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When -is-viewer is passed on the command line, create an IS Viewer object that intercepts writes at 0x13FF0000. This is used by Ocarina of Time Master Quest Debug to log debug messages. The messages are encoded in EUC-JP, so we bring in iconv to convert that to UTF-8 so the messages can be printed to modern consoles. Props to jrra (@jkbenaim) and spinout for reverse engineering the interface and documenting it: http://wiki.spinout182.com/w/IS64
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include "common.h"
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#include "is_viewer.h"
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// arbitrarily chosen
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#define IS_BUFFER_SIZE 0x200
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int is_viewer_init(struct is_viewer *is) {
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memset(is, 0, sizeof(*is));
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// TODO support other addresses
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is->base_address = IS_VIEWER_BASE_ADDRESS;
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is->len = IS_VIEWER_ADDRESS_LEN;
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is->buffer = calloc(IS_BUFFER_SIZE, 1);
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is->output_buffer = calloc(IS_BUFFER_SIZE, 1);
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is->output_buffer_conv = calloc(IS_BUFFER_SIZE * 3, 1);
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is->cd = iconv_open("UTF-8", "EUC-JP");
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if (is->buffer == NULL || is->output_buffer == NULL ||
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is->output_buffer_conv == NULL)
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return 0;
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else
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return 1;
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}
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int is_viewer_map(struct is_viewer *is, uint32_t address) {
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return address >= is->base_address && address + 4 <= is->base_address + is->len;
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}
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int read_is_viewer(struct is_viewer *is, uint32_t address, uint32_t *word) {
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uint32_t offset = address - is->base_address;
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assert(offset + 4 <= is->len);
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memcpy(word, is->buffer + offset, sizeof(*word));
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*word = byteswap_32(*word);
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return 0;
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}
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int write_is_viewer(struct is_viewer *is, uint32_t address, uint32_t word, uint32_t dqm) {
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uint32_t offset = address - is->base_address;
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assert(offset + 4 <= is->len);
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if (offset == 0x14) {
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if (word > 0) {
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assert(is->output_buffer_pos + word < is->len);
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memcpy(is->output_buffer + is->output_buffer_pos, is->buffer + 0x20, word);
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is->output_buffer_pos += word;
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is->output_buffer[is->output_buffer_pos] = '\0';
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// once a full line is present, convert the output from EUC to UTF-8
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if (memchr(is->output_buffer, '\n', is->output_buffer_pos)) {
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char *inptr = (char *)is->output_buffer;
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size_t len = strlen(inptr);
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size_t outlen = 3 * len;
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char *outptr = (char *)is->output_buffer_conv;
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memset(is->output_buffer_conv, 0, IS_BUFFER_SIZE * 3);
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iconv(is->cd, &inptr, &len, &outptr, &outlen);
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printf("%s", is->output_buffer_conv);
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memset(is->output_buffer, 0, is->output_buffer_pos);
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is->output_buffer_pos = 0;
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}
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}
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memset(is->buffer + 0x20, 0, word);
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} else {
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word = byteswap_32(word);
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memcpy(is->buffer + offset, &word, sizeof(word));
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}
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return 0;
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}
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