1 files changed, 67 insertions, 0 deletions
diff --git a/pack.c b/pack.c
new file mode 100644
index 0000000..3d25688
--- /dev/null
+++ b/pack.c
@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <string.h>
+
+#define buffer_size 256
+
+typedef struct {
+	int size;
+	int offset;
+	char name[56];
+} Entry;
+
+int main(int argc, char** argv) {
+	int i, j, file_count, blob_offset, read, head_size;
+	char buffer[buffer_size];
+	Entry entry;
+	FILE* outfile, * infile;
+
+	outfile = fopen("pack", "wb");
+	if (!outfile) {
+		fprintf(stderr, "Failed to open 'pack' for writing.");
+		return 1;
+	}
+
+	file_count = argc - 1;
+	head_size = 8;
+	blob_offset = head_size + file_count * sizeof entry;
+
+	fwrite(&file_count,  4, 1, outfile);
+	fwrite(&blob_offset, 4, 1, outfile);
+
+	entry.offset = blob_offset;
+
+	for (i = 0; i < file_count; i++) {
+		strcpy(entry.name, argv[i + 1]);
+
+		infile = fopen(entry.name, "rb");
+		if (!infile) {
+			fprintf(
+				stderr,
+				"Failed to open '%s' for reading.",
+				entry.name
+			);
+			return 1;
+		}
+
+		fseek(infile, 0, SEEK_END);
+		entry.size = ftell(infile);
+		rewind(infile);
+
+		printf("Adding %s\n", entry.name);
+
+		fseek(outfile, head_size + i * sizeof entry, SEEK_SET);
+		fwrite(&entry, 1, sizeof entry, outfile);
+
+		fseek(outfile, entry.offset, SEEK_SET);
+		for (j = 0; j < entry.size; j += buffer_size) {
+			read = fread(buffer, 1, buffer_size, infile);
+			fwrite(buffer, 1, read, outfile);
+		}
+
+		entry.offset += entry.size;
+
+		fclose(infile);
+	}
+
+	fclose(outfile);
+}