зеркало из https://github.com/mozilla/gecko-dev.git
212 строки
7.2 KiB
C
212 строки
7.2 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Basic APIs for streaming typelib structures to/from disk.
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*/
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#ifndef __xpt_xdr_h__
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#define __xpt_xdr_h__
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#include "xpt_struct.h"
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PR_BEGIN_EXTERN_C
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typedef struct XPTState XPTState;
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typedef struct XPTDatapool XPTDatapool;
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typedef struct XPTCursor XPTCursor;
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/* Opaque type, for internal use */
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typedef struct XPTHashTable XPTHashTable;
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extern XPT_PUBLIC_API(PRBool)
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XPT_DoString(XPTArena *arena, XPTCursor *cursor, XPTString **strp);
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extern XPT_PUBLIC_API(PRBool)
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XPT_DoStringInline(XPTArena *arena, XPTCursor *cursor, XPTString **strp);
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extern XPT_PUBLIC_API(PRBool)
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XPT_DoCString(XPTArena *arena, XPTCursor *cursor, char **strp);
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extern XPT_PUBLIC_API(PRBool)
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XPT_DoIID(XPTCursor *cursor, nsID *iidp);
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extern XPT_PUBLIC_API(PRBool)
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XPT_Do64(XPTCursor *cursor, PRInt64 *u64p);
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extern XPT_PUBLIC_API(PRBool)
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XPT_Do32(XPTCursor *cursor, PRUint32 *u32p);
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extern XPT_PUBLIC_API(PRBool)
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XPT_Do16(XPTCursor *cursor, PRUint16 *u16p);
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extern XPT_PUBLIC_API(PRBool)
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XPT_Do8(XPTCursor *cursor, PRUint8 *u8p);
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extern XPT_PUBLIC_API(PRBool)
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XPT_DoHeaderPrologue(XPTArena *arena, XPTCursor *cursor, XPTHeader **headerp, PRUint32 * ide_offset);
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extern XPT_PUBLIC_API(PRBool)
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XPT_DoHeader(XPTArena *arena, XPTCursor *cursor, XPTHeader **headerp);
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typedef enum {
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XPT_ENCODE,
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XPT_DECODE
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} XPTMode;
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typedef enum {
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XPT_HEADER = 0,
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XPT_DATA = 1
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} XPTPool;
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struct XPTState {
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XPTMode mode;
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PRUint32 data_offset;
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PRUint32 next_cursor[2];
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XPTDatapool *pool;
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XPTArena *arena;
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};
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struct XPTDatapool {
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XPTHashTable *offset_map;
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char *data;
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PRUint32 count;
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PRUint32 allocated;
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};
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struct XPTCursor {
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XPTState *state;
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XPTPool pool;
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PRUint32 offset;
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PRUint8 bits;
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};
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extern XPT_PUBLIC_API(XPTState *)
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XPT_NewXDRState(XPTMode mode, char *data, PRUint32 len);
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extern XPT_PUBLIC_API(PRBool)
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XPT_MakeCursor(XPTState *state, XPTPool pool, PRUint32 len, XPTCursor *cursor);
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extern XPT_PUBLIC_API(PRBool)
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XPT_SeekTo(XPTCursor *cursor, PRUint32 offset);
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extern XPT_PUBLIC_API(void)
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XPT_DestroyXDRState(XPTState *state);
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/* Set file_length based on the data used in the state. (Only ENCODE.) */
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extern XPT_PUBLIC_API(PRBool)
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XPT_UpdateFileLength(XPTState *state);
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/* returns the length of the specified data block */
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extern XPT_PUBLIC_API(void)
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XPT_GetXDRDataLength(XPTState *state, XPTPool pool, PRUint32 *len);
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extern XPT_PUBLIC_API(void)
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XPT_GetXDRData(XPTState *state, XPTPool pool, char **data, PRUint32 *len);
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/* set or get the data offset for the state, depending on mode */
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extern XPT_PUBLIC_API(void)
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XPT_DataOffset(XPTState *state, PRUint32 *data_offsetp);
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extern XPT_PUBLIC_API(void)
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XPT_SetDataOffset(XPTState *state, PRUint32 data_offset);
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extern XPT_PUBLIC_API(PRUint32)
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XPT_GetOffsetForAddr(XPTCursor *cursor, void *addr);
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extern XPT_PUBLIC_API(PRBool)
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XPT_SetOffsetForAddr(XPTCursor *cursor, void *addr, PRUint32 offset);
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extern XPT_PUBLIC_API(PRBool)
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XPT_SetAddrForOffset(XPTCursor *cursor, PRUint32 offset, void *addr);
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extern XPT_PUBLIC_API(void *)
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XPT_GetAddrForOffset(XPTCursor *cursor, PRUint32 offset);
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/* all data structures are big-endian */
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#if defined IS_BIG_ENDIAN
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# define XPT_SWAB32(x) x
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# define XPT_SWAB16(x) x
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#elif defined IS_LITTLE_ENDIAN
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# define XPT_SWAB32(x) (((x) >> 24) | \
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(((x) >> 8) & 0xff00) | \
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(((x) << 8) & 0xff0000) | \
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((x) << 24))
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# define XPT_SWAB16(x) (((x) >> 8) | ((x) << 8))
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#else
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# error "unknown byte order"
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#endif
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/*
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* If we're decoding, we want to read the offset before we check
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* for already-decoded values.
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*
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* Then we check for repetition: CheckForRepeat will see if we've already
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* encoded/decoded this value, and if so will set offset/addr correctly
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* and make already be true. If not, it will set up the cursor for
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* encoding (reserve space) or decoding (seek to correct location) as
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* appropriate. In the encode case, it will also set the addr->offset
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* mapping.
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*/
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#define XPT_PREAMBLE_(cursor, addrp, pool, size, new_curs, already) \
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XPTMode mode = cursor->state->mode; \
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if (!(mode == XPT_ENCODE || XPT_Do32(cursor, &new_curs.offset)) || \
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!CheckForRepeat(cursor, (void **)addrp, pool, \
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mode == XPT_ENCODE ? size : 0u, &new_curs, \
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&already) || \
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!(mode == XPT_DECODE || XPT_Do32(cursor, &new_curs.offset))) \
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return PR_FALSE; \
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if (already) \
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return PR_TRUE; \
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#define XPT_PREAMBLE_NO_ALLOC(cursor, addrp, pool, size, new_curs, already) \
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{ \
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XPT_PREAMBLE_(cursor, addrp, pool, size, new_curs, already) \
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}
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#define XPT_ERROR_HANDLE(arena, free_it) \
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error: \
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if (cursor->state->mode == XPT_DECODE) \
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XPT_FREEIF(arena, free_it); \
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return PR_FALSE;
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PR_END_EXTERN_C
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#endif /* __xpt_xdr_h__ */
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