ref: 6e253b26b2889cfff817b966c95e112bda050298
dir: /src/psaux/psarrst.c/
/**************************************************************************** * * psarrst.c * * Adobe's code for Array Stacks (body). * * Copyright 2007-2013 Adobe Systems Incorporated. * * This software, and all works of authorship, whether in source or * object code form as indicated by the copyright notice(s) included * herein (collectively, the "Work") is made available, and may only be * used, modified, and distributed under the FreeType Project License, * LICENSE.TXT. Additionally, subject to the terms and conditions of the * FreeType Project License, each contributor to the Work hereby grants * to any individual or legal entity exercising permissions granted by * the FreeType Project License and this section (hereafter, "You" or * "Your") a perpetual, worldwide, non-exclusive, no-charge, * royalty-free, irrevocable (except as stated in this section) patent * license to make, have made, use, offer to sell, sell, import, and * otherwise transfer the Work, where such license applies only to those * patent claims licensable by such contributor that are necessarily * infringed by their contribution(s) alone or by combination of their * contribution(s) with the Work to which such contribution(s) was * submitted. If You institute patent litigation against any entity * (including a cross-claim or counterclaim in a lawsuit) alleging that * the Work or a contribution incorporated within the Work constitutes * direct or contributory patent infringement, then any patent licenses * granted to You under this License for that Work shall terminate as of * the date such litigation is filed. * * By using, modifying, or distributing the Work you indicate that you * have read and understood the terms and conditions of the * FreeType Project License as well as those provided in this section, * and you accept them fully. * */ #include "psft.h" #include <freetype/internal/ftdebug.h> #include "psglue.h" #include "psarrst.h" #include "pserror.h" /* * CF2_ArrStack uses an error pointer, to enable shared errors. * Shared errors are necessary when multiple objects allow the program * to continue after detecting errors. Only the first error should be * recorded. */ FT_LOCAL_DEF( void ) cf2_arrstack_init( CF2_ArrStack arrstack, FT_Memory memory, FT_Error* error, size_t sizeItem ) { FT_ASSERT( arrstack ); /* initialize the structure */ arrstack->memory = memory; arrstack->error = error; arrstack->sizeItem = sizeItem; arrstack->allocated = 0; arrstack->count = 0; arrstack->totalSize = 0; arrstack->ptr = NULL; } FT_LOCAL_DEF( void ) cf2_arrstack_finalize( CF2_ArrStack arrstack ) { FT_Memory memory = arrstack->memory; /* for FT_FREE */ FT_ASSERT( arrstack ); arrstack->allocated = 0; arrstack->count = 0; arrstack->totalSize = 0; /* free the data buffer */ FT_FREE( arrstack->ptr ); } /* allocate or reallocate the buffer size; */ /* return false on memory error */ static FT_Bool cf2_arrstack_setNumElements( CF2_ArrStack arrstack, size_t numElements ) { FT_ASSERT( arrstack ); { FT_Error error = FT_Err_Ok; /* for FT_REALLOC */ FT_Memory memory = arrstack->memory; /* for FT_REALLOC */ size_t newSize = numElements * arrstack->sizeItem; if ( numElements > FT_LONG_MAX / arrstack->sizeItem ) goto exit; FT_ASSERT( newSize > 0 ); /* avoid realloc with zero size */ if ( !FT_QREALLOC( arrstack->ptr, arrstack->totalSize, newSize ) ) { arrstack->allocated = numElements; arrstack->totalSize = newSize; if ( arrstack->count > numElements ) { /* we truncated the list! */ CF2_SET_ERROR( arrstack->error, Stack_Overflow ); arrstack->count = numElements; return FALSE; } return TRUE; /* success */ } } exit: /* if there's not already an error, store this one */ CF2_SET_ERROR( arrstack->error, Out_Of_Memory ); return FALSE; } /* set the count, ensuring allocation is sufficient */ FT_LOCAL_DEF( void ) cf2_arrstack_setCount( CF2_ArrStack arrstack, size_t numElements ) { FT_ASSERT( arrstack ); if ( numElements > arrstack->allocated ) { /* expand the allocation first */ if ( !cf2_arrstack_setNumElements( arrstack, numElements ) ) return; } arrstack->count = numElements; } /* clear the count */ FT_LOCAL_DEF( void ) cf2_arrstack_clear( CF2_ArrStack arrstack ) { FT_ASSERT( arrstack ); arrstack->count = 0; } /* current number of items */ FT_LOCAL_DEF( size_t ) cf2_arrstack_size( const CF2_ArrStack arrstack ) { FT_ASSERT( arrstack ); return arrstack->count; } FT_LOCAL_DEF( void* ) cf2_arrstack_getBuffer( const CF2_ArrStack arrstack ) { FT_ASSERT( arrstack ); return arrstack->ptr; } /* return pointer to the given element */ FT_LOCAL_DEF( void* ) cf2_arrstack_getPointer( const CF2_ArrStack arrstack, size_t idx ) { void* newPtr; FT_ASSERT( arrstack ); if ( idx >= arrstack->count ) { /* overflow */ CF2_SET_ERROR( arrstack->error, Stack_Overflow ); idx = 0; /* choose safe default */ } newPtr = (FT_Byte*)arrstack->ptr + idx * arrstack->sizeItem; return newPtr; } /* push (append) an element at the end of the list; */ /* return false on memory error */ /* TODO: should there be a length param for extra checking? */ FT_LOCAL_DEF( void ) cf2_arrstack_push( CF2_ArrStack arrstack, const void* ptr ) { FT_ASSERT( arrstack ); if ( arrstack->count == arrstack->allocated ) { /* increase the buffer size */ if ( !cf2_arrstack_setNumElements( arrstack, arrstack->allocated * 2 + 16 ) ) { /* on error, ignore the push */ return; } } FT_ASSERT( ptr ); { size_t offset = arrstack->count * arrstack->sizeItem; void* newPtr = (FT_Byte*)arrstack->ptr + offset; FT_MEM_COPY( newPtr, ptr, arrstack->sizeItem ); arrstack->count += 1; } } /* END */