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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include <errno.h>
#include <zlib.h>
#define SEPARATOR '\x01'
#define CHUNK_SIZE 16384
#define MAX_FRAMES 1024
#define PATH_SEP '/'
static int is_frame_file(const char *name) {
size_t len = strlen(name);
return len > 4 && strcmp(name + len - 4, ".txt") == 0;
}
static int compare_names(const void *a, const void *b) {
return strcmp(*(const char **)a, *(const char **)b);
}
static char *read_file(const char *path, size_t *out_size) {
FILE *f = fopen(path, "rb");
if (!f) {
fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
return NULL;
}
fseek(f, 0, SEEK_END);
long size = ftell(f);
fseek(f, 0, SEEK_SET);
char *buf = malloc(size);
if (!buf) {
return NULL;
}
if (fread(buf, 1, size, f) != (size_t)size) {
fprintf(stderr, "Failed to read %s\n", path);
return NULL;
}
fclose(f);
*out_size = size;
return buf;
}
int main(int argc, char **argv) {
if (argc != 3) {
fprintf(stderr, "Usage: %s <frames_dir> <output_file>\n", argv[0]);
return 1;
}
const char *frames_dir = argv[1];
const char *output_file = argv[2];
// Use opendir/readdir instead of scandir for Windows compatibility
DIR *dir = opendir(frames_dir);
if (!dir) {
fprintf(stderr, "Failed to scan directory %s: %s\n", frames_dir, strerror(errno));
return 1;
}
char *names[MAX_FRAMES];
int n = 0;
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
if (!is_frame_file(entry->d_name)) continue;
if (n >= MAX_FRAMES) {
fprintf(stderr, "Too many frame files (max %d)\n", MAX_FRAMES);
closedir(dir);
return 1;
}
names[n] = strdup(entry->d_name);
if (!names[n]) {
fprintf(stderr, "Failed to allocate memory\n");
closedir(dir);
return 1;
}
n++;
}
closedir(dir);
if (n == 0) {
fprintf(stderr, "No frame files found in %s\n", frames_dir);
return 1;
}
qsort(names, n, sizeof(char *), compare_names);
size_t total_size = 0;
char **frame_contents = calloc(n, sizeof(char*));
size_t *frame_sizes = calloc(n, sizeof(size_t));
for (int i = 0; i < n; i++) {
char path[4096];
snprintf(path, sizeof(path), "%s%c%s", frames_dir, PATH_SEP, names[i]);
frame_contents[i] = read_file(path, &frame_sizes[i]);
if (!frame_contents[i]) {
return 1;
}
total_size += frame_sizes[i];
if (i < n - 1) total_size++;
}
char *joined = malloc(total_size);
if (!joined) {
fprintf(stderr, "Failed to allocate joined buffer\n");
return 1;
}
size_t offset = 0;
for (int i = 0; i < n; i++) {
memcpy(joined + offset, frame_contents[i], frame_sizes[i]);
offset += frame_sizes[i];
if (i < n - 1) {
joined[offset++] = SEPARATOR;
}
}
uLongf compressed_size = compressBound(total_size);
unsigned char *compressed = malloc(compressed_size);
if (!compressed) {
fprintf(stderr, "Failed to allocate compression buffer\n");
return 1;
}
z_stream stream = {0};
stream.next_in = (unsigned char*)joined;
stream.avail_in = total_size;
stream.next_out = compressed;
stream.avail_out = compressed_size;
// Use -MAX_WBITS for raw DEFLATE (no zlib wrapper)
int ret = deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -MAX_WBITS, 8, Z_DEFAULT_STRATEGY);
if (ret != Z_OK) {
fprintf(stderr, "deflateInit2 failed: %d\n", ret);
return 1;
}
ret = deflate(&stream, Z_FINISH);
if (ret != Z_STREAM_END) {
fprintf(stderr, "deflate failed: %d\n", ret);
deflateEnd(&stream);
return 1;
}
compressed_size = stream.total_out;
deflateEnd(&stream);
FILE *out = fopen(output_file, "wb");
if (!out) {
fprintf(stderr, "Failed to create %s: %s\n", output_file, strerror(errno));
return 1;
}
if (fwrite(compressed, 1, compressed_size, out) != compressed_size) {
fprintf(stderr, "Failed to write compressed data\n");
return 1;
}
fclose(out);
return 0;
}
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