1/* Copyright (c) 2013-2015 Jeffrey Pfau
  2 *
  3 * This Source Code Form is subject to the terms of the Mozilla Public
  4 * License, v. 2.0. If a copy of the MPL was not distributed with this
  5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
  6#include "util/vfs.h"
  7
  8#ifdef USE_LZMA
  9
 10#include "util/string.h"
 11
 12#include "third-party/lzma/7z.h"
 13#include "third-party/lzma/7zAlloc.h"
 14#include "third-party/lzma/7zBuf.h"
 15#include "third-party/lzma/7zCrc.h"
 16#include "third-party/lzma/7zFile.h"
 17#include "third-party/lzma/7zVersion.h"
 18
 19struct VDirEntry7z {
 20	struct VDirEntry d;
 21
 22	struct VDir7z* vd;
 23	UInt32 index;
 24	char* utf8;
 25};
 26
 27struct VDir7z {
 28	struct VDir d;
 29	struct VDirEntry7z dirent;
 30
 31	// What is all this garbage?
 32	CFileInStream archiveStream;
 33	CLookToRead lookStream;
 34	CSzArEx db;
 35	ISzAlloc allocImp;
 36	ISzAlloc allocTempImp;
 37};
 38
 39struct VFile7z {
 40	struct VFile d;
 41
 42	struct VDir7z* vd;
 43
 44	size_t offset;
 45
 46	Byte* outBuffer;
 47	size_t bufferOffset;
 48	size_t size;
 49};
 50
 51static bool _vf7zClose(struct VFile* vf);
 52static off_t _vf7zSeek(struct VFile* vf, off_t offset, int whence);
 53static ssize_t _vf7zRead(struct VFile* vf, void* buffer, size_t size);
 54static ssize_t _vf7zWrite(struct VFile* vf, const void* buffer, size_t size);
 55static void* _vf7zMap(struct VFile* vf, size_t size, int flags);
 56static void _vf7zUnmap(struct VFile* vf, void* memory, size_t size);
 57static void _vf7zTruncate(struct VFile* vf, size_t size);
 58static ssize_t _vf7zSize(struct VFile* vf);
 59static bool _vf7zSync(struct VFile* vf, const void* buffer, size_t size);
 60
 61static bool _vd7zClose(struct VDir* vd);
 62static void _vd7zRewind(struct VDir* vd);
 63static struct VDirEntry* _vd7zListNext(struct VDir* vd);
 64static struct VFile* _vd7zOpenFile(struct VDir* vd, const char* path, int mode);
 65static struct VDir* _vd7zOpenDir(struct VDir* vd, const char* path);
 66
 67static const char* _vde7zName(struct VDirEntry* vde);
 68static enum VFSType _vde7zType(struct VDirEntry* vde);
 69
 70struct VDir* VDirOpen7z(const char* path, int flags) {
 71	if (flags & O_WRONLY || flags & O_CREAT) {
 72		return 0;
 73	}
 74
 75	struct VDir7z* vd = malloc(sizeof(struct VDir7z));
 76
 77	// What does any of this mean, Igor?
 78	if (InFile_Open(&vd->archiveStream.file, path)) {
 79		free(vd);
 80		return 0;
 81	}
 82
 83	vd->allocImp.Alloc = SzAlloc;
 84	vd->allocImp.Free = SzFree;
 85
 86	vd->allocTempImp.Alloc = SzAllocTemp;
 87	vd->allocTempImp.Free = SzFreeTemp;
 88
 89	FileInStream_CreateVTable(&vd->archiveStream);
 90	LookToRead_CreateVTable(&vd->lookStream, False);
 91
 92	vd->lookStream.realStream = &vd->archiveStream.s;
 93	LookToRead_Init(&vd->lookStream);
 94
 95	CrcGenerateTable();
 96
 97	SzArEx_Init(&vd->db);
 98	SRes res = SzArEx_Open(&vd->db, &vd->lookStream.s, &vd->allocImp, &vd->allocTempImp);
 99	if (res != SZ_OK) {
100		File_Close(&vd->archiveStream.file);
101		free(vd);
102		return 0;
103	}
104
105	vd->dirent.index = 0;
106	vd->dirent.utf8 = 0;
107	vd->dirent.vd = vd;
108	vd->dirent.d.name = _vde7zName;
109	vd->dirent.d.type = _vde7zType;
110
111	vd->d.close = _vd7zClose;
112	vd->d.rewind = _vd7zRewind;
113	vd->d.listNext = _vd7zListNext;
114	vd->d.openFile = _vd7zOpenFile;
115	vd->d.openDir = _vd7zOpenDir;
116
117	return &vd->d;
118}
119
120bool _vf7zClose(struct VFile* vf) {
121	struct VFile7z* vf7z = (struct VFile7z*) vf;
122	IAlloc_Free(&vf7z->vd->allocImp, vf7z->outBuffer);
123	File_Close(&vf7z->vd->archiveStream.file);
124	return true;
125}
126
127off_t _vf7zSeek(struct VFile* vf, off_t offset, int whence) {
128	struct VFile7z* vf7z = (struct VFile7z*) vf;
129
130	size_t position;
131	switch (whence) {
132	case SEEK_SET:
133		position = offset;
134		break;
135	case SEEK_CUR:
136		if (offset < 0 && ((vf7z->offset < (size_t) -offset) || (offset == INT_MIN))) {
137			return -1;
138		}
139		position = vf7z->offset + offset;
140		break;
141	case SEEK_END:
142		if (offset < 0 && ((vf7z->size < (size_t) -offset) || (offset == INT_MIN))) {
143			return -1;
144		}
145		position = vf7z->size + offset;
146		break;
147	default:
148		return -1;
149	}
150
151	if (position > vf7z->size) {
152		return -1;
153	}
154
155	vf7z->offset = position;
156	return position;
157}
158
159ssize_t _vf7zRead(struct VFile* vf, void* buffer, size_t size) {
160	struct VFile7z* vf7z = (struct VFile7z*) vf;
161
162	if (size + vf7z->offset >= vf7z->size) {
163		size = vf7z->size - vf7z->offset;
164	}
165
166	memcpy(buffer, vf7z->outBuffer + vf7z->offset + vf7z->bufferOffset, size);
167	vf7z->offset += size;
168	return size;
169}
170
171ssize_t _vf7zWrite(struct VFile* vf, const void* buffer, size_t size) {
172	// TODO
173	UNUSED(vf);
174	UNUSED(buffer);
175	UNUSED(size);
176	return -1;
177}
178
179void* _vf7zMap(struct VFile* vf, size_t size, int flags) {
180	struct VFile7z* vf7z = (struct VFile7z*) vf;
181
182	UNUSED(flags);
183	if (size > vf7z->size) {
184		return 0;
185	}
186
187	return vf7z->outBuffer + vf7z->bufferOffset;
188}
189
190void _vf7zUnmap(struct VFile* vf, void* memory, size_t size) {
191	UNUSED(vf);
192	UNUSED(memory);
193	UNUSED(size);
194}
195
196void _vf7zTruncate(struct VFile* vf, size_t size) {
197	// TODO
198	UNUSED(vf);
199	UNUSED(size);
200}
201
202ssize_t _vf7zSize(struct VFile* vf) {
203	struct VFile7z* vf7z = (struct VFile7z*) vf;
204	return vf7z->size;
205}
206
207bool _vd7zClose(struct VDir* vd) {
208	struct VDir7z* vd7z = (struct VDir7z*) vd;
209	SzArEx_Free(&vd7z->db, &vd7z->allocImp);
210	File_Close(&vd7z->archiveStream.file);
211
212	free(vd7z->dirent.utf8);
213	vd7z->dirent.utf8 = 0;
214
215	free(vd7z);
216	return true;
217}
218
219void _vd7zRewind(struct VDir* vd) {
220	struct VDir7z* vd7z = (struct VDir7z*) vd;
221	free(vd7z->dirent.utf8);
222	vd7z->dirent.utf8 = 0;
223	vd7z->dirent.index = -1;
224}
225
226struct VDirEntry* _vd7zListNext(struct VDir* vd) {
227	struct VDir7z* vd7z = (struct VDir7z*) vd;
228	if (vd7z->db.NumFiles <= vd7z->dirent.index + 1) {
229		return 0;
230	}
231	free(vd7z->dirent.utf8);
232	vd7z->dirent.utf8 = 0;
233	++vd7z->dirent.index;
234	return &vd7z->dirent.d;
235}
236
237struct VFile* _vd7zOpenFile(struct VDir* vd, const char* path, int mode) {
238	UNUSED(mode);
239	// TODO: support truncating, appending and creating, and write
240	struct VDir7z* vd7z = (struct VDir7z*) vd;
241
242	if ((mode & O_RDWR) == O_RDWR) {
243		// Read/Write support is not yet implemented.
244		return 0;
245	}
246
247	if (mode & O_WRONLY) {
248		// Write support is not yet implemented.
249		return 0;
250	}
251
252	size_t pathLength = strlen(path);
253
254	UInt32 i;
255	for (i = 0; i < vd7z->db.NumFiles; ++i) {
256		if (SzArEx_IsDir(&vd7z->db, i)) {
257			continue;
258		}
259		size_t nameLength = SzArEx_GetFileNameUtf16(&vd7z->db, i, 0) * sizeof(UInt16);
260		UInt16* name = malloc(nameLength);
261		SzArEx_GetFileNameUtf16(&vd7z->db, i, name);
262
263		if (utfcmp(name, path, nameLength - sizeof(UInt16), pathLength) == 0) {
264			free(name);
265			break;
266		}
267
268		free(name);
269	}
270
271	if (i == vd7z->db.NumFiles) {
272		return 0; // No file found
273	}
274
275	struct VFile7z* vf = malloc(sizeof(struct VFile7z));
276	vf->vd = vd7z;
277
278	size_t outBufferSize;
279	UInt32 blockIndex;
280
281	vf->outBuffer = 0;
282	SRes res = SzArEx_Extract(&vd7z->db, &vd7z->lookStream.s, i, &blockIndex,
283		&vf->outBuffer, &outBufferSize,
284		&vf->bufferOffset, &vf->size,
285		&vd7z->allocImp, &vd7z->allocTempImp);
286
287	if (res != SZ_OK) {
288		free(vf);
289		return 0;
290	}
291
292	vf->d.close = _vf7zClose;
293	vf->d.seek = _vf7zSeek;
294	vf->d.read = _vf7zRead;
295	vf->d.readline = VFileReadline;
296	vf->d.write = _vf7zWrite;
297	vf->d.map = _vf7zMap;
298	vf->d.unmap = _vf7zUnmap;
299	vf->d.truncate = _vf7zTruncate;
300	vf->d.size = _vf7zSize;
301	vf->d.sync = _vf7zSync;
302
303	return &vf->d;
304}
305
306struct VDir* _vd7zOpenDir(struct VDir* vd, const char* path) {
307	UNUSED(vd);
308	UNUSED(path);
309	return 0;
310}
311
312bool _vf7zSync(struct VFile* vf, const void* memory, size_t size) {
313	UNUSED(vf);
314	UNUSED(memory);
315	UNUSED(size);
316	return false;
317}
318
319const char* _vde7zName(struct VDirEntry* vde) {
320	struct VDirEntry7z* vde7z = (struct VDirEntry7z*) vde;
321	if (!vde7z->utf8) {
322		size_t nameLength = SzArEx_GetFileNameUtf16(&vde7z->vd->db, vde7z->index, 0) * sizeof(UInt16);
323		UInt16* name = malloc(nameLength);
324		SzArEx_GetFileNameUtf16(&vde7z->vd->db, vde7z->index, name);
325		vde7z->utf8 = utf16to8(name, nameLength - sizeof(UInt16));
326		free(name);
327	}
328
329	return vde7z->utf8;
330}
331
332static enum VFSType _vde7zType(struct VDirEntry* vde) {
333	struct VDirEntry7z* vde7z = (struct VDirEntry7z*) vde;
334	if (SzArEx_IsDir(&vde7z->vd->db, vde7z->index)) {
335		return VFS_DIRECTORY;
336	}
337	return VFS_FILE;
338}
339
340#endif