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![Eric Pouech](/assets/img/avatar_default.png)
When initializing a jsstr_inline_t with a len < 3, the size passed for the allocation is smaller then the size of the structure (as the later is rounded up to the alignment = 4 bytes). GCC 12.2 complains about this when dereferencing the pointer to the structure as the size passed for allocation is smaller than the size of the structure. The warning is fixed by using flexible array member in jsstr_inline_t. Given the rounding behavior in memory allocation, this should not change the size of allocated blocks. Signed-off-by: Eric Pouech <eric.pouech@gmail.com>
191 lines
5.3 KiB
C
191 lines
5.3 KiB
C
/*
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* Copyright 2012 Jacek Caban for CodeWeavers
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/*
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* jsstr_t is a common header for all string representations. The exact layout of the string
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* representation may be:
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*
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* - inline string - string bytes directly follow string headers.
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* - heap string - a structure containing a pointer to buffer on the heap.
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* - roper string - a product of concatenation of two strings. Instead of copying whole
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* buffers, we may store just references to concatenated strings.
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*
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* String layout may change over life time of the string. Currently possible transformation
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* is when a rope string becomes a heap stream. That happens when we need a real, linear
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* zero-terminated buffer (a flat buffer). At this point the type of the string is changed
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* and the new buffer is stored in the string, so that subsequent operations requiring
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* a flat string won't need to flatten it again.
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*
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* In the future more layouts and transformations may be added.
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*/
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struct _jsstr_t {
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unsigned length_flags;
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unsigned ref;
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};
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#define JSSTR_LENGTH_SHIFT 4
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#define JSSTR_MAX_LENGTH ((1 << (32-JSSTR_LENGTH_SHIFT))-1)
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#define JSSTR_FLAGS_MASK ((1 << JSSTR_LENGTH_SHIFT)-1)
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#define JSSTR_FLAG_LBIT 1
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#define JSSTR_FLAG_FLAT 2
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#define JSSTR_FLAG_TAG_MASK 3
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typedef enum {
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JSSTR_INLINE = JSSTR_FLAG_FLAT,
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JSSTR_HEAP = JSSTR_FLAG_FLAT|JSSTR_FLAG_LBIT,
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JSSTR_ROPE = JSSTR_FLAG_LBIT
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} jsstr_tag_t;
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static inline unsigned jsstr_length(jsstr_t *str)
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{
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return str->length_flags >> JSSTR_LENGTH_SHIFT;
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}
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static inline jsstr_tag_t jsstr_tag(jsstr_t *str)
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{
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return str->length_flags & JSSTR_FLAG_TAG_MASK;
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}
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static inline BOOL jsstr_is_inline(jsstr_t *str)
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{
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return jsstr_tag(str) == JSSTR_INLINE;
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}
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static inline BOOL jsstr_is_heap(jsstr_t *str)
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{
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return jsstr_tag(str) == JSSTR_HEAP;
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}
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static inline BOOL jsstr_is_rope(jsstr_t *str)
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{
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return jsstr_tag(str) == JSSTR_ROPE;
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}
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typedef struct {
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jsstr_t str;
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WCHAR buf[];
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} jsstr_inline_t;
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typedef struct {
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jsstr_t str;
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WCHAR *buf;
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} jsstr_heap_t;
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typedef struct {
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jsstr_t str;
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jsstr_t *left;
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jsstr_t *right;
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unsigned depth;
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} jsstr_rope_t;
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jsstr_t *jsstr_alloc_len(const WCHAR*,unsigned) DECLSPEC_HIDDEN;
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jsstr_t *jsstr_alloc_buf(unsigned,WCHAR**) DECLSPEC_HIDDEN;
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static inline jsstr_t *jsstr_alloc(const WCHAR *str)
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{
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return jsstr_alloc_len(str, lstrlenW(str));
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}
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void jsstr_free(jsstr_t*) DECLSPEC_HIDDEN;
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static inline void jsstr_release(jsstr_t *str)
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{
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if(!--str->ref)
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jsstr_free(str);
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}
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static inline jsstr_t *jsstr_addref(jsstr_t *str)
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{
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str->ref++;
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return str;
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}
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static inline jsstr_inline_t *jsstr_as_inline(jsstr_t *str)
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{
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return CONTAINING_RECORD(str, jsstr_inline_t, str);
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}
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static inline jsstr_heap_t *jsstr_as_heap(jsstr_t *str)
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{
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return CONTAINING_RECORD(str, jsstr_heap_t, str);
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}
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static inline jsstr_rope_t *jsstr_as_rope(jsstr_t *str)
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{
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return CONTAINING_RECORD(str, jsstr_rope_t, str);
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}
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const WCHAR *jsstr_rope_flatten(jsstr_rope_t*) DECLSPEC_HIDDEN;
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static inline const WCHAR *jsstr_flatten(jsstr_t *str)
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{
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return jsstr_is_inline(str) ? jsstr_as_inline(str)->buf
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: jsstr_is_heap(str) ? jsstr_as_heap(str)->buf
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: jsstr_rope_flatten(jsstr_as_rope(str));
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}
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void jsstr_extract(jsstr_t*,unsigned,unsigned,WCHAR*) DECLSPEC_HIDDEN;
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static inline unsigned jsstr_flush(jsstr_t *str, WCHAR *buf)
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{
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unsigned len = jsstr_length(str);
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if(jsstr_is_inline(str)) {
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memcpy(buf, jsstr_as_inline(str)->buf, len*sizeof(WCHAR));
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}else if(jsstr_is_heap(str)) {
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memcpy(buf, jsstr_as_heap(str)->buf, len*sizeof(WCHAR));
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}else {
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jsstr_rope_t *rope = jsstr_as_rope(str);
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jsstr_flush(rope->left, buf);
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jsstr_flush(rope->right, buf+jsstr_length(rope->left));
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}
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return len;
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}
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static inline jsstr_t *jsstr_substr(jsstr_t *str, unsigned off, unsigned len)
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{
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jsstr_t *ret;
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WCHAR *ptr;
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ret = jsstr_alloc_buf(len, &ptr);
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if(ret)
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jsstr_extract(str, off, len, ptr);
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return ret;
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}
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int jsstr_cmp(jsstr_t*,jsstr_t*) DECLSPEC_HIDDEN;
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static inline BOOL jsstr_eq(jsstr_t *left, jsstr_t *right)
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{
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return jsstr_length(left) == jsstr_length(right) && !jsstr_cmp(left, right);
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}
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jsstr_t *jsstr_concat(jsstr_t*,jsstr_t*) DECLSPEC_HIDDEN;
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jsstr_t *jsstr_nan(void) DECLSPEC_HIDDEN;
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jsstr_t *jsstr_empty(void) DECLSPEC_HIDDEN;
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jsstr_t *jsstr_undefined(void) DECLSPEC_HIDDEN;
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jsstr_t *jsstr_null_bstr(void) DECLSPEC_HIDDEN;
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HRESULT jsstr_to_bstr(jsstr_t *str, BSTR *r) DECLSPEC_HIDDEN;
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BOOL init_strings(void) DECLSPEC_HIDDEN;
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void free_strings(void) DECLSPEC_HIDDEN;
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const char *debugstr_jsstr(jsstr_t*) DECLSPEC_HIDDEN;
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