omicron
7e9c1bfda2
bytes_t is a local (automatic) allocation array that carries the length and capacity with it.
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
#ifndef INCLUDE_SRC_BYTES_H_
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#define INCLUDE_SRC_BYTES_H_
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#include "error.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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extern error_t *const err_bytes_no_capacity;
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typedef struct bytes {
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size_t len;
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size_t cap;
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uint8_t buffer[];
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} bytes_t;
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#define LOCAL_BYTES_ANONYMOUS(N) \
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&(struct { \
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size_t len; \
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size_t cap; \
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uint8_t buffer[(N)]; \
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}) { \
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0, (N), {} \
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}
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#define LOCAL_BYTES(N) (bytes_t *)LOCAL_BYTES_ANONYMOUS(N);
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static inline error_t *bytes_append_uint8(bytes_t *bytes, uint8_t value) {
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if (bytes->len >= bytes->cap)
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return err_bytes_no_capacity;
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bytes->buffer[bytes->len++] = value;
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return nullptr;
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}
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static inline error_t *bytes_append_array(bytes_t *dst, size_t n,
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uint8_t buffer[static n]) {
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if (dst->len + n >= dst->cap)
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return err_bytes_no_capacity;
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memcpy(dst->buffer + dst->len, buffer, n);
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dst->len += n;
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return nullptr;
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}
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static inline error_t *bytes_append_bytes(bytes_t *dst, bytes_t *src) {
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return bytes_append_array(dst, src->len, src->buffer);
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}
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static inline error_t *bytes_append_uint16(bytes_t *dst, uint16_t value) {
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return bytes_append_array(dst, sizeof(value), (uint8_t *)&value);
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}
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static inline error_t *bytes_append_uint32(bytes_t *dst, uint32_t value) {
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return bytes_append_array(dst, sizeof(value), (uint8_t *)&value);
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}
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static inline error_t *bytes_append_uint64(bytes_t *dst, uint64_t value) {
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return bytes_append_array(dst, sizeof(value), (uint8_t *)&value);
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}
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#endif // INCLUDE_SRC_BYTES_H_
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