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