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winhelp: Export enum and search B+ tree functions.

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Kirill K. Smirnov 2007-12-13 00:57:45 +03:00 committed by Alexandre Julliard
parent 25e836e83c
commit af21361dbf
2 changed files with 76 additions and 16 deletions
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66
programs/winhelp/hlpfile.c
View file

@ -76,18 +76,6 @@ static struct
HLPFILE_LINK* link;
} attributes;
/*
* Compare function type for HLPFILE_BPTreeSearch function.
*
* PARAMS
* p [I] pointer to testing block (key + data)
* key [I] pointer to key value to look for
* leaf [I] whether this function called for index of leaf page
* next [O] pointer to pointer to next block
*/
typedef int (*HLPFILE_BPTreeCompare)(void *p, const void *key,
int leaf, void **next);
static BOOL HLPFILE_DoReadHlpFile(HLPFILE*, LPCSTR);
static BOOL HLPFILE_ReadFileToBuffer(HFILE);
static BOOL HLPFILE_FindSubFile(LPCSTR name, BYTE**, BYTE**);
@ -106,8 +94,6 @@ static BOOL HLPFILE_Uncompress3(char*, const char*, const BYTE*, const BYTE*);
static void HLPFILE_UncompressRLE(const BYTE* src, const BYTE* end, BYTE** dst, unsigned dstsz);
static BOOL HLPFILE_ReadFont(HLPFILE* hlpfile);
static void* HLPFILE_BPTreeSearch(BYTE*, const void*, HLPFILE_BPTreeCompare);
/***********************************************************************
*
* HLPFILE_PageByNumber
@ -1924,8 +1910,8 @@ static void HLPFILE_UncompressRLE(const BYTE* src, const BYTE* end, BYTE** dst,
* Pointer to block identified by key, or NULL if failure.
*
*/
static void* HLPFILE_BPTreeSearch(BYTE* buf, const void* key,
HLPFILE_BPTreeCompare comp)
void* HLPFILE_BPTreeSearch(BYTE* buf, const void* key,
HLPFILE_BPTreeCompare comp)
{
unsigned magic;
unsigned page_size;
@ -1970,6 +1956,54 @@ static void* HLPFILE_BPTreeSearch(BYTE* buf, const void* key,
return NULL;
}
/**************************************************************************
* HLPFILE_BPTreeEnum
*
* Enumerates elements in B+ tree.
*
* PARAMS
* buf [I] pointer to the embedded file structured as a B+ tree
* cb [I] compare function
* cookie [IO] cookie for cb function
*/
void HLPFILE_BPTreeEnum(BYTE* buf, HLPFILE_BPTreeCallback cb, void* cookie)
{
unsigned magic;
unsigned page_size;
unsigned cur_page;
unsigned level;
BYTE *pages, *ptr, *newptr;
int i, entries;
magic = GET_USHORT(buf, 9);
if (magic != 0x293B)
{
WINE_ERR("Invalid magic in B+ tree: 0x%x\n", magic);
return;
}
page_size = GET_USHORT(buf, 9+4);
cur_page = GET_USHORT(buf, 9+26);
level = GET_USHORT(buf, 9+32);
pages = buf + 9 + 38;
while (--level > 0)
{
ptr = pages + cur_page*page_size;
cur_page = GET_USHORT(ptr, 4);
}
while (cur_page != 0xFFFF)
{
ptr = pages + cur_page*page_size;
entries = GET_SHORT(ptr, 2);
ptr += 8;
for (i = 0; i < entries; i++)
{
cb(ptr, (void **)&newptr, cookie);
ptr = newptr;
}
cur_page = GET_USHORT(pages+cur_page*page_size, 6);
}
}
/***********************************************************************
*

26
programs/winhelp/hlpfile.h
View file

@ -3,6 +3,7 @@
*
* Copyright 1996 Ulrich Schmid
* 2002 Eric Pouech
* 2007 Kirill K. Smirnov
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -150,6 +151,28 @@ typedef struct tagHlpFileFile
HLPFILE_WINDOWINFO* windows;
} HLPFILE;
/*
* Compare function type for HLPFILE_BPTreeSearch function.
*
* PARAMS
* p [I] pointer to testing block (key + data)
* key [I] pointer to key value to look for
* leaf [I] whether this function called for index of leaf page
* next [O] pointer to pointer to next block
*/
typedef int (*HLPFILE_BPTreeCompare)(void *p, const void *key,
int leaf, void **next);
/*
* Callback function type for HLPFILE_BPTreeEnum function.
*
* PARAMS
* p [I] pointer to data block
* next [O] pointer to pointer to next block
* cookie [IO] cookie data
*/
typedef void (*HLPFILE_BPTreeCallback)(void *p, void **next, void *cookie);
HLPFILE* HLPFILE_ReadHlpFile(LPCSTR lpszPath);
HLPFILE_PAGE* HLPFILE_Contents(HLPFILE* hlpfile);
HLPFILE_PAGE* HLPFILE_PageByHash(HLPFILE* hlpfile, LONG lHash);
@ -158,3 +181,6 @@ HLPFILE_PAGE* HLPFILE_PageByOffset(HLPFILE* hlpfile, LONG offset);
LONG HLPFILE_Hash(LPCSTR lpszContext);
void HLPFILE_FreeLink(HLPFILE_LINK* link);
void HLPFILE_FreeHlpFile(HLPFILE*);
void* HLPFILE_BPTreeSearch(BYTE*, const void*, HLPFILE_BPTreeCompare);
void HLPFILE_BPTreeEnum(BYTE*, HLPFILE_BPTreeCallback cb, void *cookie);