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c12e300bb8
Summary: Move top-level Python packages `mercurial`, `hgext` and `hgdemandimport` to a new top-level package `edenscm`. This allows the Python packages provided by the upstream Mercurial to be installed side-by-side. To maintain compatibility, `edenscm/` gets added to `sys.path` in `mercurial/__init__.py`. Reviewed By: phillco, ikostia Differential Revision: D13853115 fbshipit-source-id: b296b0673dc54c61ef6a591ebc687057ff53b22e
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
#ifndef _HG_BITMANIPULATION_H_
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#define _HG_BITMANIPULATION_H_
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#include <string.h>
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#include "compat.h"
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#if defined(_MSC_VER)
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/* Windows only supports little-endian platforms */
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static inline uint64_t hg_be_u64(uint64_t x) {
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return _byteswap_uint64(x);
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}
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static inline uint32_t hg_be_u32(uint32_t x) {
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return _byteswap_ulong(x);
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}
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static inline uint16_t hg_be_u16(uint16_t x) {
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return _byteswap_ushort(x);
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}
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#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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static inline uint64_t hg_be_u64(uint64_t x) {
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return __builtin_bswap64(x);
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}
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static inline uint32_t hg_be_u32(uint32_t x) {
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return __builtin_bswap32(x);
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}
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static inline uint16_t hg_be_u16(uint16_t x) {
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return __builtin_bswap16(x);
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}
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#else
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/* For completeness... */
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static inline uint64_t hg_be_u64(uint64_t x) {
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return x;
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}
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static inline uint32_t hg_be_u32(uint32_t x) {
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return x;
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}
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static inline uint16_t hg_be_u16(uint16_t x) {
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return x;
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}
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#endif
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static inline uint32_t getbe32(const char* c) {
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uint32_t value;
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memcpy(&value, c, sizeof(value));
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return hg_be_u32(value);
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}
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static inline uint16_t getbeuint16(const char* c) {
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uint16_t value;
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memcpy(&value, c, sizeof(value));
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return hg_be_u16(value);
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}
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static inline int16_t getbeint16(const char* c) {
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/*
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* Note: this code technically has undefined behavior for negative
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* values, although it's written in a way that the compiler and UBSAN
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* hopefully shouldn't complain about it.
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*
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* This relies on the platform using 2s-compliment representations for
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* signed integers. This isn't guaranteed by the C standard, but is
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* true in practice for all modern platforms.
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*/
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union {
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uint16_t unsignedvalue;
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int16_t signedvalue;
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} u;
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u.unsignedvalue = getbeuint16(c);
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return u.signedvalue;
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}
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static inline void putbe32(uint32_t x, char* c) {
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uint32_t v = hg_be_u32(x);
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memcpy(c, &v, sizeof(v));
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}
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static inline double getbefloat64(const char* c) {
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uint64_t n;
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double d;
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memcpy(&n, c, sizeof(n));
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n = hg_be_u64(n);
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memcpy(&d, &n, sizeof(n));
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return d;
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}
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#endif
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