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#include <linux/fs.h>
#include <asm/segment.h>
#include <linux/uaccess.h>
#include <linux/buffer_head.h>
#include "tz_fileio.h"
/** FILE_Open
* Open a file for read or write
*
* @param path File path to open
* @param flags Access flag see open(2)
* @param mode The mode/permission for created file, see open(2)
* @retval File handle
*/
struct file *FILE_Open(const char *path, int flags, int mode)
{
struct file *filp = NULL;
mm_segment_t oldfs;
int err = 0;
oldfs = get_fs();
set_fs(get_ds());
filp = filp_open(path, flags, mode);
set_fs(oldfs);
if (IS_ERR(filp)) {
err = PTR_ERR(filp);
return NULL;
}
return filp;
}
/** FILE_Read
* Read data from a file.
*
* @param file Opened file handle
* @param offset Pointer to begin offset to read.
* @param data user's buffer address.
* @param size readdata length in bytes.
* @retval >0 SUCCESS, return actual bytes read.
* @retval <0 Fail, errno
*/
int FILE_Read(struct file *file, unsigned char *data, unsigned int size, unsigned long long *offset)
{
mm_segment_t oldfs;
int ret;
oldfs = get_fs();
set_fs(get_ds());
ret = vfs_read(file, data, size, offset);
set_fs(oldfs);
return ret;
}
/** FILE_Write
* Write data from a file.
*
* @param file Opened file handle
* @param offset Pointer to begin offset to Write.
* @param data user's buffer address.
* @param size Writedata length in bytes.
* @retval >0 SUCCESS, return actual bytes Write.
* @retval <0 Fail, errno
*/
int FILE_Write(struct file *file, unsigned char *data, unsigned int size, unsigned long long *offset)
{
mm_segment_t oldfs;
int ret;
oldfs = get_fs();
set_fs(get_ds());
ret = vfs_write(file, data, size, offset);
set_fs(oldfs);
return ret;
}
/** FILE_ReadData
* Read data from a file.
*
* @param path File path name to read.
* @param u4Offset begin offset to read.
* @param pData user's buffer address.
* @param i4Length readdata length in bytes.
* @retval >0 SUCCESS, return actual bytes read.
* @retval <0 Fail, errno
*/
int FILE_ReadData(const char *path, unsigned int u4Offset, char *pData, int i4Length)
{
struct file *file = NULL;
UINT64 u8Offset = (UINT64)u4Offset;
file = FILE_Open(path, O_RDONLY, 0);
if (!file)
return -EFAULT;
i4Length = FILE_Read(file, (void *)pData, i4Length, &u8Offset);
filp_close(file, NULL);
return i4Length;
}
/** FILE_WriteData
* Write data to a file.
*
* @param path File path name to write.
* @param u4Offset begin offset to write.
* @param pData user's buffer address.
* @param i4Length writedata length in bytes.
* @retval >0 SUCCESS, return actual bytes writen.
* @retval <0 Fail, errno
*/
int FILE_WriteData(const char *path, unsigned int u4Offset, char *pData, int i4Length)
{
struct file *file = NULL;
UINT64 u8Offset = (UINT64)u4Offset;
file = FILE_Open(path, O_WRONLY|O_CREAT, 0644);
if (!file)
return -EFAULT;
i4Length = FILE_Write(file, (void *)pData, i4Length, &u8Offset);
filp_close(file, NULL);
return i4Length;
}
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