1 files changed, 80 insertions, 0 deletions
diff --git a/src/zip.h b/src/zip.h
new file mode 100644
index 0000000..d8b3e02
--- /dev/null
+++ b/src/zip.h
@@ -0,0 +1,80 @@
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define ZIP_FOOTER_MAGIC  0x06054b50 // "PK\5\6"
+#define ZIP_CENTRAL_MAGIC 0x02014b50 // "PK\1\2"
+#define ZIP_HEADER_MAGIC  0x04034b50 // "PK\3\4"
+
+struct zip_file *zip_index(char *const restrict file, size_t const size, int *const restrict /* _Nullable */ error);
+char const *const zip_error(int const code); // error messages do NOT have any newlines
+
+struct zip_index {
+	struct zip_central *central;
+	struct zip_header *header;
+	void *data;
+	uint8_t *filename;
+	size_t filename_length;
+	uint16_t flags;
+	uint16_t method;
+	uint32_t crc32;
+	uint32_t compressed_size;
+	uint32_t original_size;
+};
+
+struct zip_file {
+	size_t file_count;
+	struct zip_index files[];
+};
+
+struct dos_date {
+	uint16_t second: 5, minute: 6, hour: 5;
+	uint16_t day:    5, month:  4, year: 7;
+};
+
+struct __attribute__((__packed__)) zip_footer {
+	uint32_t magic;
+	uint16_t disk_no;
+	uint16_t central_disk_no;
+	uint16_t headers_no;
+	uint16_t headers_no_total;
+	uint32_t headers_size;
+	uint32_t headers_addr;
+	uint16_t comment_length;
+	uint8_t comment[];
+};
+
+struct __attribute__((__packed__)) zip_central {
+	uint32_t magic;
+	uint16_t ver_used;
+	uint16_t ver_needed;
+	uint16_t flags;
+	uint16_t method;
+	struct dos_date mtime;
+	uint32_t checksum;
+	uint32_t compressed_size;
+	uint32_t original_size;
+	uint16_t filename_length;
+	uint16_t extra_length;
+	uint16_t comment_length;
+	uint16_t file_disk_no;
+	uint16_t internal_attr;
+	uint32_t external_attr;
+	uint32_t file_addr;
+	uint8_t filename[];
+};
+
+struct __attribute__((__packed__)) zip_header {
+	uint32_t magic;
+	uint16_t ver_needed;
+	uint16_t flags;
+	uint16_t method;
+	struct dos_date mtime;
+	uint32_t checksum;
+	uint32_t compressed_size;
+	uint32_t original_size;
+	uint16_t filename_length;
+	uint16_t extra_length;
+	uint8_t filename[];
+};