1 files changed, 276 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_algorithm_deflate.c b/src/Common/libzip/zip_algorithm_deflate.c
new file mode 100644
index 00000000..3c85e204
--- /dev/null
+++ b/src/Common/libzip/zip_algorithm_deflate.c
@@ -0,0 +1,276 @@
+/*
+  zip_algorithm_deflate.c -- deflate (de)compression routines
+  Copyright (C) 2017-2021 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <info@libzip.org>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+     the documentation and/or other materials provided with the
+     distribution.
+  3. The names of the authors may not be used to endorse or promote
+     products derived from this software without specific prior
+     written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "zipint.h"
+
+#include <limits.h>
+#include <stdlib.h>
+#include <zlib.h>
+
+struct ctx {
+    zip_error_t *error;
+    bool compress;
+    int level;
+    int mem_level;
+    bool end_of_input;
+    z_stream zstr;
+};
+
+
+static zip_uint64_t
+maximum_compressed_size(zip_uint64_t uncompressed_size) {
+    /* max deflate size increase: size + ceil(size/16k)*5+6 */
+
+    zip_uint64_t compressed_size = uncompressed_size + (uncompressed_size + 16383) / 16384 * 5 + 6;
+
+    if (compressed_size < uncompressed_size) {
+        return ZIP_UINT64_MAX;
+    }
+    return compressed_size;
+}
+
+
+static void *
+allocate(bool compress, zip_uint32_t compression_flags, zip_error_t *error) {
+    struct ctx *ctx;
+
+    if ((ctx = (struct ctx *)malloc(sizeof(*ctx))) == NULL) {
+        zip_error_set(error, ZIP_ET_SYS, errno);
+        return NULL;
+    }
+
+    ctx->error = error;
+    ctx->compress = compress;
+    if (compression_flags >= 1 && compression_flags <= 9) {
+        ctx->level = (int)compression_flags;
+    }
+    else {
+        ctx->level = Z_BEST_COMPRESSION;
+    }
+    ctx->mem_level = compression_flags == TORRENTZIP_COMPRESSION_FLAGS ? TORRENTZIP_MEM_LEVEL : MAX_MEM_LEVEL;
+    ctx->end_of_input = false;
+
+    ctx->zstr.zalloc = Z_NULL;
+    ctx->zstr.zfree = Z_NULL;
+    ctx->zstr.opaque = NULL;
+
+    return ctx;
+}
+
+
+static void *
+compress_allocate(zip_uint16_t method, zip_uint32_t compression_flags, zip_error_t *error) {
+    (void)method;
+    return allocate(true, compression_flags, error);
+}
+
+
+static void *
+decompress_allocate(zip_uint16_t method, zip_uint32_t compression_flags, zip_error_t *error) {
+    (void)method;
+    return allocate(false, compression_flags, error);
+}
+
+
+static void
+deallocate(void *ud) {
+    struct ctx *ctx = (struct ctx *)ud;
+
+    free(ctx);
+}
+
+
+static zip_uint16_t
+general_purpose_bit_flags(void *ud) {
+    struct ctx *ctx = (struct ctx *)ud;
+
+    if (!ctx->compress) {
+        return 0;
+    }
+
+    if (ctx->level < 3) {
+        return 2 << 1;
+    }
+    else if (ctx->level > 7) {
+        return 1 << 1;
+    }
+    return 0;
+}
+
+
+static bool
+start(void *ud, zip_stat_t *st, zip_file_attributes_t *attributes) {
+    struct ctx *ctx = (struct ctx *)ud;
+    int ret;
+
+    (void)st;
+    (void)attributes;
+
+    ctx->zstr.avail_in = 0;
+    ctx->zstr.next_in = NULL;
+    ctx->zstr.avail_out = 0;
+    ctx->zstr.next_out = NULL;
+
+    if (ctx->compress) {
+        /* negative value to tell zlib not to write a header */
+        ret = deflateInit2(&ctx->zstr, ctx->level, Z_DEFLATED, -MAX_WBITS, ctx->mem_level, Z_DEFAULT_STRATEGY);
+    }
+    else {
+        ret = inflateInit2(&ctx->zstr, -MAX_WBITS);
+    }
+
+    if (ret != Z_OK) {
+        zip_error_set(ctx->error, ZIP_ER_ZLIB, ret);
+        return false;
+    }
+
+
+    return true;
+}
+
+
+static bool
+end(void *ud) {
+    struct ctx *ctx = (struct ctx *)ud;
+    int err;
+
+    if (ctx->compress) {
+        err = deflateEnd(&ctx->zstr);
+    }
+    else {
+        err = inflateEnd(&ctx->zstr);
+    }
+
+    if (err != Z_OK) {
+        zip_error_set(ctx->error, ZIP_ER_ZLIB, err);
+        return false;
+    }
+
+    return true;
+}
+
+
+static bool
+input(void *ud, zip_uint8_t *data, zip_uint64_t length) {
+    struct ctx *ctx = (struct ctx *)ud;
+
+    if (length > UINT_MAX || ctx->zstr.avail_in > 0) {
+        zip_error_set(ctx->error, ZIP_ER_INVAL, 0);
+        return false;
+    }
+
+    ctx->zstr.avail_in = (uInt)length;
+    ctx->zstr.next_in = (Bytef *)data;
+
+    return true;
+}
+
+
+static void
+end_of_input(void *ud) {
+    struct ctx *ctx = (struct ctx *)ud;
+
+    ctx->end_of_input = true;
+}
+
+
+static zip_compression_status_t
+process(void *ud, zip_uint8_t *data, zip_uint64_t *length) {
+    struct ctx *ctx = (struct ctx *)ud;
+    uInt avail_out;
+
+    int ret;
+
+    avail_out = (uInt)ZIP_MIN(UINT_MAX, *length);
+    ctx->zstr.avail_out = avail_out;
+    ctx->zstr.next_out = (Bytef *)data;
+
+    if (ctx->compress) {
+        ret = deflate(&ctx->zstr, ctx->end_of_input ? Z_FINISH : 0);
+    }
+    else {
+        ret = inflate(&ctx->zstr, Z_SYNC_FLUSH);
+    }
+
+    *length = avail_out - ctx->zstr.avail_out;
+
+    switch (ret) {
+    case Z_OK:
+        return ZIP_COMPRESSION_OK;
+
+    case Z_STREAM_END:
+        return ZIP_COMPRESSION_END;
+
+    case Z_BUF_ERROR:
+        if (ctx->zstr.avail_in == 0) {
+            return ZIP_COMPRESSION_NEED_DATA;
+        }
+
+        /* fallthrough */
+
+    default:
+        zip_error_set(ctx->error, ZIP_ER_ZLIB, ret);
+        return ZIP_COMPRESSION_ERROR;
+    }
+}
+
+/* clang-format off */
+
+zip_compression_algorithm_t zip_algorithm_deflate_compress = {
+    maximum_compressed_size,
+    compress_allocate,
+    deallocate,
+    general_purpose_bit_flags,
+    20,
+    start,
+    end,
+    input,
+    end_of_input,
+    process
+};
+
+
+zip_compression_algorithm_t zip_algorithm_deflate_decompress = {
+    maximum_compressed_size,
+    decompress_allocate,
+    deallocate,
+    general_purpose_bit_flags,
+    20,
+    start,
+    end,
+    input,
+    end_of_input,
+    process
+};
+
+/* clang-format on */