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v/vlib/szip/szip.v
2021-02-22 14:59:36 +02:00

208 lines
5.5 KiB
V

module szip
#flag -I @VROOT/thirdparty/zip
#include "zip.c"
#include "zip.h"
struct C.zip_t {
}
type Zip = C.zip_t
fn C.zip_open(byteptr, int, byte) &Zip
fn C.zip_close(&Zip)
fn C.zip_entry_open(&Zip, byteptr) int
fn C.zip_entry_close(&Zip) int
fn C.zip_entry_name(&Zip) byteptr
fn C.zip_entry_index(&Zip) int
fn C.zip_entry_isdir(&Zip) int
fn C.zip_entry_size(&Zip) u64
fn C.zip_entry_crc32(&Zip) u32
fn C.zip_entry_write(&Zip, voidptr, int) int
fn C.zip_entry_fwrite(&Zip, byteptr) int
fn C.zip_entry_read(&Zip, byteptr, int) int
fn C.zip_entry_fread(&Zip, byteptr) int
fn C.zip_total_entries(&Zip) int
// compression level - ref: miniz.h
const (
no_compression = 0
best_speed = 1
best_compression = 9
uber_compression = 10
default_level = 6
default_compression = -1
)
const (
m_write = `w`
m_ronly = `r`
m_append = `a`
)
// open opens zip archive with compression level using the given mode.<br>
// compression levels: 0-9 are the standard zlib-style levels.<br>
// modes:<br>
// - 'r': opens a file for reading/extracting (the file must exists).<br>
// - 'w': creates an empty file for writing.<br>
// - 'a': appends to an existing archive.
pub fn open(name string, level int, mode byte) ?&Zip {
mut nlevel := level
if (nlevel & 0xF) > szip.uber_compression {
nlevel = szip.default_level
}
if name.len == 0 {
return error('szip: name of file empty')
}
if mode !in [szip.m_write, szip.m_ronly, szip.m_append] {
return error('szip: invalid provided open mode')
}
p_zip := &Zip(C.zip_open(name.str, nlevel, mode))
if isnil(p_zip) {
return error('szip: cannot open/create/append new zip archive')
}
return p_zip
}
// close closes the zip archive, releases resources - always finalize.
pub fn (mut z Zip) 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.
pub fn (mut zentry Zip) open_entry(name string) ? {
res := C.zip_entry_open(zentry, name.str)
if res == -1 {
return error('szip: cannot open archive entry')
}
}
// close_entry closes a zip entry, flushes buffer and releases resources.
pub fn (mut zentry Zip) 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.
pub fn (mut zentry Zip) name() string {
name := C.zip_entry_name(zentry)
if name == 0 {
return ''
}
return unsafe { tos_clone(name) }
}
/// index returns an index of the current zip entry.
pub fn (mut zentry Zip) 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
}
// is_dir determines if the current zip entry is a directory entry.
pub fn (mut zentry Zip) is_dir() ?bool {
isdir := C.zip_entry_isdir(zentry)
if isdir < 0 {
return error('szip: cannot check entry type')
}
return isdir == 1
}
// size returns an uncompressed size of the current zip entry.
pub fn (mut zentry Zip) size() u64 {
return C.zip_entry_size(zentry)
}
// crc32 returns CRC-32 checksum of the current zip entry.
pub fn (mut zentry Zip) crc32() u32 {
return C.zip_entry_crc32(zentry)
}
// write_entry compresses an input buffer for the current zip entry.
pub fn (mut zentry Zip) write_entry(data []byte) ? {
if (data[0] & 0xff) == -1 {
return error('szip: cannot write entry')
}
res := C.zip_entry_write(zentry, data.data, data.len)
if res != 0 {
return error('szip: failed to write entry')
}
}
// create_entry compresses a file for the current zip entry.
pub fn (mut zentry Zip) create_entry(name string) ? {
res := C.zip_entry_fwrite(zentry, name.str)
if res != 0 {
return error('szip: failed to create entry')
}
}
// read_entry extracts the current zip entry into output buffer.
// The function allocates sufficient memory for an output buffer.
// NOTE: remember to release the memory allocated for an output buffer.
// for large entries, please take a look at zip_entry_extract function.
pub fn (mut zentry Zip) 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.
pub fn (mut zentry Zip) extract_entry(path string) ? {
if C.access(charptr(path.str), 0) == -1 {
return error('Cannot open file for extracting, file not exists')
}
res := C.zip_entry_fread(zentry, path.str)
if res != 0 {
return error('szip: failed to extract entry')
}
}
/*
extract extracts the current zip entry using a callback function (on_extract).
fn (mut zentry Zip) 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.
pub fn (mut zentry Zip) total() ?int {
tentry := int(C.zip_total_entries(zentry))
if tentry == -1 {
return error('szip: cannot count total entries')
}
return tentry
}