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);
 65
 66static const char* _vde7zName(struct VDirEntry* vde);
 67static enum VFSType _vde7zType(struct VDirEntry* vde);
 68
 69struct VDir* VDirOpen7z(const char* path, int flags) {
 70	if (flags & O_WRONLY || flags & O_CREAT) {
 71		return 0;
 72	}
 73
 74	struct VDir7z* vd = malloc(sizeof(struct VDir7z));
 75
 76	// What does any of this mean, Igor?
 77	if (InFile_Open(&vd->archiveStream.file, path)) {
 78		free(vd);
 79		return 0;
 80	}
 81
 82	vd->allocImp.Alloc = SzAlloc;
 83	vd->allocImp.Free = SzFree;
 84
 85	vd->allocTempImp.Alloc = SzAllocTemp;
 86	vd->allocTempImp.Free = SzFreeTemp;
 87
 88	FileInStream_CreateVTable(&vd->archiveStream);
 89	LookToRead_CreateVTable(&vd->lookStream, False);
 90
 91	vd->lookStream.realStream = &vd->archiveStream.s;
 92	LookToRead_Init(&vd->lookStream);
 93
 94	CrcGenerateTable();
 95
 96	SzArEx_Init(&vd->db);
 97	SRes res = SzArEx_Open(&vd->db, &vd->lookStream.s, &vd->allocImp, &vd->allocTempImp);
 98	if (res != SZ_OK) {
 99		File_Close(&vd->archiveStream.file);
100		free(vd);
101		return 0;
102	}
103
104	vd->dirent.index = 0;
105	vd->dirent.utf8 = 0;
106	vd->dirent.vd = vd;
107	vd->dirent.d.name = _vde7zName;
108	vd->dirent.d.type = _vde7zType;
109
110	vd->d.close = _vd7zClose;
111	vd->d.rewind = _vd7zRewind;
112	vd->d.listNext = _vd7zListNext;
113	vd->d.openFile = _vd7zOpenFile;
114
115	return &vd->d;
116}
117
118bool _vf7zClose(struct VFile* vf) {
119	struct VFile7z* vf7z = (struct VFile7z*) vf;
120	IAlloc_Free(&vf7z->vd->allocImp, vf7z->outBuffer);
121	File_Close(&vf7z->vd->archiveStream.file);
122	return true;
123}
124
125off_t _vf7zSeek(struct VFile* vf, off_t offset, int whence) {
126	struct VFile7z* vf7z = (struct VFile7z*) vf;
127
128	size_t position;
129	switch (whence) {
130	case SEEK_SET:
131		position = offset;
132		break;
133	case SEEK_CUR:
134		if (offset < 0 && ((vf7z->offset < (size_t) -offset) || (offset == INT_MIN))) {
135			return -1;
136		}
137		position = vf7z->offset + offset;
138		break;
139	case SEEK_END:
140		if (offset < 0 && ((vf7z->size < (size_t) -offset) || (offset == INT_MIN))) {
141			return -1;
142		}
143		position = vf7z->size + offset;
144		break;
145	default:
146		return -1;
147	}
148
149	if (position > vf7z->size) {
150		return -1;
151	}
152
153	vf7z->offset = position;
154	return position;
155}
156
157ssize_t _vf7zRead(struct VFile* vf, void* buffer, size_t size) {
158	struct VFile7z* vf7z = (struct VFile7z*) vf;
159
160	if (size + vf7z->offset >= vf7z->size) {
161		size = vf7z->size - vf7z->offset;
162	}
163
164	memcpy(buffer, vf7z->outBuffer + vf7z->offset + vf7z->bufferOffset, size);
165	vf7z->offset += size;
166	return size;
167}
168
169ssize_t _vf7zWrite(struct VFile* vf, const void* buffer, size_t size) {
170	// TODO
171	UNUSED(vf);
172	UNUSED(buffer);
173	UNUSED(size);
174	return -1;
175}
176
177void* _vf7zMap(struct VFile* vf, size_t size, int flags) {
178	struct VFile7z* vf7z = (struct VFile7z*) vf;
179
180	UNUSED(flags);
181	if (size > vf7z->size) {
182		return 0;
183	}
184
185	return vf7z->outBuffer + vf7z->bufferOffset;
186}
187
188void _vf7zUnmap(struct VFile* vf, void* memory, size_t size) {
189	UNUSED(vf);
190	UNUSED(memory);
191	UNUSED(size);
192}
193
194void _vf7zTruncate(struct VFile* vf, size_t size) {
195	// TODO
196	UNUSED(vf);
197	UNUSED(size);
198}
199
200ssize_t _vf7zSize(struct VFile* vf) {
201	struct VFile7z* vf7z = (struct VFile7z*) vf;
202	return vf7z->size;
203}
204
205bool _vd7zClose(struct VDir* vd) {
206	struct VDir7z* vd7z = (struct VDir7z*) vd;
207	SzArEx_Free(&vd7z->db, &vd7z->allocImp);
208	File_Close(&vd7z->archiveStream.file);
209
210	free(vd7z->dirent.utf8);
211	vd7z->dirent.utf8 = 0;
212
213	free(vd7z);
214	return true;
215}
216
217void _vd7zRewind(struct VDir* vd) {
218	struct VDir7z* vd7z = (struct VDir7z*) vd;
219	free(vd7z->dirent.utf8);
220	vd7z->dirent.utf8 = 0;
221	vd7z->dirent.index = -1;
222}
223
224struct VDirEntry* _vd7zListNext(struct VDir* vd) {
225	struct VDir7z* vd7z = (struct VDir7z*) vd;
226	if (vd7z->db.NumFiles <= vd7z->dirent.index + 1) {
227		return 0;
228	}
229	free(vd7z->dirent.utf8);
230	vd7z->dirent.utf8 = 0;
231	++vd7z->dirent.index;
232	return &vd7z->dirent.d;
233}
234
235struct VFile* _vd7zOpenFile(struct VDir* vd, const char* path, int mode) {
236	UNUSED(mode);
237	// TODO: support truncating, appending and creating, and write
238	struct VDir7z* vd7z = (struct VDir7z*) vd;
239
240	if ((mode & O_RDWR) == O_RDWR) {
241		// Read/Write support is not yet implemented.
242		return 0;
243	}
244
245	if (mode & O_WRONLY) {
246		// Write support is not yet implemented.
247		return 0;
248	}
249
250	size_t pathLength = strlen(path);
251
252	UInt32 i;
253	for (i = 0; i < vd7z->db.NumFiles; ++i) {
254		if (SzArEx_IsDir(&vd7z->db, i)) {
255			continue;
256		}
257		size_t nameLength = SzArEx_GetFileNameUtf16(&vd7z->db, i, 0) * sizeof(UInt16);
258		UInt16* name = malloc(nameLength);
259		SzArEx_GetFileNameUtf16(&vd7z->db, i, name);
260
261		if (utfcmp(name, path, nameLength - sizeof(UInt16), pathLength) == 0) {
262			free(name);
263			break;
264		}
265
266		free(name);
267	}
268
269	if (i == vd7z->db.NumFiles) {
270		return 0; // No file found
271	}
272
273	struct VFile7z* vf = malloc(sizeof(struct VFile7z));
274	vf->vd = vd7z;
275
276	size_t outBufferSize;
277	UInt32 blockIndex;
278
279	vf->outBuffer = 0;
280	SRes res = SzArEx_Extract(&vd7z->db, &vd7z->lookStream.s, i, &blockIndex,
281		&vf->outBuffer, &outBufferSize,
282		&vf->bufferOffset, &vf->size,
283		&vd7z->allocImp, &vd7z->allocTempImp);
284
285	if (res != SZ_OK) {
286		free(vf);
287		return 0;
288	}
289
290	vf->d.close = _vf7zClose;
291	vf->d.seek = _vf7zSeek;
292	vf->d.read = _vf7zRead;
293	vf->d.readline = VFileReadline;
294	vf->d.write = _vf7zWrite;
295	vf->d.map = _vf7zMap;
296	vf->d.unmap = _vf7zUnmap;
297	vf->d.truncate = _vf7zTruncate;
298	vf->d.size = _vf7zSize;
299	vf->d.sync = _vf7zSync;
300
301	return &vf->d;
302}
303
304bool _vf7zSync(struct VFile* vf, const void* memory, size_t size) {
305	UNUSED(vf);
306	UNUSED(memory);
307	UNUSED(size);
308	return false;
309}
310
311const char* _vde7zName(struct VDirEntry* vde) {
312	struct VDirEntry7z* vde7z = (struct VDirEntry7z*) vde;
313	if (!vde7z->utf8) {
314		size_t nameLength = SzArEx_GetFileNameUtf16(&vde7z->vd->db, vde7z->index, 0) * sizeof(UInt16);
315		UInt16* name = malloc(nameLength);
316		SzArEx_GetFileNameUtf16(&vde7z->vd->db, vde7z->index, name);
317		vde7z->utf8 = utf16to8(name, nameLength - sizeof(UInt16));
318		free(name);
319	}
320
321	return vde7z->utf8;
322}
323
324static enum VFSType _vde7zType(struct VDirEntry* vde) {
325	struct VDirEntry7z* vde7z = (struct VDirEntry7z*) vde;
326	if (SzArEx_IsDir(&vde7z->vd->db, vde7z->index)) {
327		return VFS_DIRECTORY;
328	}
329	return VFS_FILE;
330}
331
332#endif