DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (fddffdeab170)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * Basic APIs for streaming typelib structures to/from disk.
 */

#ifndef __xpt_xdr_h__
#define __xpt_xdr_h__

#include "xpt_struct.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef struct XPTState         XPTState;
typedef struct XPTDatapool      XPTDatapool;
typedef struct XPTCursor        XPTCursor;

/* Opaque type, for internal use */
typedef struct XPTHashTable     XPTHashTable;

extern XPT_PUBLIC_API(PRBool)
XPT_DoString(XPTArena *arena, XPTCursor *cursor, XPTString **strp);

extern XPT_PUBLIC_API(PRBool)
XPT_DoStringInline(XPTArena *arena, XPTCursor *cursor, XPTString **strp);

extern XPT_PUBLIC_API(PRBool)
XPT_DoCString(XPTArena *arena, XPTCursor *cursor, char **strp);

extern XPT_PUBLIC_API(PRBool)
XPT_DoIID(XPTCursor *cursor, nsID *iidp);

extern XPT_PUBLIC_API(PRBool)
XPT_Do64(XPTCursor *cursor, int64_t *u64p);

extern XPT_PUBLIC_API(PRBool)
XPT_Do32(XPTCursor *cursor, uint32_t *u32p);

extern XPT_PUBLIC_API(PRBool)
XPT_Do16(XPTCursor *cursor, uint16_t *u16p);

extern XPT_PUBLIC_API(PRBool)
XPT_Do8(XPTCursor *cursor, uint8_t *u8p);

extern XPT_PUBLIC_API(PRBool)
XPT_DoHeaderPrologue(XPTArena *arena, XPTCursor *cursor, XPTHeader **headerp, uint32_t * ide_offset);
extern XPT_PUBLIC_API(PRBool)
XPT_DoHeader(XPTArena *arena, XPTCursor *cursor, XPTHeader **headerp);

typedef enum {
    XPT_ENCODE,
    XPT_DECODE
} XPTMode;

typedef enum {
    XPT_HEADER = 0,
    XPT_DATA = 1
} XPTPool;

struct XPTState {
    XPTMode          mode;
    uint32_t         data_offset;
    uint32_t         next_cursor[2];
    XPTDatapool      *pool;
    XPTArena         *arena;
};

struct XPTDatapool {
    XPTHashTable     *offset_map;
    char             *data;
    uint32_t         count;
    uint32_t         allocated;
};

struct XPTCursor {
    XPTState    *state;
    XPTPool     pool;
    uint32_t    offset;
    uint8_t     bits;
};

extern XPT_PUBLIC_API(XPTState *)
XPT_NewXDRState(XPTMode mode, char *data, uint32_t len);

extern XPT_PUBLIC_API(PRBool)
XPT_MakeCursor(XPTState *state, XPTPool pool, uint32_t len, XPTCursor *cursor);

extern XPT_PUBLIC_API(PRBool)
XPT_SeekTo(XPTCursor *cursor, uint32_t offset);

extern XPT_PUBLIC_API(void)
XPT_DestroyXDRState(XPTState *state);

/* Set file_length based on the data used in the state.  (Only ENCODE.) */
extern XPT_PUBLIC_API(PRBool)
XPT_UpdateFileLength(XPTState *state);

/* returns the length of the specified data block */
extern XPT_PUBLIC_API(void)
XPT_GetXDRDataLength(XPTState *state, XPTPool pool, uint32_t *len);

extern XPT_PUBLIC_API(void)
XPT_GetXDRData(XPTState *state, XPTPool pool, char **data, uint32_t *len);

/* set or get the data offset for the state, depending on mode */
extern XPT_PUBLIC_API(void)
XPT_DataOffset(XPTState *state, uint32_t *data_offsetp);

extern XPT_PUBLIC_API(void)
XPT_SetDataOffset(XPTState *state, uint32_t data_offset);

extern XPT_PUBLIC_API(uint32_t)
XPT_GetOffsetForAddr(XPTCursor *cursor, void *addr);

extern XPT_PUBLIC_API(PRBool)
XPT_SetOffsetForAddr(XPTCursor *cursor, void *addr, uint32_t offset);

extern XPT_PUBLIC_API(PRBool)
XPT_SetAddrForOffset(XPTCursor *cursor, uint32_t offset, void *addr);

extern XPT_PUBLIC_API(void *)
XPT_GetAddrForOffset(XPTCursor *cursor, uint32_t offset);

/* all data structures are big-endian */

#if defined IS_BIG_ENDIAN
#  define XPT_SWAB32(x) x
#  define XPT_SWAB16(x) x
#elif defined IS_LITTLE_ENDIAN
#  define XPT_SWAB32(x) (((x) >> 24) |                                        \
             (((x) >> 8) & 0xff00) |                                          \
             (((x) << 8) & 0xff0000) |                                        \
             ((x) << 24))
#  define XPT_SWAB16(x) (((x) >> 8) | ((x) << 8))
#else
#  error "unknown byte order"
#endif

/*
 * If we're decoding, we want to read the offset before we check
 * for already-decoded values.
 *
 * Then we check for repetition: CheckForRepeat will see if we've already
 * encoded/decoded this value, and if so will set offset/addr correctly
 * and make already be true.  If not, it will set up the cursor for
 * encoding (reserve space) or decoding (seek to correct location) as
 * appropriate.  In the encode case, it will also set the addr->offset
 * mapping.
 */

#define XPT_PREAMBLE_(cursor, addrp, pool, size, new_curs, already)           \
    XPTMode mode = cursor->state->mode;                                       \
    if (!(mode == XPT_ENCODE || XPT_Do32(cursor, &new_curs.offset)) ||        \
        !CheckForRepeat(cursor, (void **)addrp, pool,                         \
                        mode == XPT_ENCODE ? size : 0u, &new_curs,            \
                        &already) ||                                          \
        !(mode == XPT_DECODE || XPT_Do32(cursor, &new_curs.offset)))          \
        return PR_FALSE;                                                      \
    if (already)                                                              \
        return PR_TRUE;                                                       \

#define XPT_PREAMBLE_NO_ALLOC(cursor, addrp, pool, size, new_curs, already)   \
  {                                                                           \
    XPT_PREAMBLE_(cursor, addrp, pool, size, new_curs, already)               \
  }

#define XPT_ERROR_HANDLE(arena, free_it)                                      \
 error:                                                                       \
    if (cursor->state->mode == XPT_DECODE)                                    \
    XPT_FREEIF(arena, free_it);                                               \
    return PR_FALSE;


#ifdef __cplusplus
}
#endif

#endif /* __xpt_xdr_h__ */