/src/libzip/lib/zip_source_compress.c

Source
/*
  zip_source_compress.c -- (de)compression routines
  Copyright (C) 2017-2023 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 <stdlib.h>
#include <string.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;
    bool check_consistency;
    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
#if defined(HAVE_LIBLZMA)
    {ZIP_CM_LZMA, &zip_algorithm_xz_compress, &zip_algorithm_xz_decompress},
    /*  Disabled - because 7z isn't able to unpack ZIP+LZMA2
        archives made this way - and vice versa.

        {ZIP_CM_LZMA2, &zip_algorithm_xz_compress, &zip_algorithm_xz_decompress},
    */
    {ZIP_CM_XZ, &zip_algorithm_xz_compress, &zip_algorithm_xz_decompress},
#endif
#if defined(HAVE_LIBZSTD)
    {ZIP_CM_ZSTD, &zip_algorithm_zstd_compress, &zip_algorithm_zstd_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, zip_uint32_t 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, zip_uint32_t compression_flags, zip_compression_algorithm_t *algorithm, bool check_consistency);
static zip_int64_t compress_read(zip_source_t *, struct context *, void *, zip_uint64_t);

zip_compression_algorithm_t *_zip_get_compression_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;
}

ZIP_EXTERN int zip_compression_method_supported(zip_int32_t method, int compress) {
    if (method == ZIP_CM_STORE) {
        return 1;
    }
    return _zip_get_compression_algorithm(method, compress) != NULL;
}

zip_source_t *zip_source_compress(zip_t *za, zip_source_t *src, zip_int32_t method, zip_uint32_t 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, zip_uint32_t 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 = _zip_get_compression_algorithm(method, compress)) == NULL) {
        zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
        return NULL;
    }

    if ((ctx = context_new(method, compress, compression_flags, algorithm, za->open_flags & ZIP_CHECKCONS)) == 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, zip_uint32_t compression_flags, zip_compression_algorithm_t *algorithm, bool check_consistency) {
    struct context *ctx;

    if ((ctx = (struct context *)malloc(sizeof(*ctx))) == NULL) {
        return NULL;
    }
    zip_error_init(&ctx->error);
    ctx->can_store = compress ? method == ZIP_CM_DEFAULT : false;
    ctx->algorithm = algorithm;
    ctx->method = method;
    ctx->compress = compress;
    ctx->end_of_input = false;
    ctx->end_of_stream = false;
    ctx->is_stored = false;
    ctx->check_consistency = check_consistency;

    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) {
                n = zip_source_read(src, ctx->buffer, 1);
                if (n < 0) {
                    zip_error_set_from_source(&ctx->error, src);
                    end = true;
                    break;
                }
                else if (n == 0) {
                    ctx->end_of_input = true;
                    n = ctx->algorithm->end_of_input(ctx->ud) ? 1 : 0;
                }

                if (n > 0 && ctx->check_consistency) {
                    /* garbage after stream, or compression ended before all data read */
                    zip_error_set(&ctx->error, ZIP_ER_INCONS, ZIP_ER_DETAIL_COMPRESSED_DATA_TRAILING_GARBAGE);
                    end = true;
                    break;
                }
            }

            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;
                (void)memcpy_s(data, ctx->size, 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: {
        zip_stat_t st;
        zip_file_attributes_t attributes;
        
        ctx->size = 0;
        ctx->end_of_input = false;
        ctx->end_of_stream = false;
        ctx->is_stored = false;
        ctx->first_read = -1;
        
        if (zip_source_stat(src, &st) < 0 || zip_source_get_file_attributes(src, &attributes) < 0) {
            zip_error_set_from_source(&ctx->error, src);
            return -1;
        }

        if (!ctx->algorithm->start(ctx->ud, &st, &attributes)) {
            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;
            st->valid &= ~ZIP_STAT_COMP_SIZE;
            if (ctx->end_of_stream) {
                st->size = ctx->size;
                st->valid |= ZIP_STAT_SIZE;
            }
        }
    }
        return 0;

    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_GET_FILE_ATTRIBUTES: {
        zip_file_attributes_t *attributes = (zip_file_attributes_t *)data;

        if (len < sizeof(*attributes)) {
            zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
            return -1;
        }

        attributes->valid |= ZIP_FILE_ATTRIBUTES_VERSION_NEEDED | ZIP_FILE_ATTRIBUTES_GENERAL_PURPOSE_BIT_FLAGS;
        attributes->version_needed = ctx->algorithm->version_needed;
        attributes->general_purpose_bit_mask = ZIP_FILE_ATTRIBUTES_GENERAL_PURPOSE_BIT_FLAGS_ALLOWED_MASK;
        attributes->general_purpose_bit_flags = (ctx->is_stored ? 0 : ctx->algorithm->general_purpose_bit_flags(ctx->ud));

        return sizeof(*attributes);
    }

    case ZIP_SOURCE_SUPPORTS:
        return ZIP_SOURCE_SUPPORTS_READABLE | zip_source_make_command_bitmap(ZIP_SOURCE_GET_FILE_ATTRIBUTES, ZIP_SOURCE_SUPPORTS_REOPEN, -1);

    default:
        return zip_source_pass_to_lower_layer(src, data, len, cmd);
    }
}

Coverage Report

Created: 2025-12-03 06:06

Line	Count	Source
1		/*
2		zip_source_compress.c -- (de)compression routines
3		Copyright (C) 2017-2023 Dieter Baron and Thomas Klausner
4
5		This file is part of libzip, a library to manipulate ZIP archives.
6		The authors can be contacted at <info@libzip.org>
7
8		Redistribution and use in source and binary forms, with or without
9		modification, are permitted provided that the following conditions
10		are met:
11		1. Redistributions of source code must retain the above copyright
12		notice, this list of conditions and the following disclaimer.
13		2. Redistributions in binary form must reproduce the above copyright
14		notice, this list of conditions and the following disclaimer in
15		the documentation and/or other materials provided with the
16		distribution.
17		3. The names of the authors may not be used to endorse or promote
18		products derived from this software without specific prior
19		written permission.
20
21		THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22		OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23		WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24		ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25		DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26		DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27		GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28		INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29		IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30		OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31		IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32		*/
33
34		#include "zipint.h"
35
36		#include <stdlib.h>
37		#include <string.h>
38
39		struct context {
40		zip_error_t error;
41
42		bool end_of_input;
43		bool end_of_stream;
44		bool can_store;
45		bool is_stored; /* only valid if end_of_stream is true */
46		bool compress;
47		bool check_consistency;
48		zip_int32_t method;
49
50		zip_uint64_t size;
51		zip_int64_t first_read;
52		zip_uint8_t buffer[BUFSIZE];
53
54		zip_compression_algorithm_t *algorithm;
55		void *ud;
56		};
57
58
59		struct implementation {
60		zip_uint16_t method;
61		zip_compression_algorithm_t *compress;
62		zip_compression_algorithm_t *decompress;
63		};
64
65		static struct implementation implementations[] = {
66		{ZIP_CM_DEFLATE, &zip_algorithm_deflate_compress, &zip_algorithm_deflate_decompress},
67		#if defined(HAVE_LIBBZ2)
68		{ZIP_CM_BZIP2, &zip_algorithm_bzip2_compress, &zip_algorithm_bzip2_decompress},
69		#endif
70		#if defined(HAVE_LIBLZMA)
71		{ZIP_CM_LZMA, &zip_algorithm_xz_compress, &zip_algorithm_xz_decompress},
72		/* Disabled - because 7z isn't able to unpack ZIP+LZMA2
73		archives made this way - and vice versa.
74
75		{ZIP_CM_LZMA2, &zip_algorithm_xz_compress, &zip_algorithm_xz_decompress},
76		*/
77		{ZIP_CM_XZ, &zip_algorithm_xz_compress, &zip_algorithm_xz_decompress},
78		#endif
79		#if defined(HAVE_LIBZSTD)
80		{ZIP_CM_ZSTD, &zip_algorithm_zstd_compress, &zip_algorithm_zstd_decompress},
81		#endif
82
83		};
84
85		static size_t implementations_size = sizeof(implementations) / sizeof(implementations[0]);
86
87		static zip_source_t compression_source_new(zip_t za, zip_source_t *src, zip_int32_t method, bool compress, zip_uint32_t compression_flags);
88		static zip_int64_t compress_callback(zip_source_t , void , void *, zip_uint64_t, zip_source_cmd_t);
89		static void context_free(struct context *ctx);
90		static struct context context_new(zip_int32_t method, bool compress, zip_uint32_t compression_flags, zip_compression_algorithm_t algorithm, bool check_consistency);
91		static zip_int64_t compress_read(zip_source_t , struct context , void *, zip_uint64_t);
92
93	43.4k	zip_compression_algorithm_t *_zip_get_compression_algorithm(zip_int32_t method, bool compress) {
94	43.4k	size_t i;
95	43.4k	zip_uint16_t real_method = ZIP_CM_ACTUAL(method);
96
97	108k	for (i = 0; i < implementations_size; i++) {
98	102k	if (implementations[i].method == real_method) {
99	38.0k	if (compress) {
100	1.89k	return implementations[i].compress;
101	1.89k	}
102	36.1k	else {
103	36.1k	return implementations[i].decompress;
104	36.1k	}
105	38.0k	}
106	102k	}
107
108	5.35k	return NULL;
109	43.4k	}
110
111	0	ZIP_EXTERN int zip_compression_method_supported(zip_int32_t method, int compress) {
112	0	if (method == ZIP_CM_STORE) {
113	0	return 1;
114	0	}
115	0	return _zip_get_compression_algorithm(method, compress) != NULL;
116	0	}
117
118	947	zip_source_t zip_source_compress(zip_t za, zip_source_t *src, zip_int32_t method, zip_uint32_t compression_flags) {
119	947	return compression_source_new(za, src, method, true, compression_flags);
120	947	}
121
122		zip_source_t *
123	41.5k	zip_source_decompress(zip_t za, zip_source_t src, zip_int32_t method) {
124	41.5k	return compression_source_new(za, src, method, false, 0);
125	41.5k	}
126
127
128	42.4k	static zip_source_t compression_source_new(zip_t za, zip_source_t *src, zip_int32_t method, bool compress, zip_uint32_t compression_flags) {
129	42.4k	struct context *ctx;
130	42.4k	zip_source_t *s2;
131	42.4k	zip_compression_algorithm_t *algorithm = NULL;
132
133	42.4k	if (src == NULL) {
134	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
135	0	return NULL;
136	0	}
137
138	42.4k	if ((algorithm = _zip_get_compression_algorithm(method, compress)) == NULL) {
139	5.35k	zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
140	5.35k	return NULL;
141	5.35k	}
142
143	37.1k	if ((ctx = context_new(method, compress, compression_flags, algorithm, za->open_flags & ZIP_CHECKCONS)) == NULL) {
144	0	zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
145	0	return NULL;
146	0	}
147
148	37.1k	if ((s2 = zip_source_layered(za, src, compress_callback, ctx)) == NULL) {
149	0	context_free(ctx);
150	0	return NULL;
151	0	}
152
153	37.1k	return s2;
154	37.1k	}
155
156
157	37.1k	static struct context context_new(zip_int32_t method, bool compress, zip_uint32_t compression_flags, zip_compression_algorithm_t algorithm, bool check_consistency) {
158	37.1k	struct context *ctx;
159
160	37.1k	if ((ctx = (struct context )malloc(sizeof(ctx))) == NULL) {
161	0	return NULL;
162	0	}
163	37.1k	zip_error_init(&ctx->error);
164	37.1k	ctx->can_store = compress ? method == ZIP_CM_DEFAULT : false;
165	37.1k	ctx->algorithm = algorithm;
166	37.1k	ctx->method = method;
167	37.1k	ctx->compress = compress;
168	37.1k	ctx->end_of_input = false;
169	37.1k	ctx->end_of_stream = false;
170	37.1k	ctx->is_stored = false;
171	37.1k	ctx->check_consistency = check_consistency;
172
173	37.1k	if ((ctx->ud = ctx->algorithm->allocate(ZIP_CM_ACTUAL(method), compression_flags, &ctx->error)) == NULL) {
174	0	zip_error_fini(&ctx->error);
175	0	free(ctx);
176	0	return NULL;
177	0	}
178
179	37.1k	return ctx;
180	37.1k	}
181
182
183		static void
184	37.1k	context_free(struct context *ctx) {
185	37.1k	if (ctx == NULL) {
186	0	return;
187	0	}
188
189	37.1k	ctx->algorithm->deallocate(ctx->ud);
190	37.1k	zip_error_fini(&ctx->error);
191
192	37.1k	free(ctx);
193	37.1k	}
194
195
196		static zip_int64_t
197	65.0k	compress_read(zip_source_t src, struct context ctx, void *data, zip_uint64_t len) {
198	65.0k	zip_compression_status_t ret;
199	65.0k	bool end;
200	65.0k	zip_int64_t n;
201	65.0k	zip_uint64_t out_offset;
202	65.0k	zip_uint64_t out_len;
203
204	65.0k	if (zip_error_code_zip(&ctx->error) != ZIP_ER_OK) {
205	1.05k	return -1;
206	1.05k	}
207
208	63.9k	if (len == 0 \|\| ctx->end_of_stream) {
209	3.18k	return 0;
210	3.18k	}
211
212	60.8k	out_offset = 0;
213
214	60.8k	end = false;
215	219k	while (!end && out_offset < len) {
216	159k	out_len = len - out_offset;
217	159k	ret = ctx->algorithm->process(ctx->ud, (zip_uint8_t *)data + out_offset, &out_len);
218
219	159k	if (ret != ZIP_COMPRESSION_ERROR) {
220	146k	out_offset += out_len;
221	146k	}
222
223	159k	switch (ret) {
224	5.21k	case ZIP_COMPRESSION_END:
225	5.21k	ctx->end_of_stream = true;
226
227	5.21k	if (!ctx->end_of_input) {
228	4.26k	n = zip_source_read(src, ctx->buffer, 1);
229	4.26k	if (n < 0) {
230	966	zip_error_set_from_source(&ctx->error, src);
231	966	end = true;
232	966	break;
233	966	}
234	3.29k	else if (n == 0) {
235	2.78k	ctx->end_of_input = true;
236	2.78k	n = ctx->algorithm->end_of_input(ctx->ud) ? 1 : 0;
237	2.78k	}
238
239	3.29k	if (n > 0 && ctx->check_consistency) {
240		/* garbage after stream, or compression ended before all data read */
241	0	zip_error_set(&ctx->error, ZIP_ER_INCONS, ZIP_ER_DETAIL_COMPRESSED_DATA_TRAILING_GARBAGE);
242	0	end = true;
243	0	break;
244	0	}
245	3.29k	}
246
247	4.24k	if (ctx->first_read < 0) {
248		/* we got end of processed stream before reading any input data */
249	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
250	0	end = true;
251	0	break;
252	0	}
253	4.24k	if (ctx->can_store && (zip_uint64_t)ctx->first_read <= out_offset) {
254	269	ctx->is_stored = true;
255	269	ctx->size = (zip_uint64_t)ctx->first_read;
256	269	(void)memcpy_s(data, ctx->size, ctx->buffer, ctx->size);
257	269	return (zip_int64_t)ctx->size;
258	269	}
259	3.97k	end = true;
260	3.97k	break;
261
262	63.3k	case ZIP_COMPRESSION_OK:
263	63.3k	break;
264
265	77.9k	case ZIP_COMPRESSION_NEED_DATA:
266	77.9k	if (ctx->end_of_input) {
267		/* TODO: error: stream not ended, but no more input */
268	7.62k	end = true;
269	7.62k	break;
270	7.62k	}
271
272	70.3k	if ((n = zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) {
273	6.67k	zip_error_set_from_source(&ctx->error, src);
274	6.67k	end = true;
275	6.67k	break;
276	6.67k	}
277	63.7k	else if (n == 0) {
278	6.73k	ctx->end_of_input = true;
279	6.73k	ctx->algorithm->end_of_input(ctx->ud);
280	6.73k	if (ctx->first_read < 0) {
281	2.41k	ctx->first_read = 0;
282	2.41k	}
283	6.73k	}
284	56.9k	else {
285	56.9k	if (ctx->first_read >= 0) {
286		/* we overwrote a previously filled ctx->buffer */
287	32.6k	ctx->can_store = false;
288	32.6k	}
289	24.3k	else {
290	24.3k	ctx->first_read = n;
291	24.3k	}
292
293	56.9k	ctx->algorithm->input(ctx->ud, ctx->buffer, (zip_uint64_t)n);
294	56.9k	}
295	63.7k	break;
296
297	63.7k	case ZIP_COMPRESSION_ERROR:
298		/* error set by algorithm */
299	12.5k	if (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) {
300	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
301	0	}
302	12.5k	end = true;
303	12.5k	break;
304	159k	}
305	159k	}
306
307	60.5k	if (out_offset > 0) {
308	34.5k	ctx->can_store = false;
309	34.5k	ctx->size += out_offset;
310	34.5k	return (zip_int64_t)out_offset;
311	34.5k	}
312
313	26.0k	return (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) ? 0 : -1;
314	60.5k	}
315
316
317		static zip_int64_t
318	232k	compress_callback(zip_source_t src, void ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd) {
319	232k	struct context *ctx;
320
321	232k	ctx = (struct context *)ud;
322
323	232k	switch (cmd) {
324	30.2k	case ZIP_SOURCE_OPEN: {
325	30.2k	zip_stat_t st;
326	30.2k	zip_file_attributes_t attributes;
327
328	30.2k	ctx->size = 0;
329	30.2k	ctx->end_of_input = false;
330	30.2k	ctx->end_of_stream = false;
331	30.2k	ctx->is_stored = false;
332	30.2k	ctx->first_read = -1;
333
334	30.2k	if (zip_source_stat(src, &st) < 0 \|\| zip_source_get_file_attributes(src, &attributes) < 0) {
335	0	zip_error_set_from_source(&ctx->error, src);
336	0	return -1;
337	0	}
338
339	30.2k	if (!ctx->algorithm->start(ctx->ud, &st, &attributes)) {
340	0	return -1;
341	0	}
342
343	30.2k	return 0;
344	30.2k	}
345
346	65.0k	case ZIP_SOURCE_READ:
347	65.0k	return compress_read(src, ctx, data, len);
348
349	30.2k	case ZIP_SOURCE_CLOSE:
350	30.2k	if (!ctx->algorithm->end(ctx->ud)) {
351	0	return -1;
352	0	}
353	30.2k	return 0;
354
355	9.44k	case ZIP_SOURCE_STAT: {
356	9.44k	zip_stat_t *st;
357
358	9.44k	st = (zip_stat_t *)data;
359
360	9.44k	if (ctx->compress) {
361	1.41k	if (ctx->end_of_stream) {
362	947	st->comp_method = ctx->is_stored ? ZIP_CM_STORE : ZIP_CM_ACTUAL(ctx->method);
363	947	st->comp_size = ctx->size;
364	947	st->valid \|= ZIP_STAT_COMP_SIZE \| ZIP_STAT_COMP_METHOD;
365	947	}
366	471	else {
367	471	st->valid &= ~(ZIP_STAT_COMP_SIZE \| ZIP_STAT_COMP_METHOD);
368	471	}
369	1.41k	}
370	8.02k	else {
371	8.02k	st->comp_method = ZIP_CM_STORE;
372	8.02k	st->valid \|= ZIP_STAT_COMP_METHOD;
373	8.02k	st->valid &= ~ZIP_STAT_COMP_SIZE;
374	8.02k	if (ctx->end_of_stream) {
375	3.29k	st->size = ctx->size;
376	3.29k	st->valid \|= ZIP_STAT_SIZE;
377	3.29k	}
378	8.02k	}
379	9.44k	}
380	9.44k	return 0;
381
382	21.2k	case ZIP_SOURCE_ERROR:
383	21.2k	return zip_error_to_data(&ctx->error, data, len);
384
385	37.1k	case ZIP_SOURCE_FREE:
386	37.1k	context_free(ctx);
387	37.1k	return 0;
388
389	1.89k	case ZIP_SOURCE_GET_FILE_ATTRIBUTES: {
390	1.89k	zip_file_attributes_t attributes = (zip_file_attributes_t )data;
391
392	1.89k	if (len < sizeof(*attributes)) {
393	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
394	0	return -1;
395	0	}
396
397	1.89k	attributes->valid \|= ZIP_FILE_ATTRIBUTES_VERSION_NEEDED \| ZIP_FILE_ATTRIBUTES_GENERAL_PURPOSE_BIT_FLAGS;
398	1.89k	attributes->version_needed = ctx->algorithm->version_needed;
399	1.89k	attributes->general_purpose_bit_mask = ZIP_FILE_ATTRIBUTES_GENERAL_PURPOSE_BIT_FLAGS_ALLOWED_MASK;
400	1.89k	attributes->general_purpose_bit_flags = (ctx->is_stored ? 0 : ctx->algorithm->general_purpose_bit_flags(ctx->ud));
401
402	1.89k	return sizeof(*attributes);
403	1.89k	}
404
405	37.1k	case ZIP_SOURCE_SUPPORTS:
406	37.1k	return ZIP_SOURCE_SUPPORTS_READABLE \| zip_source_make_command_bitmap(ZIP_SOURCE_GET_FILE_ATTRIBUTES, ZIP_SOURCE_SUPPORTS_REOPEN, -1);
407
408	0	default:
409	0	return zip_source_pass_to_lower_layer(src, data, len, cmd);
410	232k	}
411	232k	}