/*----------------------------------------------------------------------------
 *
 * File: 
 * eas_hostmm.c
 *
 * Contents and purpose:
 * This file contains the host wrapper functions for stdio, stdlib, etc.
 * This is a sample version that maps the requested files to an
 * allocated memory block and uses in-memory pointers to replace
 * file system calls. The file locator (EAS_FILE_LOCATOR) handle passed
 * HWOpenFile is the same one that is passed to EAS_OpenFile. If your
 * system stores data in fixed locations (such as flash) instead of
 * using a file system, you can use the locator handle to point to
 * your memory. You will need a way of knowing the length of the
 * data stored at that location in order to respond correctly in the
 * HW_FileLength function.
 * 
 * Modify this file to suit the needs of your particular system.
 *
 * EAS_MAX_FILE_HANDLES sets the maximum number of MIDI streams within
 * a MIDI type 1 file that can be played. 
 *
 * EAS_HW_FILE is a structure to support the file I/O functions. It
 * comprises the base memory pointer, the file read pointer, and
 * the dup flag, which when sets, indicates that the file handle has
 * been duplicated. If your system uses in-memory resources, you
 * can eliminate the duplicate handle logic, and simply copy the 
 * base memory pointer and file read pointer to the duplicate handle.
 *
 * Copyright 2005 Sonic Network Inc.

 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *----------------------------------------------------------------------------
 * Revision Control:
 *   $Revision: 795 $
 *   $Date: 2007-08-01 00:14:45 -0700 (Wed, 01 Aug 2007) $
 *----------------------------------------------------------------------------
*/

#ifdef _lint
#include "lint_stdlib.h"
#else
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif

#include "eas_host.h"

/* Only for debugging LED, vibrate, and backlight functions */
#include "eas_report.h"

/* this module requires dynamic memory support */
#ifdef _STATIC_MEMORY
#error "eas_hostmm.c requires the dynamic memory model!\n"
#endif

#ifndef EAS_MAX_FILE_HANDLES
#define EAS_MAX_FILE_HANDLES	32
#endif

/* 
 * this structure and the related function are here
 * to support the ability to create duplicate handles
 * and buffering it in memory. If your system uses
 * in-memory resources, you can eliminate the calls
 * to malloc and free, the dup flag, and simply track
 * the file size and read position.
 */
typedef struct eas_hw_file_tag
{
	EAS_I32 fileSize;
	EAS_I32 filePos;
	EAS_BOOL dup;
	EAS_U8 *buffer;
} EAS_HW_FILE;

typedef struct eas_hw_inst_data_tag
{
	EAS_HW_FILE files[EAS_MAX_FILE_HANDLES];
} EAS_HW_INST_DATA;

/*----------------------------------------------------------------------------
 * EAS_HWInit
 *
 * Initialize host wrapper interface
 *
 *----------------------------------------------------------------------------
*/
EAS_RESULT EAS_HWInit (EAS_HW_DATA_HANDLE *pHWInstData)
{

	/* need to track file opens for duplicate handles */
	*pHWInstData = malloc(sizeof(EAS_HW_INST_DATA));
	if (!(*pHWInstData))
		return EAS_ERROR_MALLOC_FAILED;
	
	EAS_HWMemSet(*pHWInstData, 0, sizeof(EAS_HW_INST_DATA));
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 * EAS_HWShutdown
 *
 * Shut down host wrapper interface
 *
 *----------------------------------------------------------------------------
*/
EAS_RESULT EAS_HWShutdown (EAS_HW_DATA_HANDLE hwInstData)
{

	free(hwInstData);
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWMalloc
 *
 * Allocates dynamic memory
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
void *EAS_HWMalloc (EAS_HW_DATA_HANDLE hwInstData, EAS_I32 size)
{
	return malloc((size_t) size);
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWFree
 *
 * Frees dynamic memory
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
void EAS_HWFree (EAS_HW_DATA_HANDLE hwInstData, void *p)
{
	free(p);
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWMemCpy
 *
 * Copy memory wrapper
 *
 *----------------------------------------------------------------------------
*/
void *EAS_HWMemCpy (void *dest, const void *src, EAS_I32 amount) 
{
	return memcpy(dest, src, (size_t) amount);
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWMemSet
 *
 * Set memory wrapper
 *
 *----------------------------------------------------------------------------
*/
void *EAS_HWMemSet (void *dest, int val, EAS_I32 amount) 
{
 	return memset(dest, val, (size_t) amount);
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWMemCmp
 *
 * Compare memory wrapper
 *
 *----------------------------------------------------------------------------
*/
EAS_I32 EAS_HWMemCmp (const void *s1, const void *s2, EAS_I32 amount) 
{
	return (EAS_I32) memcmp(s1, s2, (size_t) amount);
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWOpenFile
 *
 * Open a file for read or write
 *
 *----------------------------------------------------------------------------
*/
EAS_RESULT EAS_HWOpenFile (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_LOCATOR locator, EAS_FILE_HANDLE *pFile, EAS_FILE_MODE mode)
{
	EAS_HW_FILE *file;
	FILE *ioFile;
	int i, temp;

	/* set return value to NULL */
	*pFile = NULL;

	/* only support read mode at this time */
	if (mode != EAS_FILE_READ)
		return EAS_ERROR_INVALID_FILE_MODE;

	/* find an empty entry in the file table */
	file = hwInstData->files;
	for (i = 0; i < EAS_MAX_FILE_HANDLES; i++)
	{
		/* is this slot being used? */
		if (file->buffer == NULL)
		{
			/* open the file */
			if ((ioFile = fopen(locator,"rb")) == NULL)
				return EAS_ERROR_FILE_OPEN_FAILED;

			/* determine the file size */
			if (fseek(ioFile, 0L, SEEK_END) != 0)
				return EAS_ERROR_FILE_LENGTH;
			if ((file->fileSize = ftell(ioFile)) == -1L)
				return EAS_ERROR_FILE_LENGTH;
			if (fseek(ioFile, 0L, SEEK_SET) != 0)
				return EAS_ERROR_FILE_LENGTH;

			/* allocate a buffer */
			file->buffer = EAS_HWMalloc(hwInstData, file->fileSize);
			if (file->buffer == NULL)
			{
				fclose(ioFile);
				return EAS_ERROR_MALLOC_FAILED;
			}

			/* read the file into memory */
			temp = (int) fread(file->buffer, (size_t) file->fileSize, 1, ioFile);
			
			/* close the file - don't need it any more */
			fclose(ioFile);

			/* check for error reading file */
			if (temp != 1)
				return EAS_ERROR_FILE_READ_FAILED;
			
			/* initialize some values */
			file->filePos = 0;
			file->dup = EAS_FALSE;

			*pFile = file;
			return EAS_SUCCESS;
		}
		file++;
	}

	/* too many open files */
	return EAS_ERROR_MAX_FILES_OPEN;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWReadFile
 *
 * Read data from a file
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWReadFile (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, void *pBuffer, EAS_I32 n, EAS_I32 *pBytesRead)
{
	EAS_I32 count;

	/* make sure we have a valid handle */
	if (file->buffer == NULL)
		return EAS_ERROR_INVALID_HANDLE;

	/* calculate the bytes to read */
	count = file->fileSize - file->filePos;
	if (n < count)
		count = n;

	/* copy the data to the requested location, and advance the pointer */
	if (count)
		EAS_HWMemCpy(pBuffer, &file->buffer[file->filePos], count);
	file->filePos += count;
	*pBytesRead = count;

	/* were n bytes read? */
	if (count!= n)
		return EAS_EOF;
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWGetByte
 *
 * Read a byte from a file
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWGetByte (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, void *p)
{

	/* make sure we have a valid handle */
	if (file->buffer == NULL)
		return EAS_ERROR_INVALID_HANDLE;

	/* check for end of file */
	if (file->filePos >= file->fileSize)
	{
		*((EAS_U8*) p) = 0;
		return EAS_EOF;
	}

	/* get a character from the buffer */
	*((EAS_U8*) p) = file->buffer[file->filePos++];
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWGetWord
 *
 * Returns the current location in the file 
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWGetWord (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, void *p, EAS_BOOL msbFirst)
{
	EAS_RESULT result;
	EAS_U8 c1, c2;

	/* read 2 bytes from the file */
	if ((result = EAS_HWGetByte(hwInstData, file, &c1)) != EAS_SUCCESS)
		return result;
	if ((result = EAS_HWGetByte(hwInstData, file, &c2)) != EAS_SUCCESS)
		return result;

	/* order them as requested */
	if (msbFirst)
		*((EAS_U16*) p) = ((EAS_U16) c1 << 8) | c2;
	else
		*((EAS_U16*) p) = ((EAS_U16) c2 << 8) | c1;
	
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWGetDWord
 *
 * Returns the current location in the file 
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWGetDWord (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, void *p, EAS_BOOL msbFirst)
{
	EAS_RESULT result;
	EAS_U8 c1, c2,c3,c4;

	/* read 4 bytes from the file */
	if ((result = EAS_HWGetByte(hwInstData, file, &c1)) != EAS_SUCCESS)
		return result;
	if ((result = EAS_HWGetByte(hwInstData, file, &c2)) != EAS_SUCCESS)
		return result;
	if ((result = EAS_HWGetByte(hwInstData, file, &c3)) != EAS_SUCCESS)
		return result;
	if ((result = EAS_HWGetByte(hwInstData, file, &c4)) != EAS_SUCCESS)
		return result;

	/* order them as requested */
	if (msbFirst)
		*((EAS_U32*) p) = ((EAS_U32) c1 << 24) | ((EAS_U32) c2 << 16) | ((EAS_U32) c3 << 8) | c4;
	else
		*((EAS_U32*) p)= ((EAS_U32) c4 << 24) | ((EAS_U32) c3 << 16) | ((EAS_U32) c2 << 8) | c1;
	
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWFilePos
 *
 * Returns the current location in the file 
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWFilePos (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, EAS_I32 *pPosition)
{

	/* make sure we have a valid handle */
	if (file->buffer == NULL)
		return EAS_ERROR_INVALID_HANDLE;
	
	*pPosition = file->filePos;
	return EAS_SUCCESS;
} /* end EAS_HWFilePos */

/*----------------------------------------------------------------------------
 *
 * EAS_HWFileSeek
 *
 * Seek to a specific location in the file
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWFileSeek (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, EAS_I32 position)
{

	/* make sure we have a valid handle */
	if (file->buffer == NULL)
		return EAS_ERROR_INVALID_HANDLE;

	/* validate new position */	
	if ((position < 0) || (position > file->fileSize))
		return EAS_ERROR_FILE_SEEK;

	/* save new position */
	file->filePos = position;
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWFileSeekOfs
 *
 * Seek forward or back relative to the current position
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWFileSeekOfs (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, EAS_I32 position)
{

	/* make sure we have a valid handle */
	if (file->buffer == NULL)
		return EAS_ERROR_INVALID_HANDLE;

	/* determine the file position */	
	position += file->filePos;
	if ((position < 0) || (position > file->fileSize))
		return EAS_ERROR_FILE_SEEK;

	/* save new position */
	file->filePos = position;
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWFileLength
 *
 * Return the file length
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWFileLength (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, EAS_I32 *pLength)
{
	
	/* make sure we have a valid handle */
	if (file->buffer == NULL)
		return EAS_ERROR_INVALID_HANDLE;
	
	*pLength = file->fileSize;
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWDupHandle
 *
 * Duplicate a file handle
 *
 *----------------------------------------------------------------------------
*/
EAS_RESULT EAS_HWDupHandle (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file, EAS_FILE_HANDLE *pDupFile)
{
	EAS_HW_FILE *dupFile;
	int i;

	/* make sure we have a valid handle */
	if (file->buffer == NULL)
		return EAS_ERROR_INVALID_HANDLE;

	/* find an empty entry in the file table */
	dupFile = hwInstData->files;
	for (i = 0; i < EAS_MAX_FILE_HANDLES; i++)
	{
		/* is this slot being used? */
		if (dupFile->buffer == NULL)
		{

			/* copy info from the handle to be duplicated */
			dupFile->filePos = file->filePos;
			dupFile->fileSize = file->fileSize;
			dupFile->buffer = file->buffer;

			/* set the duplicate handle flag */
			dupFile->dup = file->dup = EAS_TRUE;

			*pDupFile = dupFile;
			return EAS_SUCCESS;
		}
		dupFile++;
	}

	/* too many open files */
	return EAS_ERROR_MAX_FILES_OPEN;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWClose
 *
 * Wrapper for fclose function
 *
 *----------------------------------------------------------------------------
*/
EAS_RESULT EAS_HWCloseFile (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE file1)
{
	EAS_HW_FILE *file2,*dupFile;
	int i;


	/* make sure we have a valid handle */
	if (file1->buffer == NULL)
		return EAS_ERROR_INVALID_HANDLE;

	/* check for duplicate handle */
	if (file1->dup)
	{
		dupFile = NULL;
		file2 = hwInstData->files;
		for (i = 0; i < EAS_MAX_FILE_HANDLES; i++)
		{
			/* check for duplicate */
			if ((file1 != file2) && (file2->buffer == file1->buffer))
			{
				/* is there more than one duplicate? */
				if (dupFile != NULL)
				{
					/* clear this entry and return */
					file1->buffer = NULL;
					return EAS_SUCCESS;
				}

				/* this is the first duplicate found */
				else
					dupFile = file2;
			}
			file2++;
		}

		/* there is only one duplicate, clear the dup flag */
		if (dupFile)
			dupFile->dup = EAS_FALSE;
		else
			/* if we get here, there's a serious problem */
			return EAS_ERROR_HANDLE_INTEGRITY;

		/* clear this entry and return */
		file1->buffer = NULL;
		return EAS_SUCCESS;
	}

	/* no duplicates -free the buffer */
	EAS_HWFree(hwInstData, file1->buffer);

	/* clear this entry and return */
	file1->buffer = NULL;
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWVibrate
 *
 * Turn on/off vibrate function
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWVibrate (EAS_HW_DATA_HANDLE hwInstData, EAS_BOOL state)
{
	EAS_ReportEx(_EAS_SEVERITY_NOFILTER, 0x1a54b6e8, 0x00000001 , state);
	return EAS_SUCCESS;
} /* end EAS_HWVibrate */

/*----------------------------------------------------------------------------
 *
 * EAS_HWLED
 *
 * Turn on/off LED
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWLED (EAS_HW_DATA_HANDLE hwInstData, EAS_BOOL state)
{
	EAS_ReportEx(_EAS_SEVERITY_NOFILTER, 0x1a54b6e8, 0x00000002 , state);
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWBackLight
 *
 * Turn on/off backlight
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_RESULT EAS_HWBackLight (EAS_HW_DATA_HANDLE hwInstData, EAS_BOOL state)
{
	EAS_ReportEx(_EAS_SEVERITY_NOFILTER, 0x1a54b6e8, 0x00000003 , state);
	return EAS_SUCCESS;
}

/*----------------------------------------------------------------------------
 *
 * EAS_HWYield
 *
 * This function is called periodically by the EAS library to give the
 * host an opportunity to allow other tasks to run. There are two ways to
 * use this call:
 *
 * If you have a multi-tasking OS, you can call the yield function in the
 * OS to allow other tasks to run. In this case, return EAS_FALSE to tell
 * the EAS library to continue processing when control returns from this
 * function.
 *
 * If tasks run in a single thread by sequential function calls (sometimes
 * call a "commutator loop"), return EAS_TRUE to cause the EAS Library to
 * return to the caller. Be sure to check the number of bytes rendered
 * before passing the audio buffer to the codec - it may not be filled.
 * The next call to EAS_Render will continue processing until the buffer
 * has been filled.
 *
 *----------------------------------------------------------------------------
*/
/*lint -esym(715, hwInstData) hwInstData available for customer use */
EAS_BOOL EAS_HWYield (EAS_HW_DATA_HANDLE hwInstData)
{
	/* put your code here */
	return EAS_FALSE;
}