tumbledemerald-legacy/tools/gbagfx/jasc_pal.c
2022-05-19 17:14:13 +00:00

173 lines
4.3 KiB
C

// Copyright (c) 2015 YamaArashi
#include <stdio.h>
#include <string.h>
#include "global.h"
#include "gfx.h"
#include "util.h"
// Read/write Paint Shop Pro palette files.
// Format of a Paint Shop Pro palette file, line by line:
// "JASC-PAL\r\n" (signature)
// "0100\r\n" (version; seems to always be "0100")
// "<NUMBER_OF_COLORS>\r\n" (number of colors in decimal)
//
// <NUMBER_OF_COLORS> times:
// "<RED> <GREEN> <BLUE>\r\n" (color entry)
//
// Each color component is a decimal number from 0 to 255.
// Examples:
// Black - "0 0 0\r\n"
// Blue - "0 0 255\r\n"
// Brown - "150 75 0\r\n"
#define MAX_LINE_LENGTH 11
void ReadJascPaletteLine(FILE *fp, char *line)
{
int c;
int length = 0;
for (;;)
{
c = fgetc(fp);
if (c == '\r')
{
c = fgetc(fp);
if (c != '\n')
FATAL_ERROR("CR line endings aren't supported.\n");
line[length] = 0;
return;
}
if (c == '\n')
FATAL_ERROR("LF line endings aren't supported.\n");
if (c == EOF)
FATAL_ERROR("Unexpected EOF. No CRLF at end of file.\n");
if (c == 0)
FATAL_ERROR("NUL character in file.\n");
if (length == MAX_LINE_LENGTH)
{
line[length] = 0;
FATAL_ERROR("The line \"%s\" is too long.\n", line);
}
line[length++] = c;
}
}
void ReadJascPalette(char *path, struct Palette *palette)
{
char line[MAX_LINE_LENGTH + 1];
FILE *fp = fopen(path, "rb");
if (fp == NULL)
FATAL_ERROR("Failed to open JASC-PAL file \"%s\" for reading.\n", path);
ReadJascPaletteLine(fp, line);
if (strcmp(line, "JASC-PAL") != 0)
FATAL_ERROR("Invalid JASC-PAL signature.\n");
ReadJascPaletteLine(fp, line);
if (strcmp(line, "0100") != 0)
FATAL_ERROR("Unsuported JASC-PAL version.\n");
ReadJascPaletteLine(fp, line);
if (!ParseNumber(line, NULL, 10, &palette->numColors))
FATAL_ERROR("Failed to parse number of colors.\n");
if (palette->numColors < 1 || palette->numColors > 256)
FATAL_ERROR("%d is an invalid number of colors. The number of colors must be in the range [1, 256].\n", palette->numColors);
for (int i = 0; i < palette->numColors; i++)
{
ReadJascPaletteLine(fp, line);
char *s = line;
char *end;
int red;
int green;
int blue;
if (!ParseNumber(s, &end, 10, &red))
FATAL_ERROR("Failed to parse red color component.\n");
s = end;
if (*s != ' ')
FATAL_ERROR("Expected a space after red color component.\n");
s++;
if (*s < '0' || *s > '9')
FATAL_ERROR("Expected only a space between red and green color components.\n");
if (!ParseNumber(s, &end, 10, &green))
FATAL_ERROR("Failed to parse green color component.\n");
s = end;
if (*s != ' ')
FATAL_ERROR("Expected a space after green color component.\n");
s++;
if (*s < '0' || *s > '9')
FATAL_ERROR("Expected only a space between green and blue color components.\n");
if (!ParseNumber(s, &end, 10, &blue))
FATAL_ERROR("Failed to parse blue color component.\n");
if (*end != 0)
FATAL_ERROR("Garbage after blue color component.\n");
if (red < 0 || red > 255)
FATAL_ERROR("Red color component (%d) is outside the range [0, 255].\n", red);
if (green < 0 || green > 255)
FATAL_ERROR("Green color component (%d) is outside the range [0, 255].\n", green);
if (blue < 0 || blue > 255)
FATAL_ERROR("Blue color component (%d) is outside the range [0, 255].\n", blue);
palette->colors[i].red = red;
palette->colors[i].green = green;
palette->colors[i].blue = blue;
}
if (fgetc(fp) != EOF)
FATAL_ERROR("Garbage after color data.\n");
fclose(fp);
}
void WriteJascPalette(char *path, struct Palette *palette)
{
FILE *fp = fopen(path, "wb");
fputs("JASC-PAL\r\n", fp);
fputs("0100\r\n", fp);
fprintf(fp, "%d\r\n", palette->numColors);
for (int i = 0; i < palette->numColors; i++)
{
struct Color *color = &palette->colors[i];
fprintf(fp, "%d %d %d\r\n", color->red, color->green, color->blue);
}
fclose(fp);
}