mirror of https://github.com/n1nj4sec/pupy.git
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
#include <zlib.h>
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#include "decompress.h"
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/* Zpipe code */
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#define CHUNK 8196
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int decompress(int fd, const char *buf, size_t size) {
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int ret;
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unsigned have;
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z_stream strm;
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unsigned char in[CHUNK];
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unsigned char out[CHUNK];
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/* allocate inflate state */
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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strm.avail_in = 0;
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strm.next_in = Z_NULL;
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ret = inflateInit2(&strm, 15+32);
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if (ret != Z_OK)
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return ret;
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/* decompress until deflate stream ends or end of file */
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do {
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strm.avail_in = size < CHUNK? size : CHUNK;
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if (strm.avail_in == 0)
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break;
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strm.next_in = buf;
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buf += strm.avail_in;
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size -= strm.avail_in;
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do {
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strm.avail_out = CHUNK;
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strm.next_out = out;
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ret = inflate(&strm, Z_NO_FLUSH);
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switch (ret) {
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case Z_NEED_DICT:
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ret = Z_DATA_ERROR; /* and fall through */
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case Z_DATA_ERROR:
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case Z_MEM_ERROR:
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(void)inflateEnd(&strm);
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return ret;
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}
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have = CHUNK - strm.avail_out;
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unsigned char *ptr = out;
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while (have) {
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int n = write(fd, ptr, have);
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if (n == -1) {
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(void)inflateEnd(&strm);
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return Z_ERRNO;
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}
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have -= n;
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ptr += n;
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}
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} while (strm.avail_out == 0);
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/* done when inflate() says it's done */
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} while (ret != Z_STREAM_END);
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/* clean up and return */
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(void)inflateEnd(&strm);
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return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
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}
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