lts/deps/zlib/google/zip_internal.cc
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/zlib/google/zip_internal.h"
#include <stddef.h>
#include <algorithm>
#include "base/logging.h"
#include "base/strings/utf_string_conversions.h"
#if defined(USE_SYSTEM_MINIZIP)
#include <minizip/ioapi.h>
#include <minizip/unzip.h>
#include <minizip/zip.h>
#else
#include "third_party/zlib/contrib/minizip/unzip.h"
#include "third_party/zlib/contrib/minizip/zip.h"
#if defined(OS_WIN)
#include "third_party/zlib/contrib/minizip/iowin32.h"
#elif defined(OS_POSIX)
#include "third_party/zlib/contrib/minizip/ioapi.h"
#endif // defined(OS_POSIX)
#endif // defined(USE_SYSTEM_MINIZIP)
namespace {
#if defined(OS_WIN)
typedef struct {
HANDLE hf;
int error;
} WIN32FILE_IOWIN;
// This function is derived from third_party/minizip/iowin32.c.
// Its only difference is that it treats the char* as UTF8 and
// uses the Unicode version of CreateFile.
void* ZipOpenFunc(void *opaque, const char* filename, int mode) {
DWORD desired_access = 0, creation_disposition = 0;
DWORD share_mode = 0, flags_and_attributes = 0;
HANDLE file = 0;
void* ret = NULL;
if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER) == ZLIB_FILEFUNC_MODE_READ) {
desired_access = GENERIC_READ;
creation_disposition = OPEN_EXISTING;
share_mode = FILE_SHARE_READ;
} else if (mode & ZLIB_FILEFUNC_MODE_EXISTING) {
desired_access = GENERIC_WRITE | GENERIC_READ;
creation_disposition = OPEN_EXISTING;
} else if (mode & ZLIB_FILEFUNC_MODE_CREATE) {
desired_access = GENERIC_WRITE | GENERIC_READ;
creation_disposition = CREATE_ALWAYS;
}
base::string16 filename16 = base::UTF8ToUTF16(filename);
if ((filename != NULL) && (desired_access != 0)) {
file = CreateFile(filename16.c_str(), desired_access, share_mode,
NULL, creation_disposition, flags_and_attributes, NULL);
}
if (file == INVALID_HANDLE_VALUE)
file = NULL;
if (file != NULL) {
WIN32FILE_IOWIN file_ret;
file_ret.hf = file;
file_ret.error = 0;
ret = malloc(sizeof(WIN32FILE_IOWIN));
if (ret == NULL)
CloseHandle(file);
else
*(static_cast<WIN32FILE_IOWIN*>(ret)) = file_ret;
}
return ret;
}
#endif
#if defined(OS_POSIX)
// Callback function for zlib that opens a file stream from a file descriptor.
// Since we do not own the file descriptor, dup it so that we can fdopen/fclose
// a file stream.
void* FdOpenFileFunc(void* opaque, const char* filename, int mode) {
FILE* file = NULL;
const char* mode_fopen = NULL;
if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER) == ZLIB_FILEFUNC_MODE_READ)
mode_fopen = "rb";
else if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
mode_fopen = "r+b";
else if (mode & ZLIB_FILEFUNC_MODE_CREATE)
mode_fopen = "wb";
if ((filename != NULL) && (mode_fopen != NULL)) {
int fd = dup(*static_cast<int*>(opaque));
if (fd != -1)
file = fdopen(fd, mode_fopen);
}
return file;
}
int FdCloseFileFunc(void* opaque, void* stream) {
fclose(static_cast<FILE*>(stream));
free(opaque); // malloc'ed in FillFdOpenFileFunc()
return 0;
}
// Fills |pzlib_filecunc_def| appropriately to handle the zip file
// referred to by |fd|.
void FillFdOpenFileFunc(zlib_filefunc_def* pzlib_filefunc_def, int fd) {
fill_fopen_filefunc(pzlib_filefunc_def);
pzlib_filefunc_def->zopen_file = FdOpenFileFunc;
pzlib_filefunc_def->zclose_file = FdCloseFileFunc;
int* ptr_fd = static_cast<int*>(malloc(sizeof(fd)));
*ptr_fd = fd;
pzlib_filefunc_def->opaque = ptr_fd;
}
#endif // defined(OS_POSIX)
#if defined(OS_WIN)
// Callback function for zlib that opens a file stream from a Windows handle.
// Does not take ownership of the handle.
void* HandleOpenFileFunc(void* opaque, const char* filename, int mode) {
WIN32FILE_IOWIN file_ret;
file_ret.hf = static_cast<HANDLE>(opaque);
file_ret.error = 0;
if (file_ret.hf == INVALID_HANDLE_VALUE)
return NULL;
void* ret = malloc(sizeof(WIN32FILE_IOWIN));
if (ret != NULL)
*(static_cast<WIN32FILE_IOWIN*>(ret)) = file_ret;
return ret;
}
int HandleCloseFileFunc(void* opaque, void* stream) {
free(stream); // malloc'ed in HandleOpenFileFunc()
return 0;
}
#endif
// A struct that contains data required for zlib functions to extract files from
// a zip archive stored in memory directly. The following I/O API functions
// expect their opaque parameters refer to this struct.
struct ZipBuffer {
const char* data; // weak
size_t length;
size_t offset;
};
// Opens the specified file. When this function returns a non-NULL pointer, zlib
// uses this pointer as a stream parameter while compressing or uncompressing
// data. (Returning NULL represents an error.) This function initializes the
// given opaque parameter and returns it because this parameter stores all
// information needed for uncompressing data. (This function does not support
// writing compressed data and it returns NULL for this case.)
void* OpenZipBuffer(void* opaque, const char* /*filename*/, int mode) {
if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER) != ZLIB_FILEFUNC_MODE_READ) {
NOTREACHED();
return NULL;
}
ZipBuffer* buffer = static_cast<ZipBuffer*>(opaque);
if (!buffer || !buffer->data || !buffer->length)
return NULL;
buffer->offset = 0;
return opaque;
}
// Reads compressed data from the specified stream. This function copies data
// refered by the opaque parameter and returns the size actually copied.
uLong ReadZipBuffer(void* opaque, void* /*stream*/, void* buf, uLong size) {
ZipBuffer* buffer = static_cast<ZipBuffer*>(opaque);
DCHECK_LE(buffer->offset, buffer->length);
size_t remaining_bytes = buffer->length - buffer->offset;
if (!buffer || !buffer->data || !remaining_bytes)
return 0;
size = std::min(size, static_cast<uLong>(remaining_bytes));
memcpy(buf, &buffer->data[buffer->offset], size);
buffer->offset += size;
return size;
}
// Writes compressed data to the stream. This function always returns zero
// because this implementation is only for reading compressed data.
uLong WriteZipBuffer(void* /*opaque*/,
void* /*stream*/,
const void* /*buf*/,
uLong /*size*/) {
NOTREACHED();
return 0;
}
// Returns the offset from the beginning of the data.
long GetOffsetOfZipBuffer(void* opaque, void* /*stream*/) {
ZipBuffer* buffer = static_cast<ZipBuffer*>(opaque);
if (!buffer)
return -1;
return static_cast<long>(buffer->offset);
}
// Moves the current offset to the specified position.
long SeekZipBuffer(void* opaque, void* /*stream*/, uLong offset, int origin) {
ZipBuffer* buffer = static_cast<ZipBuffer*>(opaque);
if (!buffer)
return -1;
if (origin == ZLIB_FILEFUNC_SEEK_CUR) {
buffer->offset = std::min(buffer->offset + static_cast<size_t>(offset),
buffer->length);
return 0;
}
if (origin == ZLIB_FILEFUNC_SEEK_END) {
buffer->offset = (buffer->length > offset) ? buffer->length - offset : 0;
return 0;
}
if (origin == ZLIB_FILEFUNC_SEEK_SET) {
buffer->offset = std::min(buffer->length, static_cast<size_t>(offset));
return 0;
}
NOTREACHED();
return -1;
}
// Closes the input offset and deletes all resources used for compressing or
// uncompressing data. This function deletes the ZipBuffer object referred by
// the opaque parameter since zlib deletes the unzFile object and it does not
// use this object any longer.
int CloseZipBuffer(void* opaque, void* /*stream*/) {
if (opaque)
free(opaque);
return 0;
}
// Returns the last error happened when reading or writing data. This function
// always returns zero, which means there are not any errors.
int GetErrorOfZipBuffer(void* /*opaque*/, void* /*stream*/) {
return 0;
}
// Returns a zip_fileinfo struct with the time represented by |file_time|.
zip_fileinfo TimeToZipFileInfo(const base::Time& file_time) {
base::Time::Exploded file_time_parts;
file_time.LocalExplode(&file_time_parts);
zip_fileinfo zip_info = {};
if (file_time_parts.year >= 1980) {
// This if check works around the handling of the year value in
// contrib/minizip/zip.c in function zip64local_TmzDateToDosDate
// It assumes that dates below 1980 are in the double digit format.
// Hence the fail safe option is to leave the date unset. Some programs
// might show the unset date as 1980-0-0 which is invalid.
zip_info.tmz_date.tm_year = file_time_parts.year;
zip_info.tmz_date.tm_mon = file_time_parts.month - 1;
zip_info.tmz_date.tm_mday = file_time_parts.day_of_month;
zip_info.tmz_date.tm_hour = file_time_parts.hour;
zip_info.tmz_date.tm_min = file_time_parts.minute;
zip_info.tmz_date.tm_sec = file_time_parts.second;
}
return zip_info;
}
} // namespace
namespace zip {
namespace internal {
unzFile OpenForUnzipping(const std::string& file_name_utf8) {
zlib_filefunc_def* zip_func_ptrs = NULL;
#if defined(OS_WIN)
zlib_filefunc_def zip_funcs;
fill_win32_filefunc(&zip_funcs);
zip_funcs.zopen_file = ZipOpenFunc;
zip_func_ptrs = &zip_funcs;
#endif
return unzOpen2(file_name_utf8.c_str(), zip_func_ptrs);
}
#if defined(OS_POSIX)
unzFile OpenFdForUnzipping(int zip_fd) {
zlib_filefunc_def zip_funcs;
FillFdOpenFileFunc(&zip_funcs, zip_fd);
// Passing dummy "fd" filename to zlib.
return unzOpen2("fd", &zip_funcs);
}
#endif
#if defined(OS_WIN)
unzFile OpenHandleForUnzipping(HANDLE zip_handle) {
zlib_filefunc_def zip_funcs;
fill_win32_filefunc(&zip_funcs);
zip_funcs.zopen_file = HandleOpenFileFunc;
zip_funcs.zclose_file = HandleCloseFileFunc;
zip_funcs.opaque = zip_handle;
return unzOpen2("fd", &zip_funcs);
}
#endif
// static
unzFile PrepareMemoryForUnzipping(const std::string& data) {
if (data.empty())
return NULL;
ZipBuffer* buffer = static_cast<ZipBuffer*>(malloc(sizeof(ZipBuffer)));
if (!buffer)
return NULL;
buffer->data = data.data();
buffer->length = data.length();
buffer->offset = 0;
zlib_filefunc_def zip_functions;
zip_functions.zopen_file = OpenZipBuffer;
zip_functions.zread_file = ReadZipBuffer;
zip_functions.zwrite_file = WriteZipBuffer;
zip_functions.ztell_file = GetOffsetOfZipBuffer;
zip_functions.zseek_file = SeekZipBuffer;
zip_functions.zclose_file = CloseZipBuffer;
zip_functions.zerror_file = GetErrorOfZipBuffer;
zip_functions.opaque = static_cast<void*>(buffer);
return unzOpen2(NULL, &zip_functions);
}
zipFile OpenForZipping(const std::string& file_name_utf8, int append_flag) {
zlib_filefunc_def* zip_func_ptrs = NULL;
#if defined(OS_WIN)
zlib_filefunc_def zip_funcs;
fill_win32_filefunc(&zip_funcs);
zip_funcs.zopen_file = ZipOpenFunc;
zip_func_ptrs = &zip_funcs;
#endif
return zipOpen2(file_name_utf8.c_str(),
append_flag,
NULL, // global comment
zip_func_ptrs);
}
#if defined(OS_POSIX)
zipFile OpenFdForZipping(int zip_fd, int append_flag) {
zlib_filefunc_def zip_funcs;
FillFdOpenFileFunc(&zip_funcs, zip_fd);
// Passing dummy "fd" filename to zlib.
return zipOpen2("fd", append_flag, NULL, &zip_funcs);
}
#endif
bool ZipOpenNewFileInZip(zipFile zip_file,
const std::string& str_path,
base::Time last_modified_time) {
// Section 4.4.4 http://www.pkware.com/documents/casestudies/APPNOTE.TXT
// Setting the Language encoding flag so the file is told to be in utf-8.
const uLong LANGUAGE_ENCODING_FLAG = 0x1 << 11;
zip_fileinfo file_info = TimeToZipFileInfo(last_modified_time);
if (ZIP_OK != zipOpenNewFileInZip4(zip_file, // file
str_path.c_str(), // filename
&file_info, // zip_fileinfo
NULL, // extrafield_local,
0u, // size_extrafield_local
NULL, // extrafield_global
0u, // size_extrafield_global
NULL, // comment
Z_DEFLATED, // method
Z_DEFAULT_COMPRESSION, // level
0, // raw
-MAX_WBITS, // windowBits
DEF_MEM_LEVEL, // memLevel
Z_DEFAULT_STRATEGY, // strategy
NULL, // password
0, // crcForCrypting
0, // versionMadeBy
LANGUAGE_ENCODING_FLAG)) { // flagBase
DLOG(ERROR) << "Could not open zip file entry " << str_path;
return false;
}
return true;
}
} // namespace internal
} // namespace zip