3MF: add export to a given archive.

code/CMakeLists.txt

@@ -743,6 +743,14 @@ SET( unzip_SRCS
 )
 SOURCE_GROUP( unzip FILES ${unzip_SRCS})
 
+SET( ziplib_SRCS
+  ../contrib/zip/src/miniz.h
+  ../contrib/zip/src/zip.c
+  ../contrib/zip/src/zip.h
+)
+
+SOURCE_GROUP( ziplib FILES ${ziplib_SRCS} )
+
 SET ( openddl_parser_SRCS
   ../contrib/openddlparser/code/OpenDDLParser.cpp
   ../contrib/openddlparser/code/DDLNode.cpp
@@ -854,6 +862,7 @@ SET( assimp_src
   ${Clipper_SRCS}
   ${openddl_parser_SRCS}
   ${open3dgc_SRCS}
+  ${ziplib_SRCS}
   # Necessary to show the headers in the project when using the VC++ generator:
 
   ${PUBLIC_HEADERS}

code/D3MFExporter.cpp

@@ -50,12 +50,17 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "3MFXmlTags.h"
 #include "D3MFOpcPackage.h"
 
+#include <contrib/zip/src/zip.h>
+
 namespace Assimp {
 
 void ExportScene3MF( const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* /*pProperties*/ ) {
     D3MF::D3MFExporter myExporter( pFile, pIOSystem, pScene );
     if ( myExporter.validate() ) {
         bool ok = myExporter.exportArchive(pFile);
+        if ( !ok ) {
+            throw DeadlyExportError( "Could not export 3MP archive: " + std::string( pFile ) );
+        }
     }
 }
 
@@ -66,6 +71,7 @@ namespace D3MF {
 D3MFExporter::D3MFExporter( const char* pFile, IOSystem* pIOSystem, const aiScene* pScene )
 : mIOSystem( pIOSystem )
 , mArchiveName( pFile )
+, m_zipArchive( nullptr )
 , mScene( pScene )
 , mBuildItems()
 , mRelations() {
@@ -79,26 +85,6 @@ D3MFExporter::~D3MFExporter() {
     mRelations.clear();
 }
 
-bool D3MFExporter::createFileStructure( const char *file ) {
-    if ( !mIOSystem->CreateDirectory( file ) ) {
-        return false;
-    }
-
-    if ( !mIOSystem->ChangeDirectory( file ) ) {
-        return false;
-    }
-
-    if ( !mIOSystem->CreateDirectory( "3D" ) ) {
-        return false;
-    }
-
-    if ( !mIOSystem->CreateDirectory( "_rels" ) ) {
-        return false;
-    }
-
-    return true;
-}
-
 bool D3MFExporter::validate() {
     if ( mArchiveName.empty() ) {
         return false;
@@ -113,13 +99,14 @@ bool D3MFExporter::validate() {
 
 bool D3MFExporter::exportArchive( const char *file ) {
     bool ok( true );
-    ok |= createFileStructure( file );
+
+    m_zipArchive = zip_open( file, ZIP_DEFAULT_COMPRESSION_LEVEL, 'w' );
+    if ( nullptr == m_zipArchive ) {
+        return false;
+    }
     ok |= exportRelations();
     ok |= export3DModel();
 
-    if ( ok ) {
-        createZipArchiveFromeFileStructure();
-    }
     return ok;
 }
 
@@ -247,45 +234,21 @@ void D3MFExporter::writeBuild() {
 }
 
 void D3MFExporter::writeModelToArchive( const std::string &folder, const std::string &modelName ) {
-    const std::string &oldFolder( mIOSystem->CurrentDirectory() );
+    const std::string entry = folder + "/" + mArchiveName;
-    if ( folder != oldFolder ) {
+    zip_entry_open( m_zipArchive, entry.c_str() );
-        mIOSystem->PushDirectory( oldFolder );
-        mIOSystem->ChangeDirectory( folder );
 
-        const std::string &exportTxt( mOutput.str() );
+    const std::string &exportTxt( mOutput.str() );
-        std::shared_ptr<IOStream> outfile( mIOSystem->Open( modelName, "wb" ) );
+    zip_entry_write( m_zipArchive, exportTxt.c_str(), exportTxt.size() );
-        if ( !outfile ) {
-            throw DeadlyExportError( "Could not open output model file: " + std::string( modelName ) );
-        }
 
-        const size_t writtenBytes( outfile->Write( exportTxt.c_str(), sizeof( char ), exportTxt.size() ) );
+    zip_entry_close( m_zipArchive );
-
-        mIOSystem->ChangeDirectory( ".." );
-        mIOSystem->PopDirectory();
-    }
 }
 
 void D3MFExporter::writeRelInfoToFile( const std::string &folder, const std::string &relName ) {
-    const std::string &oldFolder( mIOSystem->CurrentDirectory() );
+    const std::string entry = folder + "/" + "_rels";
-    if ( folder != oldFolder ) {
+    zip_entry_open( m_zipArchive, entry.c_str() );
-        mIOSystem->PushDirectory( oldFolder );
+    const std::string &exportTxt( mOutput.str() );
-        mIOSystem->ChangeDirectory( folder );
+    zip_entry_write( m_zipArchive, exportTxt.c_str(), exportTxt.size() );
-
+    zip_entry_close( m_zipArchive );
-        const std::string &exportTxt( mOutput.str() );
-        std::shared_ptr<IOStream> outfile( mIOSystem->Open( relName, "wb" ) );
-        if ( !outfile ) {
-            throw DeadlyExportError( "Could not open output model file: " + std::string( relName ) );
-        }
-
-        const size_t writtenBytes( outfile->Write( exportTxt.c_str(), sizeof( char ), exportTxt.size() ) );
-
-        mIOSystem->ChangeDirectory( ".." );
-        mIOSystem->PopDirectory();
-    }
-}
-
-void D3MFExporter::createZipArchiveFromeFileStructure() {
-
 }
 
 #endif // ASSIMP_BUILD_NO3MF_EXPORTER

code/D3MFExporter.h

@@ -50,6 +50,8 @@ struct aiNode;
 struct aiMaterial;
 struct aiMesh;
 
+struct zip_t;
+
 namespace Assimp {
 
 class IOStream;
@@ -66,7 +68,6 @@ public:
     D3MFExporter( const char* pFile, IOSystem* pIOSystem, const aiScene* pScene );
     ~D3MFExporter();
     bool validate();
-    bool createFileStructure( const char *file );
     bool exportArchive( const char *file );
     bool exportRelations();
     bool export3DModel();
@@ -80,11 +81,12 @@ protected:
     void writeBuild();
     void writeModelToArchive( const std::string &folder, const std::string &modelName );
     void writeRelInfoToFile( const std::string &folder, const std::string &relName );
-    void createZipArchiveFromeFileStructure();
+    void createZipArchiveFromeFileStructure( const char* pFile );
 
 private:
     IOSystem *mIOSystem;
     std::string mArchiveName;
+    zip_t *m_zipArchive;
     const aiScene *mScene;
     std::ostringstream mOutput;
     std::vector<unsigned int> mBuildItems;

contrib/zip/.gitignore

@@ -0,0 +1,38 @@
+/build/
+/test/build/
+/xcodeproj/
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+*.suo
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Temporary
+*.swp
+.DS_Store

contrib/zip/.travis.yml

@@ -0,0 +1,10 @@
+language: c
+# Compiler selection
+compiler:
+  - clang
+  - gcc
+# Build steps
+script:
+  - mkdir build
+  - cd build
+  - cmake -DCMAKE_BUILD_TYPE=Debug .. && make && make test

contrib/zip/CMakeLists.txt

@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 2.8)
+project(zip)
+
+if (MSVC)
+    # Use secure functions by defaualt and suppress warnings about "deprecated" functions
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES=1")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT=1")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_NONSTDC_NO_WARNINGS=1 /D _CRT_SECURE_NO_WARNINGS=1")
+endif (MSVC)
+
+# zip
+set(SRC src/miniz.h src/zip.h src/zip.c)
+add_library(${CMAKE_PROJECT_NAME} ${SRC})
+
+# test
+enable_testing()
+add_subdirectory(test)
+

contrib/zip/README.md

@@ -0,0 +1,139 @@
+### A portable (OSX/Linux/Windows), simple zip library written in C
+This is done by hacking awesome [miniz](https://code.google.com/p/miniz) library and layering functions on top of the miniz v1.15 API.
+
+[![Windows][win-badge]][win-link] [![OS X][osx-linux-badge]][osx-linux-link]
+
+[win-badge]: https://img.shields.io/appveyor/ci/kuba--/zip/master.svg?label=windows "AppVeyor build status"
+[win-link]:  https://ci.appveyor.com/project/kuba--/zip "AppVeyor build status"
+[osx-linux-badge]: https://img.shields.io/travis/kuba--/zip/master.svg?label=linux/osx "Travis CI build status"
+[osx-linux-link]:  https://travis-ci.org/kuba--/zip "Travis CI build status"
+
+# The Idea
+<img src="zip.png" name="zip" />
+... Some day, I was looking for zip library written in C for my project, but I could not find anything simple enough and lightweight.
+Everything what I tried required 'crazy mental gymnastics' to integrate or had some limitations or was too heavy.
+I hate frameworks, factories and adding new dependencies. If I must to install all those dependencies and link new library, I'm getting almost sick.
+I wanted something powerfull and small enough, so I could add just a few files and compile them into my project.
+And finally I found miniz.
+Miniz is a lossless, high performance data compression library in a single source file. I only needed simple interface to append buffers or files to the current zip-entry. Thanks to this feature I'm able to merge many files/buffers and compress them on-the-fly.
+
+It was the reason, why I decided to write zip module on top of the miniz. It required a little bit hacking and wrapping some functions, but I kept simplicity. So, you can grab these 3 files and compile them into your project. I hope that interface is also extremely simple, so you will not have any problems to understand it.
+
+# Examples
+
+* Create a new zip archive with default compression level.
+```c
+    struct zip_t *zip = zip_open("foo.zip", ZIP_DEFAULT_COMPRESSION_LEVEL, 'w');
+    {
+        zip_entry_open(zip, "foo-1.txt");
+        {
+            char *buf = "Some data here...";
+            zip_entry_write(zip, buf, strlen(buf));
+        }
+        zip_entry_close(zip);
+
+        zip_entry_open(zip, "foo-2.txt");
+        {
+            // merge 3 files into one entry and compress them on-the-fly.
+            zip_entry_fwrite(zip, "foo-2.1.txt");
+            zip_entry_fwrite(zip, "foo-2.2.txt");
+            zip_entry_fwrite(zip, "foo-2.3.txt");
+        }
+        zip_entry_close(zip);
+    }
+    zip_close(zip);
+```
+
+* Append to the existing zip archive.
+```c
+    struct zip_t *zip = zip_open("foo.zip", ZIP_DEFAULT_COMPRESSION_LEVEL, 'a');
+    {
+        zip_entry_open(zip, "foo-3.txt");
+        {
+            char *buf = "Append some data here...";
+            zip_entry_write(zip, buf, strlen(buf));
+        }
+        zip_entry_close(zip);
+    }
+    zip_close(zip);
+```
+
+* Extract a zip archive into a folder.
+```c
+    int on_extract_entry(const char *filename, void *arg) {
+        static int i = 0;
+        int n = *(int *)arg;
+        printf("Extracted: %s (%d of %d)\n", filename, ++i, n);
+
+        return 0;
+    }
+
+    int arg = 2;
+    zip_extract("foo.zip", "/tmp", on_extract_entry, &arg);
+```
+
+* Extract a zip entry into memory.
+```c
+    void *buf = NULL;
+    size_t bufsize;
+
+    struct zip_t *zip = zip_open("foo.zip", 0, 'r');
+    {
+        zip_entry_open(zip, "foo-1.txt");
+        {
+            zip_entry_read(zip, &buf, &bufsize);
+        }
+        zip_entry_close(zip);
+    }
+    zip_close(zip);
+
+    free(buf);
+```
+
+* Extract a zip entry into memory using callback.
+```c
+    struct buffer_t {
+        char *data;
+        size_t size;
+    };
+
+    static size_t on_extract(void *arg, unsigned long long offset, const void *data, size_t size) {
+        struct buffer_t *buf = (struct buffer_t *)arg;
+        buf->data = realloc(buf->data, buf->size + size + 1);
+        assert(NULL != buf->data);
+
+        memcpy(&(buf->data[buf->size]), data, size);
+        buf->size += size;
+        buf->data[buf->size] = 0;
+
+        return size;
+    }
+
+    struct buffer_t buf = {0};
+    struct zip_t *zip = zip_open("foo.zip", 0, 'r');
+    {
+        zip_entry_open(zip, "foo-1.txt");
+        {
+            zip_entry_extract(zip, on_extract, &buf);
+        }
+        zip_entry_close(zip);
+    }
+    zip_close(zip);
+
+    free(buf.data);
+```
+
+
+* Extract a zip entry into a file.
+```c
+    struct zip_t *zip = zip_open("foo.zip", 0, 'r');
+    {
+        zip_entry_open(zip, "foo-2.txt");
+        {
+            zip_entry_fread(zip, "foo-2.txt");
+        }
+        zip_entry_close(zip);
+    }
+    zip_close(zip);
+```
+

contrib/zip/UNLICENSE

@@ -0,0 +1,26 @@
+/*
+  This is free and unencumbered software released into the public domain.
+
+  Anyone is free to copy, modify, publish, use, compile, sell, or
+  distribute this software, either in source code form or as a compiled
+  binary, for any purpose, commercial or non-commercial, and by any
+  means.
+
+  In jurisdictions that recognize copyright laws, the author or authors
+  of this software dedicate any and all copyright interest in the
+  software to the public domain. We make this dedication for the benefit
+  of the public at large and to the detriment of our heirs and
+  successors. We intend this dedication to be an overt act of
+  relinquishment in perpetuity of all present and future rights to this
+  software under copyright law.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+  OTHER DEALINGS IN THE SOFTWARE.
+
+  For more information, please refer to <http://unlicense.org/>
+*/

contrib/zip/appveyor.yml

@@ -0,0 +1,14 @@
+version: 1.0.{build}
+build_script:
+- cmd: >-
+    cd c:\projects\zip
+
+    mkdir build
+
+    cd build
+
+    cmake -G"Visual Studio 14" -DCMAKE_BUILD_TYPE=Debug ..
+
+    cmake --build . --config %CMAKE_BUILD_TYPE%
+
+    ctest --verbose -C "Debug"

contrib/zip/src/zip.c

@@ -0,0 +1,640 @@
+/*
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "zip.h"
+#include "miniz.h"
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#if defined _WIN32 || defined __WIN32__
+/* Win32, DOS */
+#include <direct.h>
+
+#define MKDIR(DIRNAME) _mkdir(DIRNAME)
+#define STRCLONE(STR) ((STR) ? _strdup(STR) : NULL)
+#define HAS_DEVICE(P)                                                          \
+    ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) && \
+     (P)[1] == ':')
+#define FILESYSTEM_PREFIX_LEN(P) (HAS_DEVICE(P) ? 2 : 0)
+#define ISSLASH(C) ((C) == '/' || (C) == '\\')
+
+#else
+#define MKDIR(DIRNAME) mkdir(DIRNAME, 0755)
+#define STRCLONE(STR) ((STR) ? strdup(STR) : NULL)
+#endif
+
+#ifndef FILESYSTEM_PREFIX_LEN
+#define FILESYSTEM_PREFIX_LEN(P) 0
+#endif
+
+#ifndef ISSLASH
+#define ISSLASH(C) ((C) == '/')
+#endif
+
+#define CLEANUP(ptr)           \
+    do {                       \
+        if (ptr) {             \
+            free((void *)ptr); \
+            ptr = NULL;        \
+        }                      \
+    } while (0)
+
+static char *basename(const char *name) {
+    char const *p;
+    char const *base = name += FILESYSTEM_PREFIX_LEN(name);
+    int all_slashes = 1;
+
+    for (p = name; *p; p++) {
+        if (ISSLASH(*p))
+            base = p + 1;
+        else
+            all_slashes = 0;
+    }
+
+    /* If NAME is all slashes, arrange to return `/'. */
+    if (*base == '\0' && ISSLASH(*name) && all_slashes) --base;
+
+    return (char *)base;
+}
+
+static int mkpath(const char *path) {
+    char const *p;
+    char npath[MAX_PATH + 1] = {0};
+    int len = 0;
+
+    for (p = path; *p && len < MAX_PATH; p++) {
+        if (ISSLASH(*p) && len > 0) {
+            if (MKDIR(npath) == -1)
+                if (errno != EEXIST) return -1;
+        }
+        npath[len++] = *p;
+    }
+
+    return 0;
+}
+
+static char *strrpl(const char *str, char oldchar, char newchar) {
+    char *rpl = (char *)malloc(sizeof(char) * (1 + strlen(str)));
+    char *begin = rpl;
+    char c;
+    while((c = *str++)) {
+        if (c == oldchar) {
+            c = newchar;
+        }
+        *rpl++ = c;
+    }
+    *rpl = '\0';
+
+    return begin;
+}
+
+struct zip_entry_t {
+    int index;
+    const char *name;
+    mz_uint64 uncomp_size;
+    mz_uint64 comp_size;
+    mz_uint32 uncomp_crc32;
+    mz_uint64 offset;
+    mz_uint8 header[MZ_ZIP_LOCAL_DIR_HEADER_SIZE];
+    mz_uint64 header_offset;
+    mz_uint16 method;
+    mz_zip_writer_add_state state;
+    tdefl_compressor comp;
+};
+
+struct zip_t {
+    mz_zip_archive archive;
+    mz_uint level;
+    struct zip_entry_t entry;
+    char mode;
+};
+
+struct zip_t *zip_open(const char *zipname, int level, char mode) {
+    struct zip_t *zip = NULL;
+
+    if (!zipname || strlen(zipname) < 1) {
+        // zip_t archive name is empty or NULL
+        goto cleanup;
+    }
+
+    if (level < 0) level = MZ_DEFAULT_LEVEL;
+    if ((level & 0xF) > MZ_UBER_COMPRESSION) {
+        // Wrong compression level
+        goto cleanup;
+    }
+
+    zip = (struct zip_t *)calloc((size_t)1, sizeof(struct zip_t));
+    if (!zip) goto cleanup;
+
+    zip->level = level;
+    zip->mode = mode;
+    switch (mode) {
+        case 'w':
+            // Create a new archive.
+            if (!mz_zip_writer_init_file(&(zip->archive), zipname, 0)) {
+                // Cannot initialize zip_archive writer
+                goto cleanup;
+            }
+            break;
+
+        case 'r':
+        case 'a':
+            if (!mz_zip_reader_init_file(
+                    &(zip->archive), zipname,
+                    level | MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY)) {
+                // An archive file does not exist or cannot initialize
+                // zip_archive reader
+                goto cleanup;
+            }
+
+            if (mode == 'a' &&
+                !mz_zip_writer_init_from_reader(&(zip->archive), zipname)) {
+                mz_zip_reader_end(&(zip->archive));
+                goto cleanup;
+            }
+
+            break;
+
+        default:
+            goto cleanup;
+    }
+
+    return zip;
+
+cleanup:
+    CLEANUP(zip);
+    return NULL;
+}
+
+void zip_close(struct zip_t *zip) {
+    if (zip) {
+        // Always finalize, even if adding failed for some reason, so we have a
+        // valid central directory.
+        mz_zip_writer_finalize_archive(&(zip->archive));
+
+        mz_zip_writer_end(&(zip->archive));
+        mz_zip_reader_end(&(zip->archive));
+
+        CLEANUP(zip);
+    }
+}
+
+int zip_entry_open(struct zip_t *zip, const char *entryname) {
+    char *locname = NULL;
+    size_t entrylen = 0;
+    mz_zip_archive *pzip = NULL;
+    mz_uint num_alignment_padding_bytes, level;
+
+    if (!zip || !entryname) {
+        return -1;
+    }
+
+    entrylen = strlen(entryname);
+    if (entrylen < 1) {
+        return -1;
+    }
+
+    pzip = &(zip->archive);
+    /*
+      .ZIP File Format Specification Version: 6.3.3
+
+      4.4.17.1 The name of the file, with optional relative path.
+      The path stored MUST not contain a drive or
+      device letter, or a leading slash.  All slashes
+      MUST be forward slashes '/' as opposed to
+      backwards slashes '\' for compatibility with Amiga
+      and UNIX file systems etc.  If input came from standard
+      input, there is no file name field.
+    */
+    locname = strrpl(entryname, '\\', '/');
+
+    if (zip->mode == 'r') {
+        zip->entry.index = mz_zip_reader_locate_file(pzip, locname, NULL, 0);
+        CLEANUP(locname);
+        return (zip->entry.index < 0) ? -1 : 0;
+    }
+
+    zip->entry.index = zip->archive.m_total_files;
+    zip->entry.name = locname;
+    if (!zip->entry.name) {
+        // Cannot parse zip entry name
+        return -1;
+    }
+
+    zip->entry.comp_size = 0;
+    zip->entry.uncomp_size = 0;
+    zip->entry.uncomp_crc32 = MZ_CRC32_INIT;
+    zip->entry.offset = zip->archive.m_archive_size;
+    zip->entry.header_offset = zip->archive.m_archive_size;
+    memset(zip->entry.header, 0,
+           MZ_ZIP_LOCAL_DIR_HEADER_SIZE * sizeof(mz_uint8));
+    zip->entry.method = 0;
+
+    num_alignment_padding_bytes =
+        mz_zip_writer_compute_padding_needed_for_file_alignment(pzip);
+
+    if (!pzip->m_pState || (pzip->m_zip_mode != MZ_ZIP_MODE_WRITING)) {
+        // Wrong zip mode
+        return -1;
+    }
+    if (zip->level & MZ_ZIP_FLAG_COMPRESSED_DATA) {
+        // Wrong zip compression level
+        return -1;
+    }
+    // no zip64 support yet
+    if ((pzip->m_total_files == 0xFFFF) ||
+        ((pzip->m_archive_size + num_alignment_padding_bytes +
+          MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE +
+          entrylen) > 0xFFFFFFFF)) {
+        // No zip64 support yet
+        return -1;
+    }
+    if (!mz_zip_writer_write_zeros(
+            pzip, zip->entry.offset,
+            num_alignment_padding_bytes + sizeof(zip->entry.header))) {
+        // Cannot memset zip entry header
+        return -1;
+    }
+
+    zip->entry.header_offset += num_alignment_padding_bytes;
+    if (pzip->m_file_offset_alignment) {
+        MZ_ASSERT((zip->entry.header_offset &
+                   (pzip->m_file_offset_alignment - 1)) == 0);
+    }
+    zip->entry.offset +=
+        num_alignment_padding_bytes + sizeof(zip->entry.header);
+
+    if (pzip->m_pWrite(pzip->m_pIO_opaque, zip->entry.offset, zip->entry.name,
+                       entrylen) != entrylen) {
+        // Cannot write data to zip entry
+        return -1;
+    }
+
+    zip->entry.offset += entrylen;
+    level = zip->level & 0xF;
+    if (level) {
+        zip->entry.state.m_pZip = pzip;
+        zip->entry.state.m_cur_archive_file_ofs = zip->entry.offset;
+        zip->entry.state.m_comp_size = 0;
+
+        if (tdefl_init(&(zip->entry.comp), mz_zip_writer_add_put_buf_callback,
+                       &(zip->entry.state),
+                       tdefl_create_comp_flags_from_zip_params(
+                           level, -15, MZ_DEFAULT_STRATEGY)) !=
+            TDEFL_STATUS_OKAY) {
+            // Cannot initialize the zip compressor
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+int zip_entry_close(struct zip_t *zip) {
+    mz_zip_archive *pzip = NULL;
+    mz_uint level;
+    tdefl_status done;
+    mz_uint16 entrylen;
+    time_t t;
+    struct tm *tm;
+    mz_uint16 dos_time, dos_date;
+    int status = -1;
+
+    if (!zip) {
+        // zip_t handler is not initialized
+        return -1;
+    }
+
+    if (zip->mode == 'r') {
+        return 0;
+    }
+
+    pzip = &(zip->archive);
+    level = zip->level & 0xF;
+    if (level) {
+        done = tdefl_compress_buffer(&(zip->entry.comp), "", 0, TDEFL_FINISH);
+        if (done != TDEFL_STATUS_DONE && done != TDEFL_STATUS_OKAY) {
+            // Cannot flush compressed buffer
+            goto cleanup;
+        }
+        zip->entry.comp_size = zip->entry.state.m_comp_size;
+        zip->entry.offset = zip->entry.state.m_cur_archive_file_ofs;
+        zip->entry.method = MZ_DEFLATED;
+    }
+
+    entrylen = (mz_uint16)strlen(zip->entry.name);
+    t = time(NULL);
+    tm = localtime(&t);
+    dos_time = (mz_uint16)(((tm->tm_hour) << 11) + ((tm->tm_min) << 5) +
+                           ((tm->tm_sec) >> 1));
+    dos_date = (mz_uint16)(((tm->tm_year + 1900 - 1980) << 9) +
+                           ((tm->tm_mon + 1) << 5) + tm->tm_mday);
+
+    // no zip64 support yet
+    if ((zip->entry.comp_size > 0xFFFFFFFF) ||
+        (zip->entry.offset > 0xFFFFFFFF)) {
+        // No zip64 support, yet
+        goto cleanup;
+    }
+
+    if (!mz_zip_writer_create_local_dir_header(
+            pzip, zip->entry.header, entrylen, 0, zip->entry.uncomp_size,
+            zip->entry.comp_size, zip->entry.uncomp_crc32, zip->entry.method, 0,
+            dos_time, dos_date)) {
+        // Cannot create zip entry header
+        goto cleanup;
+    }
+
+    if (pzip->m_pWrite(pzip->m_pIO_opaque, zip->entry.header_offset,
+                       zip->entry.header, sizeof(zip->entry.header)) !=
+        sizeof(zip->entry.header)) {
+        // Cannot write zip entry header
+        goto cleanup;
+    }
+
+    if (!mz_zip_writer_add_to_central_dir(
+            pzip, zip->entry.name, entrylen, NULL, 0, "", 0,
+            zip->entry.uncomp_size, zip->entry.comp_size,
+            zip->entry.uncomp_crc32, zip->entry.method, 0, dos_time, dos_date,
+            zip->entry.header_offset, 0)) {
+        // Cannot write to zip central dir
+        goto cleanup;
+    }
+
+    pzip->m_total_files++;
+    pzip->m_archive_size = zip->entry.offset;
+    status = 0;
+
+cleanup:
+    CLEANUP(zip->entry.name);
+    return status;
+}
+
+int zip_entry_write(struct zip_t *zip, const void *buf, size_t bufsize) {
+    mz_uint level;
+    mz_zip_archive *pzip = NULL;
+    tdefl_status status;
+
+    if (!zip) {
+        // zip_t handler is not initialized
+        return -1;
+    }
+
+    pzip = &(zip->archive);
+    if (buf && bufsize > 0) {
+        zip->entry.uncomp_size += bufsize;
+        zip->entry.uncomp_crc32 = (mz_uint32)mz_crc32(
+            zip->entry.uncomp_crc32, (const mz_uint8 *)buf, bufsize);
+
+        level = zip->level & 0xF;
+        if (!level) {
+            if ((pzip->m_pWrite(pzip->m_pIO_opaque, zip->entry.offset, buf,
+                                bufsize) != bufsize)) {
+                // Cannot write buffer
+                return -1;
+            }
+            zip->entry.offset += bufsize;
+            zip->entry.comp_size += bufsize;
+        } else {
+            status = tdefl_compress_buffer(&(zip->entry.comp), buf, bufsize,
+                                           TDEFL_NO_FLUSH);
+            if (status != TDEFL_STATUS_DONE && status != TDEFL_STATUS_OKAY) {
+                // Cannot compress buffer
+                return -1;
+            }
+        }
+    }
+
+    return 0;
+}
+
+int zip_entry_fwrite(struct zip_t *zip, const char *filename) {
+    int status = 0;
+    size_t n = 0;
+    FILE *stream = NULL;
+    mz_uint8 buf[MZ_ZIP_MAX_IO_BUF_SIZE] = {0};
+
+    if (!zip) {
+        // zip_t handler is not initialized
+        return -1;
+    }
+
+    stream = fopen(filename, "rb");
+    if (!stream) {
+        // Cannot open filename
+        return -1;
+    }
+
+    while ((n = fread(buf, sizeof(mz_uint8), MZ_ZIP_MAX_IO_BUF_SIZE, stream)) >
+           0) {
+        if (zip_entry_write(zip, buf, n) < 0) {
+            status = -1;
+            break;
+        }
+    }
+    fclose(stream);
+
+    return status;
+}
+
+int zip_entry_read(struct zip_t *zip, void **buf, size_t *bufsize) {
+    mz_zip_archive *pzip = NULL;
+    mz_uint idx;
+
+    if (!zip) {
+        // zip_t handler is not initialized
+        return -1;
+    }
+
+    if (zip->mode != 'r' || zip->entry.index < 0) {
+        // the entry is not found or we do not have read access
+        return -1;
+    }
+
+    pzip = &(zip->archive);
+    idx = (mz_uint)zip->entry.index;
+    if (mz_zip_reader_is_file_a_directory(pzip, idx)) {
+        // the entry is a directory
+        return -1;
+    }
+
+    *buf = mz_zip_reader_extract_to_heap(pzip, idx, bufsize, 0);
+    return (*buf) ? 0 : -1;
+}
+
+int zip_entry_fread(struct zip_t *zip, const char *filename) {
+    mz_zip_archive *pzip = NULL;
+    mz_uint idx;
+
+    if (!zip) {
+        // zip_t handler is not initialized
+        return -1;
+    }
+
+    if (zip->mode != 'r' || zip->entry.index < 0) {
+        // the entry is not found or we do not have read access
+        return -1;
+    }
+
+    pzip = &(zip->archive);
+    idx = (mz_uint)zip->entry.index;
+    if (mz_zip_reader_is_file_a_directory(pzip, idx)) {
+        // the entry is a directory
+        return -1;
+    }
+
+    return (mz_zip_reader_extract_to_file(pzip, idx, filename, 0)) ? 0 : -1;
+}
+
+int zip_entry_extract(struct zip_t *zip,
+                      size_t (*on_extract)(void *arg, unsigned long long offset,
+                                           const void *buf, size_t bufsize),
+                      void *arg) {
+    mz_zip_archive *pzip = NULL;
+    mz_uint idx;
+
+    if (!zip) {
+        // zip_t handler is not initialized
+        return -1;
+    }
+
+    if (zip->mode != 'r' || zip->entry.index < 0) {
+        // the entry is not found or we do not have read access
+        return -1;
+    }
+
+    pzip = &(zip->archive);
+    idx = (mz_uint)zip->entry.index;
+
+    return (mz_zip_reader_extract_to_callback(pzip, idx, on_extract, arg, 0))
+               ? 0
+               : -1;
+}
+
+int zip_create(const char *zipname, const char *filenames[], size_t len) {
+    int status = 0;
+    size_t i;
+    mz_zip_archive zip_archive;
+
+    if (!zipname || strlen(zipname) < 1) {
+        // zip_t archive name is empty or NULL
+        return -1;
+    }
+
+    // Create a new archive.
+    if (!memset(&(zip_archive), 0, sizeof(zip_archive))) {
+        // Cannot memset zip archive
+        return -1;
+    }
+
+    if (!mz_zip_writer_init_file(&zip_archive, zipname, 0)) {
+        // Cannot initialize zip_archive writer
+        return -1;
+    }
+
+    for (i = 0; i < len; ++i) {
+        const char *name = filenames[i];
+        if (!name) {
+            status = -1;
+            break;
+        }
+
+        if (!mz_zip_writer_add_file(&zip_archive, basename(name), name, "", 0,
+                                    ZIP_DEFAULT_COMPRESSION_LEVEL)) {
+            // Cannot add file to zip_archive
+            status = -1;
+            break;
+        }
+    }
+
+    mz_zip_writer_finalize_archive(&zip_archive);
+    mz_zip_writer_end(&zip_archive);
+    return status;
+}
+
+int zip_extract(const char *zipname, const char *dir,
+                int (*on_extract)(const char *filename, void *arg), void *arg) {
+    int status = -1;
+    mz_uint i, n;
+    char path[MAX_PATH + 1] = {0};
+    mz_zip_archive zip_archive;
+    mz_zip_archive_file_stat info;
+    size_t dirlen = 0;
+
+    if (!memset(&(zip_archive), 0, sizeof(zip_archive))) {
+        // Cannot memset zip archive
+        return -1;
+    }
+
+    if (!zipname || !dir) {
+        // Cannot parse zip archive name
+        return -1;
+    }
+
+    dirlen = strlen(dir);
+    if (dirlen + 1 > MAX_PATH) {
+        return -1;
+    }
+
+    // Now try to open the archive.
+    if (!mz_zip_reader_init_file(&zip_archive, zipname, 0)) {
+        // Cannot initialize zip_archive reader
+        return -1;
+    }
+
+    strcpy(path, dir);
+    if (!ISSLASH(path[dirlen - 1])) {
+#if defined _WIN32 || defined __WIN32__
+        path[dirlen] = '\\';
+#else
+        path[dirlen] = '/';
+#endif
+        ++dirlen;
+    }
+
+    // Get and print information about each file in the archive.
+    n = mz_zip_reader_get_num_files(&zip_archive);
+    for (i = 0; i < n; ++i) {
+        if (!mz_zip_reader_file_stat(&zip_archive, i, &info)) {
+            // Cannot get information about zip archive;
+            goto out;
+        }
+        strncpy(&path[dirlen], info.m_filename, MAX_PATH - dirlen);
+        if (mkpath(path) < 0) {
+            // Cannot make a path
+            goto out;
+        }
+
+        if (!mz_zip_reader_is_file_a_directory(&zip_archive, i)) {
+            if (!mz_zip_reader_extract_to_file(&zip_archive, i, path, 0)) {
+                // Cannot extract zip archive to file
+                goto out;
+            }
+        }
+
+        if (on_extract) {
+            if (on_extract(path, arg) < 0) {
+                goto out;
+            }
+        }
+    }
+    status = 0;
+
+out:
+    // Close the archive, freeing any resources it was using
+    if (!mz_zip_reader_end(&zip_archive)) {
+        // Cannot end zip reader
+        status = -1;
+    }
+
+    return status;
+}

contrib/zip/src/zip.h

@@ -0,0 +1,193 @@
+/*
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+#ifndef ZIP_H
+#define ZIP_H
+
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef MAX_PATH
+#define MAX_PATH 32767 /* # chars in a path name including NULL */
+#endif
+
+#define ZIP_DEFAULT_COMPRESSION_LEVEL 6
+
+/*
+  This data structure is used throughout the library to represent zip archive
+  - forward declaration.
+*/
+struct zip_t;
+
+/*
+  Opens zip archive with compression level using the given mode.
+
+  Args:
+    zipname: zip archive file name.
+    level: compression level (0-9 are the standard zlib-style levels).
+    mode: file access mode.
+        'r': opens a file for reading/extracting (the file must exists).
+        'w': creates an empty file for writing.
+        'a': appends to an existing archive.
+
+  Returns:
+    The zip archive handler or NULL on error
+*/
+extern struct zip_t *zip_open(const char *zipname, int level, char mode);
+
+/*
+  Closes zip archive, releases resources - always finalize.
+
+  Args:
+    zip: zip archive handler.
+*/
+extern void zip_close(struct zip_t *zip);
+
+/*
+  Opens a new entry for writing in a zip archive.
+
+  Args:
+    zip: zip archive handler.
+    entryname: an entry name in local dictionary.
+
+  Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+*/
+extern int zip_entry_open(struct zip_t *zip, const char *entryname);
+
+/*
+  Closes a zip entry, flushes buffer and releases resources.
+
+  Args:
+    zip: zip archive handler.
+
+  Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+*/
+extern int zip_entry_close(struct zip_t *zip);
+
+/*
+  Compresses an input buffer for the current zip entry.
+
+  Args:
+    zip: zip archive handler.
+    buf: input buffer.
+    bufsize: input buffer size (in bytes).
+
+  Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+*/
+extern int zip_entry_write(struct zip_t *zip, const void *buf, size_t bufsize);
+
+/*
+  Compresses a file for the current zip entry.
+
+  Args:
+    zip: zip archive handler.
+    filename: input file.
+
+  Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+*/
+extern int zip_entry_fwrite(struct zip_t *zip, const char *filename);
+
+/*
+  Extracts the current zip entry into output buffer.
+  The function allocates sufficient memory for a output buffer.
+
+  Args:
+    zip: zip archive handler.
+    buf: output buffer.
+    bufsize: output buffer size (in bytes).
+
+  Note:
+    - remember to release memory allocated for a output buffer.
+    - for large entries, please take a look at zip_entry_extract function.
+
+  Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+*/
+extern int zip_entry_read(struct zip_t *zip, void **buf, size_t *bufsize);
+
+/*
+  Extracts the current zip entry into output file.
+
+  Args:
+    zip: zip archive handler.
+    filename: output file.
+
+  Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+*/
+extern int zip_entry_fread(struct zip_t *zip, const char *filename);
+
+/*
+   Extract the current zip entry using a callback function (on_extract).
+
+   Args:
+    zip: zip archive handler.
+    on_extract: callback function.
+    arg: opaque pointer (optional argument,
+                         which you can pass to the on_extract callback)
+
+   Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+ */
+extern int zip_entry_extract(struct zip_t *zip,
+                             size_t (*on_extract)(void *arg,
+                                                  unsigned long long offset,
+                                                  const void *data,
+                                                  size_t size),
+                             void *arg);
+
+/*
+  Creates a new archive and puts files into a single zip archive.
+
+  Args:
+    zipname: zip archive file.
+    filenames: input files.
+    len: number of input files.
+
+  Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+*/
+extern int zip_create(const char *zipname, const char *filenames[], size_t len);
+
+/*
+  Extracts a zip archive file into directory.
+
+  If on_extract_entry is not NULL, the callback will be called after
+  successfully extracted each zip entry.
+  Returning a negative value from the callback will cause abort and return an
+  error. The last argument (void *arg) is optional, which you can use to pass
+  data to the on_extract_entry callback.
+
+  Args:
+    zipname: zip archive file.
+    dir: output directory.
+    on_extract_entry: on extract callback.
+    arg: opaque pointer.
+
+  Returns:
+    The return code - 0 on success, negative number (< 0) on error.
+*/
+extern int zip_extract(const char *zipname, const char *dir,
+                       int (*on_extract_entry)(const char *filename, void *arg),
+                       void *arg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

contrib/zip/test/CMakeLists.txt

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 2.8)
+
+# test
+include_directories(../src)
+add_executable(test.exe test.c ../src/zip.c)
+
+add_test(NAME test COMMAND test.exe)

contrib/zip/test/test.c

@@ -0,0 +1,105 @@
+#include <zip.h>
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define ZIPNAME "test.zip"
+#define TESTDATA1 "Some test data 1...\0"
+#define TESTDATA2 "Some test data 2...\0"
+
+static void test_write(void) {
+    struct zip_t *zip = zip_open(ZIPNAME, ZIP_DEFAULT_COMPRESSION_LEVEL, 'w');
+    assert(zip != NULL);
+
+    assert(0 == zip_entry_open(zip, "test/test-1.txt"));
+    assert(0 == zip_entry_write(zip, TESTDATA1, strlen(TESTDATA1)));
+    assert(0 == zip_entry_close(zip));
+
+    zip_close(zip);
+}
+
+static void test_append(void) {
+    struct zip_t *zip = zip_open(ZIPNAME, ZIP_DEFAULT_COMPRESSION_LEVEL, 'a');
+    assert(zip != NULL);
+
+    assert(0 == zip_entry_open(zip, "test\\test-2.txt"));
+    assert(0 == zip_entry_write(zip, TESTDATA2, strlen(TESTDATA2)));
+    assert(0 == zip_entry_close(zip));
+
+    zip_close(zip);
+}
+
+static void test_read(void) {
+    char *buf = NULL;
+    size_t bufsize;
+    struct zip_t *zip = zip_open(ZIPNAME, 0, 'r');
+    assert(zip != NULL);
+
+    assert(0 == zip_entry_open(zip, "test\\test-1.txt"));
+    assert(0 == zip_entry_read(zip, (void **)&buf, &bufsize));
+    assert(bufsize == strlen(TESTDATA1));
+    assert(0 == strncmp(buf, TESTDATA1, bufsize));
+    assert(0 == zip_entry_close(zip));
+    free(buf);
+    buf = NULL;
+    bufsize = 0;
+
+    assert(0 == zip_entry_open(zip, "test/test-2.txt"));
+    assert(0 == zip_entry_read(zip, (void **)&buf, &bufsize));
+    assert(bufsize == strlen(TESTDATA2));
+    assert(0 == strncmp(buf, TESTDATA2, bufsize));
+    assert(0 == zip_entry_close(zip));
+    free(buf);
+    buf = NULL;
+    bufsize = 0;
+
+    zip_close(zip);
+}
+
+struct buffer_t {
+    char *data;
+    size_t size;
+};
+
+static size_t on_extract(void *arg, unsigned long long offset, const void *data,
+                         size_t size) {
+    struct buffer_t *buf = (struct buffer_t *)arg;
+    buf->data = realloc(buf->data, buf->size + size + 1);
+    assert(NULL != buf->data);
+
+    memcpy(&(buf->data[buf->size]), data, size);
+    buf->size += size;
+    buf->data[buf->size] = 0;
+
+    return size;
+}
+
+static void test_extract(void) {
+    struct buffer_t buf = {0};
+
+    struct zip_t *zip = zip_open(ZIPNAME, 0, 'r');
+    assert(zip != NULL);
+
+    assert(0 == zip_entry_open(zip, "test/test-1.txt"));
+    assert(0 == zip_entry_extract(zip, on_extract, &buf));
+
+    assert(buf.size == strlen(TESTDATA1));
+    assert(0 == strncmp(buf.data, TESTDATA1, buf.size));
+    assert(0 == zip_entry_close(zip));
+    free(buf.data);
+    buf.data = NULL;
+    buf.size = 0;
+
+    zip_close(zip);
+}
+
+int main(int argc, char *argv[]) {
+    test_write();
+    test_append();
+    test_read();
+    test_extract();
+
+    return remove(ZIPNAME);
+}