| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | #include <linux/lzma.h> |
| 2 | #include "compr.h" |
| 3 | |
| 4 | #ifdef __KERNEL__ |
| 5 | static DEFINE_MUTEX(deflate_mutex); |
| 6 | #endif |
| 7 | |
| 8 | Byte propsEncoded[LZMA_PROPS_SIZE]; |
| 9 | SizeT propsSize = sizeof(propsEncoded); |
| 10 | CLzmaEncHandle *p; |
| 11 | |
| 12 | STATIC void lzma_free_workspace(void) |
| 13 | { |
| 14 | LzmaEnc_Destroy(p, &lzma_alloc, &lzma_alloc); |
| 15 | } |
| 16 | |
| 17 | STATIC int INIT lzma_alloc_workspace(CLzmaEncProps *props_e) |
| 18 | { |
| 19 | if ((p = (CLzmaEncHandle *)LzmaEnc_Create(&lzma_alloc)) == NULL) |
| 20 | { |
| 21 | PRINT_ERROR("Failed to allocate lzma deflate workspace\n"); |
| 22 | return -ENOMEM; |
| 23 | } |
| 24 | |
| 25 | if (LzmaEnc_SetProps(p, props_e) != SZ_OK) |
| 26 | { |
| 27 | lzma_free_workspace(); |
| 28 | return -1; |
| 29 | } |
| 30 | |
| 31 | if (LzmaEnc_WriteProperties(p, propsEncoded, &propsSize) != SZ_OK) |
| 32 | { |
| 33 | lzma_free_workspace(); |
| 34 | return -1; |
| 35 | } |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | STATIC int jffs2_lzma_decompress(unsigned char *data_in, unsigned char *cpage_out, |
| 41 | uint32_t srclen, uint32_t destlen) |
| 42 | { |
| 43 | int ret; |
| 44 | SizeT dl = (SizeT)destlen; |
| 45 | SizeT sl = (SizeT)srclen; |
| 46 | ELzmaStatus status; |
| 47 | |
| 48 | ret = LzmaDecode(cpage_out, &dl, data_in, &sl, propsEncoded, |
| 49 | propsSize, LZMA_FINISH_ANY, &status, &lzma_alloc); |
| 50 | |
| 51 | if (ret != SZ_OK || status == LZMA_STATUS_NOT_FINISHED || dl != (SizeT)destlen) |
| 52 | return -1; |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | STATIC int jffs2_lzma_compress(unsigned char *data_in, unsigned char *cpage_out, |
| 58 | uint32_t *sourcelen, uint32_t *dstlen) |
| 59 | { |
| 60 | SizeT compress_size = (SizeT)(*dstlen); |
| 61 | int ret; |
| 62 | |
| 63 | #ifdef __KERNEL__ |
| 64 | mutex_lock(&deflate_mutex); |
| 65 | #endif |
| 66 | |
| 67 | ret = LzmaEnc_MemEncode(p, cpage_out, &compress_size, data_in, *sourcelen, |
| 68 | 0, NULL, &lzma_alloc, &lzma_alloc); |
| 69 | |
| 70 | #ifdef __KERNEL__ |
| 71 | mutex_unlock(&deflate_mutex); |
| 72 | #endif |
| 73 | |
| 74 | if (ret != SZ_OK) |
| 75 | return -1; |
| 76 | |
| 77 | *dstlen = (uint32_t)compress_size; |
| 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | |
| 83 | static struct jffs2_compressor jffs2_lzma_comp = { |
| 84 | .priority = JFFS2_LZMA_PRIORITY, |
| 85 | .name = "lzma", |
| 86 | .compr = JFFS2_COMPR_LZMA, |
| 87 | .compress = &jffs2_lzma_compress, |
| 88 | .decompress = &jffs2_lzma_decompress, |
| 89 | .disabled = 0, |
| 90 | }; |
| 91 | |
| 92 | void jffs2_lzma_exit(void) |
| 93 | { |
| 94 | jffs2_unregister_compressor(&jffs2_lzma_comp); |
| 95 | lzma_free_workspace(); |
| 96 | } |
| 97 | |
| 98 | int INIT jffs2_lzma_init(void) |
| 99 | { |
| 100 | int ret; |
| 101 | CLzmaEncProps props; |
| 102 | LzmaEncProps_Init(&props); |
| 103 | |
| 104 | props.dictSize = LZMA_BEST_DICT(0x2000); |
| 105 | props.level = LZMA_BEST_LEVEL; |
| 106 | props.lc = LZMA_BEST_LC; |
| 107 | props.lp = LZMA_BEST_LP; |
| 108 | props.pb = LZMA_BEST_PB; |
| 109 | props.fb = LZMA_BEST_FB; |
| 110 | |
| 111 | ret = lzma_alloc_workspace(&props); |
| 112 | if (ret < 0) |
| 113 | return ret; |
| 114 | |
| 115 | ret = jffs2_register_compressor(&jffs2_lzma_comp); |
| 116 | if (ret) |
| 117 | lzma_free_workspace(); |
| 118 | |
| 119 | return ret; |
| 120 | } |