base: support gzip-compressed object files
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28289e5995
commit
aa674268e9
1 changed files with 69 additions and 4 deletions
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@ -33,6 +33,7 @@
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <zlib.h>
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#include <cstdio>
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#include <list>
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@ -101,6 +102,61 @@ ObjectFile::close()
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}
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}
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static bool
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hasGzipMagic(int fd)
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{
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uint8_t buf[2] = {0};
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size_t sz = pread(fd, buf, 2, 0);
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panic_if(sz != 2, "Couldn't read magic bytes from object file");
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return ((buf[0] == 0x1f) && (buf[1] == 0x8b));
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}
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static int
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doGzipLoad(int fd)
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{
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const size_t blk_sz = 4096;
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gzFile fdz = gzdopen(fd, "rb");
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if (!fdz) {
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return -1;
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}
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size_t tmp_len = strlen(P_tmpdir);
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char *tmpnam = (char*) malloc(tmp_len + 20);
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strcpy(tmpnam, P_tmpdir);
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strcpy(tmpnam+tmp_len, "/gem5-gz-obj-XXXXXX"); // 19 chars
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fd = mkstemp(tmpnam); // repurposing fd variable for output
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if (fd < 0) {
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free(tmpnam);
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gzclose(fdz);
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return fd;
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}
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if (unlink(tmpnam) != 0)
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warn("couldn't remove temporary file %s\n", tmpnam);
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free(tmpnam);
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auto buf = new uint8_t[blk_sz];
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int r; // size of (r)emaining uncopied data in (buf)fer
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while ((r = gzread(fdz, buf, blk_sz)) > 0) {
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auto p = buf; // pointer into buffer
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while (r > 0) {
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auto sz = write(fd, p, r);
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assert(sz <= r);
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r -= sz;
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p += sz;
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}
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}
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delete[] buf;
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gzclose(fdz);
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if (r < 0) { // error
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close(fd);
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return -1;
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}
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assert(r == 0); // finished successfully
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return fd; // return fd to decompressed temporary file for mmap()'ing
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}
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ObjectFile *
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createObjectFile(const string &fname, bool raw)
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@ -111,15 +167,24 @@ createObjectFile(const string &fname, bool raw)
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return NULL;
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}
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// decompress GZ files
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if (hasGzipMagic(fd)) {
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fd = doGzipLoad(fd);
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if (fd < 0) {
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return NULL;
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}
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}
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// find the length of the file by seeking to the end
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off_t off = lseek(fd, 0, SEEK_END);
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fatal_if(off < 0, "Failed to determine size of object file %s\n", fname);
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size_t len = static_cast<size_t>(off);
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fatal_if(off < 0,
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"Failed to determine size of object file %s\n", fname);
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auto len = static_cast<size_t>(off);
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// mmap the whole shebang
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uint8_t *fileData =
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(uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
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auto fileData = (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
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close(fd);
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if (fileData == MAP_FAILED) {
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return NULL;
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}
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