- if (PicoMessage != NULL && offset > 6*1024*1024) {\r
- long pos = gztell((gzFile) stream->param);\r
- if (offset < pos || offset - pos > 6*1024*1024)\r
- PicoMessage("Decompressing data...");\r
+ struct zip_file *z = stream->file;\r
+ unsigned int pos = z->pos;\r
+ int ret;\r
+\r
+ switch (whence)\r
+ {\r
+ case SEEK_CUR: pos += offset; break;\r
+ case SEEK_SET: pos = offset; break;\r
+ case SEEK_END: pos = stream->size - offset; break;\r
+ }\r
+ if (z->entry->compression_method == 0) {\r
+ ret = fseek(z->zip->fp, z->start + pos, SEEK_SET);\r
+ if (ret == 0)\r
+ return (z->pos = pos);\r
+ return -1;\r
+ }\r
+ offset = pos - z->pos;\r
+ if (pos < z->pos) {\r
+ // full decompress from the start\r
+ fseek(z->zip->fp, z->start, SEEK_SET);\r
+ z->stream.avail_in = 0;\r
+ z->stream.next_in = z->inbuf;\r
+ inflateReset(&z->stream);\r
+ z->pos = 0;\r
+ offset = pos;\r
+ }\r
+\r
+ if (PicoMessage != NULL && offset > 4 * 1024 * 1024)\r
+ PicoMessage("Decompressing data...");\r
+\r
+ while (offset > 0) {\r
+ char buf[16 * 1024];\r
+ size_t l = offset > sizeof(buf) ? sizeof(buf) : offset;\r
+ ret = pm_read(buf, l, stream);\r
+ if (ret != l)\r
+ break;\r
+ offset -= l;\r