72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
#include "hyrule_magic.h"
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namespace yaze {
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namespace zelda3 {
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namespace {
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// "load little endian value at the given byte offset and shift to get its
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// value relative to the base offset (powers of 256, essentially)"
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unsigned ldle(uint8_t const *const p_arr, unsigned const p_index) {
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uint32_t v = p_arr[p_index];
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v <<= (8 * p_index);
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return v;
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}
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void stle(uint8_t *const p_arr, size_t const p_index, unsigned const p_val) {
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uint8_t v = (p_val >> (8 * p_index)) & 0xff;
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p_arr[p_index] = v;
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}
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void stle0(uint8_t *const p_arr, unsigned const p_val) {
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stle(p_arr, 0, p_val);
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}
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void stle1(uint8_t *const p_arr, unsigned const p_val) {
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stle(p_arr, 1, p_val);
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}
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void stle2(uint8_t *const p_arr, unsigned const p_val) {
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stle(p_arr, 2, p_val);
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}
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void stle3(uint8_t *const p_arr, unsigned const p_val) {
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stle(p_arr, 3, p_val);
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}
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// Helper function to get the first byte in a little endian number
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uint32_t ldle0(uint8_t const *const p_arr) { return ldle(p_arr, 0); }
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// Helper function to get the second byte in a little endian number
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uint32_t ldle1(uint8_t const *const p_arr) { return ldle(p_arr, 1); }
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// Helper function to get the third byte in a little endian number
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uint32_t ldle2(uint8_t const *const p_arr) { return ldle(p_arr, 2); }
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// Helper function to get the third byte in a little endian number
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uint32_t ldle3(uint8_t const *const p_arr) { return ldle(p_arr, 3); }
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} // namespace
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void stle16b_i(uint8_t *const p_arr, size_t const p_index,
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uint16_t const p_val) {
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stle16b(p_arr + (p_index * 2), p_val);
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}
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void stle16b(uint8_t *const p_arr, uint16_t const p_val) {
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stle0(p_arr, p_val);
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stle1(p_arr, p_val);
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}
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uint16_t ldle16b(uint8_t const *const p_arr) {
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uint16_t v = 0;
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v |= (ldle0(p_arr) | ldle1(p_arr));
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return v;
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}
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uint16_t ldle16b_i(uint8_t const *const p_arr, size_t const p_index) {
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return ldle16b(p_arr + (2 * p_index));
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}
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} // namespace zelda3
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} // namespace yaze
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