/src/libzip/lib/zip_source_compress.c

Source
/*
  zip_source_compress.c -- (de)compression routines
  Copyright (C) 2017-2025 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: 2026-02-26 06:41

Line	Count	Source
1		/*
2		zip_source_compress.c -- (de)compression routines
3		Copyright (C) 2017-2025 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	47.4k	zip_compression_algorithm_t *_zip_get_compression_algorithm(zip_int32_t method, bool compress) {
94	47.4k	size_t i;
95	47.4k	zip_uint16_t real_method = ZIP_CM_ACTUAL(method);
96
97	118k	for (i = 0; i < implementations_size; i++) {
98	113k	if (implementations[i].method == real_method) {
99	41.5k	if (compress) {
100	2.06k	return implementations[i].compress;
101	2.06k	}
102	39.5k	else {
103	39.5k	return implementations[i].decompress;
104	39.5k	}
105	41.5k	}
106	113k	}
107
108	5.84k	return NULL;
109	47.4k	}
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	1.03k	zip_source_t zip_source_compress(zip_t za, zip_source_t *src, zip_int32_t method, zip_uint32_t compression_flags) {
119	1.03k	return compression_source_new(za, src, method, true, compression_flags);
120	1.03k	}
121
122		zip_source_t *
123	45.3k	zip_source_decompress(zip_t za, zip_source_t src, zip_int32_t method) {
124	45.3k	return compression_source_new(za, src, method, false, 0);
125	45.3k	}
126
127
128	46.4k	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	46.4k	struct context *ctx;
130	46.4k	zip_source_t *s2;
131	46.4k	zip_compression_algorithm_t *algorithm = NULL;
132
133	46.4k	if (src == NULL) {
134	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
135	0	return NULL;
136	0	}
137
138	46.4k	if ((algorithm = _zip_get_compression_algorithm(method, compress)) == NULL) {
139	5.84k	zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
140	5.84k	return NULL;
141	5.84k	}
142
143	40.5k	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	40.5k	if ((s2 = zip_source_layered(za, src, compress_callback, ctx)) == NULL) {
149	0	context_free(ctx);
150	0	return NULL;
151	0	}
152
153	40.5k	return s2;
154	40.5k	}
155
156
157	40.5k	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	40.5k	struct context *ctx;
159
160	40.5k	if ((ctx = (struct context )malloc(sizeof(ctx))) == NULL) {
161	0	return NULL;
162	0	}
163	40.5k	zip_error_init(&ctx->error);
164	40.5k	ctx->can_store = compress ? method == ZIP_CM_DEFAULT : false;
165	40.5k	ctx->algorithm = algorithm;
166	40.5k	ctx->method = method;
167	40.5k	ctx->compress = compress;
168	40.5k	ctx->end_of_input = false;
169	40.5k	ctx->end_of_stream = false;
170	40.5k	ctx->is_stored = false;
171	40.5k	ctx->check_consistency = check_consistency;
172
173	40.5k	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	40.5k	return ctx;
180	40.5k	}
181
182
183		static void
184	40.5k	context_free(struct context *ctx) {
185	40.5k	if (ctx == NULL) {
186	0	return;
187	0	}
188
189	40.5k	ctx->algorithm->deallocate(ctx->ud);
190	40.5k	zip_error_fini(&ctx->error);
191
192	40.5k	free(ctx);
193	40.5k	}
194
195
196		static zip_int64_t
197	80.6k	compress_read(zip_source_t src, struct context ctx, void *data, zip_uint64_t len) {
198	80.6k	zip_compression_status_t ret;
199	80.6k	bool end;
200	80.6k	zip_int64_t n;
201	80.6k	zip_uint64_t out_offset;
202	80.6k	zip_uint64_t out_len;
203
204	80.6k	if (zip_error_code_zip(&ctx->error) != ZIP_ER_OK) {
205	870	return -1;
206	870	}
207
208	79.7k	if (len == 0 \|\| ctx->end_of_stream) {
209	3.76k	return 0;
210	3.76k	}
211
212	76.0k	out_offset = 0;
213
214	76.0k	end = false;
215	257k	while (!end && out_offset < len) {
216	181k	out_len = len - out_offset;
217	181k	ret = ctx->algorithm->process(ctx->ud, (zip_uint8_t *)data + out_offset, &out_len);
218
219	181k	if (ret != ZIP_COMPRESSION_ERROR) {
220	167k	out_offset += out_len;
221	167k	}
222
223	181k	switch (ret) {
224	5.77k	case ZIP_COMPRESSION_END:
225	5.77k	ctx->end_of_stream = true;
226
227	5.77k	if (!ctx->end_of_input) {
228	4.74k	n = zip_source_read(src, ctx->buffer, 1);
229	4.74k	if (n < 0) {
230	864	zip_error_set_from_source(&ctx->error, src);
231	864	end = true;
232	864	break;
233	864	}
234	3.87k	else if (n == 0) {
235	3.10k	ctx->end_of_input = true;
236	3.10k	n = ctx->algorithm->end_of_input(ctx->ud) ? 1 : 0;
237	3.10k	}
238
239	3.87k	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	3.87k	}
246
247	4.91k	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	4.91k	if (ctx->can_store && (zip_uint64_t)ctx->first_read <= out_offset) {
254	289	ctx->is_stored = true;
255	289	ctx->size = (zip_uint64_t)ctx->first_read;
256	289	(void)memcpy_s(data, ctx->size, ctx->buffer, ctx->size);
257	289	return (zip_int64_t)ctx->size;
258	289	}
259	4.62k	end = true;
260	4.62k	break;
261
262	79.2k	case ZIP_COMPRESSION_OK:
263	79.2k	break;
264
265	82.6k	case ZIP_COMPRESSION_NEED_DATA:
266	82.6k	if (ctx->end_of_input) {
267		/* TODO: error: stream not ended, but no more input */
268	10.0k	end = true;
269	10.0k	break;
270	10.0k	}
271
272	72.5k	if ((n = zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) {
273	7.20k	zip_error_set_from_source(&ctx->error, src);
274	7.20k	end = true;
275	7.20k	break;
276	7.20k	}
277	65.3k	else if (n == 0) {
278	7.51k	ctx->end_of_input = true;
279	7.51k	ctx->algorithm->end_of_input(ctx->ud);
280	7.51k	if (ctx->first_read < 0) {
281	2.38k	ctx->first_read = 0;
282	2.38k	}
283	7.51k	}
284	57.8k	else {
285	57.8k	if (ctx->first_read >= 0) {
286		/* we overwrote a previously filled ctx->buffer */
287	30.6k	ctx->can_store = false;
288	30.6k	}
289	27.1k	else {
290	27.1k	ctx->first_read = n;
291	27.1k	}
292
293	57.8k	ctx->algorithm->input(ctx->ud, ctx->buffer, (zip_uint64_t)n);
294	57.8k	}
295	65.3k	break;
296
297	65.3k	case ZIP_COMPRESSION_ERROR:
298		/* error set by algorithm */
299	14.1k	if (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) {
300	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
301	0	}
302	14.1k	end = true;
303	14.1k	break;
304	181k	}
305	181k	}
306
307	75.7k	if (out_offset > 0) {
308	46.8k	ctx->can_store = false;
309	46.8k	ctx->size += out_offset;
310	46.8k	return (zip_int64_t)out_offset;
311	46.8k	}
312
313	28.9k	return (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) ? 0 : -1;
314	75.7k	}
315
316
317		static zip_int64_t
318	265k	compress_callback(zip_source_t src, void ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd) {
319	265k	struct context *ctx;
320
321	265k	ctx = (struct context *)ud;
322
323	265k	switch (cmd) {
324	33.5k	case ZIP_SOURCE_OPEN: {
325	33.5k	zip_stat_t st;
326	33.5k	zip_file_attributes_t attributes;
327
328	33.5k	ctx->size = 0;
329	33.5k	ctx->end_of_input = false;
330	33.5k	ctx->end_of_stream = false;
331	33.5k	ctx->is_stored = false;
332	33.5k	ctx->first_read = -1;
333
334	33.5k	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	33.5k	if (!ctx->algorithm->start(ctx->ud, &st, &attributes)) {
340	0	return -1;
341	0	}
342
343	33.5k	return 0;
344	33.5k	}
345
346	80.6k	case ZIP_SOURCE_READ:
347	80.6k	return compress_read(src, ctx, data, len);
348
349	33.5k	case ZIP_SOURCE_CLOSE:
350	33.5k	if (!ctx->algorithm->end(ctx->ud)) {
351	0	return -1;
352	0	}
353	33.5k	return 0;
354
355	10.7k	case ZIP_SOURCE_STAT: {
356	10.7k	zip_stat_t *st;
357
358	10.7k	st = (zip_stat_t *)data;
359
360	10.7k	if (ctx->compress) {
361	1.52k	if (ctx->end_of_stream) {
362	1.03k	st->comp_method = ctx->is_stored ? ZIP_CM_STORE : ZIP_CM_ACTUAL(ctx->method);
363	1.03k	st->comp_size = ctx->size;
364	1.03k	st->valid \|= ZIP_STAT_COMP_SIZE \| ZIP_STAT_COMP_METHOD;
365	1.03k	}
366	490	else {
367	490	st->valid &= ~(ZIP_STAT_COMP_SIZE \| ZIP_STAT_COMP_METHOD);
368	490	}
369	1.52k	}
370	9.24k	else {
371	9.24k	st->comp_method = ZIP_CM_STORE;
372	9.24k	st->valid \|= ZIP_STAT_COMP_METHOD;
373	9.24k	st->valid &= ~ZIP_STAT_COMP_SIZE;
374	9.24k	if (ctx->end_of_stream) {
375	3.88k	st->size = ctx->size;
376	3.88k	st->valid \|= ZIP_STAT_SIZE;
377	3.88k	}
378	9.24k	}
379	10.7k	}
380	10.7k	return 0;
381
382	23.2k	case ZIP_SOURCE_ERROR:
383	23.2k	return zip_error_to_data(&ctx->error, data, len);
384
385	40.5k	case ZIP_SOURCE_FREE:
386	40.5k	context_free(ctx);
387	40.5k	return 0;
388
389	2.06k	case ZIP_SOURCE_GET_FILE_ATTRIBUTES: {
390	2.06k	zip_file_attributes_t attributes = (zip_file_attributes_t )data;
391
392	2.06k	if (len < sizeof(*attributes)) {
393	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
394	0	return -1;
395	0	}
396
397	2.06k	attributes->valid \|= ZIP_FILE_ATTRIBUTES_VERSION_NEEDED \| ZIP_FILE_ATTRIBUTES_GENERAL_PURPOSE_BIT_FLAGS;
398	2.06k	attributes->version_needed = ctx->algorithm->version_needed;
399	2.06k	attributes->general_purpose_bit_mask = ZIP_FILE_ATTRIBUTES_GENERAL_PURPOSE_BIT_FLAGS_ALLOWED_MASK;
400	2.06k	attributes->general_purpose_bit_flags = (ctx->is_stored ? 0 : ctx->algorithm->general_purpose_bit_flags(ctx->ud));
401
402	2.06k	return sizeof(*attributes);
403	2.06k	}
404
405	40.5k	case ZIP_SOURCE_SUPPORTS:
406	40.5k	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	265k	}
411	265k	}