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// 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 "chrome/common/zip.h"
#include "base/utf_string_conversions.h"
#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
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, creation_disposition;
DWORD share_mode, flags_and_attributes;
HANDLE file = 0;
void* ret = NULL;
desired_access = share_mode = flags_and_attributes = 0;
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;
}
string16 filename16 = 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.
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))
file = fdopen(*static_cast<int*>(opaque), mode_fopen);
return file;
}
// We don't actually close the file stream since that would close
// the underlying file descriptor, and we don't own it. We do free
// |opaque| since we malloc'ed it in FillFdOpenFileFunc.
int CloseFileFunc(void* opaque, void* stream) {
free(opaque);
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 = CloseFileFunc;
int* ptr_fd = static_cast<int*>(malloc(sizeof(fd)));
*ptr_fd = fd;
pzlib_filefunc_def->opaque = ptr_fd;
}
#endif // defined(OS_POSIX)
} // 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
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);
}
} // namespace internal
} // namespace zip
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