50
51
static int memory_read_close(struct archive *, void *);
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static int memory_read_open(struct archive *, void *);
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static off_t memory_read_skip(struct archive *, void *, off_t request);
53
static int64_t memory_read_seek(struct archive *, void *, int64_t request, int whence);
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static int64_t memory_read_skip(struct archive *, void *, int64_t request);
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55
static ssize_t memory_read(struct archive *, void *, const void **buff);
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static int read_open_memory_internal(struct archive *a, void *buff,
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57
size_t size, size_t read_size, int fullapi);
59
61
read_open_memory(struct archive *a, void *buff, size_t size, size_t read_size)
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return read_open_memory_internal(a, buff, size, read_size, 1);
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return read_open_memory_internal(a, buff, size, read_size, 2);
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71
read_open_memory2(struct archive *a, void *buff, size_t size, size_t read_size)
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return read_open_memory_internal(a, buff, size, read_size, 0);
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return read_open_memory_internal(a, buff, size, read_size, 1);
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* Include a seek callback as well.
80
read_open_memory_seek(struct archive *a, void *buff, size_t size, size_t read_size)
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return read_open_memory_internal(a, buff, size, read_size, 3);
75
86
read_open_memory_internal(struct archive *a, void *buff,
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size_t size, size_t read_size, int fullapi)
87
size_t size, size_t read_size, int level)
78
89
struct read_memory_data *mine;
83
94
return (ARCHIVE_FATAL);
85
96
memset(mine, 0, sizeof(*mine));
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mine->buffer = (unsigned char *)buff;
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mine->end = mine->buffer + size;
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mine->start = mine->p = (unsigned char *)buff;
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mine->end = mine->start + size;
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mine->read_size = read_size;
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mine->copy_buff_offset = 32;
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mine->copy_buff_size = read_size + mine->copy_buff_offset * 2;
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mine->copy_buff = malloc(mine->copy_buff_size);
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memset(mine->copy_buff, 0xA5, mine->copy_buff_size);
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return (archive_read_open2(a, mine, memory_read_open,
95
memory_read, memory_read_skip, memory_read_close));
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return (archive_read_open2(a, mine, NULL,
98
memory_read, NULL, memory_read_close));
107
archive_read_set_seek_callback(a, memory_read_seek);
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archive_read_set_open_callback(a, memory_read_open);
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archive_read_set_skip_callback(a, memory_read_skip);
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archive_read_set_read_callback(a, memory_read);
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archive_read_set_close_callback(a, memory_read_close);
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archive_read_set_callback_data(a, mine);
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return archive_read_open1(a);
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137
memory_read(struct archive *a, void *client_data, const void **buff)
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struct read_memory_data *mine = (struct read_memory_data *)client_data;
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(void)a; /* UNUSED */
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size = mine->end - mine->buffer;
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if (size > mine->read_size)
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size = mine->end - mine->p;
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if ((size_t)size > mine->read_size)
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149
size = mine->read_size;
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151
memset(mine->copy_buff, 0xA5, mine->copy_buff_size);
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memcpy(mine->copy_buff + mine->copy_buff_offset, mine->buffer, size);
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memcpy(mine->copy_buff + mine->copy_buff_offset, mine->p, size);
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*buff = mine->copy_buff + mine->copy_buff_offset;
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mine->buffer += size;
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return ((ssize_t)size);
138
160
* How mean can a skip() routine be? Let's try to find out.
141
memory_read_skip(struct archive *a, void *client_data, off_t skip)
163
memory_read_skip(struct archive *a, void *client_data, int64_t skip)
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struct read_memory_data *mine = (struct read_memory_data *)client_data;
145
167
(void)a; /* UNUSED */
146
168
/* We can't skip by more than is available. */
147
if ((off_t)skip > (off_t)(mine->end - mine->buffer))
148
skip = mine->end - mine->buffer;
169
if ((off_t)skip > (off_t)(mine->end - mine->p))
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skip = mine->end - mine->p;
149
171
/* Always do small skips by prime amounts. */
152
mine->buffer += skip;
181
memory_read_seek(struct archive *a, void *client_data, int64_t offset, int whence)
183
struct read_memory_data *mine = (struct read_memory_data *)client_data;
185
(void)a; /* UNUSED */
188
mine->p = mine->start + offset;
191
mine->p = mine->end + offset;
197
if (mine->p < mine->start) {
198
mine->p = mine->start;
199
return ARCHIVE_FAILED;
201
if (mine->p > mine->end) {
203
return ARCHIVE_FAILED;
205
return (mine->p - mine->start);
157
209
* Close is just cleaning up our one small bit of data.