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< h1 > memstreams.c< / h1 > < / div >
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< a href = "memstreams_8c.html" > Go to the documentation of this file.< / a > < div class = "fragment" > < pre class = "fragment" > < a name = "l00001" > < / a > 00001 < span class = "comment" > /*< / span >
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< a name = "l00002" > < / a > 00002 < span class = "comment" > ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.< / span >
< a name = "l00003" > < / a > 00003 < span class = "comment" > < / span >
< a name = "l00004" > < / a > 00004 < span class = "comment" > This file is part of ChibiOS/RT.< / span >
< a name = "l00005" > < / a > 00005 < span class = "comment" > < / span >
< a name = "l00006" > < / a > 00006 < span class = "comment" > ChibiOS/RT is free software; you can redistribute it and/or modify< / span >
< a name = "l00007" > < / a > 00007 < span class = "comment" > it under the terms of the GNU General Public License as published by< / span >
< a name = "l00008" > < / a > 00008 < span class = "comment" > the Free Software Foundation; either version 3 of the License, or< / span >
< a name = "l00009" > < / a > 00009 < span class = "comment" > (at your option) any later version.< / span >
< a name = "l00010" > < / a > 00010 < span class = "comment" > < / span >
< a name = "l00011" > < / a > 00011 < span class = "comment" > ChibiOS/RT is distributed in the hope that it will be useful,< / span >
< a name = "l00012" > < / a > 00012 < span class = "comment" > but WITHOUT ANY WARRANTY; without even the implied warranty of< / span >
< a name = "l00013" > < / a > 00013 < span class = "comment" > MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the< / span >
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< a name = "l00015" > < / a > 00015 < span class = "comment" > < / span >
< a name = "l00016" > < / a > 00016 < span class = "comment" > You should have received a copy of the GNU General Public License< / span >
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< a name = "l00018" > < / a > 00018 < span class = "comment" > < / span >
< a name = "l00019" > < / a > 00019 < span class = "comment" > ---< / span >
< a name = "l00020" > < / a > 00020 < span class = "comment" > < / span >
< a name = "l00021" > < / a > 00021 < span class = "comment" > A special exception to the GPL can be applied should you wish to distribute< / span >
< a name = "l00022" > < / a > 00022 < span class = "comment" > a combined work that includes ChibiOS/RT, without being obliged to provide< / span >
< a name = "l00023" > < / a > 00023 < span class = "comment" > the source code for any proprietary components. See the file exception.txt< / span >
< a name = "l00024" > < / a > 00024 < span class = "comment" > for full details of how and when the exception can be applied.< / span >
< a name = "l00025" > < / a > 00025 < span class = "comment" > */< / span >
< a name = "l00026" > < / a > 00026 < span class = "comment" > < / span >
< a name = "l00027" > < / a > 00027 < span class = "comment" > /**< / span >
< a name = "l00028" > < / a > 00028 < span class = "comment" > * @file memstreams.c< / span >
< a name = "l00029" > < / a > 00029 < span class = "comment" > * @brief Memory streams code.< / span >
< a name = "l00030" > < / a > 00030 < span class = "comment" > *< / span >
< a name = "l00031" > < / a > 00031 < span class = "comment" > * @addtogroup memory_streams< / span >
< a name = "l00032" > < / a > 00032 < span class = "comment" > * @{< / span >
< a name = "l00033" > < / a > 00033 < span class = "comment" > */< / span >
< a name = "l00034" > < / a > 00034
< a name = "l00035" > < / a > 00035 < span class = "preprocessor" > #include < string.h> < / span >
< a name = "l00036" > < / a > 00036
< a name = "l00037" > < / a > 00037 < span class = "preprocessor" > #include " < a class = "code" href = "ch_8h.html" title = "ChibiOS/RT main include file." > ch.h< / a > " < / span >
< a name = "l00038" > < / a > 00038 < span class = "preprocessor" > #include " < a class = "code" href = "memstreams_8h.html" title = "Memory streams structures and macros." > memstreams.h< / a > " < / span >
< a name = "l00039" > < / a > 00039
< a name = "l00040" > < / a > 00040 < span class = "comment" > /*< / span >
< a name = "l00041" > < / a > 00041 < span class = "comment" > * @brief Write virtual method implementation.< / span >
< a name = "l00042" > < / a > 00042 < span class = "comment" > *< / span >
< a name = "l00043" > < / a > 00043 < span class = "comment" > * @param[in] ip pointer to a @p MemoryStream object< / span >
< a name = "l00044" > < / a > 00044 < span class = "comment" > * @param[in] bp pointer to the data buffer< / span >
< a name = "l00045" > < / a > 00045 < span class = "comment" > * @param[in] n the maximum amount of data to be transferred< / span >
< a name = "l00046" > < / a > 00046 < span class = "comment" > * @return The number of bytes transferred. The return value can< / span >
< a name = "l00047" > < / a > 00047 < span class = "comment" > * be less than the specified number of bytes if the< / span >
< a name = "l00048" > < / a > 00048 < span class = "comment" > * stream reaches a physical end of file and cannot be< / span >
< a name = "l00049" > < / a > 00049 < span class = "comment" > * extended.< / span >
< a name = "l00050" > < / a > 00050 < span class = "comment" > */< / span >
< a name = "l00051" > < / a > 00051 < span class = "keyword" > static< / span > < span class = "keywordtype" > size_t< / span > writes(< span class = "keywordtype" > void< / span > *ip, < span class = "keyword" > const< / span > < a class = "code" href = "group___s_t_m8___c_o_r_e.html#gaba7bc1797add20fe3efdf37ced1182c5" > uint8_t< / a > *bp, < span class = "keywordtype" > size_t< / span > n) {
< a name = "l00052" > < / a > 00052 < a class = "code" href = "struct_memory_stream.html" title = "Memory stream object." > MemoryStream< / a > *msp = ip;
< a name = "l00053" > < / a > 00053
< a name = "l00054" > < / a > 00054 < span class = "keywordflow" > if< / span > (msp-> size - msp-> eos < n)
< a name = "l00055" > < / a > 00055 n = msp-> size - msp-> eos;
< a name = "l00056" > < / a > 00056 memcpy(msp-> buffer + msp-> eos, bp, n);
< a name = "l00057" > < / a > 00057 msp-> eos += n;
< a name = "l00058" > < / a > 00058 < span class = "keywordflow" > return< / span > n;
< a name = "l00059" > < / a > 00059 }
< a name = "l00060" > < / a > 00060
< a name = "l00061" > < / a > 00061 < span class = "comment" > /*< / span >
< a name = "l00062" > < / a > 00062 < span class = "comment" > * @brief Read virtual method implementation.< / span >
< a name = "l00063" > < / a > 00063 < span class = "comment" > *< / span >
< a name = "l00064" > < / a > 00064 < span class = "comment" > * @param[in] ip pointer to a @p MemoryStream object< / span >
< a name = "l00065" > < / a > 00065 < span class = "comment" > * @param[out] bp pointer to the data buffer< / span >
< a name = "l00066" > < / a > 00066 < span class = "comment" > * @param[in] n the maximum amount of data to be transferred< / span >
< a name = "l00067" > < / a > 00067 < span class = "comment" > * @return The number of bytes transferred. The return value can< / span >
< a name = "l00068" > < / a > 00068 < span class = "comment" > * be less than the specified number of bytes if the< / span >
< a name = "l00069" > < / a > 00069 < span class = "comment" > * stream reaches the end of the available data.< / span >
< a name = "l00070" > < / a > 00070 < span class = "comment" > */< / span >
< a name = "l00071" > < / a > 00071 < span class = "keyword" > static< / span > < span class = "keywordtype" > size_t< / span > reads(< span class = "keywordtype" > void< / span > *ip, < a class = "code" href = "group___s_t_m8___c_o_r_e.html#gaba7bc1797add20fe3efdf37ced1182c5" > uint8_t< / a > *bp, < span class = "keywordtype" > size_t< / span > n) {
< a name = "l00072" > < / a > 00072 < a class = "code" href = "struct_memory_stream.html" title = "Memory stream object." > MemoryStream< / a > *msp = ip;
< a name = "l00073" > < / a > 00073
< a name = "l00074" > < / a > 00074 < span class = "keywordflow" > if< / span > (msp-> eos - msp-> offset < n)
< a name = "l00075" > < / a > 00075 n = msp-> eos - msp-> offset;
< a name = "l00076" > < / a > 00076 memcpy(bp, msp-> buffer + msp-> offset, n);
< a name = "l00077" > < / a > 00077 msp-> offset += n;
< a name = "l00078" > < / a > 00078 < span class = "keywordflow" > return< / span > n;
< a name = "l00079" > < / a > 00079 }
< a name = "l00080" > < / a > 00080
< a name = "l00081" > < / a > 00081 < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > < span class = "keyword" > struct < / span > < a class = "code" href = "struct_mem_stream_v_m_t.html" title = "MemStream virtual methods table." > MemStreamVMT< / a > vmt = {writes, reads};
< a name = "l00082" > < / a > 00082 < span class = "comment" > < / span >
< a name = "l00083" > < / a > 00083 < span class = "comment" > /**< / span >
< a name = "l00084" > < / a > 00084 < span class = "comment" > * @brief Memory stream object initialization.< / span >
< a name = "l00085" > < / a > 00085 < span class = "comment" > *< / span >
< a name = "l00086" > < / a > 00086 < span class = "comment" > * @param[out] msp pointer to the @p MemoryStream object to be initialized< / span >
< a name = "l00087" > < / a > 00087 < span class = "comment" > * @param[in] buffer pointer to the memory buffer for the memory stream< / span >
< a name = "l00088" > < / a > 00088 < span class = "comment" > * @param[in] size total size of the memory stream buffer< / span >
< a name = "l00089" > < / a > 00089 < span class = "comment" > * @param[in] eos initial End Of Stream offset. Normally you need to< / span >
< a name = "l00090" > < / a > 00090 < span class = "comment" > * put this to zero for RAM buffers or equal to @p size< / span >
< a name = "l00091" > < / a > 00091 < span class = "comment" > * for ROM streams.< / span >
< a name = "l00092" > < / a > 00092 < span class = "comment" > */< / span >
< a name = "l00093" > < / a > 00093 < span class = "keywordtype" > void< / span > < a class = "code" href = "group__memory__streams.html#gac6c4df5591b95b17517fa9a53c3cf120" title = "Memory stream object initialization." > msObjectInit< / a > (< a class = "code" href = "struct_memory_stream.html" title = "Memory stream object." > MemoryStream< / a > *msp, < a class = "code" href = "group___s_t_m8___c_o_r_e.html#gaba7bc1797add20fe3efdf37ced1182c5" > uint8_t< / a > *buffer, < span class = "keywordtype" > size_t< / span > size, < span class = "keywordtype" > size_t< / span > eos) {
< a name = "l00094" > < / a > 00094
< a name = "l00095" > < / a > 00095 msp-> < a class = "code" href = "struct_memory_stream.html#a786e7cd951a98a69ae22fab4b740a77d" title = "Virtual Methods Table." > vmt< / a > = & vmt;
< a name = "l00096" > < / a > 00096 msp-> buffer = buffer;
< a name = "l00097" > < / a > 00097 msp-> size = size;
< a name = "l00098" > < / a > 00098 msp-> eos = eos;
< a name = "l00099" > < / a > 00099 msp-> offset = 0;
< a name = "l00100" > < / a > 00100 }
< a name = "l00101" > < / a > 00101 < span class = "comment" > < / span >
< a name = "l00102" > < / a > 00102 < span class = "comment" > /** @} */< / span >
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