7 #include "util/compress.h"
9 #include "util/debug.h"
12 #define CHUNK_SIZE 16384
14 int gzip_decompress_to_file(const char *input, int output_fd)
16 int ret = Z_STREAM_ERROR;
21 unsigned char buf[CHUNK_SIZE];
30 input_fd = open(input, O_RDONLY);
34 if (fstat(input_fd, &stbuf) < 0)
37 ptr = mmap(NULL, stbuf.st_size, PROT_READ, MAP_PRIVATE, input_fd, 0);
38 if (ptr == MAP_FAILED)
41 if (inflateInit2(&zs, 16 + MAX_WBITS) != Z_OK)
45 zs.avail_in = stbuf.st_size;
49 zs.avail_out = CHUNK_SIZE;
51 ret = inflate(&zs, Z_NO_FLUSH);
63 len = CHUNK_SIZE - zs.avail_out;
64 if (writen(output_fd, buf, len) != len) {
69 } while (ret != Z_STREAM_END);
74 munmap(ptr, stbuf.st_size);
78 return ret == Z_STREAM_END ? 0 : -1;