ac-decomp/rel/m_eappli.c

#include "m_eappli.h"

#include "m_common_data.h"
#include "m_private.h"
#include "lb_rtc.h"
#include "m_scene_table.h"
#include "m_malloc.h"
#include "libjsys/jsyswrapper.h"

#define CRC32_POLYNOMIAL 0xEDB88320
#define CRC32_START_VALUE 0xAA478422

static u32 crcTable[256];

static u32 getcrc(u8* data, size_t len) {
  u32 crc = CRC32_START_VALUE;
  size_t i = 0;

  do {
    crc = (crc >> 8) ^ crcTable[(crc ^ data[i]) & 0xFF];
    i++;
  } while (i != len);

  return crc;
}

static void crcgen() {
  int bit;
  u32 c;
  int i;

  for (i = 0; i < 256; i++) {
    int j;
    c = i;
    
    for (j = 0; j < 8; j++) {
      bit = c & 1;
      c >>= 1;
      if (bit) {
        c ^= CRC32_POLYNOMIAL;
      }
    }

    crcTable[i] = c;
  }
}

static u32 mEA_GetCRC(u8* data, size_t len) {
  crcgen();
  return getcrc(data, len);
}

static void putLEWord(u8* dst, u32 word) {
  dst[0] = word >>  0;
  dst[1] = word >>  8;
  dst[2] = word >> 16;
  dst[3] = word >> 24;
}

extern void mEA_InitLetterCardE() {
  mPr_carde_data_c* carde_data = &Common_Get(now_private)->ecard_letter_data;
  lbRTC_time_c* rtc_time = Common_GetPointer(time.rtc_time);

  /* only reset if current date isn't same as last scan date */
  u16 year = carde_data->letter_send_date.year;
  u8 month = carde_data->letter_send_date.month;
  u8 day = carde_data->letter_send_date.day;
  if (rtc_time->year != year || rtc_time->month != month || rtc_time->day != day) {
    int i;
    for (i = 0; i < mPr_ECARD_LETTER_NUM; i++) {
      carde_data->card_letters_sent[i] = 0;
    }
  }
}

extern int mEA_CheckLetterCardE(int card_no) {
  mPr_carde_data_c* card_data = &Common_Get(now_private)->ecard_letter_data;
  int index = card_no < mPr_ECARD_NUM ? card_no : mPr_ECARD_NUM - 1;

  if (index == mPr_ECARD_NUM - 1) {
    return ((card_data->card_letters_sent[index >> 3] >> (index & 7)) & 1) ? 2 : 0;
  }

  return (card_data->card_letters_sent[index >> 3] >> (index & 7)) & 1;
}

extern void mEA_SetLetterCardE(int card_no) {
  mPr_carde_data_c* card_data = &Common_Get(now_private)->ecard_letter_data;
  int index = card_no < mPr_ECARD_NUM ? card_no : mPr_ECARD_NUM - 1;
  lbRTC_time_c* rtc_time = Common_GetPointer(time.rtc_time);

  card_data->card_letters_sent[index >> 3] |= 1 << (index & 7);
  card_data->letter_send_date.year = rtc_time->year;
  card_data->letter_send_date.month = rtc_time->month;
  card_data->letter_send_date.day = rtc_time->day;
}

#define MY_ORIGINAL_DESIGN_DATA_SIZE (4*(32/2)*32)
extern void mEA_GetCardDLProgram() {
  if (Save_Get(scene_no) != SCENE_TITLE_DEMO && Common_Get(carde_program_p) == NULL) {
    u32 crc;
      
    Common_Set(carde_program_size, JW_GetResSizeFileNo(RESOURCE_MY_ORIGINAL) - MY_ORIGINAL_DESIGN_DATA_SIZE); // my_original.bin also contains texture data
    Common_Set(carde_program_p, (u8*)zelda_malloc_align(Common_Get(carde_program_size), 32));
    _JW_GetResourceAram(JW_GetAramAddress(RESOURCE_MY_ORIGINAL) + MY_ORIGINAL_DESIGN_DATA_SIZE, Common_Get(carde_program_p), Common_Get(carde_program_size));
    
    /* write compressed program size to vpk payload */
    putLEWord(
      Common_Get(carde_program_p) + 0x2C,
      Common_Get(carde_program_size) - 0x34
    );

    /* write vpk CRC32 */
    crc = mEA_GetCRC(Common_Get(carde_program_p) + sizeof(u32), Common_Get(carde_program_size) - sizeof(u32));
    putLEWord(
      Common_Get(carde_program_p),
      crc
    );
  }
}

extern void mEA_CleanCardDLProgram() {
  if (Common_Get(carde_program_p) != NULL) {
    zelda_free(Common_Get(carde_program_p));
    Common_Set(carde_program_p, NULL);
    Common_Set(carde_program_size, 0);
  }
}

extern u8* mEA_dl_carde_program_p() {
  return Common_Get(carde_program_p);
}

extern size_t mEA_dl_carde_program_size() {
  return Common_Get(carde_program_size);
}