1 /**************************************************************************** 2 * 3 * psarrst.c 4 * 5 * Adobe's code for Array Stacks (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 <freetype/internal/ftdebug.h> 41 42 #include "psglue.h" 43 #include "psarrst.h" 44 45 #include "pserror.h" 46 47 48 /* 49 * CF2_ArrStack uses an error pointer, to enable shared errors. 50 * Shared errors are necessary when multiple objects allow the program 51 * to continue after detecting errors. Only the first error should be 52 * recorded. 53 */ 54 55 FT_LOCAL_DEF( void ) cf2_arrstack_init(CF2_ArrStack arrstack,FT_Memory memory,FT_Error * error,size_t sizeItem)56 cf2_arrstack_init( CF2_ArrStack arrstack, 57 FT_Memory memory, 58 FT_Error* error, 59 size_t sizeItem ) 60 { 61 FT_ASSERT( arrstack ); 62 63 /* initialize the structure */ 64 arrstack->memory = memory; 65 arrstack->error = error; 66 arrstack->sizeItem = sizeItem; 67 arrstack->allocated = 0; 68 arrstack->chunk = 10; /* chunks of 10 items */ 69 arrstack->count = 0; 70 arrstack->totalSize = 0; 71 arrstack->ptr = NULL; 72 } 73 74 75 FT_LOCAL_DEF( void ) cf2_arrstack_finalize(CF2_ArrStack arrstack)76 cf2_arrstack_finalize( CF2_ArrStack arrstack ) 77 { 78 FT_Memory memory = arrstack->memory; /* for FT_FREE */ 79 80 81 FT_ASSERT( arrstack ); 82 83 arrstack->allocated = 0; 84 arrstack->count = 0; 85 arrstack->totalSize = 0; 86 87 /* free the data buffer */ 88 FT_FREE( arrstack->ptr ); 89 } 90 91 92 /* allocate or reallocate the buffer size; */ 93 /* return false on memory error */ 94 static FT_Bool cf2_arrstack_setNumElements(CF2_ArrStack arrstack,size_t numElements)95 cf2_arrstack_setNumElements( CF2_ArrStack arrstack, 96 size_t numElements ) 97 { 98 FT_ASSERT( arrstack ); 99 100 { 101 FT_Error error = FT_Err_Ok; /* for FT_REALLOC */ 102 FT_Memory memory = arrstack->memory; /* for FT_REALLOC */ 103 104 size_t newSize = numElements * arrstack->sizeItem; 105 106 107 if ( numElements > FT_LONG_MAX / arrstack->sizeItem ) 108 goto exit; 109 110 111 FT_ASSERT( newSize > 0 ); /* avoid realloc with zero size */ 112 113 if ( !FT_REALLOC( arrstack->ptr, arrstack->totalSize, newSize ) ) 114 { 115 arrstack->allocated = numElements; 116 arrstack->totalSize = newSize; 117 118 if ( arrstack->count > numElements ) 119 { 120 /* we truncated the list! */ 121 CF2_SET_ERROR( arrstack->error, Stack_Overflow ); 122 arrstack->count = numElements; 123 return FALSE; 124 } 125 126 return TRUE; /* success */ 127 } 128 } 129 130 exit: 131 /* if there's not already an error, store this one */ 132 CF2_SET_ERROR( arrstack->error, Out_Of_Memory ); 133 134 return FALSE; 135 } 136 137 138 /* set the count, ensuring allocation is sufficient */ 139 FT_LOCAL_DEF( void ) cf2_arrstack_setCount(CF2_ArrStack arrstack,size_t numElements)140 cf2_arrstack_setCount( CF2_ArrStack arrstack, 141 size_t numElements ) 142 { 143 FT_ASSERT( arrstack ); 144 145 if ( numElements > arrstack->allocated ) 146 { 147 /* expand the allocation first */ 148 if ( !cf2_arrstack_setNumElements( arrstack, numElements ) ) 149 return; 150 } 151 152 arrstack->count = numElements; 153 } 154 155 156 /* clear the count */ 157 FT_LOCAL_DEF( void ) cf2_arrstack_clear(CF2_ArrStack arrstack)158 cf2_arrstack_clear( CF2_ArrStack arrstack ) 159 { 160 FT_ASSERT( arrstack ); 161 162 arrstack->count = 0; 163 } 164 165 166 /* current number of items */ 167 FT_LOCAL_DEF( size_t ) cf2_arrstack_size(const CF2_ArrStack arrstack)168 cf2_arrstack_size( const CF2_ArrStack arrstack ) 169 { 170 FT_ASSERT( arrstack ); 171 172 return arrstack->count; 173 } 174 175 176 FT_LOCAL_DEF( void* ) cf2_arrstack_getBuffer(const CF2_ArrStack arrstack)177 cf2_arrstack_getBuffer( const CF2_ArrStack arrstack ) 178 { 179 FT_ASSERT( arrstack ); 180 181 return arrstack->ptr; 182 } 183 184 185 /* return pointer to the given element */ 186 FT_LOCAL_DEF( void* ) cf2_arrstack_getPointer(const CF2_ArrStack arrstack,size_t idx)187 cf2_arrstack_getPointer( const CF2_ArrStack arrstack, 188 size_t idx ) 189 { 190 void* newPtr; 191 192 193 FT_ASSERT( arrstack ); 194 195 if ( idx >= arrstack->count ) 196 { 197 /* overflow */ 198 CF2_SET_ERROR( arrstack->error, Stack_Overflow ); 199 idx = 0; /* choose safe default */ 200 } 201 202 newPtr = (FT_Byte*)arrstack->ptr + idx * arrstack->sizeItem; 203 204 return newPtr; 205 } 206 207 208 /* push (append) an element at the end of the list; */ 209 /* return false on memory error */ 210 /* TODO: should there be a length param for extra checking? */ 211 FT_LOCAL_DEF( void ) cf2_arrstack_push(CF2_ArrStack arrstack,const void * ptr)212 cf2_arrstack_push( CF2_ArrStack arrstack, 213 const void* ptr ) 214 { 215 FT_ASSERT( arrstack ); 216 217 if ( arrstack->count == arrstack->allocated ) 218 { 219 /* grow the buffer by one chunk */ 220 if ( !cf2_arrstack_setNumElements( 221 arrstack, arrstack->allocated + arrstack->chunk ) ) 222 { 223 /* on error, ignore the push */ 224 return; 225 } 226 } 227 228 FT_ASSERT( ptr ); 229 230 { 231 size_t offset = arrstack->count * arrstack->sizeItem; 232 void* newPtr = (FT_Byte*)arrstack->ptr + offset; 233 234 235 FT_MEM_COPY( newPtr, ptr, arrstack->sizeItem ); 236 arrstack->count += 1; 237 } 238 } 239 240 241 /* END */ 242