Function modSPIRead

xs/platforms/esp/xsHost.c:1497–1548

}

uint8_t modSPIRead(uint32_t offset, uint32_t size, uint8_t *dst)
{
	uint8_t temp[512] __attribute__ ((aligned (4)));
	uint32_t toAlign;

	if (offset & 3) {		// long align offset
		if (SPI_FLASH_RESULT_OK != spi_flash_read(offset & ~3, (uint32_t *)temp, 4))
			return 0;

		toAlign = 4 - (offset & 3);
		c_memcpy(dst, temp + 4 - toAlign, (size < toAlign) ? size : toAlign);

		if (size <= toAlign)
			return 1;

		dst += toAlign;
		offset += toAlign;
		size -= toAlign;
	}

	toAlign = size & ~3;
	if (toAlign) {
		size -= toAlign;
		if (((uintptr_t)dst) & ~3) {	// dst is not long aligned, copy through stack
			while (toAlign) {
				uint32_t use = (toAlign > sizeof(temp)) ? sizeof(temp) : toAlign;

				if (SPI_FLASH_RESULT_OK != spi_flash_read(offset, (uint32_t *)temp, use))
					return 0;
				c_memmove(dst, temp, use);

				toAlign -= use;
				dst += use;
				offset += use;
			}
		}
		else {
			if (SPI_FLASH_RESULT_OK != spi_flash_read(offset, (uint32_t *)dst, toAlign))
				return 0;
			dst += toAlign;
			offset += toAlign;
		}
	}

	if (size) {				// long align tail
		if (SPI_FLASH_RESULT_OK != spi_flash_read(offset, (uint32_t *)temp, 4))
			return 0;
		c_memcpy(dst, temp, size);
	}

	return 1;
}

uint8_t modSPIWrite(uint32_t offset, uint32_t size, const uint8_t *src)
{