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+/***************************************************************************
+
+ imageutl.h
+
+ Image related utilities
+
+****************************************************************************
+
+ Copyright Aaron Giles
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name 'MAME' nor the names of its contributors may be
+ used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
+ IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
+ INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+***************************************************************************/
+
+#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__ */