diff options
| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2010-02-19 18:19:00 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2010-02-19 18:19:00 +0000 |
| commit | 5d983fd514b3fcad1f7a27faf74e21789d93e99a (patch) | |
| tree | 173089388b0ebeffa204268af9e023ea2c33ba5f /os/various | |
| parent | aa71eb0989f940cd0c7b70f6a380239d4c07dc74 (diff) | |
| download | ChibiOS-5d983fd514b3fcad1f7a27faf74e21789d93e99a.tar.gz ChibiOS-5d983fd514b3fcad1f7a27faf74e21789d93e99a.tar.bz2 ChibiOS-5d983fd514b3fcad1f7a27faf74e21789d93e99a.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1637 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/various')
| -rw-r--r-- | os/various/memstreams.c | 95 | ||||
| -rw-r--r-- | os/various/memstreams.h | 73 |
2 files changed, 168 insertions, 0 deletions
diff --git a/os/various/memstreams.c b/os/various/memstreams.c new file mode 100644 index 000000000..935847ece --- /dev/null +++ b/os/various/memstreams.c @@ -0,0 +1,95 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file memstreams.c
+ * @brief Memory streams code.
+ *
+ * @addtogroup memory_streams
+ * @{
+ */
+
+#include <string.h>
+
+#include "ch.h"
+#include "memstreams.h"
+
+/*
+ * @brief Write virtual method implementation.
+ *
+ * @param[in] ip pointer to a @p MemoryStream object
+ * @param[in] bp pointer to the data buffer
+ * @param[in] n the maximum amount of data to be transferred
+ * @return The number of bytes transferred. The return value can
+ * be less than the specified number of bytes if the
+ * stream reaches a physical end of file and cannot be
+ * extended.
+ */
+static size_t writes(void *ip, const uint8_t *bp, size_t n) {
+ MemoryStream *msp = ip;
+
+ if (msp->size - msp->eos < n)
+ n = msp->size - msp->eos;
+ memcpy(msp->buffer + msp->eos, bp, n);
+ msp->eos += n;
+ return n;
+}
+
+/*
+ * @brief Read virtual method implementation.
+ *
+ * @param[in] ip pointer to a @p MemoryStream object
+ * @param[out] bp pointer to the data buffer
+ * @param[in] n the maximum amount of data to be transferred
+ * @return The number of bytes transferred. The return value can
+ * be less than the specified number of bytes if the
+ * stream reaches the end of the available data.
+ */
+static size_t reads(void *ip, uint8_t *bp, size_t n) {
+ MemoryStream *msp = ip;
+
+ if (msp->eos - msp->offset < n)
+ n = msp->eos - msp->offset;
+ memcpy(bp, msp->buffer + msp->offset, n);
+ msp->offset += n;
+ return n;
+}
+
+static const struct MemStreamVMT vmt = {writes, reads};
+
+/**
+ * @brief Memory stream object initialization.
+ *
+ * @param[out] msp pointer to the @p MemoryStream object to be initialized
+ * @param[in] buffer pointer to the memory buffer for the memory stream
+ * @param[in] size total size of the memory stream buffer
+ * @param[in] eos initial End Of Stream offset. Normally you need to
+ * put this to zero for RAM buffers or equal to @p size
+ * for ROM streams.
+ */
+void msObjectInit(MemoryStream *msp, uint8_t *buffer, size_t size, size_t eos) {
+
+ msp->vmt = &vmt;
+ msp->buffer = buffer;
+ msp->size = size;
+ msp->eos = eos;
+ msp->offset = 0;
+}
+
+/** @} */
diff --git a/os/various/memstreams.h b/os/various/memstreams.h new file mode 100644 index 000000000..e7c54618b --- /dev/null +++ b/os/various/memstreams.h @@ -0,0 +1,73 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file memstreams.c
+ * @brief Memory streams structures and macros.
+
+ * @addtogroup memory_streams
+ * @{
+ */
+
+#ifndef _MEMSTREAMS_H_
+#define _MEMSTREAMS_H_
+
+/**
+ * @brief @p RamStream specific data.
+ */
+#define _memory_stream_data \
+ _base_sequental_stream_data \
+ /* Pointer to the stream buffer.*/ \
+ uint8_t *buffer; \
+ /* Size of the stream.*/ \
+ size_t size; \
+ /* Current end of stream.*/ \
+ size_t eos; \
+ /* Current read offset.*/ \
+ size_t offset;
+
+/**
+ * @brief @p MemStream virtual methods table.
+ */
+struct MemStreamVMT {
+ _base_sequental_stream_methods
+};
+
+/**
+ * @extends BaseSequentialStream
+ *
+ * @brief Memory stream object.
+ */
+typedef struct {
+ /** @brief Virtual Methods Table.*/
+ const struct MemStreamVMT *vmt;
+ _memory_stream_data
+} MemoryStream;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void msObjectInit(MemoryStream *msp, uint8_t *buffer, size_t size, size_t eos);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _MEMSTREAMS_H_ */
+
+/** @} */
|