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Added PXENV_GET_FILE_SIZE.

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Documented non-blocking nature of PXENV_FILE_READ.

Changed FileName field in PXENV_FILE_OPEN to be a SEGOFF16, to avoid a
fixed 256-byte length limit on URLs.
This commit is contained in:
Michael Brown 2007-07-06 13:31:40 +01:00
parent f660e8ef58
commit bfc335faa8
1 changed files with 43 additions and 1 deletions
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44
src/doc/pxe_extensions
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@ -17,8 +17,8 @@ Description: Opens a file specified by a URL for reading. Multiple
typedef struct s_PXENV_FILE_OPEN {
PXENV_STATUS Status;
UINT16 FileHandle;
SEGOFF16 FileName;
UINT32 Reserved;
UINT8 FileName[256];
} t_PXENV_FILE_OPEN;
@ -122,6 +122,12 @@ Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
This API function is non-blocking. PXENV_EXIT_SUCCESS
and PXENV_STATUS_SUCCESS is returned if a data block
has been transferred into the caller's buffer.
PXENV_EXIT_FAILURE and PXENV_STATUS_FAILURE is
returned if no data is available to transfer.
Description: Read from a previously opened file.
@ -149,3 +155,39 @@ BufferSize: Number of bytes written to the data buffer. End of
file if this is zero.
Status: See PXENV_STATUS_xxx constants.
GET FILE SIZE
Op-Code: PXENV_GET_FILE_SIZE (00e4h)
Input: Far pointer to a t_PXENV_GET_FILE_SIZE parameter
structure that has been initialised by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be
returned in AX. The status field in the parameter
structure must be set to one of the values represented
by the PXENV_STATUS_xxx constants.
Description: Determine size of a previously opened file.
typedef struct s_PXENV_GET_FILE_SIZE {
PXENV_STATUS Status;
UINT16 FileHandle;
UINT32 FileSize;
} t_PXENV_GET_FILE_SIZE;
Set before calling API service:
FileHandle: Handle obtained when file was opened.
Returned from API service:
FileSize: Size of the file in bytes.
Status: See PXENV_STATUS_xxx constants.