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| 1 /* | |
| 2 * Copyright (C) 2005 David Turner | |
| 3 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies) | |
| 4 * Copyright (C) 2007 Red Hat, Inc. | |
| 5 * | |
| 6 * This is part of HarfBuzz, an OpenType Layout engine library. | |
| 7 * | |
| 8 * Permission is hereby granted, without written agreement and without | |
| 9 * license or royalty fees, to use, copy, modify, and distribute this | |
| 10 * software and its documentation for any purpose, provided that the | |
| 11 * above copyright notice and the following two paragraphs appear in | |
| 12 * all copies of this software. | |
| 13 * | |
| 14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR | |
| 15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES | |
| 16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN | |
| 17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH | |
| 18 * DAMAGE. | |
| 19 * | |
| 20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, | |
| 21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | |
| 23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO | |
| 24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | |
| 25 * | |
| 26 * Red Hat Author(s): Behdad Esfahbod | |
| 27 */ | |
| 28 | |
| 29 #include "harfbuzz-impl.h" | |
| 30 #include "harfbuzz-stream-private.h" | |
| 31 #include <stdlib.h> | |
| 32 | |
| 33 #if 0 | |
| 34 #include <stdio.h> | |
| 35 #define LOG(x) _hb_log x | |
| 36 | |
| 37 static void | |
| 38 _hb_log( const char* format, ... ) | |
| 39 { | |
| 40 va_list ap; | |
| 41 | |
| 42 va_start( ap, format ); | |
| 43 vfprintf( stderr, format, ap ); | |
| 44 va_end( ap ); | |
| 45 } | |
| 46 | |
| 47 #else | |
| 48 #define LOG(x) do {} while (0) | |
| 49 #endif | |
| 50 | |
| 51 HB_INTERNAL void | |
| 52 _hb_close_stream( HB_Stream stream ) | |
| 53 { | |
| 54 if (!stream) | |
| 55 return; | |
| 56 free(stream->base); | |
| 57 free(stream); | |
| 58 } | |
| 59 | |
| 60 | |
| 61 HB_INTERNAL HB_Int | |
| 62 _hb_stream_pos( HB_Stream stream ) | |
| 63 { | |
| 64 LOG(( "_hb_stream_pos() -> %ld\n", stream->pos )); | |
| 65 return stream->pos; | |
| 66 } | |
| 67 | |
| 68 | |
| 69 HB_INTERNAL HB_Error | |
| 70 _hb_stream_seek( HB_Stream stream, | |
| 71 HB_UInt pos ) | |
| 72 { | |
| 73 HB_Error error = (HB_Error)0; | |
| 74 | |
| 75 stream->pos = pos; | |
| 76 if (pos > stream->size) | |
| 77 error = ERR(HB_Err_Read_Error); | |
| 78 | |
| 79 LOG(( "_hb_stream_seek(%ld) -> 0x%04X\n", pos, error )); | |
| 80 return error; | |
| 81 } | |
| 82 | |
| 83 | |
| 84 HB_INTERNAL HB_Error | |
| 85 _hb_stream_frame_enter( HB_Stream stream, | |
| 86 HB_UInt count ) | |
| 87 { | |
| 88 HB_Error error = HB_Err_Ok; | |
| 89 | |
| 90 /* check new position, watch for overflow */ | |
| 91 if (HB_UNLIKELY (stream->pos + count > stream->size || | |
| 92 stream->pos + count < stream->pos)) | |
| 93 { | |
| 94 error = ERR(HB_Err_Read_Error); | |
| 95 goto Exit; | |
| 96 } | |
| 97 | |
| 98 /* set cursor */ | |
| 99 stream->cursor = stream->base + stream->pos; | |
| 100 stream->pos += count; | |
| 101 | |
| 102 Exit: | |
| 103 LOG(( "_hb_stream_frame_enter(%ld) -> 0x%04X\n", count, error )); | |
| 104 return error; | |
| 105 } | |
| 106 | |
| 107 | |
| 108 HB_INTERNAL void | |
| 109 _hb_stream_frame_exit( HB_Stream stream ) | |
| 110 { | |
| 111 stream->cursor = NULL; | |
| 112 | |
| 113 LOG(( "_hb_stream_frame_exit()\n" )); | |
| 114 } | |
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