if (size >= 4) byte_ptr[3] = (UINT8) (value >> ((size - 4) * 8)); if (size >= 5) byte_ptr[4] = (UINT8) (value >> ((size - 5) * 8)); if (size >= 6) byte_ptr[5] = (UINT8) (value >> ((size - 6) * 8)); if (size >= 7) byte_ptr[6] = (UINT8) (value >> ((size - 7) * 8)); if (size >= 8) byte_ptr[7] = (UINT8) (value >> ((size - 8) * 8)); break; } } INLINE UINT64 pick_integer_be(const void *ptr, size_t offset, size_t size) { UINT64 result = 0; const UINT8 *byte_ptr = ((const UINT8 *) ptr) + offset; UINT16 val16; UINT32 val32; switch(size) { case 1: result = *byte_ptr; break; case 2: memcpy(&val16, byte_ptr, sizeof(val16)); result = BIG_ENDIANIZE_INT16(val16); break; case 4: memcpy(&val32, byte_ptr, sizeof(val32)); result = BIG_ENDIANIZE_INT32(val32); break; default: if (size >= 1) result |= ((UINT64) byte_ptr[0]) << ((size - 1) * 8); if (size >= 2) result |= ((UINT64) byte_ptr[1]) << ((size - 2) * 8); if (size >= 3) result |= ((UINT64) byte_ptr[2]) << ((size - 3) * 8); if (size >= 4) result |= ((UINT64) byte_ptr[3]) << ((size - 4) * 8); if (size >= 5) result |= ((UINT64) byte_ptr[4]) << ((size - 5) * 8); if (size >= 6) result |= ((UINT64) byte_ptr[5]) << ((size - 6) * 8); if (size >= 7) result |= ((UINT64) byte_ptr[6]) << ((size - 7) * 8); if (size >= 8) result |= ((UINT64) byte_ptr[7]) << ((size - 8) * 8); break; } return result; } INLINE void place_integer_le(void *ptr, size_t offset, size_t size, UINT64 value) { UINT8 *byte_ptr = ((UINT8 *) ptr) + offset; UINT16 val16; UINT32 val32; switch(size) { case 2: val16 = LITTLE_ENDIANIZE_INT16((UINT16) value); memcpy(byte_ptr, &val16, sizeof(val16)); break; case 4: val32 = LITTLE_ENDIANIZE_INT32((UINT32) value); memcpy(byte_ptr, &val32, sizeof(val32)); break; default: if (size >= 1) byte_ptr[0] = (UINT8) (value >> (0 * 8)); if (size >= 2) byte_ptr[1] = (UINT8) (value >> (1 * 8)); if (size >= 3) byte_ptr[2] = (UINT8) (value >> (2 * 8)); if (size >= 4) byte_ptr[3] = (UINT8) (value >> (3 * 8)); if (size >= 5) byte_ptr[4] = (UINT8) (value >> (4 * 8)); if (size >= 6) byte_ptr[5] = (UINT8) (value >> (5 * 8)); if (size >= 7) byte_ptr[6] = (UINT8) (value >> (6 * 8)); if (size >= 8) byte_ptr[7] = (UINT8) (value >> (7 * 8)); break; } } INLINE UINT64 pick_integer_le(const void *ptr, size_t offset, size_t size) { UINT64 result = 0; const UINT8 *byte_ptr = ((const UINT8 *) ptr) + offset; UINT16 val16; UINT32 val32; switch(size) { case 1: result = *byte_ptr; break; case 2: memcpy(&val16, byte_ptr, sizeof(val16)); result = LITTLE_ENDIANIZE_INT16(val16); break; case 4: memcpy(&val32, byte_ptr, sizeof(val32)); result = LITTLE_ENDIANIZE_INT32(val32); break; default: if (size >= 1) result |= ((UINT64) byte_ptr[0]) << (0 * 8); if (size >= 2) result |= ((UINT64) byte_ptr[1]) << (1 * 8); if (size >= 3) result |= ((UINT64) byte_ptr[2]) << (2 * 8); if (size >= 4) result |= ((UINT64) byte_ptr[3]) << (3 * 8); if (size >= 5) result |= ((UINT64) byte_ptr[4]) << (4 * 8); if (size >= 6) result |= ((UINT64) byte_ptr[5]) << (5 * 8); if (size >= 7) result |= ((UINT64) byte_ptr[6]) << (6 * 8); if (size >= 8) result |= ((UINT64) byte_ptr[7]) << (7 * 8); break; } return result; } /* ----------------------------------------------------------------------- * Miscellaneous * ----------------------------------------------------------------------- */ /* miscellaneous functions */ int compute_log2(int val); /* ----------------------------------------------------------------------- * Extension list handling * ----------------------------------------------------------------------- */ int image_find_extension(const char *extensions, const char *ext); void image_specify_extension(char *buffer, size_t buffer_len, const char *extension); #endif /* __IMAGEUTL_H__ */