third_party/zlib/google/zip_internal.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "third_party/zlib/google/zip.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/logging.h"
  10 #include "base/strings/utf_string_conversions.h"
  11
  12 #if defined(USE_SYSTEM_MINIZIP)
  13 #include <minizip/ioapi.h>
  14 #include <minizip/unzip.h>
  15 #include <minizip/zip.h>
  16 #else
  17 #include "third_party/zlib/contrib/minizip/unzip.h"
  18 #include "third_party/zlib/contrib/minizip/zip.h"
  19 #if defined(OS_WIN)
  20 #include "third_party/zlib/contrib/minizip/iowin32.h"
  21 #elif defined(OS_POSIX)
  22 #include "third_party/zlib/contrib/minizip/ioapi.h"
  23 #endif  // defined(OS_POSIX)
  24 #endif  // defined(USE_SYSTEM_MINIZIP)
  25
  26 namespace {
  27
  28 #if defined(OS_WIN)
  29 typedef struct {
  30   HANDLE hf;
  31   int error;
  32 } WIN32FILE_IOWIN;
  33
  34 // This function is derived from third_party/minizip/iowin32.c.
  35 // Its only difference is that it treats the char* as UTF8 and
  36 // uses the Unicode version of CreateFile.
  37 void* ZipOpenFunc(void *opaque, const char* filename, int mode) {
  38   DWORD desired_access, creation_disposition;
  39   DWORD share_mode, flags_and_attributes;
  40   HANDLE file = 0;
  41   void* ret = NULL;
  42
  43   desired_access = share_mode = flags_and_attributes = 0;
  44
  45   if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER) == ZLIB_FILEFUNC_MODE_READ) {
  46     desired_access = GENERIC_READ;
  47     creation_disposition = OPEN_EXISTING;
  48     share_mode = FILE_SHARE_READ;
  49   } else if (mode & ZLIB_FILEFUNC_MODE_EXISTING) {
  50     desired_access = GENERIC_WRITE | GENERIC_READ;
  51     creation_disposition = OPEN_EXISTING;
  52   } else if (mode & ZLIB_FILEFUNC_MODE_CREATE) {
  53     desired_access = GENERIC_WRITE | GENERIC_READ;
  54     creation_disposition = CREATE_ALWAYS;
  55   }
  56
  57   base::string16 filename16 = base::UTF8ToUTF16(filename);
  58   if ((filename != NULL) && (desired_access != 0)) {
  59     file = CreateFile(filename16.c_str(), desired_access, share_mode,
  60         NULL, creation_disposition, flags_and_attributes, NULL);
  61   }
  62
  63   if (file == INVALID_HANDLE_VALUE)
  64     file = NULL;
  65
  66   if (file != NULL) {
  67     WIN32FILE_IOWIN file_ret;
  68     file_ret.hf = file;
  69     file_ret.error = 0;
  70     ret = malloc(sizeof(WIN32FILE_IOWIN));
  71     if (ret == NULL)
  72       CloseHandle(file);
  73     else
  74       *(static_cast<WIN32FILE_IOWIN*>(ret)) = file_ret;
  75   }
  76   return ret;
  77 }
  78 #endif
  79
  80 #if defined(OS_POSIX)
  81 // Callback function for zlib that opens a file stream from a file descriptor.
  82 void* FdOpenFileFunc(void* opaque, const char* filename, int mode) {
  83   FILE* file = NULL;
  84   const char* mode_fopen = NULL;
  85
  86   if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER) == ZLIB_FILEFUNC_MODE_READ)
  87     mode_fopen = "rb";
  88   else if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
  89     mode_fopen = "r+b";
  90   else if (mode & ZLIB_FILEFUNC_MODE_CREATE)
  91     mode_fopen = "wb";
  92
  93   if ((filename != NULL) && (mode_fopen != NULL))
  94     file = fdopen(*static_cast<int*>(opaque), mode_fopen);
  95
  96   return file;
  97 }
  98
  99 // We don't actually close the file stream since that would close
 100 // the underlying file descriptor, and we don't own it. However we do need to
 101 // flush buffers and free |opaque| since we malloc'ed it in FillFdOpenFileFunc.
 102 int CloseFileFunc(void* opaque, void* stream) {
 103   fflush(static_cast<FILE*>(stream));
 104   free(opaque);
 105   return 0;
 106 }
 107
 108 // Fills |pzlib_filecunc_def| appropriately to handle the zip file
 109 // referred to by |fd|.
 110 void FillFdOpenFileFunc(zlib_filefunc_def* pzlib_filefunc_def, int fd) {
 111   fill_fopen_filefunc(pzlib_filefunc_def);
 112   pzlib_filefunc_def->zopen_file = FdOpenFileFunc;
 113   pzlib_filefunc_def->zclose_file = CloseFileFunc;
 114   int* ptr_fd = static_cast<int*>(malloc(sizeof(fd)));
 115   *ptr_fd = fd;
 116   pzlib_filefunc_def->opaque = ptr_fd;
 117 }
 118 #endif  // defined(OS_POSIX)
 119
 120 #if defined(OS_WIN)
 121 // Callback function for zlib that opens a file stream from a Windows handle.
 122 void* HandleOpenFileFunc(void* opaque, const char* filename, int mode) {
 123   WIN32FILE_IOWIN file_ret;
 124   file_ret.hf = static_cast<HANDLE>(opaque);
 125   file_ret.error = 0;
 126   if (file_ret.hf == INVALID_HANDLE_VALUE)
 127     return NULL;
 128
 129   void* ret = malloc(sizeof(WIN32FILE_IOWIN));
 130   if (ret != NULL)
 131     *(static_cast<WIN32FILE_IOWIN*>(ret)) = file_ret;
 132   return ret;
 133 }
 134 #endif
 135
 136 // A struct that contains data required for zlib functions to extract files from
 137 // a zip archive stored in memory directly. The following I/O API functions
 138 // expect their opaque parameters refer to this struct.
 139 struct ZipBuffer {
 140   const char* data;  // weak
 141   size_t length;
 142   size_t offset;
 143 };
 144
 145 // Opens the specified file. When this function returns a non-NULL pointer, zlib
 146 // uses this pointer as a stream parameter while compressing or uncompressing
 147 // data. (Returning NULL represents an error.) This function initializes the
 148 // given opaque parameter and returns it because this parameter stores all
 149 // information needed for uncompressing data. (This function does not support
 150 // writing compressed data and it returns NULL for this case.)
 151 void* OpenZipBuffer(void* opaque, const char* /*filename*/, int mode) {
 152   if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER) != ZLIB_FILEFUNC_MODE_READ) {
 153     NOTREACHED();
 154     return NULL;
 155   }
 156   ZipBuffer* buffer = static_cast<ZipBuffer*>(opaque);
 157   if (!buffer || !buffer->data || !buffer->length)
 158     return NULL;
 159   buffer->offset = 0;
 160   return opaque;
 161 }
 162
 163 // Reads compressed data from the specified stream. This function copies data
 164 // refered by the opaque parameter and returns the size actually copied.
 165 uLong ReadZipBuffer(void* opaque, void* /*stream*/, void* buf, uLong size) {
 166   ZipBuffer* buffer = static_cast<ZipBuffer*>(opaque);
 167   DCHECK_LE(buffer->offset, buffer->length);
 168   size_t remaining_bytes = buffer->length - buffer->offset;
 169   if (!buffer || !buffer->data || !remaining_bytes)
 170     return 0;
 171   size = std::min(size, static_cast<uLong>(remaining_bytes));
 172   memcpy(buf, &buffer->data[buffer->offset], size);
 173   buffer->offset += size;
 174   return size;
 175 }
 176
 177 // Writes compressed data to the stream. This function always returns zero
 178 // because this implementation is only for reading compressed data.
 179 uLong WriteZipBuffer(void* /*opaque*/,
 180                      void* /*stream*/,
 181                      const void* /*buf*/,
 182                      uLong /*size*/) {
 183   NOTREACHED();
 184   return 0;
 185 }
 186
 187 // Returns the offset from the beginning of the data.
 188 long GetOffsetOfZipBuffer(void* opaque, void* /*stream*/) {
 189   ZipBuffer* buffer = static_cast<ZipBuffer*>(opaque);
 190   if (!buffer)
 191     return -1;
 192   return static_cast<long>(buffer->offset);
 193 }
 194
 195 // Moves the current offset to the specified position.
 196 long SeekZipBuffer(void* opaque, void* /*stream*/, uLong offset, int origin) {
 197   ZipBuffer* buffer = static_cast<ZipBuffer*>(opaque);
 198   if (!buffer)
 199     return -1;
 200   if (origin == ZLIB_FILEFUNC_SEEK_CUR) {
 201     buffer->offset = std::min(buffer->offset + static_cast<size_t>(offset),
 202                               buffer->length);
 203     return 0;
 204   }
 205   if (origin == ZLIB_FILEFUNC_SEEK_END) {
 206     buffer->offset = (buffer->length > offset) ? buffer->length - offset : 0;
 207     return 0;
 208   }
 209   if (origin == ZLIB_FILEFUNC_SEEK_SET) {
 210     buffer->offset = std::min(buffer->length, static_cast<size_t>(offset));
 211     return 0;
 212   }
 213   NOTREACHED();
 214   return -1;
 215 }
 216
 217 // Closes the input offset and deletes all resources used for compressing or
 218 // uncompressing data. This function deletes the ZipBuffer object referred by
 219 // the opaque parameter since zlib deletes the unzFile object and it does not
 220 // use this object any longer.
 221 int CloseZipBuffer(void* opaque, void* /*stream*/) {
 222   if (opaque)
 223     free(opaque);
 224   return 0;
 225 }
 226
 227 // Returns the last error happened when reading or writing data. This function
 228 // always returns zero, which means there are not any errors.
 229 int GetErrorOfZipBuffer(void* /*opaque*/, void* /*stream*/) {
 230   return 0;
 231 }
 232
 233 }  // namespace
 234
 235 namespace zip {
 236 namespace internal {
 237
 238 unzFile OpenForUnzipping(const std::string& file_name_utf8) {
 239   zlib_filefunc_def* zip_func_ptrs = NULL;
 240 #if defined(OS_WIN)
 241   zlib_filefunc_def zip_funcs;
 242   fill_win32_filefunc(&zip_funcs);
 243   zip_funcs.zopen_file = ZipOpenFunc;
 244   zip_func_ptrs = &zip_funcs;
 245 #endif
 246   return unzOpen2(file_name_utf8.c_str(), zip_func_ptrs);
 247 }
 248
 249 #if defined(OS_POSIX)
 250 unzFile OpenFdForUnzipping(int zip_fd) {
 251   zlib_filefunc_def zip_funcs;
 252   FillFdOpenFileFunc(&zip_funcs, zip_fd);
 253   // Passing dummy "fd" filename to zlib.
 254   return unzOpen2("fd", &zip_funcs);
 255 }
 256 #endif
 257
 258 #if defined(OS_WIN)
 259 unzFile OpenHandleForUnzipping(HANDLE zip_handle) {
 260   zlib_filefunc_def zip_funcs;
 261   fill_win32_filefunc(&zip_funcs);
 262   zip_funcs.zopen_file = HandleOpenFileFunc;
 263   zip_funcs.opaque = zip_handle;
 264   return unzOpen2("fd", &zip_funcs);
 265 }
 266 #endif
 267
 268 // static
 269 unzFile PreprareMemoryForUnzipping(const std::string& data) {
 270   if (data.empty())
 271     return NULL;
 272
 273   ZipBuffer* buffer = static_cast<ZipBuffer*>(malloc(sizeof(ZipBuffer)));
 274   if (!buffer)
 275     return NULL;
 276   buffer->data = data.data();
 277   buffer->length = data.length();
 278   buffer->offset = 0;
 279
 280   zlib_filefunc_def zip_functions;
 281   zip_functions.zopen_file = OpenZipBuffer;
 282   zip_functions.zread_file = ReadZipBuffer;
 283   zip_functions.zwrite_file = WriteZipBuffer;
 284   zip_functions.ztell_file = GetOffsetOfZipBuffer;
 285   zip_functions.zseek_file = SeekZipBuffer;
 286   zip_functions.zclose_file = CloseZipBuffer;
 287   zip_functions.zerror_file = GetErrorOfZipBuffer;
 288   zip_functions.opaque = static_cast<void*>(buffer);
 289   return unzOpen2(NULL, &zip_functions);
 290 }
 291
 292 zipFile OpenForZipping(const std::string& file_name_utf8, int append_flag) {
 293   zlib_filefunc_def* zip_func_ptrs = NULL;
 294 #if defined(OS_WIN)
 295   zlib_filefunc_def zip_funcs;
 296   fill_win32_filefunc(&zip_funcs);
 297   zip_funcs.zopen_file = ZipOpenFunc;
 298   zip_func_ptrs = &zip_funcs;
 299 #endif
 300   return zipOpen2(file_name_utf8.c_str(),
 301                   append_flag,
 302                   NULL,  // global comment
 303                   zip_func_ptrs);
 304 }
 305
 306 #if defined(OS_POSIX)
 307 zipFile OpenFdForZipping(int zip_fd, int append_flag) {
 308   zlib_filefunc_def zip_funcs;
 309   FillFdOpenFileFunc(&zip_funcs, zip_fd);
 310   // Passing dummy "fd" filename to zlib.
 311   return zipOpen2("fd", append_flag, NULL, &zip_funcs);
 312 }
 313 #endif
 314
 315 }  // namespace internal
 316 }  // namespace zip