From: Curtis Dunham Date: Tue, 1 Mar 2016 01:13:13 +0000 (-0600) Subject: base: support gzip-compressed object files X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=aa674268e97810c50110d0418e13d6ec96217689;p=gem5.git base: support gzip-compressed object files --- diff --git a/src/base/loader/object_file.cc b/src/base/loader/object_file.cc index e24aeddd3..d9ec852b7 100644 --- a/src/base/loader/object_file.cc +++ b/src/base/loader/object_file.cc @@ -33,6 +33,7 @@ #include #include #include +#include #include #include @@ -101,6 +102,61 @@ ObjectFile::close() } } +static bool +hasGzipMagic(int fd) +{ + uint8_t buf[2] = {0}; + size_t sz = pread(fd, buf, 2, 0); + panic_if(sz != 2, "Couldn't read magic bytes from object file"); + return ((buf[0] == 0x1f) && (buf[1] == 0x8b)); +} + +static int +doGzipLoad(int fd) +{ + const size_t blk_sz = 4096; + + gzFile fdz = gzdopen(fd, "rb"); + if (!fdz) { + return -1; + } + + size_t tmp_len = strlen(P_tmpdir); + char *tmpnam = (char*) malloc(tmp_len + 20); + strcpy(tmpnam, P_tmpdir); + strcpy(tmpnam+tmp_len, "/gem5-gz-obj-XXXXXX"); // 19 chars + fd = mkstemp(tmpnam); // repurposing fd variable for output + if (fd < 0) { + free(tmpnam); + gzclose(fdz); + return fd; + } + + if (unlink(tmpnam) != 0) + warn("couldn't remove temporary file %s\n", tmpnam); + + free(tmpnam); + + auto buf = new uint8_t[blk_sz]; + int r; // size of (r)emaining uncopied data in (buf)fer + while ((r = gzread(fdz, buf, blk_sz)) > 0) { + auto p = buf; // pointer into buffer + while (r > 0) { + auto sz = write(fd, p, r); + assert(sz <= r); + r -= sz; + p += sz; + } + } + delete[] buf; + gzclose(fdz); + if (r < 0) { // error + close(fd); + return -1; + } + assert(r == 0); // finished successfully + return fd; // return fd to decompressed temporary file for mmap()'ing +} ObjectFile * createObjectFile(const string &fname, bool raw) @@ -111,15 +167,24 @@ createObjectFile(const string &fname, bool raw) return NULL; } + // decompress GZ files + if (hasGzipMagic(fd)) { + fd = doGzipLoad(fd); + if (fd < 0) { + return NULL; + } + } + // find the length of the file by seeking to the end off_t off = lseek(fd, 0, SEEK_END); - fatal_if(off < 0, "Failed to determine size of object file %s\n", fname); - size_t len = static_cast(off); + fatal_if(off < 0, + "Failed to determine size of object file %s\n", fname); + auto len = static_cast(off); // mmap the whole shebang - uint8_t *fileData = - (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); + auto fileData = (uint8_t *)mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); close(fd); + if (fileData == MAP_FAILED) { return NULL; }