函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:lib\xz\xz_dec_lzma2.c Create Date:2022-07-27 08:06:47
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Take care of the LZMA2 control layer, and forward the job of actual LZMA* decoding or copying of uncompressed chunks to other functions.

函数原型：enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s, struct xz_buf *b)

返回类型：enum xz_ret

参数：

类型参数名称
struct xz_dec_lzma2 *s
struct xz_buf *b
936  当in_pos小于in_size或 Position in xz_dec_lzma2_run(). 恒等于SEQ_LZMA_RUN循环
938  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_CONTROL
970  tmp等于in[in_pos++]
972  如果tmp恒等于0x00则返回:XZ_STREAM_END
975  如果tmp大于等于0xE0或tmp恒等于0x01则
979  否则如果* True if dictionary reset is needed. This is false before * the first chunk (LZMA or uncompressed).则
980  返回:XZ_DATA_ERROR
983  如果tmp大于等于0x80则
1006  否则
1014  退出
1016  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_UNCOMPRESSED_1
1017  Uncompressed size of LZMA chunk (2 MiB at maximum) 加等于in[in_pos++]左移8位
1019  Position in xz_dec_lzma2_run(). 等于SEQ_UNCOMPRESSED_2
1020  退出
1022  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_UNCOMPRESSED_2
1023  Uncompressed size of LZMA chunk (2 MiB at maximum) 加等于in[in_pos++]加1
1025  Position in xz_dec_lzma2_run(). 等于SEQ_COMPRESSED_0
1026  退出
1028  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_COMPRESSED_0
1029  * Compressed size of LZMA chunk or compressed/uncompressed * size of uncompressed chunk (64 KiB at maximum)等于in[in_pos++]左移8位
1031  Position in xz_dec_lzma2_run(). 等于SEQ_COMPRESSED_1
1032  退出
1034  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_COMPRESSED_1
1035  * Compressed size of LZMA chunk or compressed/uncompressed * size of uncompressed chunk (64 KiB at maximum)加等于in[in_pos++]加1
1037  Position in xz_dec_lzma2_run(). 等于 Next position after decoding the compressed size of the chunk.
1038  退出
1040  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_PROPERTIES
1041  如果非Decode and validate LZMA properties (lc/lp/pb) and calculate the bit masks* from the decoded lp and pb values. On success, the LZMA decoder state is* reset and true is returned.则返回:XZ_DATA_ERROR
1044  Position in xz_dec_lzma2_run(). 等于SEQ_LZMA_PREPARE
1048  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_LZMA_PREPARE
1049  如果* Compressed size of LZMA chunk or compressed/uncompressed * size of uncompressed chunk (64 KiB at maximum)小于Range decoder initialization eats the first five bytes of each LZMA chunk.则返回:XZ_DATA_ERROR
1052  如果非Read the first five initial bytes into rc->code if they haven't been* read already. (Yes, the first byte gets completely ignored.)则返回:XZ_OK
1055  * Compressed size of LZMA chunk or compressed/uncompressed * size of uncompressed chunk (64 KiB at maximum)减等于Range decoder initialization eats the first five bytes of each LZMA chunk.
1056  Position in xz_dec_lzma2_run(). 等于SEQ_LZMA_RUN
1060  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_LZMA_RUN
1070  Set dictionary write limit
1073  如果非The LZMA decoder assumes that if the input limit (s->rc则返回:XZ_DATA_ERROR
1076  Uncompressed size of LZMA chunk (2 MiB at maximum) 减等于Flush pending data from dictionary to b->out. It is assumed that there is* enough space in b->out. This is guaranteed because caller uses dict_limit()* before decoding data into the dictionary.
1078  如果 Uncompressed size of LZMA chunk (2 MiB at maximum) 恒等于0则
1086  否则如果out_pos恒等于out_size或in_pos恒等于in_size且size小于* Compressed size of LZMA chunk or compressed/uncompressed * size of uncompressed chunk (64 KiB at maximum)则
1090  返回:XZ_OK
1093  退出
1095  当: Position in xz_dec_lzma2_run(). 恒等于SEQ_COPY
1096  Copy uncompressed data as is from input to dictionary and output buffers.
1097  如果* Compressed size of LZMA chunk or compressed/uncompressed * size of uncompressed chunk (64 KiB at maximum)大于0则返回:XZ_OK
1100  Position in xz_dec_lzma2_run(). 等于SEQ_CONTROL
1101  退出
1105  返回:XZ_OK
调用者
名称描述
dec_blockDecode the Compressed Data field from a Block