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shell32: Add desktop entries parsing code.

oldstable
Mikołaj Zalewski 2006-08-17 18:28:51 +02:00 committed by Alexandre Julliard
parent 961881836e
commit 589aeba979
2 changed files with 342 additions and 0 deletions
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336
dlls/shell32/xdg.c
View File

@ -290,6 +290,58 @@ static int dskentry_encode(const char *value, char *output)
return num_written;
}
/******************************************************************************
* dskentry_decode [internal]
*
* Unescape the characters that can be escaped according to the desktop entry spec.
* The output parameter may be NULL. Then only the number of characters will
* be computers.
*
* RETURNS
* The number of characters after unescaping the special characters, including the
* terminating NUL.
*/
static int dskentry_decode(const char *value, int len, char *output)
{
int pos = 0;
int count = 0;
while (pos<len)
{
char c;
if (value[pos] == '\\' && pos<len-1)
{
pos++;
switch (value[pos])
{
case 's': c = ' '; break;
case 'n': c = '\n'; break;
case 't': c = '\t'; break;
case 'r': c = 'r'; break;
case '\\': c = '\\'; break;
default:
/* store both the backslash and the character */
if (output)
*(output++) = '\\';
count++;
c = value[pos];
break;
}
}
else
c = value[pos];
if (output)
*(output++) = c;
count++;
pos++;
}
if (output)
*(output++) = 0;
count++;
return count;
}
/******************************************************************************
* url_encode [internal]
@ -338,6 +390,54 @@ static int url_encode(const char *value, char *output)
return num_written;
}
static int decode_url_code(const char *c)
{
const char *p1, *p2;
int v1, v2;
static const char *hexchars = "0123456789ABCDEF";
if (*c == 0)
return -1;
p1 = strchr(hexchars, toupper(*c));
p2 = strchr(hexchars, toupper(*(c+1)));
if (p1 == NULL || p2 == NULL)
return -1;
v1 = (int)(p1 - hexchars);
v2 = (int)(p2 - hexchars);
return (v1<<4) + v2;
}
/******************************************************************************
* url_decode [internal]
*
* URL-decode the given string (i.e. unescape codes like %20). The decoded string
* will never be longer than the encoded one. The decoding can be done in place - the
* output variable can point to the value buffer.
*
* output should not be NULL
*/
static void url_decode(const char *value, char *output)
{
const char *c = value;
while (*c)
{
if (*c == '%')
{
int v = decode_url_code(c+1);
if (v != -1)
{
*(output++) = v;
c += 3;
continue;
}
}
*(output++) = *c;
c++;
}
*output = 0;
}
static int escape_value(const char *value, DWORD dwFlags, char *output)
{
if (dwFlags & XDG_URLENCODE)
@ -370,3 +470,239 @@ BOOL XDG_WriteDesktopStringEntry(int writer, const char *keyName, DWORD dwFlags,
SHFree(string);
return ret;
}
typedef struct
{
char *str;
int len;
} PARSED_STRING;
typedef struct tagPARSED_ENTRY PARSED_ENTRY;
struct tagPARSED_ENTRY
{
PARSED_STRING name;
PARSED_STRING equals;
PARSED_STRING value;
PARSED_ENTRY *next;
};
typedef struct tagPARSED_GROUP PARSED_GROUP;
struct tagPARSED_GROUP
{
PARSED_STRING name;
PARSED_ENTRY *entries;
PARSED_GROUP *next;
};
struct tagXDG_PARSED_FILE
{
char *contents;
PARSED_ENTRY *head_comments;
PARSED_GROUP *groups;
};
static BOOL parsed_str_eq(PARSED_STRING *str1, const char *str2)
{
if (strncmp(str1->str, str2, str1->len) != 0)
return FALSE;
if (str2[str1->len] != 0)
return FALSE;
return TRUE;
}
static void free_entries_list(PARSED_ENTRY *first)
{
PARSED_ENTRY *next;
while (first)
{
next = first->next;
SHFree(first);
first = next;
}
}
void XDG_FreeParsedFile(XDG_PARSED_FILE *parsed)
{
PARSED_GROUP *group, *next;
if (!parsed)
return;
free_entries_list(parsed->head_comments);
group = parsed->groups;
while (group)
{
next = group->next;
free_entries_list(group->entries);
SHFree(group);
group = next;
}
}
#define LINE_GROUP 1
#define LINE_ENTRY 2
#define LINE_COMMENT 3
static int parse_line(char *content, PARSED_ENTRY *output, int *outType)
{
char *end;
ZeroMemory(output, sizeof(PARSED_ENTRY));
end = strchr(content, '\n');
if (end == NULL)
end = content + strlen(content) - 1;
if (*content == '#')
{
*outType = LINE_COMMENT;
output->equals.str = content;
output->equals.len = end - content;
if (*end != '\n')
output->equals.len++;
}
else if (*content == '[')
{
char *last_char = end;
*outType = LINE_GROUP;
/* the standard says nothing about skipping white spaces but e.g. KDE accepts such files */
while (isspace(*last_char))
last_char--;
if (*last_char != ']')
return -1;
output->name.str = content + 1;
output->name.len = last_char - (content + 1);
}
else
{
/* 'name = value' line */
char *equal, *eq_begin, *eq_end;
*outType = LINE_ENTRY;
equal = strchr(content, '=');
if (equal == NULL || equal > end)
return -1;
for (eq_begin = equal-1; isspace(*eq_begin) && eq_begin >= content; eq_begin--)
;
for (eq_end = equal+1; isspace(*eq_end) && *eq_end != '\n'; eq_end++)
;
output->name.str = content;
output->name.len = eq_begin - content + 1;
output->equals.str = eq_begin + 1;
output->equals.len = eq_end - eq_begin - 1;
output->value.str = eq_end;
output->value.len = end - eq_end;
if (*end != '\n')
output->value.len++;
}
return end - content + 1;
}
XDG_PARSED_FILE *XDG_ParseDesktopFile(int fd)
{
struct stat stats;
XDG_PARSED_FILE *parsed = NULL;
PARSED_ENTRY **curr_entry;
PARSED_GROUP **curr_group;
BOOL is_in_group = FALSE;
int pos = 0;
if (fstat(fd, &stats) == -1) goto failed;
parsed = SHAlloc(sizeof(XDG_PARSED_FILE));
if (parsed == NULL) goto failed;
parsed->groups = NULL;
parsed->head_comments = NULL;
parsed->contents = SHAlloc(stats.st_size+1);
if (parsed->contents == NULL) goto failed;
curr_entry = &parsed->head_comments;
curr_group = &parsed->groups;
if (read(fd, parsed->contents, stats.st_size) == -1) goto failed;
parsed->contents[stats.st_size] = 0;
while (pos < stats.st_size)
{
PARSED_ENTRY statement;
int type, size;
size = parse_line(parsed->contents + pos, &statement, &type);
if (size == -1) goto failed;
if (size == 0)
break;
pos += size;
switch (type)
{
case LINE_GROUP:
{
PARSED_GROUP *group = SHAlloc(sizeof(PARSED_GROUP));
if (group == NULL) goto failed;
is_in_group = TRUE;
group->name = statement.name;
group->entries = NULL;
group->next = NULL;
*curr_group = group;
curr_group = &group->next;
curr_entry = &group->entries;
break;
}
case LINE_ENTRY:
if (!is_in_group) goto failed;
/* fall through */
case LINE_COMMENT:
{
PARSED_ENTRY *new_stat = SHAlloc(sizeof(PARSED_ENTRY));
if (new_stat == NULL) goto failed;
*new_stat = statement;
new_stat->next = NULL;
*curr_entry = new_stat;
curr_entry = &new_stat->next;
break;
}
}
}
return parsed;
failed:
XDG_FreeParsedFile(parsed);
return NULL;
}
char *XDG_GetStringValue(XDG_PARSED_FILE *file, const char *group_name, const char *value_name, DWORD dwFlags)
{
PARSED_GROUP *group;
PARSED_ENTRY *entry;
for (group = file->groups; group; group = group->next)
{
if (!parsed_str_eq(&group->name, group_name))
continue;
for (entry = group->entries; entry; entry = entry->next)
if (entry->name.str != NULL && parsed_str_eq(&entry->name, value_name))
{
int len;
char *ret;
len = dskentry_decode(entry->value.str, entry->value.len, NULL);
ret = SHAlloc(len);
if (ret == NULL) return NULL;
dskentry_decode(entry->value.str, entry->value.len, ret);
if (dwFlags & XDG_URLENCODE)
url_decode(ret, ret);
return ret;
}
}
return NULL;
}

6
dlls/shell32/xdg.h
View File

@ -32,6 +32,12 @@ int XDG_MakeDirs(const char *path);
#define XDG_URLENCODE 0x1
BOOL XDG_WriteDesktopStringEntry(int fd, const char *keyName, DWORD dwFlags, const char *value);
typedef struct tagXDG_PARSED_FILE XDG_PARSED_FILE;
XDG_PARSED_FILE *XDG_ParseDesktopFile(int fd);
char *XDG_GetStringValue(XDG_PARSED_FILE *file, const char *group_name, const char *value_name, DWORD dwFlags);
void XDG_FreeParsedFile(XDG_PARSED_FILE *file);
/* implemented in trash.c */
typedef struct tagTRASH_ELEMENT TRASH_ELEMENT;