view mercurial/bitmanipulation.h @ 38047:dabc2237963c

crecord: fallback to text mode if diffs are too big for curses mode crecord uses curses.newpad to create a region that we can then scroll around in by moving the main 'screen' as a veiwport into the (probably larger than the actual screen) pad. Internally, at least in ncurses, pads are implemented using windows, which have their dimensions limited to a certain size. Depending on compilation options for ncurses, this size might be pretty small: (signed) short, or it might be larger ((signed) int). crecord wants to have enough room to have all of the contents of the main area of the chunkselector in the pad; this means that the full size with everything expanded must be less than these (undocumented, afaict) limits. It's not easy to write tests for this because the limits are platform- and installation- dependent and undocumented / unqueryable, as far as I can tell. Differential Revision: https://phab.mercurial-scm.org/D3577
author Kyle Lippincott <spectral@google.com>
date Thu, 17 May 2018 23:11:24 -0700
parents ce77b0563228
children 1fb2510cf8c8
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#ifndef _HG_BITMANIPULATION_H_
#define _HG_BITMANIPULATION_H_

#include <string.h>

#include "compat.h"

static inline uint32_t getbe32(const char *c)
{
	const unsigned char *d = (const unsigned char *)c;

	return ((d[0] << 24) | (d[1] << 16) | (d[2] << 8) | (d[3]));
}

static inline int16_t getbeint16(const char *c)
{
	const unsigned char *d = (const unsigned char *)c;

	return ((d[0] << 8) | (d[1]));
}

static inline uint16_t getbeuint16(const char *c)
{
	const unsigned char *d = (const unsigned char *)c;

	return ((d[0] << 8) | (d[1]));
}

static inline void putbe32(uint32_t x, char *c)
{
	c[0] = (x >> 24) & 0xff;
	c[1] = (x >> 16) & 0xff;
	c[2] = (x >> 8) & 0xff;
	c[3] = (x)&0xff;
}

static inline double getbefloat64(const char *c)
{
	const unsigned char *d = (const unsigned char *)c;
	double ret;
	int i;
	uint64_t t = 0;
	for (i = 0; i < 8; i++) {
		t = (t << 8) + d[i];
	}
	memcpy(&ret, &t, sizeof(t));
	return ret;
}

#endif