/***************************************************************************/ | |
/* */ | |
/* cf2read.c */ | |
/* */ | |
/* Adobe's code for stream handling (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 "cf2ft.h" | |
#include FT_INTERNAL_DEBUG_H | |
#include "cf2glue.h" | |
#include "cf2error.h" | |
/* Define CF2_IO_FAIL as 1 to enable random errors and random */ | |
/* value errors in I/O. */ | |
#define CF2_IO_FAIL 0 | |
#if CF2_IO_FAIL | |
/* set the .00 value to a nonzero probability */ | |
static int | |
randomError2( void ) | |
{ | |
/* for region buffer ReadByte (interp) function */ | |
return (double)rand() / RAND_MAX < .00; | |
} | |
/* set the .00 value to a nonzero probability */ | |
static CF2_Int | |
randomValue() | |
{ | |
return (double)rand() / RAND_MAX < .00 ? rand() : 0; | |
} | |
#endif /* CF2_IO_FAIL */ | |
/* Region Buffer */ | |
/* */ | |
/* Can be constructed from a copied buffer managed by */ | |
/* `FCM_getDatablock'. */ | |
/* Reads bytes with check for end of buffer. */ | |
/* reading past the end of the buffer sets error and returns zero */ | |
FT_LOCAL_DEF( CF2_Int ) | |
cf2_buf_readByte( CF2_Buffer buf ) | |
{ | |
if ( buf->ptr < buf->end ) | |
{ | |
#if CF2_IO_FAIL | |
if ( randomError2() ) | |
{ | |
CF2_SET_ERROR( buf->error, Invalid_Stream_Operation ); | |
return 0; | |
} | |
return *(buf->ptr)++ + randomValue(); | |
#else | |
return *(buf->ptr)++; | |
#endif | |
} | |
else | |
{ | |
CF2_SET_ERROR( buf->error, Invalid_Stream_Operation ); | |
return 0; | |
} | |
} | |
/* note: end condition can occur without error */ | |
FT_LOCAL_DEF( FT_Bool ) | |
cf2_buf_isEnd( CF2_Buffer buf ) | |
{ | |
return (FT_Bool)( buf->ptr >= buf->end ); | |
} | |
/* END */ |