ref: a69320a9b27ed87f87d2d28fffa04907c4752873
dir: /src/psaux/psread.c/
/****************************************************************************
*
* psread.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 "psft.h"
#include <freetype/internal/ftdebug.h>
#include "psglue.h"
#include "pserror.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 */