/*lint -esym(715, 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;
/* simulate failure */
if (errorConditions[eReadError])
return EAS_FAILURE;
/* 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;
}
/*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_RESULT result;
EAS_I32 temp;
EAS_U8 *p = pBuffer;
EAS_I32 bytesLeft = n;
*pBytesRead = 0;
/* check handle integrity */
if (file->pFile == NULL)
return EAS_ERROR_INVALID_HANDLE;
#ifdef DEBUG_FILE_IO
EAS_ReportX(_EAS_SEVERITY_NOFILTER, "EAS_HWReadFile: Reading %d bytes from position %d\n", n, file->filePos);
#endif
/* try to fulfill request from buffer */
for (; bytesLeft > 0;)
{
/* how many bytes can we get from buffer? */
temp = file->bytesInBuffer - file->readIndex;
if (temp > bytesLeft)
temp = bytesLeft;
/* copy data from buffer */
EAS_HWMemCpy(p, &file->buffer[file->readIndex], temp);
*pBytesRead += temp;
file->readIndex += temp;
file->filePos += temp;
bytesLeft -= temp;
p += temp;
/* don't refill buffer if request is bigger than buffer */
if ((bytesLeft == 0) || (bytesLeft >= EAS_FILE_BUFFER_SIZE))
break;
/* refill buffer */
if ((result = EAS_HWFillBuffer(hwInstData, file)) != EAS_SUCCESS)
return result;
}
/* more to read? do unbuffered read directly to target memory */
if (bytesLeft)
{
/* position the file pointer */
if (fseek(file->pFile, file->filePos, SEEK_SET) != 0)
return EAS_ERROR_FILE_SEEK;
/* read data in the buffer */
/*lint -e{826} lint doesn't like this with STATIC_MEMORY defined for some reason */
temp = (EAS_I32) fread(p, 1, (size_t) bytesLeft, file->pFile);
*pBytesRead += temp;
file->filePos += temp;
/* reset buffer info */
file->bytesInBuffer = 0;
file->readIndex = 0;
}
#ifdef DEBUG_FILE_IO
{
#define BYTES_PER_LINE 16
char str[BYTES_PER_LINE * 3 + 1];
EAS_INT i;
for (i = 0; i < (n > BYTES_PER_LINE ? BYTES_PER_LINE : n) ; i ++)
sprintf(&str[i*3], "%02x ", ((EAS_U8*)pBuffer)[i]);
if (i)
EAS_ReportX(_EAS_SEVERITY_NOFILTER, "%s\n", str);
}
#endif
/* were n bytes read? */
if (*pBytesRead != n)
return EAS_EOF;
return EAS_SUCCESS;
}
