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48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
#pragma once
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#include "foundation/types.h"
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/* A simple byte-oriented writer.
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use this instead of manually writing data as this deals with memory alignment issues
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for you.
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memory alignment can be critical and annoying on some architectures (e.g. PowerPC)
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it also handles little-endian/big-endian issues
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Usually you just make one of these things on the stack, passing in your buffer and length
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct bytewriter_struct_t
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{
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size_t byte_length;
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uint8_t *data_ptr;
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void *data;
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} bytewriter_s, *bytewriter_t;
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void bytewriter_init(bytewriter_t byte_writer, void *data, size_t byte_length);
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static size_t bytewriter_size(bytewriter_t byte_writer) /* returns remaining bytes in stream */
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{
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return byte_writer->byte_length;
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}
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static void *bytewriter_pointer(bytewriter_t byte_writer) /* returns a pointer to the current bitstream position */
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{
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return byte_writer->data_ptr;
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}
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static void bytewriter_advance(bytewriter_t byte_writer, size_t bytes) /* advances the byte stream */
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{
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byte_writer->byte_length-=bytes;
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byte_writer->data_ptr+=bytes;
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}
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void bytewriter_write_n(bytewriter_t byte_writer, const void *source, size_t bytes);
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void bytewriter_write_zero_n(bytewriter_t byte_writer, size_t bytes);
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void bytewriter_write_u8(bytewriter_t byte_writer, uint8_t value);
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void bytewriter_write_u16_le(bytewriter_t byte_writer, uint16_t value);
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void bytewriter_write_u16_be(bytewriter_t byte_writer, uint16_t value);
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void bytewriter_write_u32_le(bytewriter_t byte_writer, uint32_t value);
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void bytewriter_write_u32_be(bytewriter_t byte_writer, uint32_t value);
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void bytewriter_write_uuid_be(bytewriter_t byte_writer, GUID guid_value);
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#ifdef __cplusplus
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}
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#endif
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