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1// SPDX-License-Identifier: GPL-2.02#ifdef STATIC3#define PREBOOT4/* Pre-boot environment: included */5 6/* prevent inclusion of _LINUX_KERNEL_H in pre-boot environment: lots7 * errors about console_printk etc... on ARM */8#define _LINUX_KERNEL_H9 10#include "zlib_inflate/inftrees.c"11#include "zlib_inflate/inffast.c"12#include "zlib_inflate/inflate.c"13#ifdef CONFIG_ZLIB_DFLTCC14#include "zlib_dfltcc/dfltcc.c"15#include "zlib_dfltcc/dfltcc_inflate.c"16#endif17 18#else /* STATIC */19/* initramfs et al: linked */20 21#include <linux/zutil.h>22 23#include "zlib_inflate/inftrees.h"24#include "zlib_inflate/inffast.h"25#include "zlib_inflate/inflate.h"26 27#include "zlib_inflate/infutil.h"28#include <linux/decompress/inflate.h>29 30#endif /* STATIC */31 32#include <linux/decompress/mm.h>33 34#define GZIP_IOBUF_SIZE (16*1024)35 36static long INIT nofill(void *buffer, unsigned long len)37{38 return -1;39}40 41/* Included from initramfs et al code */42static int INIT __gunzip(unsigned char *buf, long len,43 long (*fill)(void*, unsigned long),44 long (*flush)(void*, unsigned long),45 unsigned char *out_buf, long out_len,46 long *pos,47 void(*error)(char *x)) {48 u8 *zbuf;49 struct z_stream_s *strm;50 int rc;51 52 rc = -1;53 if (flush) {54 out_len = 0x8000; /* 32 K */55 out_buf = malloc(out_len);56 } else {57 if (!out_len)58 out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */59 }60 if (!out_buf) {61 error("Out of memory while allocating output buffer");62 goto gunzip_nomem1;63 }64 65 if (buf)66 zbuf = buf;67 else {68 zbuf = malloc(GZIP_IOBUF_SIZE);69 len = 0;70 }71 if (!zbuf) {72 error("Out of memory while allocating input buffer");73 goto gunzip_nomem2;74 }75 76 strm = malloc(sizeof(*strm));77 if (strm == NULL) {78 error("Out of memory while allocating z_stream");79 goto gunzip_nomem3;80 }81 82 strm->workspace = malloc(flush ? zlib_inflate_workspacesize() :83#ifdef CONFIG_ZLIB_DFLTCC84 /* Always allocate the full workspace for DFLTCC */85 zlib_inflate_workspacesize());86#else87 sizeof(struct inflate_state));88#endif89 if (strm->workspace == NULL) {90 error("Out of memory while allocating workspace");91 goto gunzip_nomem4;92 }93 94 if (!fill)95 fill = nofill;96 97 if (len == 0)98 len = fill(zbuf, GZIP_IOBUF_SIZE);99 100 /* verify the gzip header */101 if (len < 10 ||102 zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) {103 if (pos)104 *pos = 0;105 error("Not a gzip file");106 goto gunzip_5;107 }108 109 /* skip over gzip header (1f,8b,08... 10 bytes total +110 * possible asciz filename)111 */112 strm->next_in = zbuf + 10;113 strm->avail_in = len - 10;114 /* skip over asciz filename */115 if (zbuf[3] & 0x8) {116 do {117 /*118 * If the filename doesn't fit into the buffer,119 * the file is very probably corrupt. Don't try120 * to read more data.121 */122 if (strm->avail_in == 0) {123 error("header error");124 goto gunzip_5;125 }126 --strm->avail_in;127 } while (*strm->next_in++);128 }129 130 strm->next_out = out_buf;131 strm->avail_out = out_len;132 133 rc = zlib_inflateInit2(strm, -MAX_WBITS);134 135#ifdef CONFIG_ZLIB_DFLTCC136 /* Always keep the window for DFLTCC */137#else138 if (!flush) {139 WS(strm)->inflate_state.wsize = 0;140 WS(strm)->inflate_state.window = NULL;141 }142#endif143 144 while (rc == Z_OK) {145 if (strm->avail_in == 0) {146 /* TODO: handle case where both pos and fill are set */147 len = fill(zbuf, GZIP_IOBUF_SIZE);148 if (len < 0) {149 rc = -1;150 error("read error");151 break;152 }153 strm->next_in = zbuf;154 strm->avail_in = len;155 }156 rc = zlib_inflate(strm, 0);157 158 /* Write any data generated */159 if (flush && strm->next_out > out_buf) {160 long l = strm->next_out - out_buf;161 if (l != flush(out_buf, l)) {162 rc = -1;163 error("write error");164 break;165 }166 strm->next_out = out_buf;167 strm->avail_out = out_len;168 }169 170 /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */171 if (rc == Z_STREAM_END) {172 rc = 0;173 break;174 } else if (rc != Z_OK) {175 error("uncompression error");176 rc = -1;177 }178 }179 180 zlib_inflateEnd(strm);181 if (pos)182 /* add + 8 to skip over trailer */183 *pos = strm->next_in - zbuf+8;184 185gunzip_5:186 free(strm->workspace);187gunzip_nomem4:188 free(strm);189gunzip_nomem3:190 if (!buf)191 free(zbuf);192gunzip_nomem2:193 if (flush)194 free(out_buf);195gunzip_nomem1:196 return rc; /* returns Z_OK (0) if successful */197}198 199#ifndef PREBOOT200STATIC int INIT gunzip(unsigned char *buf, long len,201 long (*fill)(void*, unsigned long),202 long (*flush)(void*, unsigned long),203 unsigned char *out_buf,204 long *pos,205 void (*error)(char *x))206{207 return __gunzip(buf, len, fill, flush, out_buf, 0, pos, error);208}209#else210STATIC int INIT __decompress(unsigned char *buf, long len,211 long (*fill)(void*, unsigned long),212 long (*flush)(void*, unsigned long),213 unsigned char *out_buf, long out_len,214 long *pos,215 void (*error)(char *x))216{217 return __gunzip(buf, len, fill, flush, out_buf, out_len, pos, error);218}219#endif220