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47 lines
2.1 KiB
C
47 lines
2.1 KiB
C
#ifdef INTELLISENSE_DIRECTIVES
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# pragma once
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# include "base_types.h"
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#endif
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////////////////////////////////
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//~ rjf: Non-Fancy Ring Buffer Reads/Writes
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MD_U64 md_ring_write(MD_U8* md_ring_base, MD_U64 md_ring_size, MD_U64 md_ring_pos, void* src_data, MD_U64 src_data_size);
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MD_U64 md_ring_read (MD_U8* md_ring_base, MD_U64 md_ring_size, MD_U64 md_ring_pos, void* dst_data, MD_U64 read_size);
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#define md_ring_write_struct(md_ring_base, md_ring_size, md_ring_pos, ptr) md_ring_write((md_ring_base), (md_ring_size), (md_ring_pos), (ptr), sizeof(*(ptr)))
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#define md_ring_read_struct(md_ring_base, md_ring_size, md_ring_pos, ptr) md_ring_read ((md_ring_base), (md_ring_size), (md_ring_pos), (ptr), sizeof(*(ptr)))
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////////////////////////////////
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//~ rjf: Non-Fancy Ring Buffer Reads/Writes
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inline MD_U64
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md_ring_write(MD_U8* md_ring_base, MD_U64 md_ring_size, MD_U64 md_ring_pos, void* src_data, MD_U64 src_data_size) {
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md_assert(src_data_size <= md_ring_size);
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{
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MD_U64 md_ring_off = md_ring_pos % md_ring_size;
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MD_U64 bytes_before_split = md_ring_size - md_ring_off;
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MD_U64 pre_split_bytes = md_min(bytes_before_split, src_data_size);
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MD_U64 pst_split_bytes = src_data_size - pre_split_bytes;
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void* pre_split_data = src_data;
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void* pst_split_data = ((MD_U8*)src_data + pre_split_bytes);
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md_memory_copy(md_ring_base + md_ring_off, pre_split_data, pre_split_bytes);
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md_memory_copy(md_ring_base + 0, pst_split_data, pst_split_bytes);
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}
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return src_data_size;
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}
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inline MD_U64
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md_ring_read(MD_U8* md_ring_base, MD_U64 md_ring_size, MD_U64 md_ring_pos, void* dst_data, MD_U64 read_size) {
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md_assert(read_size <= md_ring_size);
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{
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MD_U64 md_ring_off = md_ring_pos % md_ring_size;
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MD_U64 bytes_before_split = md_ring_size-md_ring_off;
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MD_U64 pre_split_bytes = md_min(bytes_before_split, read_size);
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MD_U64 pst_split_bytes = read_size - pre_split_bytes;
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md_memory_copy(dst_data, md_ring_base+md_ring_off, pre_split_bytes);
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md_memory_copy((MD_U8*)dst_data + pre_split_bytes, md_ring_base + 0, pst_split_bytes);
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}
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return read_size;
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}
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