diff options
Diffstat (limited to 'src/xzdec')
| -rw-r--r-- | src/xzdec/xzdec.1 | 8 | ||||
| -rw-r--r-- | src/xzdec/xzdec.c | 42 |
2 files changed, 34 insertions, 16 deletions
diff --git a/src/xzdec/xzdec.1 b/src/xzdec/xzdec.1 index 442a19ec..3057c586 100644 --- a/src/xzdec/xzdec.1 +++ b/src/xzdec/xzdec.1 @@ -4,7 +4,7 @@ .\" This file has been put into the public domain. .\" You can do whatever you want with this file. .\" -.TH XZDEC 1 "2009-06-04" "Tukaani" "XZ Utils" +.TH XZDEC 1 "2010-03-07" "Tukaani" "XZ Utils" .SH NAME xzdec, lzmadec \- Small .xz and .lzma decompressors .SH SYNOPSIS @@ -99,8 +99,7 @@ can be specified as a percentage of physical RAM. Example: .IP \(bu 3 The .I limit -can be reset back to its default value (currently 40 % of physical RAM) -by setting it to +can be reset back to its default value by setting it to .BR 0 . .IP \(bu 3 The memory usage limiting can be effectively disabled by setting @@ -163,6 +162,7 @@ for executables distributed in typical non-embedded operating system distributions. If you need a truly small .B .xz decompressor, consider using XZ Embedded. -.\" TODO: Provide URL to XZ Embedded. .SH "SEE ALSO" .BR xz (1) +.PP +XZ Embedded: <http://tukaani.org/xz/embedded.html> diff --git a/src/xzdec/xzdec.c b/src/xzdec/xzdec.c index 2b166861..6ddf7d28 100644 --- a/src/xzdec/xzdec.c +++ b/src/xzdec/xzdec.c @@ -38,6 +38,9 @@ /// Number of bytes to use memory at maximum static uint64_t memlimit; +/// Total amount of physical RAM +static uint64_t total_ram; + /// Error messages are suppressed if this is zero, which is the case when /// --quiet has been given at least twice. static unsigned int display_errors = 2; @@ -103,14 +106,7 @@ version(void) static void memlimit_set_percentage(uint32_t percentage) { - uint64_t mem = lzma_physmem(); - - // If we cannot determine the amount of RAM, use the assumption - // set by the configure script. - if (mem == 0) - mem = (uint64_t)(ASSUME_RAM) * 1024 * 1024; - - memlimit = percentage * mem / 100; + memlimit = percentage * total_ram / 100; return; } @@ -120,15 +116,37 @@ memlimit_set_percentage(uint32_t percentage) static void memlimit_set(uint64_t new_memlimit) { - if (new_memlimit == 0) - memlimit_set_percentage(40); - else + if (new_memlimit != 0) { memlimit = new_memlimit; + } else { + memlimit = 40 * total_ram / 100; + if (memlimit < UINT64_C(80) * 1024 * 1024) { + memlimit = 80 * total_ram / 100; + if (memlimit > UINT64_C(80) * 1024 * 1024) + memlimit = UINT64_C(80) * 1024 * 1024; + } + } return; } +/// Get the total amount of physical RAM and set the memory usage limit +/// to the default value. +static void +memlimit_init(void) +{ + // If we cannot determine the amount of RAM, use the assumption + // defined by the configure script. + total_ram = lzma_physmem(); + if (total_ram == 0) + total_ram = (uint64_t)(ASSUME_RAM) * 1024 * 1024; + + memlimit_set(0); + return; +} + + /// \brief Convert a string to uint64_t /// /// This is rudely copied from src/xz/util.c and modified a little. :-( @@ -422,7 +440,7 @@ main(int argc, char **argv) // Set the default memory usage limit. This is needed before parsing // the command line arguments. - memlimit_set(0); + memlimit_init(); // Parse the command line options. parse_options(argc, argv); |