1 files changed, 367 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_source_compress.c b/src/Common/libzip/zip_source_compress.c
new file mode 100644
index 00000000..a1ac3e03
--- /dev/null
+++ b/src/Common/libzip/zip_source_compress.c
@@ -0,0 +1,367 @@
+/*
+  zip_source_compress.c -- (de)compression routines
+  Copyright (C) 2017 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <libzip@nih.at>
+
+  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 <limits.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "zipint.h"
+
+struct context {
+    zip_error_t error;
+
+    bool end_of_input;
+    bool end_of_stream;
+    bool can_store;
+    bool is_stored; /* only valid if end_of_stream is true */
+    bool compress;
+    zip_int32_t method;
+
+    zip_uint64_t size;
+    zip_int64_t first_read;
+    zip_uint8_t buffer[BUFSIZE];
+
+    zip_compression_algorithm_t *algorithm;
+    void *ud;
+};
+
+
+struct implementation {
+    zip_uint16_t method;
+    zip_compression_algorithm_t *compress;
+    zip_compression_algorithm_t *decompress;
+};
+
+static struct implementation implementations[] = {
+    {ZIP_CM_DEFLATE, &zip_algorithm_deflate_compress, &zip_algorithm_deflate_decompress},
+#if defined(HAVE_LIBBZ2)
+    {ZIP_CM_BZIP2, &zip_algorithm_bzip2_compress, &zip_algorithm_bzip2_decompress},
+#endif
+};
+
+static size_t implementations_size = sizeof(implementations) / sizeof(implementations[0]);
+
+static zip_source_t *compression_source_new(zip_t *za, zip_source_t *src, zip_int32_t method, bool compress, int compression_flags);
+static zip_int64_t compress_callback(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t);
+static void context_free(struct context *ctx);
+static struct context *context_new(zip_int32_t method, bool compress, int compression_flags, zip_compression_algorithm_t *algorithm);
+static zip_int64_t compress_read(zip_source_t *, struct context *, void *, zip_uint64_t);
+
+static zip_compression_algorithm_t *
+get_algorithm(zip_int32_t method, bool compress) {
+    size_t i;
+    zip_uint16_t real_method = ZIP_CM_ACTUAL(method);
+
+    for (i = 0; i < implementations_size; i++) {
+	if (implementations[i].method == real_method) {
+	    if (compress) {
+		return implementations[i].compress;
+	    }
+	    else {
+		return implementations[i].decompress;
+	    }
+	}
+    }
+
+    return NULL;
+}
+
+bool
+zip_compression_method_supported(zip_int32_t method, bool compress) {
+    if (method == ZIP_CM_STORE) {
+	return true;
+    }
+    return get_algorithm(method, compress) != NULL;
+}
+
+zip_source_t *
+zip_source_compress(zip_t *za, zip_source_t *src, zip_int32_t method, int compression_flags) {
+    return compression_source_new(za, src, method, true, compression_flags);
+}
+
+zip_source_t *
+zip_source_decompress(zip_t *za, zip_source_t *src, zip_int32_t method) {
+    return compression_source_new(za, src, method, false, 0);
+}
+
+
+static zip_source_t *
+compression_source_new(zip_t *za, zip_source_t *src, zip_int32_t method, bool compress, int compression_flags) {
+    struct context *ctx;
+    zip_source_t *s2;
+    zip_compression_algorithm_t *algorithm = NULL;
+
+    if (src == NULL) {
+	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
+	return NULL;
+    }
+
+    if ((algorithm = get_algorithm(method, compress)) == NULL) {
+	zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
+	return NULL;
+    }
+
+    if ((ctx = context_new(method, compress, compression_flags, algorithm)) == NULL) {
+	zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
+	return NULL;
+    }
+
+    if ((s2 = zip_source_layered(za, src, compress_callback, ctx)) == NULL) {
+	context_free(ctx);
+	return NULL;
+    }
+
+    return s2;
+}
+
+
+static struct context *
+context_new(zip_int32_t method, bool compress, int compression_flags, zip_compression_algorithm_t *algorithm) {
+    struct context *ctx;
+
+    if ((ctx = (struct context *)malloc(sizeof(*ctx))) == NULL) {
+	return NULL;
+    }
+    zip_error_init(&ctx->error);
+    ctx->can_store = compress ? ZIP_CM_IS_DEFAULT(method) : false;
+    ctx->algorithm = algorithm;
+    ctx->method = method;
+    ctx->compress = compress;
+    ctx->end_of_input = false;
+    ctx->end_of_stream = false;
+    ctx->is_stored = false;
+
+    if ((ctx->ud = ctx->algorithm->allocate(ZIP_CM_ACTUAL(method), compression_flags, &ctx->error)) == NULL) {
+	zip_error_fini(&ctx->error);
+	free(ctx);
+	return NULL;
+    }
+
+    return ctx;
+}
+
+
+static void
+context_free(struct context *ctx) {
+    if (ctx == NULL) {
+	return;
+    }
+
+    ctx->algorithm->deallocate(ctx->ud);
+    zip_error_fini(&ctx->error);
+
+    free(ctx);
+}
+
+
+static zip_int64_t
+compress_read(zip_source_t *src, struct context *ctx, void *data, zip_uint64_t len) {
+    zip_compression_status_t ret;
+    bool end;
+    zip_int64_t n;
+    zip_uint64_t out_offset;
+    zip_uint64_t out_len;
+
+    if (zip_error_code_zip(&ctx->error) != ZIP_ER_OK) {
+	return -1;
+    }
+
+    if (len == 0 || ctx->end_of_stream) {
+	return 0;
+    }
+
+    out_offset = 0;
+
+    end = false;
+    while (!end && out_offset < len) {
+	out_len = len - out_offset;
+	ret = ctx->algorithm->process(ctx->ud, (zip_uint8_t *)data + out_offset, &out_len);
+
+	if (ret != ZIP_COMPRESSION_ERROR) {
+	    out_offset += out_len;
+	}
+
+	switch (ret) {
+	case ZIP_COMPRESSION_END:
+	    ctx->end_of_stream = true;
+
+	    if (!ctx->end_of_input) {
+		/* TODO: garbage after stream, or compression ended before all data read */
+	    }
+
+	    if (ctx->first_read < 0) {
+		/* we got end of processed stream before reading any input data */
+		zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
+		end = true;
+		break;
+	    }
+	    if (ctx->can_store && (zip_uint64_t)ctx->first_read <= out_offset) {
+		ctx->is_stored = true;
+		ctx->size = (zip_uint64_t)ctx->first_read;
+		memcpy(data, ctx->buffer, ctx->size);
+		return (zip_int64_t)ctx->size;
+	    }
+	    end = true;
+	    break;
+
+	case ZIP_COMPRESSION_OK:
+	    break;
+
+	case ZIP_COMPRESSION_NEED_DATA:
+	    if (ctx->end_of_input) {
+		/* TODO: error: stream not ended, but no more input */
+		end = true;
+		break;
+	    }
+
+	    if ((n = zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) {
+		_zip_error_set_from_source(&ctx->error, src);
+		end = true;
+		break;
+	    }
+	    else if (n == 0) {
+		ctx->end_of_input = true;
+		ctx->algorithm->end_of_input(ctx->ud);
+		if (ctx->first_read < 0) {
+		    ctx->first_read = 0;
+		}
+	    }
+	    else {
+		if (ctx->first_read >= 0) {
+		    /* we overwrote a previously filled ctx->buffer */
+		    ctx->can_store = false;
+		}
+		else {
+		    ctx->first_read = n;
+		}
+
+		ctx->algorithm->input(ctx->ud, ctx->buffer, (zip_uint64_t)n);
+	    }
+	    break;
+
+	case ZIP_COMPRESSION_ERROR:
+	    /* error set by algorithm */
+	    if (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) {
+		zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
+	    }
+	    end = true;
+	    break;
+	}
+    }
+
+    if (out_offset > 0) {
+	ctx->can_store = false;
+	ctx->size += out_offset;
+	return (zip_int64_t)out_offset;
+    }
+
+    return (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) ? 0 : -1;
+}
+
+
+static zip_int64_t
+compress_callback(zip_source_t *src, void *ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd) {
+    struct context *ctx;
+
+    ctx = (struct context *)ud;
+
+    switch (cmd) {
+    case ZIP_SOURCE_OPEN:
+	ctx->size = 0;
+	ctx->end_of_input = false;
+	ctx->end_of_stream = false;
+	ctx->is_stored = false;
+	ctx->first_read = -1;
+
+	if (!ctx->algorithm->start(ctx->ud)) {
+	    return -1;
+	}
+
+	return 0;
+
+    case ZIP_SOURCE_READ:
+	return compress_read(src, ctx, data, len);
+
+    case ZIP_SOURCE_CLOSE:
+	if (!ctx->algorithm->end(ctx->ud)) {
+	    return -1;
+	}
+	return 0;
+
+    case ZIP_SOURCE_STAT: {
+	zip_stat_t *st;
+
+	st = (zip_stat_t *)data;
+
+	if (ctx->compress) {
+	    if (ctx->end_of_stream) {
+		st->comp_method = ctx->is_stored ? ZIP_CM_STORE : ZIP_CM_ACTUAL(ctx->method);
+		st->comp_size = ctx->size;
+		st->valid |= ZIP_STAT_COMP_SIZE | ZIP_STAT_COMP_METHOD;
+	    }
+	    else {
+		st->valid &= ~(ZIP_STAT_COMP_SIZE | ZIP_STAT_COMP_METHOD);
+	    }
+	}
+	else {
+	    st->comp_method = ZIP_CM_STORE;
+	    st->valid |= ZIP_STAT_COMP_METHOD;
+	    if (ctx->end_of_stream) {
+		st->size = ctx->size;
+		st->valid |= ZIP_STAT_SIZE;
+	    }
+	    else {
+		st->valid &= ~ZIP_STAT_SIZE;
+	    }
+	}
+    }
+	return 0;
+
+    case ZIP_SOURCE_GET_COMPRESSION_FLAGS:
+	return ctx->is_stored ? 0 : ctx->algorithm->compression_flags(ctx->ud);
+
+    case ZIP_SOURCE_ERROR:
+	return zip_error_to_data(&ctx->error, data, len);
+
+    case ZIP_SOURCE_FREE:
+	context_free(ctx);
+	return 0;
+
+    case ZIP_SOURCE_SUPPORTS:
+	return ZIP_SOURCE_SUPPORTS_READABLE | zip_source_make_command_bitmap(ZIP_SOURCE_GET_COMPRESSION_FLAGS, -1);
+
+    default:
+	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
+	return -1;
+    }
+}