103 lines
3.6 KiB
C
103 lines
3.6 KiB
C
/****************************************************************************
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** gmio
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** Copyright Fougue (2 Mar. 2015)
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** contact@fougue.pro
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**
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** This software is a reusable library whose purpose is to provide complete
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** I/O support for various CAD file formats (eg. STL)
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**
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** This software is governed by the CeCILL-B license under French law and
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** abiding by the rules of distribution of free software. You can use,
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** modify and/ or redistribute the software under the terms of the CeCILL-B
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** license as circulated by CEA, CNRS and INRIA at the following URL
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** "http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html".
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****************************************************************************/
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#include "stream_buffer.h"
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#include <string.h>
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static gmio_bool_t gmio_stream_buffer_at_end(void* cookie)
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{
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const gmio_stream_buffer_t* buff = (const gmio_stream_buffer_t*)cookie;
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return buff->pos >= buff->len;
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}
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static int gmio_stream_buffer_error(void* cookie)
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{
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const gmio_stream_buffer_t* buff = (const gmio_stream_buffer_t*)cookie;
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return buff == NULL || buff->pos > buff->len;
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}
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static size_t gmio_stream_buffer_read(
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void* cookie, void* ptr, size_t item_size, size_t item_count)
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{
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if (item_size > 0 && item_count > 0) {
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gmio_stream_buffer_t* buff = (gmio_stream_buffer_t*)cookie;
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const void* buff_ptr =
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buff->readonly_ptr != NULL ?
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buff->readonly_ptr : buff->readwrite_ptr;
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const size_t buff_remaining_size = buff->len - buff->pos;
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const size_t wanted_read_size = item_size * item_count;
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const size_t next_read_size =
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wanted_read_size <= buff_remaining_size ?
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wanted_read_size : buff_remaining_size;
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const size_t next_read_item_count = next_read_size / item_size;
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memcpy(ptr,
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(const char*)buff_ptr + buff->pos,
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next_read_item_count * item_size);
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buff->pos += next_read_item_count * item_size;
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return next_read_item_count;
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}
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else {
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return 0;
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}
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}
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static size_t gmio_stream_buffer_write(
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void* cookie, const void* ptr, size_t item_size, size_t item_count)
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{
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if (item_size > 0 && item_count > 0) {
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gmio_stream_buffer_t* buff = (gmio_stream_buffer_t*)cookie;
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const size_t buff_remaining_size = buff->len - buff->pos;
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const size_t wanted_write_size = item_size * item_count;
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const size_t next_write_size =
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wanted_write_size <= buff_remaining_size ?
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wanted_write_size : buff_remaining_size;
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const size_t next_write_item_count = next_write_size / item_size;
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memcpy((char*)buff->readwrite_ptr + buff->pos,
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ptr,
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next_write_item_count * item_size);
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buff->pos += next_write_item_count * item_size;
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return next_write_item_count;
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}
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else {
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return 0;
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}
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}
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static size_t gmio_stream_buffer_size(void* cookie)
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{
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const gmio_stream_buffer_t* buff = (const gmio_stream_buffer_t*)cookie;
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return buff->len;
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}
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static void gmio_stream_buffer_rewind(void* cookie)
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{
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gmio_stream_buffer_t* buff = (gmio_stream_buffer_t*)cookie;
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buff->pos = 0;
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}
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void gmio_stream_set_buffer(gmio_stream_t *stream, gmio_stream_buffer_t* buff)
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{
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stream->cookie = buff;
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stream->func_at_end = gmio_stream_buffer_at_end;
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stream->func_error = gmio_stream_buffer_error;
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stream->func_read = gmio_stream_buffer_read;
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stream->func_write = gmio_stream_buffer_write;
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stream->func_size = gmio_stream_buffer_size;
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stream->func_rewind = gmio_stream_buffer_rewind;
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}
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