1 /***************************************************************************/
2 /* */
3 /* psstack.c */
4 /* */
5 /* Adobe's code for emulating a CFF stack (body). */
6 /* */
7 /* Copyright 2007-2013 Adobe Systems Incorporated. */
8 /* */
9 /* This software, and all works of authorship, whether in source or */
10 /* object code form as indicated by the copyright notice(s) included */
11 /* herein (collectively, the "Work") is made available, and may only be */
12 /* used, modified, and distributed under the FreeType Project License, */
13 /* LICENSE.TXT. Additionally, subject to the terms and conditions of the */
14 /* FreeType Project License, each contributor to the Work hereby grants */
15 /* to any individual or legal entity exercising permissions granted by */
16 /* the FreeType Project License and this section (hereafter, "You" or */
17 /* "Your") a perpetual, worldwide, non-exclusive, no-charge, */
18 /* royalty-free, irrevocable (except as stated in this section) patent */
19 /* license to make, have made, use, offer to sell, sell, import, and */
20 /* otherwise transfer the Work, where such license applies only to those */
21 /* patent claims licensable by such contributor that are necessarily */
22 /* infringed by their contribution(s) alone or by combination of their */
23 /* contribution(s) with the Work to which such contribution(s) was */
24 /* submitted. If You institute patent litigation against any entity */
25 /* (including a cross-claim or counterclaim in a lawsuit) alleging that */
26 /* the Work or a contribution incorporated within the Work constitutes */
27 /* direct or contributory patent infringement, then any patent licenses */
28 /* granted to You under this License for that Work shall terminate as of */
29 /* the date such litigation is filed. */
30 /* */
31 /* By using, modifying, or distributing the Work you indicate that you */
32 /* have read and understood the terms and conditions of the */
33 /* FreeType Project License as well as those provided in this section, */
34 /* and you accept them fully. */
35 /* */
36 /***************************************************************************/
37
38
39 #include "psft.h"
40 #include FT_INTERNAL_DEBUG_H
41
42 #include "psglue.h"
43 #include "psfont.h"
44 #include "psstack.h"
45
46 #include "pserror.h"
47
48
49 /* Allocate and initialize an instance of CF2_Stack. */
50 /* Note: This function returns NULL on error (does not set */
51 /* `error'). */
52 FT_LOCAL_DEF( CF2_Stack )
53 cf2_stack_init( FT_Memory memory,
54 FT_Error* e,
55 FT_UInt stackSize )
56 {
241 FT_LOCAL_DEF( void )
242 cf2_stack_roll( CF2_Stack stack,
243 CF2_Int count,
244 CF2_Int shift )
245 {
246 /* we initialize this variable to avoid compiler warnings */
247 CF2_StackNumber last = { { 0 }, CF2_NumberInt };
248
249 CF2_Int start_idx, idx, i;
250
251
252 if ( count < 2 )
253 return; /* nothing to do (values 0 and 1), or undefined value */
254
255 if ( (CF2_UInt)count > cf2_stack_count( stack ) )
256 {
257 CF2_SET_ERROR( stack->error, Stack_Overflow );
258 return;
259 }
260
261 if ( shift < 0 )
262 shift = -( ( -shift ) % count );
263 else
264 shift %= count;
265
266 if ( shift == 0 )
267 return; /* nothing to do */
268
269 /* We use the following algorithm to do the rolling, */
270 /* which needs two temporary variables only. */
271 /* */
272 /* Example: */
273 /* */
274 /* count = 8 */
275 /* shift = 2 */
276 /* */
277 /* stack indices before roll: 7 6 5 4 3 2 1 0 */
278 /* stack indices after roll: 1 0 7 6 5 4 3 2 */
279 /* */
280 /* The value of index 0 gets moved to index 2, while */
|
1 /****************************************************************************
2 *
3 * psstack.c
4 *
5 * Adobe's code for emulating a CFF stack (body).
6 *
7 * Copyright 2007-2013 Adobe Systems Incorporated.
8 *
9 * This software, and all works of authorship, whether in source or
10 * object code form as indicated by the copyright notice(s) included
11 * herein (collectively, the "Work") is made available, and may only be
12 * used, modified, and distributed under the FreeType Project License,
13 * LICENSE.TXT. Additionally, subject to the terms and conditions of the
14 * FreeType Project License, each contributor to the Work hereby grants
15 * to any individual or legal entity exercising permissions granted by
16 * the FreeType Project License and this section (hereafter, "You" or
17 * "Your") a perpetual, worldwide, non-exclusive, no-charge,
18 * royalty-free, irrevocable (except as stated in this section) patent
19 * license to make, have made, use, offer to sell, sell, import, and
20 * otherwise transfer the Work, where such license applies only to those
21 * patent claims licensable by such contributor that are necessarily
22 * infringed by their contribution(s) alone or by combination of their
23 * contribution(s) with the Work to which such contribution(s) was
24 * submitted. If You institute patent litigation against any entity
25 * (including a cross-claim or counterclaim in a lawsuit) alleging that
26 * the Work or a contribution incorporated within the Work constitutes
27 * direct or contributory patent infringement, then any patent licenses
28 * granted to You under this License for that Work shall terminate as of
29 * the date such litigation is filed.
30 *
31 * By using, modifying, or distributing the Work you indicate that you
32 * have read and understood the terms and conditions of the
33 * FreeType Project License as well as those provided in this section,
34 * and you accept them fully.
35 *
36 */
37
38
39 #include "psft.h"
40 #include FT_INTERNAL_DEBUG_H
41
42 #include "psglue.h"
43 #include "psfont.h"
44 #include "psstack.h"
45
46 #include "pserror.h"
47
48
49 /* Allocate and initialize an instance of CF2_Stack. */
50 /* Note: This function returns NULL on error (does not set */
51 /* `error'). */
52 FT_LOCAL_DEF( CF2_Stack )
53 cf2_stack_init( FT_Memory memory,
54 FT_Error* e,
55 FT_UInt stackSize )
56 {
241 FT_LOCAL_DEF( void )
242 cf2_stack_roll( CF2_Stack stack,
243 CF2_Int count,
244 CF2_Int shift )
245 {
246 /* we initialize this variable to avoid compiler warnings */
247 CF2_StackNumber last = { { 0 }, CF2_NumberInt };
248
249 CF2_Int start_idx, idx, i;
250
251
252 if ( count < 2 )
253 return; /* nothing to do (values 0 and 1), or undefined value */
254
255 if ( (CF2_UInt)count > cf2_stack_count( stack ) )
256 {
257 CF2_SET_ERROR( stack->error, Stack_Overflow );
258 return;
259 }
260
261 /* before C99 it is implementation-defined whether */
262 /* the result of `%' is negative if the first operand */
263 /* is negative */
264 if ( shift < 0 )
265 shift = -( ( -shift ) % count );
266 else
267 shift %= count;
268
269 if ( shift == 0 )
270 return; /* nothing to do */
271
272 /* We use the following algorithm to do the rolling, */
273 /* which needs two temporary variables only. */
274 /* */
275 /* Example: */
276 /* */
277 /* count = 8 */
278 /* shift = 2 */
279 /* */
280 /* stack indices before roll: 7 6 5 4 3 2 1 0 */
281 /* stack indices after roll: 1 0 7 6 5 4 3 2 */
282 /* */
283 /* The value of index 0 gets moved to index 2, while */
|