Add support for parsing zip archives.

Also add unit tests for test it.

1 files changed, 161 insertions, 0 deletions

diff --git a/src/fs/zip.cpp b/src/fs/zip.cpp
new file mode 100644
index 000000000..2164a4303
--- /dev/null
+++ b/src/fs/zip.cpp
@@ -0,0 +1,161 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2017  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "fs/zip.h"
+
+#include "fs/ziplocalheader.h"
+
+#include "utils/checkutils.h"
+#include "utils/stringutils.h"
+
+#include <iostream>
+#include <unistd.h>
+
+#include "debug.h"
+
+#define readVal(val, sz, msg) \
+    cnt = fread(static_cast<void*>(val), 1, sz, arcFile); \
+    if (cnt != sz) \
+    { \
+        reportAlways("Error reading " msg " in file %s", \
+            archiveName.c_str()); \
+        delete header; \
+        delete [] buf; \
+        fclose(arcFile); \
+        return false; \
+    } \
+
+namespace Zip
+{
+    bool readArchiveInfo(const std::string &restrict archiveName,
+                         std::vector<ZipLocalHeader*> &restrict headers)
+    {
+        FILE *restrict const arcFile = fopen(archiveName.c_str(),
+            "r");
+        if (arcFile == nullptr)
+        {
+            reportAlways("Can't open zip file %s",
+                archiveName.c_str());
+            return false;
+        }
+        size_t cnt = 0U;
+        uint8_t *const buf = new uint8_t[65535 + 10];
+        uint16_t val16 = 0U;
+        ZipLocalHeader *header = nullptr;
+
+        logger->log("Read archive: %s", archiveName.c_str());
+        // format source https://en.wikipedia.org/wiki/Zip_%28file_format%29
+        while (feof(arcFile) == 0)
+        {
+            // file header pointer on 0
+            // read file header signature
+            readVal(buf, 4, "zip file header");  // + 4
+            // pointer on 4
+
+            if (buf[0] == 0x50 &&
+                buf[1] == 0x4B &&
+                buf[2] == 0x03 &&
+                buf[3] == 0x04)
+            {   // local file header
+                header = new ZipLocalHeader;
+                header->archiveName = archiveName;
+                // skip useless fields
+                fseek(arcFile, 14, SEEK_CUR);  // + 14
+                // file header pointer on 18
+                readVal(&header->compressSize, 4,
+                    "zip compressed size") // + 4
+                // file header pointer on 22
+                // +++ need add endian specific decoding for val32
+                readVal(&header->uncompressSize, 4,
+                    "zip uncompressed size")  // + 4
+                // file header pointer on 26
+                // +++ need add endian specific decoding for val32
+                readVal(&val16, 2, "file name length")  // + 2
+                // file header pointer on 28
+                const uint32_t fileNameLen = CAST_U32(val16);
+                if (fileNameLen > 1000)
+                {
+                    reportAlways("Error too long file name in file %s",
+                        archiveName.c_str());
+                    delete header;
+                    delete [] buf;
+                    fclose(arcFile);
+                    return false;
+                }
+                readVal(&val16, 2, "extra field length")  // + 2
+                // file header pointer on 30
+                const uint32_t extraFieldLen = CAST_U32(val16);
+                readVal(buf, fileNameLen, "file name");
+                // file header pointer on 30 + fileNameLen
+                buf[fileNameLen] = 0;
+                header->fileName = std::string(
+                    reinterpret_cast<char*>(buf));
+                header->dataOffset = ftell(arcFile) + extraFieldLen;
+                fseek(arcFile, extraFieldLen + header->compressSize, SEEK_CUR);
+                // pointer on 30 + fileNameLen + extraFieldLen + compressSize
+                if (findLast(header->fileName, "/") == false)
+                {
+                    headers.push_back(header);
+                    logger->log(" file name: %s",
+                        header->fileName.c_str());
+                    logger->log(" compressed size: %u", header->compressSize);
+                    logger->log(" uncompressed size: %u", header->uncompressSize);
+                }
+            }
+            else if (buf[0] == 0x50 &&
+                     buf[1] == 0x4B &&
+                     buf[2] == 0x01 &&
+                     buf[3] == 0x02)
+            {   // central directory file header
+                // !!! This is quick way for read zip archives. !!!
+                // !!! It ignore modified files in archive. !!!
+                // ignoring central directory entries because all data already read.
+                break;
+            }
+            else if (buf[0] == 0x50 &&
+                     buf[1] == 0x4B &&
+                     buf[2] == 0x05 &&
+                     buf[3] == 0x06)
+            {   // end of central directory
+                // !!! This is quick way for read zip archives. !!!
+                // !!! It ignore modified files in archive. !!!
+                // ignoring central directory entries because all data already read.
+                break;
+            }
+            else
+            {
+                reportAlways("Error in header signature (0x%02x%02x%02x%02x)"
+                    " in file %s",
+                    buf[0],
+                    buf[1],
+                    buf[2],
+                    buf[3],
+                    archiveName.c_str());
+                delete [] buf;
+                fclose(arcFile);
+                return false;
+            }
+        }
+        delete [] buf;
+        fclose(arcFile);
+        return true;
+    }
+
+}  // namespace Zip