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