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#
#
# Nimrod's Runtime Library
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module implements a zip archive creator/reader/modifier.
import
streams, libzip, times, os
type
TZipArchive* = object of TObject ## represents a zip archive
mode: TFileMode
w: PZip
proc zipError(z: var TZipArchive) =
var e: ref EIO
new(e)
e.msg = $zip_strerror(z.w)
raise e
proc open*(z: var TZipArchive, filename: string, mode: TFileMode = fmRead): bool =
## Opens a zip file for reading, writing or appending. All file modes are
## supported. Returns true iff successful, false otherwise.
var err, flags: int32
case mode
of fmRead, fmReadWriteExisting, fmAppend: flags = 0
of fmWrite:
if existsFile(filename): removeFile(filename)
flags = ZIP_CREATE or ZIP_EXCL
of fmReadWrite: flags = ZIP_CREATE
z.w = zip_open(filename, flags, addr(err))
z.mode = mode
result = z.w != nil
proc close*(z: var TZipArchive) =
## Closes a zip file.
zip_close(z.w)
proc createDir*(z: var TZipArchive, dir: string) =
## Creates a directory within the `z` archive. This does not fail if the
## directory already exists. Note that for adding a file like
## ``"path1/path2/filename"`` it is not necessary
## to create the ``"path/path2"`` subdirectories - it will be done
## automatically by ``addFile``.
assert(z.mode != fmRead)
discard zip_add_dir(z.w, dir)
zip_error_clear(z.w)
proc addFile*(z: var TZipArchive, dest, src: string) =
## Adds the file `src` to the archive `z` with the name `dest`. `dest`
## may contain a path that will be created.
assert(z.mode != fmRead)
var zipsrc = zip_source_file(z.w, src, 0, -1)
if zipsrc == nil:
#echo("Dest: " & dest)
#echo("Src: " & src)
zipError(z)
if zip_add(z.w, dest, zipsrc) < 0'i32:
zip_source_free(zipsrc)
zipError(z)
proc addFile*(z: var TZipArchive, file: string) =
## A shortcut for ``addFile(z, file, file)``, i.e. the name of the source is
## the name of the destination.
addFile(z, file, file)
proc mySourceCallback(state, data: pointer, len: int,
cmd: Tzip_source_cmd): int {.cdecl.} =
var src = cast[PStream](state)
case cmd
of ZIP_SOURCE_OPEN:
if src.setPositionImpl != nil: setPosition(src, 0) # reset
of ZIP_SOURCE_READ:
result = readData(src, data, len)
of ZIP_SOURCE_CLOSE: close(src)
of ZIP_SOURCE_STAT:
var stat = cast[PZipStat](data)
zip_stat_init(stat)
stat.size = high(int32)-1 # we don't know the size
stat.mtime = getTime()
result = sizeof(TZipStat)
of ZIP_SOURCE_ERROR:
var err = cast[ptr array[0..1, cint]](data)
err[0] = ZIP_ER_INTERNAL
err[1] = 0
result = 2*sizeof(cint)
of constZIP_SOURCE_FREE: GC_unref(src)
else: assert(false)
proc addFile*(z: var TZipArchive, dest: string, src: PStream) =
## Adds a file named with `dest` to the archive `z`. `dest`
## may contain a path. The file's content is read from the `src` stream.
assert(z.mode != fmRead)
GC_ref(src)
var zipsrc = zip_source_function(z.w, mySourceCallback, cast[pointer](src))
if zipsrc == nil: zipError(z)
if zip_add(z.w, dest, zipsrc) < 0'i32:
zip_source_free(zipsrc)
zipError(z)
# -------------- zip file stream ---------------------------------------------
type
TZipFileStream = object of TStream
f: Pzip_file
PZipFileStream* =
ref TZipFileStream ## a reader stream of a file within a zip archive
proc fsClose(s: PStream) = zip_fclose(PZipFileStream(s).f)
proc fsReadData(s: PStream, buffer: pointer, bufLen: int): int =
result = zip_fread(PZipFileStream(s).f, buffer, bufLen)
proc newZipFileStream(f: PZipFile): PZipFileStream =
new(result)
result.f = f
result.closeImpl = fsClose
result.readDataImpl = fsReadData
# other methods are nil!
# ----------------------------------------------------------------------------
proc getStream*(z: var TZipArchive, filename: string): PZipFileStream =
## returns a stream that can be used to read the file named `filename`
## from the archive `z`. Returns nil in case of an error.
## The returned stream does not support the `setPosition`, `getPosition`,
## `writeData` or `atEnd` methods.
var x = zip_fopen(z.w, filename, 0'i32)
if x != nil: result = newZipFileStream(x)
iterator walkFiles*(z: var TZipArchive): string =
## walks over all files in the archive `z` and returns the filename
## (including the path).
var i = 0'i32
var num = zip_get_num_files(z.w)
while i < num:
yield $zip_get_name(z.w, i, 0'i32)
inc(i)
proc extractFile*(z: var TZipArchive, srcFile: string, dest: PStream) =
## extracts a file from the zip archive `z` to the destination stream.
var strm = getStream(z, srcFile)
while true:
if not strm.atEnd:
dest.write(strm.readStr(1))
else: break
dest.flush()
strm.close()
proc extractFile*(z: var TZipArchive, srcFile: string, dest: string) =
## extracts a file from the zip archive `z` to the destination filename.
var file = newFileStream(dest, fmReadWrite)
extractFile(z, srcFile, file)
file.close()
proc extractAll*(z: var TZipArchive, dest: string) =
## extracts all files from archive `z` to the destination directory.
for file in walkFiles(z):
extractFile(z, file, dest / extractFilename(file))
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