/*----------------------------------------------------------------------------
*
* File:
* eas_xmf.c
* 5
* Contents and purpose:
* XMF File Parser
*
* Copyright Sonic Network Inc. 2005
* 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: 501 $
* $Date: 2006-12-11 17:53:36 -0800 (Mon, 11 Dec 2006) $
*----------------------------------------------------------------------------
*/
#include <log/log.h>
#include "eas_data.h"
#include "eas_miditypes.h"
#include "eas_parser.h"
#include "eas_report.h"
#include "eas_host.h"
#include "eas_midi.h"
#include "eas_xmf.h"
#include "eas_xmfdata.h"
#include "eas_config.h"
#include "eas_vm_protos.h"
#include "eas_mdls.h"
#include "eas_smf.h"
/* XMF header file type */
#define XMF_IDENTIFIER 0x584d465f
#define XMF_VERSION_1_00 0x312e3030
#define XMF_VERSION_1_01 0x312e3031
#define XMF_VERSION_2_00 0x322e3030
#define XMF_FILE_TYPE 0x00000002
#define XMF_SPEC_LEVEL 0x00000001
#define XMF_RIFF_CHUNK 0x52494646
#define XMF_RIFF_DLS 0x444c5320
#define XMF_SMF_CHUNK 0x4d546864
/* local prototypes */
static EAS_RESULT XMF_CheckFileType (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, EAS_VOID_PTR *ppHandle, EAS_I32 offset);
static EAS_RESULT XMF_Prepare (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT XMF_Time (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_U32 *pTime);
static EAS_RESULT XMF_Event (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_INT parserMode);
static EAS_RESULT XMF_State (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_STATE *pState);
static EAS_RESULT XMF_Close (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT XMF_Reset (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT XMF_Pause (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT XMF_Resume (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT XMF_SetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 value);
static EAS_RESULT XMF_GetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 *pValue);
static EAS_RESULT XMF_FindFileContents (EAS_HW_DATA_HANDLE hwInstData, S_XMF_DATA *pXMFData);
static EAS_RESULT XMF_ReadNode (EAS_HW_DATA_HANDLE hwInstData, S_XMF_DATA *pXMFData, EAS_I32 nodeOffset, EAS_I32 *pLength);
static EAS_RESULT XMF_ReadVLQ (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE fileHandle, EAS_I32 *value);
/*----------------------------------------------------------------------------
*
* XMF_Parser
*
* This structure contains the functional interface for the XMF parser
*----------------------------------------------------------------------------
*/
const S_FILE_PARSER_INTERFACE EAS_XMF_Parser =
{
XMF_CheckFileType,
XMF_Prepare,
XMF_Time,
XMF_Event,
XMF_State,
XMF_Close,
XMF_Reset,
XMF_Pause,
XMF_Resume,
NULL,
XMF_SetData,
XMF_GetData,
NULL
};
/*----------------------------------------------------------------------------
* XMF_CheckFileType()
*----------------------------------------------------------------------------
* Purpose:
* Check the file type to see if we can parse it
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_CheckFileType (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, EAS_VOID_PTR *ppHandle, EAS_I32 offset)
{
S_XMF_DATA *pXMFData;
EAS_RESULT result;
EAS_U32 temp;
/* assume we don't recognize it initially */
*ppHandle = NULL;
/* read the file identifier */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &temp, EAS_TRUE)) != EAS_SUCCESS)
return result;
if (temp != XMF_IDENTIFIER)
return EAS_SUCCESS;
/* read the version */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &temp, EAS_TRUE)) != EAS_SUCCESS)
return result;
if (temp == XMF_VERSION_2_00)
{
/* read the file type */
result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &temp, EAS_TRUE);
if (result != EAS_SUCCESS)
return result;
if (temp != XMF_FILE_TYPE)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR,
"XMF file type was 0x%08x, expected 0x%08x\n", temp, XMF_FILE_TYPE); */ }
return EAS_SUCCESS;
}
/* read the spec level */
result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &temp, EAS_TRUE);
if (result != EAS_SUCCESS)
return result;
if (temp != XMF_SPEC_LEVEL)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR,
"XMF file spec was 0x%08x, expected 0x%08x\n", temp, XMF_SPEC_LEVEL); */ }
return EAS_SUCCESS;
}
}
else if (temp != XMF_VERSION_1_00 && temp != XMF_VERSION_1_01)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "XMF file version was 0x%08x\n", temp); */ }
return EAS_SUCCESS;
}
/* check for static memory allocation */
if (pEASData->staticMemoryModel)
pXMFData = EAS_CMEnumData(EAS_CM_XMF_DATA);
else
pXMFData = EAS_HWMalloc(pEASData->hwInstData, sizeof(S_XMF_DATA));
if (!pXMFData)
return EAS_ERROR_MALLOC_FAILED;
/* zero the memory to insure complete initialization */
EAS_HWMemSet((void *)pXMFData,0, sizeof(S_XMF_DATA));
pXMFData->fileHandle = fileHandle;
pXMFData->fileOffset = offset;
*ppHandle = pXMFData;
/* locate the SMF and DLS contents */
if ((result = XMF_FindFileContents(pEASData->hwInstData, pXMFData)) != EAS_SUCCESS)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "No SMF data found in XMF file\n"); */ }
return result;
}
/* let the SMF parser take over */
if ((result = EAS_HWFileSeek(pEASData->hwInstData, fileHandle, pXMFData->midiOffset)) != EAS_SUCCESS)
return result;
return SMF_CheckFileType(pEASData, fileHandle, &pXMFData->pSMFData, pXMFData->midiOffset);
}
/*----------------------------------------------------------------------------
* XMF_Prepare()
*----------------------------------------------------------------------------
* Purpose:
* Prepare to parse the file. Allocates instance data (or uses static allocation for
* static memory model).
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_Prepare (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
S_XMF_DATA* pXMFData;
EAS_RESULT result;
/* parse DLS collection */
pXMFData = (S_XMF_DATA*) pInstData;
if (pXMFData->dlsOffset != 0)
{
if ((result = DLSParser(pEASData->hwInstData, pXMFData->fileHandle, pXMFData->dlsOffset, &pXMFData->pDLS)) != EAS_SUCCESS)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_WARNING, "Error converting XMF DLS data\n"); */ }
return result;
}
}
/* Prepare the SMF parser */
if ((result = SMF_Prepare(pEASData, pXMFData->pSMFData)) != EAS_SUCCESS)
return result;
/* if no DLS file, skip this step */
if (pXMFData->pDLS == NULL)
return EAS_SUCCESS;
/* tell the synth to use the DLS collection */
result = VMSetDLSLib(((S_SMF_DATA*) pXMFData->pSMFData)->pSynth, pXMFData->pDLS);
if (result == EAS_SUCCESS)
{
DLSAddRef(pXMFData->pDLS);
VMInitializeAllChannels(pEASData->pVoiceMgr, ((S_SMF_DATA*) pXMFData->pSMFData)->pSynth);
}
return result;
}
/*----------------------------------------------------------------------------
* XMF_Time()
*----------------------------------------------------------------------------
* Purpose:
* Returns the time of the next event in msecs
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
* pTime - pointer to variable to hold time of next event (in msecs)
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_Time (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_U32 *pTime)
{
return SMF_Time(pEASData, ((S_XMF_DATA*) pInstData)->pSMFData, pTime);
}
/*----------------------------------------------------------------------------
* XMF_Event()
*----------------------------------------------------------------------------
* Purpose:
* Parse the next event in the file
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_Event (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_INT parserMode)
{
return SMF_Event(pEASData, ((S_XMF_DATA*) pInstData)->pSMFData, parserMode);
}
/*----------------------------------------------------------------------------
* XMF_State()
*----------------------------------------------------------------------------
* Purpose:
* Returns the current state of the stream
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
* pState - pointer to variable to store state
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_State (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 *pState)
{
return SMF_State(pEASData, ((S_XMF_DATA*) pInstData)->pSMFData, pState);
}
/*----------------------------------------------------------------------------
* XMF_Close()
*----------------------------------------------------------------------------
* Purpose:
* Close the file and clean up
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_Close (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
S_XMF_DATA* pXMFData;
EAS_RESULT result;
pXMFData = (S_XMF_DATA *)pInstData;
/* close the SMF stream, it will close the file handle */
if ((result = SMF_Close(pEASData, pXMFData->pSMFData)) != EAS_SUCCESS)
return result;
if (pXMFData->pDLS)
DLSCleanup(pEASData->hwInstData, pXMFData->pDLS);
/* if using dynamic memory, free it */
if (!pEASData->staticMemoryModel)
{
/* free the instance data */
EAS_HWFree(pEASData->hwInstData, pXMFData);
}
return EAS_SUCCESS;
}
/*----------------------------------------------------------------------------
* XMF_Reset()
*----------------------------------------------------------------------------
* Purpose:
* Reset the sequencer. Used for locating backwards in the file.
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_Reset (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
return SMF_Reset(pEASData, ((S_XMF_DATA*) pInstData)->pSMFData);
}
/*----------------------------------------------------------------------------
* XMF_Pause()
*----------------------------------------------------------------------------
* Purpose:
* Pauses the sequencer. Mutes all voices and sets state to pause.
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_Pause (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
return SMF_Pause(pEASData, ((S_XMF_DATA*) pInstData)->pSMFData);
}
/*----------------------------------------------------------------------------
* XMF_Resume()
*----------------------------------------------------------------------------
* Purpose:
* Resume playing after a pause, sets state back to playing.
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_Resume (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
return SMF_Resume(pEASData, ((S_XMF_DATA*) pInstData)->pSMFData);
}
/*----------------------------------------------------------------------------
* XMF_SetData()
*----------------------------------------------------------------------------
* Purpose:
* Sets the playback rate of the underlying SMF file
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
* rate - rate (28-bit fraction)
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_SetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 value)
{
return SMF_SetData(pEASData, ((S_XMF_DATA*) pInstData)->pSMFData, param, value);
}
/*----------------------------------------------------------------------------
* XMF_GetData()
*----------------------------------------------------------------------------
* Purpose:
* Gets the file type
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
* rate - rate (28-bit fraction)
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_GetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 *pValue)
{
EAS_RESULT result;
/* call SMF parser to get value */
if ((result = SMF_GetData(pEASData, ((S_XMF_DATA*) pInstData)->pSMFData, param, pValue)) != EAS_SUCCESS)
return result;
/* special case for file type */
if (param == PARSER_DATA_FILE_TYPE)
{
if (*pValue == EAS_FILE_SMF0)
*pValue = EAS_FILE_XMF0;
else if (*pValue == EAS_FILE_SMF1)
*pValue = EAS_FILE_XMF1;
}
return EAS_SUCCESS;
}
/*----------------------------------------------------------------------------
* XMF_FindFileContents()
*----------------------------------------------------------------------------
* Purpose:
* Finds SMF data and DLS data in XMF file, and remembers offset for each.
* If more than one is found, uses the first one found of each.
* Makes assumptions about the format of a mobile XMF file
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* pXMFData - pointer to XMF parser instance data
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_FindFileContents (EAS_HW_DATA_HANDLE hwInstData, S_XMF_DATA *pXMFData)
{
EAS_RESULT result;
EAS_I32 value;
EAS_I32 length;
/* initialize offsets */
pXMFData->dlsOffset = pXMFData->midiOffset = 0;
/* read file length, ignore it for now */
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, &value)) != EAS_SUCCESS)
return result;
/* read MetaDataTypesTable length and skip over it */
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, &value)) != EAS_SUCCESS)
return result;
if ((result = EAS_HWFileSeekOfs(hwInstData, pXMFData->fileHandle, value)) != EAS_SUCCESS)
return result;
/* get TreeStart offset and jump to it */
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, &value)) != EAS_SUCCESS)
return result;
if ((result = XMF_ReadNode(hwInstData, pXMFData, value, &length)) != EAS_SUCCESS)
return result;
/* check for SMF data */
if (pXMFData->midiOffset == 0)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "No SMF data found in XMF file\n"); */ }
return EAS_ERROR_FILE_FORMAT;
}
/* check for SFM in wrong order */
if ((pXMFData->dlsOffset > 0) && (pXMFData->midiOffset < pXMFData->dlsOffset))
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_WARNING, "DLS data must precede SMF data in Mobile XMF file\n"); */ }
return EAS_SUCCESS;
}
/*----------------------------------------------------------------------------
* XMF_ReadNode()
*----------------------------------------------------------------------------
* Purpose:
*
* Inputs:
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_ReadNode (EAS_HW_DATA_HANDLE hwInstData, S_XMF_DATA *pXMFData, EAS_I32 nodeOffset, EAS_I32 *pLength)
{
EAS_RESULT result;
EAS_I32 refType;
EAS_I32 numItems;
EAS_I32 offset;
EAS_I32 length;
EAS_I32 headerLength;
EAS_U32 chunkType;
/* seek to start of node */
if ((result = EAS_HWFileSeek(hwInstData, pXMFData->fileHandle, nodeOffset)) != EAS_SUCCESS)
return result;
/* get node length */
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, pLength)) != EAS_SUCCESS)
return result;
/* get number of contained items */
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, &numItems)) != EAS_SUCCESS)
return result;
/* get node header length */
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, &headerLength)) != EAS_SUCCESS)
return result;
/* get metadata length */
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, &length)) != EAS_SUCCESS)
return result;
/* get the current location */
if ((result = EAS_HWFilePos(hwInstData, pXMFData->fileHandle, &offset)) != EAS_SUCCESS)
return result;
if (offset - nodeOffset > headerLength)
return EAS_FAILURE;
/* skip to node contents */
if ((result = EAS_HWFileSeek(hwInstData, pXMFData->fileHandle, nodeOffset + headerLength)) != EAS_SUCCESS)
return result;
/* get reference type */
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, &refType)) != EAS_SUCCESS)
return result;
/* get the current location */
if ((result = EAS_HWFilePos(hwInstData, pXMFData->fileHandle, &offset)) != EAS_SUCCESS)
return result;
/* process file node */
if (numItems == 0)
{
/* if in-file resource, find out where it is and jump to it */
if (refType == 2)
{
if ((result = XMF_ReadVLQ(hwInstData, pXMFData->fileHandle, &offset)) != EAS_SUCCESS)
return result;
offset += pXMFData->fileOffset;
if ((result = EAS_HWFileSeek(hwInstData, pXMFData->fileHandle, offset)) != EAS_SUCCESS)
return result;
}
/* or else it must be an inline resource */
else if (refType != 1)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "Unexpected reference type %d\n", refType); */ }
return EAS_ERROR_FILE_FORMAT;
}
/* get the chunk type */
if ((result = EAS_HWGetDWord(hwInstData, pXMFData->fileHandle, &chunkType, EAS_TRUE)) != EAS_SUCCESS)
return result;
/* found a RIFF chunk, check for DLS type */
if (chunkType == XMF_RIFF_CHUNK)
{
/* skip length */
if ((result = EAS_HWFileSeekOfs(hwInstData, pXMFData->fileHandle, sizeof(EAS_I32))) != EAS_SUCCESS)
return result;
/* get RIFF file type */
if ((result = EAS_HWGetDWord(hwInstData, pXMFData->fileHandle, &chunkType, EAS_TRUE)) != EAS_SUCCESS)
return result;
if (chunkType == XMF_RIFF_DLS)
pXMFData->dlsOffset = offset;
}
/* found an SMF chunk */
else if (chunkType == XMF_SMF_CHUNK)
pXMFData->midiOffset = offset;
}
/* folder node, process the items in the list */
else
{
for ( ; numItems > 0; numItems--)
{
/* process this item */
if (offset <= nodeOffset) {
ALOGE("b/36725407: parser did not advance");
return EAS_ERROR_FILE_FORMAT;
}
if ((result = XMF_ReadNode(hwInstData, pXMFData, offset, &length)) != EAS_SUCCESS)
return result;
/* seek to start of next item */
offset += length;
if ((result = EAS_HWFileSeek(hwInstData, pXMFData->fileHandle, offset)) != EAS_SUCCESS)
return result;
}
}
return EAS_SUCCESS;
}
#if 0
/*----------------------------------------------------------------------------
* XMF_FindFileContents()
*----------------------------------------------------------------------------
* Purpose:
* Finds SMF data and DLS data in XMF file, and remembers offset for each.
* If more than one is found, uses the first one found of each.
* Makes assumptions about the format of a mobile XMF file
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* pXMFData - pointer to XMF parser instance data
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_FindFileContents(S_EAS_DATA *pEASData, S_XMF_DATA *pXMFData, EAS_FILE_HANDLE fileHandle)
{
EAS_RESULT result;
EAS_I32 offset;
EAS_I32 value;
EAS_I32 numItems;
EAS_I32 length;
EAS_CHAR id[4];
EAS_I32 location;
/* init dls offset, so that we know we haven't found a dls chunk yet */
pXMFData->dlsOffset = 0;
/* read file length, ignore it for now */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &value)) != EAS_SUCCESS)
return result;
/* read MetaDataTypesTable length and skip over it */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &value)) != EAS_SUCCESS)
return result;
if ((result = EAS_HWFileSeekOfs(pEASData, fileHandle, value)) != EAS_SUCCESS)
return result;
/* get TreeStart offset and jump to it */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &offset)) != EAS_SUCCESS)
return result;
if ((result = EAS_HWFileSeek(pEASData->hwInstData, fileHandle, offset)) != EAS_SUCCESS)
return result;
/* read node length, ignore it for now */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &value)) != EAS_SUCCESS)
return result;
/* read number of contained items */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &numItems)) != EAS_SUCCESS)
return result;
/*read node header length */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &value)) != EAS_SUCCESS)
return result;
/*go to the node offset */
if ((result = EAS_HWFileSeek(pEASData->hwInstData, fileHandle, offset + value)) != EAS_SUCCESS)
return result;
/* read Reference Type */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &value)) != EAS_SUCCESS)
return result;
/* make sure it is an in-line resource, for now */
if (value != 1)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "Problem parsing XMF file tree\n"); */ }
return EAS_FAILURE;
}
/* parse through the list of items */
while (numItems > 0)
{
/*get current offset */
if ((result = EAS_HWFilePos(pEASData->hwInstData, fileHandle, &offset)) != EAS_SUCCESS)
return result;
/*read node length */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &length)) != EAS_SUCCESS)
return result;
/* read number of items */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &value)) != EAS_SUCCESS)
return result;
/* make sure not a folder */
if (value != 0)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "Problem parsing XMF file node\n"); */ }
return EAS_FAILURE;
}
/* read offset to resource and jump to it */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &value)) != EAS_SUCCESS)
return result;
if ((result = EAS_HWFileSeek(pEASData->hwInstData, fileHandle, offset + value)) != EAS_SUCCESS)
return result;
/* read Reference Type */
if ((result = XMF_ReadVLQ(pEASData, fileHandle, &value)) != EAS_SUCCESS)
return result;
/* make sure it is an in-line resource */
if (value != 1)
{
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "Problem parsing XMF file node\n"); */ }
return EAS_FAILURE;
}
/* get current offset as a possible location for SMF file or DLS file */
if ((result = EAS_HWFilePos(pEASData->hwInstData, fileHandle, &location)) != EAS_SUCCESS)
return result;
/* read four bytes */
if ((result = EAS_HWReadFile(pEASData->hwInstData, fileHandle, id, sizeof(id), &value)) != EAS_SUCCESS)
return result;
/* check if DLS */
if (pXMFData->dlsOffset == 0 && id[0] == 'R' && id[1] == 'I' && id[2] == 'F' && id[3] == 'F')
{
//remember offset
pXMFData->dlsOffset = location;
}
/* else check if SMF */
else if (id[0] == 'M' && id[1] == 'T' && id[2] == 'h' && id[3] == 'd')
{
//remember offset
pXMFData->midiOffset = location;
//we are done
return EAS_SUCCESS;
}
//one less item
numItems--;
//if more data, go to the next item
if (numItems >0)
{
if ((result = EAS_HWFileSeek(pEASData->hwInstData, fileHandle, offset + length)) != EAS_SUCCESS)
return result;
}
}
return EAS_FAILURE;
}
#endif
/*----------------------------------------------------------------------------
* XMF_ReadVLQ()
*----------------------------------------------------------------------------
* Purpose:
* Reads a VLQ encoded value from the file referenced by fileHandle
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* fileHandle - pointer to file handle
*
* Outputs:
* value - pointer to the value decoded from the VLQ data
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT XMF_ReadVLQ (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE fileHandle, EAS_I32 *value)
{
EAS_RESULT result;
EAS_U8 c;
*value = 0;
if ((result = EAS_HWGetByte(hwInstData, fileHandle, &c)) != EAS_SUCCESS)
return result;
while (c > 0x7F)
{
/*lint -e{703} shift for performance */
*value = (*value << 7) | (c & 0x7F);
if ((result = EAS_HWGetByte(hwInstData, fileHandle, &c)) != EAS_SUCCESS)
return result;
}
/*lint -e{703} shift for performance */
*value = (*value << 7) | c;
return EAS_SUCCESS;
}