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#include "assert.h"
#include "stdio.h"
#include "stdlib.h"
#include "stdint.h"
#include "stdbool.h"
#include "string.h"
#define LOGDBG(...) printf(__VA_ARGS__);
#define BTUINT(b) (b[0] | (b[1] << 8) | (b[2] << 16) | (b[3] << 24))
struct sprite_area_control_block {
uint32_t spriteCount;
uint32_t extensionBytes; /* size of extensionWords byte array */
unsigned char* extensionWords;
};
struct sprite_mode {
uint32_t colorbpp;
uint32_t xdpi;
uint32_t ydpi;
};
struct sprite_header {
char name[13];
struct sprite_mode* mode;
bool hasMask;
uint32_t maskbpp;
bool hasPalette;
uint32_t paletteSize;
uint32_t* palette;
};
uint32_t sprite_read_word(FILE* stream)
{
unsigned char b[4];
size_t bytesRead = fread(b, 1, 4, stream);
if (bytesRead != 4) {
printf("Unexpected EOF\n"); /* TODO, have better error handling, don't exit here */
exit(EXIT_FAILURE);
}
return BTUINT(b);
}
void sprite_read_bytes(FILE* stream, unsigned char* buf, size_t count)
{
size_t bytesRead = fread(buf, 1, count, stream);
if (bytesRead != count) {
printf("Unexpected EOF\n");
exit(EXIT_FAILURE);
}
}
struct sprite_mode* sprite_get_mode(uint32_t spriteMode)
{
static struct sprite_mode oldmodes[256];
for (uint32_t i = 0; i < 256; i++) {
oldmodes[i].colorbpp = 0;
oldmodes[i].xdpi = 0;
oldmodes[i].ydpi = 0;
}
struct sprite_mode* mode = malloc(sizeof(struct sprite_mode));
uint32_t spriteType = spriteMode >> 27; /* preserve bits 27-31 only */
LOGDBG("spriteType %u\n", spriteType);
if (spriteType != 0) {
mode->xdpi = (spriteMode & 0x07ffc000) >> 14; /* preserve bits 14-26 only */
mode->ydpi = (spriteMode & 0x00003ffe) >> 1; /* preserve bits 1-13 only */
switch (spriteType) {
case 1:
mode->colorbpp = 1; break;
case 2:
mode->colorbpp = 2; break;
case 3:
mode->colorbpp = 4; break;
case 4:
mode->colorbpp = 8; break;
case 5:
mode->colorbpp = 16; break;
case 6:
mode->colorbpp = 32; break;
case 7:
mode->colorbpp = 23; break; /* CMYK */
case 8:
mode->colorbpp = 24; break;
}
} else {
memcpy(mode, &(oldmodes[spriteMode]), sizeof(struct sprite_mode));
}
/*LOGDBG("verticalDPI %u\n", verticalDPI);
LOGDBG("horizontalDPI %u\n", horizontalDPI);*/
return mode;
}
int main(int argc, char *argv[])
{
if (argc < 2) {
printf("Usage: libsprite spritefile\n");
exit(EXIT_FAILURE);
}
char* filename = argv[1];
FILE* spritefile = fopen(filename, "rb");
if (spritefile == NULL) {
printf("Can't load spritefile %s\n", filename);
exit(EXIT_FAILURE);
}
LOGDBG("Loading %s\n", filename);
uint32_t spriteCount = sprite_read_word(spritefile);
uint32_t firstSpriteOffset = sprite_read_word(spritefile);
uint32_t firstFreeWordOffset = sprite_read_word(spritefile);
uint32_t extensionByteCount = 16 - firstSpriteOffset;
LOGDBG("spriteCount %u\n", spriteCount);
LOGDBG("firstSpriteOffset %u\n", firstSpriteOffset);
LOGDBG("firstFreeWordOffset %u\n", firstFreeWordOffset);
LOGDBG("extensionByteCount %u\n", extensionByteCount);
unsigned char* extensionWords = NULL;
if (extensionByteCount > 0) {
extensionWords = malloc(extensionByteCount); /* where to free() this? */
sprite_read_bytes(spritefile, extensionWords, extensionByteCount);
}
for (uint32_t i = 0; i < spriteCount; i++) {
uint32_t nextSpriteOffset = sprite_read_word(spritefile);
unsigned char* name = malloc(13); /* last byte for 0 terminator */
sprite_read_bytes(spritefile, name, 12);
name[12] = '\0';
uint32_t width = sprite_read_word(spritefile);
uint32_t height = sprite_read_word(spritefile);
uint32_t firstUsedBit = sprite_read_word(spritefile); /* old format only (spriteType = 0) */
uint32_t lastUsedBit = sprite_read_word(spritefile);
uint32_t imageOffset = sprite_read_word(spritefile);
assert(imageOffset >= 44); /* should never be smaller than the size of the header) */
uint32_t maskOffset = sprite_read_word(spritefile);
uint32_t spriteModeWord= sprite_read_word(spritefile);
struct sprite_mode* spriteMode = sprite_get_mode(spriteModeWord);
uint32_t paletteSize = imageOffset - 44;
bool hasPalette = (paletteSize > 0);
bool hasMask;
uint32_t imageSize;
uint32_t maskSize;
if (imageOffset == maskOffset) {
hasMask = false;
imageSize = nextSpriteOffset - 44 - paletteSize;
maskSize = 0;
} else {
hasMask = true;
imageSize = maskOffset - imageOffset;
maskSize = nextSpriteOffset - 44 - paletteSize - imageSize;
}
LOGDBG("\nLoading sprite %u\n", i);
LOGDBG("nextSpriteOffset %u\n", nextSpriteOffset);
LOGDBG("name %s\n", name);
LOGDBG("width %u\n", width);
LOGDBG("height %u\n", height);
LOGDBG("firstUsedBit %u\n", firstUsedBit);
LOGDBG("lastUsedBit %u\n", lastUsedBit);
LOGDBG("imageOffset %u\n", imageOffset);
LOGDBG("maskOffset %u\n", maskOffset);
LOGDBG("spriteModeWord %u\n", spriteModeWord);
LOGDBG("\tcolorbpp %u\n", spriteMode->colorbpp);
LOGDBG("\txdpi %u\n", spriteMode->xdpi);
LOGDBG("\tydpi %u\n", spriteMode->ydpi);
LOGDBG("hasPalette %s\n", hasPalette ? "YES" : "NO");
LOGDBG("paletteSize %u\n", paletteSize);
LOGDBG("imageSize %u\n", imageSize);
LOGDBG("hasMask %s\n", hasMask ? "YES" : "NO");
LOGDBG("maskSize %u\n", maskSize);
uint32_t* palette = NULL;
if (paletteSize > 0) {
assert(paletteSize % 8 == 0);
palette = malloc(sizeof(uint32_t) * paletteSize);
uint32_t paletteEntries = paletteSize / 8;
/* Each palette entry is two words big
* The section entry is a duplicate of the first
* I think this is in case you ever wanted flashing colours
*/
for (uint32_t j = 0; j < paletteEntries; j++) {
uint32_t word1 = sprite_read_word(spritefile);
uint32_t word2 = sprite_read_word(spritefile);
assert(word1 == word2); /* TODO: if they aren't, START FLASHING */
palette[j] = word1;
}
}
unsigned char* image = malloc(imageSize);
sprite_read_bytes(spritefile, image, imageSize);
unsigned char* mask = malloc(maskSize);
sprite_read_bytes(spritefile, mask, maskSize);
}
return EXIT_SUCCESS;
}
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