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Diffstat (limited to 'arch/powerpc/boot/gunzip_util.c')
| -rw-r--r-- | arch/powerpc/boot/gunzip_util.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/arch/powerpc/boot/gunzip_util.c b/arch/powerpc/boot/gunzip_util.c deleted file mode 100644 index 9dc52501de83..000000000000 --- a/arch/powerpc/boot/gunzip_util.c +++ /dev/null @@ -1,204 +0,0 @@ -/* - * Copyright 2007 David Gibson, IBM Corporation. - * Based on earlier work, Copyright (C) Paul Mackerras 1997. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <stddef.h> -#include "string.h" -#include "stdio.h" -#include "ops.h" -#include "gunzip_util.h" - -#define HEAD_CRC 2 -#define EXTRA_FIELD 4 -#define ORIG_NAME 8 -#define COMMENT 0x10 -#define RESERVED 0xe0 - -/** - * gunzip_start - prepare to decompress gzip data - * @state: decompressor state structure to be initialized - * @src: buffer containing gzip compressed or uncompressed data - * @srclen: size in bytes of the buffer at src - * - * If the buffer at @src contains a gzip header, this function - * initializes zlib to decompress the data, storing the decompression - * state in @state. The other functions in this file can then be used - * to decompress data from the gzipped stream. - * - * If the buffer at @src does not contain a gzip header, it is assumed - * to contain uncompressed data. The buffer information is recorded - * in @state and the other functions in this file will simply copy - * data from the uncompressed data stream at @src. - * - * Any errors, such as bad compressed data, cause an error to be - * printed an the platform's exit() function to be called. - */ -void gunzip_start(struct gunzip_state *state, void *src, int srclen) -{ - char *hdr = src; - int hdrlen = 0; - - memset(state, 0, sizeof(*state)); - - /* Check for gzip magic number */ - if ((hdr[0] == 0x1f) && (hdr[1] == 0x8b)) { - /* gzip data, initialize zlib parameters */ - int r, flags; - - state->s.workspace = state->scratch; - if (zlib_inflate_workspacesize() > sizeof(state->scratch)) - fatal("insufficient scratch space for gunzip\n\r"); - - /* skip header */ - hdrlen = 10; - flags = hdr[3]; - if (hdr[2] != Z_DEFLATED || (flags & RESERVED) != 0) - fatal("bad gzipped data\n\r"); - if ((flags & EXTRA_FIELD) != 0) - hdrlen = 12 + hdr[10] + (hdr[11] << 8); - if ((flags & ORIG_NAME) != 0) - while (hdr[hdrlen++] != 0) - ; - if ((flags & COMMENT) != 0) - while (hdr[hdrlen++] != 0) - ; - if ((flags & HEAD_CRC) != 0) - hdrlen += 2; - if (hdrlen >= srclen) - fatal("gunzip_start: ran out of data in header\n\r"); - - r = zlib_inflateInit2(&state->s, -MAX_WBITS); - if (r != Z_OK) - fatal("inflateInit2 returned %d\n\r", r); - } - - state->s.total_in = hdrlen; - state->s.next_in = src + hdrlen; - state->s.avail_in = srclen - hdrlen; -} - -/** - * gunzip_partial - extract bytes from a gzip data stream - * @state: gzip state structure previously initialized by gunzip_start() - * @dst: buffer to store extracted data - * @dstlen: maximum number of bytes to extract - * - * This function extracts at most @dstlen bytes from the data stream - * previously associated with @state by gunzip_start(), decompressing - * if necessary. Exactly @dstlen bytes are extracted unless the data - * stream doesn't contain enough bytes, in which case the entire - * remainder of the stream is decompressed. - * - * Returns the actual number of bytes extracted. If any errors occur, - * such as a corrupted compressed stream, an error is printed an the - * platform's exit() function is called. - */ -int gunzip_partial(struct gunzip_state *state, void *dst, int dstlen) -{ - int len; - - if (state->s.workspace) { - /* gunzipping */ - int r; - - state->s.next_out = dst; - state->s.avail_out = dstlen; - r = zlib_inflate(&state->s, Z_FULL_FLUSH); - if (r != Z_OK && r != Z_STREAM_END) - fatal("inflate returned %d msg: %s\n\r", r, state->s.msg); - len = state->s.next_out - (Byte *)dst; - } else { - /* uncompressed image */ - len = min(state->s.avail_in, (uLong)dstlen); - memcpy(dst, state->s.next_in, len); - state->s.next_in += len; - state->s.avail_in -= len; - } - return len; -} - -/** - * gunzip_exactly - extract a fixed number of bytes from a gzip data stream - * @state: gzip state structure previously initialized by gunzip_start() - * @dst: buffer to store extracted data - * @dstlen: number of bytes to extract - * - * This function extracts exactly @dstlen bytes from the data stream - * previously associated with @state by gunzip_start(), decompressing - * if necessary. - * - * If there are less @dstlen bytes available in the data stream, or if - * any other errors occur, such as a corrupted compressed stream, an - * error is printed an the platform's exit() function is called. - */ -void gunzip_exactly(struct gunzip_state *state, void *dst, int dstlen) -{ - int len; - - len = gunzip_partial(state, dst, dstlen); - if (len < dstlen) - fatal("\n\rgunzip_exactly: ran out of data!" - " Wanted %d, got %d.\n\r", dstlen, len); -} - -/** - * gunzip_discard - discard bytes from a gzip data stream - * @state: gzip state structure previously initialized by gunzip_start() - * @len: number of bytes to discard - * - * This function extracts, then discards exactly @len bytes from the - * data stream previously associated with @state by gunzip_start(). - * Subsequent gunzip_partial(), gunzip_exactly() or gunzip_finish() - * calls will extract the data following the discarded bytes in the - * data stream. - * - * If there are less @len bytes available in the data stream, or if - * any other errors occur, such as a corrupted compressed stream, an - * error is printed an the platform's exit() function is called. - */ -void gunzip_discard(struct gunzip_state *state, int len) -{ - static char discard_buf[128]; - - while (len > sizeof(discard_buf)) { - gunzip_exactly(state, discard_buf, sizeof(discard_buf)); - len -= sizeof(discard_buf); - } - - if (len > 0) - gunzip_exactly(state, discard_buf, len); -} - -/** - * gunzip_finish - extract all remaining bytes from a gzip data stream - * @state: gzip state structure previously initialized by gunzip_start() - * @dst: buffer to store extracted data - * @dstlen: maximum number of bytes to extract - * - * This function extracts all remaining data, or at most @dstlen - * bytes, from the stream previously associated with @state by - * gunzip_start(). zlib is then shut down, so it is an error to use - * any of the functions in this file on @state until it is - * re-initialized with another call to gunzip_start(). - * - * If any errors occur, such as a corrupted compressed stream, an - * error is printed an the platform's exit() function is called. - */ -int gunzip_finish(struct gunzip_state *state, void *dst, int dstlen) -{ - int len; - - len = gunzip_partial(state, dst, dstlen); - - if (state->s.workspace) { - zlib_inflateEnd(&state->s); - } - - return len; -} |