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v/vlib/szip/szip.v
2020-05-17 13:51:18 +02:00

286 lines
7.6 KiB
V

module szip
#flag -I @VROOT/thirdparty/zip
#include "zip.c"
#include "zip.h"
type zip C.zip_t
type zip_ptr &zip
// Ref - miniz.h
const (
NO_COMPRESSION = 0
BEST_SPEED = 1
BEST_COMPRESSION = 9
UBER_COMPRESSION = 10
DEFAULT_LEVEL = 6
DEFAULT_COMPRESSION = -1
)
// Ref - zip.h
const (
DEFAULT_COMPRESSION_LEVEL = (DEFAULT_LEVEL)
)
const (
M_WRITE = 'w'
M_RONLY = 'r'
M_APPEND = 'a'
)
/**
* open opens zip archive with compression level using the given mode.
*
* @param zipname zip archive file name.
* @param level compression level (0-9 are the standard zlib-style levels).
* @param mode file access mode.
* - 'r': opens a file for reading/extracting (the file must exists).
* - 'w': creates an empty file for writing.
* - 'a': appends to an existing archive.
*
* @return the zip archive handler or NULL on error
*/
pub fn open(name string, level int, mode string) ?zip_ptr {
mut _nlevel := level
if (_nlevel & 0xF) > UBER_COMPRESSION {
_nlevel = DEFAULT_COMPRESSION_LEVEL
}
n := name.len
if n == 0 {
return error('szip: name of file empty')
}
if mode != M_WRITE && mode != M_RONLY && mode != M_APPEND {
return error('szip: invalid provided open mode')
}
/* struct zip_t* */_p_zip := zip_ptr(C.zip_open(name.str,
_nlevel, mode.str))
if _p_zip == zip_ptr(0) {
return error('szip: cannot open/create/append new zip archive')
}
return _p_zip
}
/**
* close closes the zip archive, releases resources - always finalize.
*
* @param zip zip archive handler.
*/
pub fn (mut z zip_ptr) close() {
C.zip_close(z)
}
/**
* open_entry opens an entry by name in the zip archive.
*
* For zip archive opened in 'w' or 'a' mode the function will append
* a new entry. In readonly mode the function tries to locate the entry
* in global dictionary.
*
* @param zip zip archive handler.
* @param entryname an entry name in local dictionary.
*
* @return the return code - 0 on success, negative number (< 0) on error.
*/
pub fn (mut zentry zip_ptr) open_entry(name string) /*?*/bool {
res := C.zip_entry_open(zentry, name.str)
return res != -1
}
/**
* close_entry closes a zip entry, flushes buffer and releases resources.
*
* @param zip zip archive handler.
*
* @return the return code - 0 on success, negative number (< 0) on error.
*/
pub fn (mut zentry zip_ptr) close_entry() {
C.zip_entry_close(zentry)
}
/**
* name returns a local name of the current zip entry.
*
* The main difference between user's entry name and local entry name
* is optional relative path.
* Following .ZIP File Format Specification - the path stored MUST not contain
* a drive or device letter, or a leading slash.
* All slashes MUST be forward slashes '/' as opposed to backwards slashes '\'
* for compatibility with Amiga and UNIX file systems etc.
*
* @param zip: zip archive handler.
*
* @return the pointer to the current zip entry name, or NULL on error.
*/
pub fn (mut zentry zip_ptr) name() string {
_name := C.zip_entry_name(zentry)
if _name == 0 {
return ''
}
return tos_clone(_name)
}
/**
* index returns an index of the current zip entry.
*
* @param zip zip archive handler.
*
* @return the index on success, negative number (< 0) on error.
*/
pub fn (mut zentry zip_ptr) index() ?int {
_index := int(C.zip_entry_index(zentry))
if _index == -1 {
return error('szip: cannot get current index of zip entry')
}
return _index // must be check for INVALID_VALUE
}
/**
* isdir determines if the current zip entry is a directory entry.
*
* @param zip zip archive handler.
*
* @return the return code - 1 (true), 0 (false), negative number (< 0) on
* error.
*/
pub fn (mut zentry zip_ptr) isdir() ?bool {
_isdir := C.zip_entry_isdir(zentry)
if _isdir == -1 {
return error('szip: cannot check entry type')
}
dir := bool(_isdir) // wtf V , unary lvalue
return dir
}
/**
* size returns an uncompressed size of the current zip entry.
*
* @param zip zip archive handler.
*
* @return the uncompressed size in bytes.
*/
pub fn (mut zentry zip_ptr) size() i64 {
_size := i64(C.zip_entry_size(zentry))
return _size
}
/**
* crc32 returns CRC-32 checksum of the current zip entry.
*
* @param zip zip archive handler.
*
* @return the CRC-32 checksum.
*/
pub fn (mut zentry zip_ptr) crc32() u32 {
_checksum := u32(C.zip_entry_crc32(zentry))
return _checksum // 0
}
/**
* write_entry compresses an input buffer for the current zip entry.
*
* @param zip zip archive handler.
* @param buf input buffer.
* @param bufsize input buffer size (in bytes).
*
* @return the return code - 0 on success, negative number (< 0) on error.
*/
pub fn (mut zentry zip_ptr) write_entry(data []byte) bool {
if (data[0] & 0xff) == -1 {
return false
}
buf := data // alias of data
res := C.zip_entry_write(zentry, buf.data, buf.len)
return res == 0
}
/**
* create_entry compresses a file for the current zip entry.
*
* @param zip zip archive handler.
* @param filename input file.
*
* @return the return code - 0 on success, negative number (< 0) on error.
*/
pub fn (mut zentry zip_ptr) create_entry(name string) bool {
res := C.zip_entry_fwrite(zentry, name.str)
return res == 0
}
/**
* read_entry extracts the current zip entry into output buffer.
*
* The function allocates sufficient memory for an output buffer.
*
* @param zip zip archive handler.
* @param buf output buffer.
* @param bufsize output buffer size (in bytes).
*
* @note remember to release the memory allocated for an output buffer.
* for large entries, please take a look at zip_entry_extract function.
*
* @return the return code - the number of bytes actually read on success.
* Otherwise a -1 on error.
*/
pub fn (mut zentry zip_ptr) read_entry() ?voidptr {
mut _buf := voidptr(0)
mut _bsize := i64(0)
res := C.zip_entry_read(zentry, &_buf, &_bsize)
if res == -1 {
return error('szip: cannot read properly data from entry')
}
return _buf
}
/**
* extract_entry extracts the current zip entry into output file.
*
* @param zip zip archive handler.
* @param filename output file.
*
* @return the return code - 0 on success, negative number (< 0) on error.
*/
pub fn (mut zentry zip_ptr) extract_entry(path string) /*?*/bool {
if C.access(path.str, 0) == -1 {
return false
//return error('Cannot open file for extracting, file not exists')
}
res := C.zip_entry_fread(zentry, path.str)
return res == 0
}
/**
* extract extracts the current zip entry using a callback function (on_extract).
*
* @param zip zip archive handler.
* @param on_extract callback function.
* @param arg opaque pointer (optional argument, which you can pass to the
* on_extract callback)
*
* @return the return code - 0 on success, negative number (< 0) on error.
*/
/*fn (mut zentry zip_ptr) extract(path string) bool {
if C.access(path.str, 0) == -1 {
return false
//return error('Cannot open directory for extracting, directory not exists')
}
res := C.zip_extract(zentry, path.str, 0, 0)
return res == 0
}*/
/**
* total returns the number of all entries (files and directories) in the zip archive.
*
* @param zip zip archive handler.
*
* @return the return code - the number of entries on success, negative number
* (< 0) on error.
*/
pub fn (mut zentry zip_ptr) total() ?int {
_tentry := int(C.zip_total_entries(zentry))
if _tentry == -1 {
return error('szip: cannot count total entries')
}
return _tentry
}