358 lines
7.7 KiB
C
358 lines
7.7 KiB
C
/*
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* Copyright 2006 The Android Open Source Project
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*
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* Some handy functions for manipulating bits and bytes.
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*/
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#ifndef _MINZIP_BITS
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#define _MINZIP_BITS
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#include "inline_magic.h"
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#include <stdlib.h>
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#include <string.h>
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/*
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* Get 1 byte. (Included to make the code more legible.)
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*/
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INLINE unsigned char get1(unsigned const char* pSrc)
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{
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return *pSrc;
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}
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/*
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* Get 2 big-endian bytes.
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*/
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INLINE unsigned short get2BE(unsigned char const* pSrc)
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{
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unsigned short result;
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result = *pSrc++ << 8;
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result |= *pSrc++;
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return result;
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}
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/*
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* Get 4 big-endian bytes.
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*/
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INLINE unsigned int get4BE(unsigned char const* pSrc)
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{
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unsigned int result;
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result = *pSrc++ << 24;
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result |= *pSrc++ << 16;
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result |= *pSrc++ << 8;
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result |= *pSrc++;
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return result;
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}
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/*
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* Get 8 big-endian bytes.
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*/
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INLINE unsigned long long get8BE(unsigned char const* pSrc)
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{
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unsigned long long result;
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result = (unsigned long long) *pSrc++ << 56;
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result |= (unsigned long long) *pSrc++ << 48;
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result |= (unsigned long long) *pSrc++ << 40;
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result |= (unsigned long long) *pSrc++ << 32;
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result |= (unsigned long long) *pSrc++ << 24;
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result |= (unsigned long long) *pSrc++ << 16;
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result |= (unsigned long long) *pSrc++ << 8;
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result |= (unsigned long long) *pSrc++;
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return result;
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}
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/*
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* Get 2 little-endian bytes.
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*/
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INLINE unsigned short get2LE(unsigned char const* pSrc)
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{
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unsigned short result;
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result = *pSrc++;
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result |= *pSrc++ << 8;
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return result;
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}
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/*
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* Get 4 little-endian bytes.
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*/
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INLINE unsigned int get4LE(unsigned char const* pSrc)
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{
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unsigned int result;
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result = *pSrc++;
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result |= *pSrc++ << 8;
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result |= *pSrc++ << 16;
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result |= *pSrc++ << 24;
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return result;
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}
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/*
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* Get 8 little-endian bytes.
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*/
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INLINE unsigned long long get8LE(unsigned char const* pSrc)
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{
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unsigned long long result;
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result = (unsigned long long) *pSrc++;
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result |= (unsigned long long) *pSrc++ << 8;
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result |= (unsigned long long) *pSrc++ << 16;
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result |= (unsigned long long) *pSrc++ << 24;
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result |= (unsigned long long) *pSrc++ << 32;
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result |= (unsigned long long) *pSrc++ << 40;
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result |= (unsigned long long) *pSrc++ << 48;
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result |= (unsigned long long) *pSrc++ << 56;
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return result;
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}
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/*
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* Grab 1 byte and advance the data pointer.
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*/
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INLINE unsigned char read1(unsigned const char** ppSrc)
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{
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return *(*ppSrc)++;
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}
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/*
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* Grab 2 big-endian bytes and advance the data pointer.
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*/
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INLINE unsigned short read2BE(unsigned char const** ppSrc)
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{
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unsigned short result;
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result = *(*ppSrc)++ << 8;
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result |= *(*ppSrc)++;
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return result;
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}
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/*
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* Grab 4 big-endian bytes and advance the data pointer.
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*/
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INLINE unsigned int read4BE(unsigned char const** ppSrc)
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{
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unsigned int result;
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result = *(*ppSrc)++ << 24;
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result |= *(*ppSrc)++ << 16;
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result |= *(*ppSrc)++ << 8;
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result |= *(*ppSrc)++;
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return result;
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}
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/*
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* Get 8 big-endian bytes.
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*/
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INLINE unsigned long long read8BE(unsigned char const** ppSrc)
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{
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unsigned long long result;
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result = (unsigned long long) *(*ppSrc)++ << 56;
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result |= (unsigned long long) *(*ppSrc)++ << 48;
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result |= (unsigned long long) *(*ppSrc)++ << 40;
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result |= (unsigned long long) *(*ppSrc)++ << 32;
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result |= (unsigned long long) *(*ppSrc)++ << 24;
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result |= (unsigned long long) *(*ppSrc)++ << 16;
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result |= (unsigned long long) *(*ppSrc)++ << 8;
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result |= (unsigned long long) *(*ppSrc)++;
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return result;
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}
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/*
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* Grab 2 little-endian bytes and advance the data pointer.
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*/
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INLINE unsigned short read2LE(unsigned char const** ppSrc)
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{
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unsigned short result;
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result = *(*ppSrc)++;
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result |= *(*ppSrc)++ << 8;
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return result;
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}
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/*
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* Grab 4 little-endian bytes and advance the data pointer.
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*/
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INLINE unsigned int read4LE(unsigned char const** ppSrc)
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{
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unsigned int result;
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result = *(*ppSrc)++;
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result |= *(*ppSrc)++ << 8;
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result |= *(*ppSrc)++ << 16;
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result |= *(*ppSrc)++ << 24;
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return result;
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}
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/*
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* Get 8 little-endian bytes.
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*/
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INLINE unsigned long long read8LE(unsigned char const** ppSrc)
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{
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unsigned long long result;
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result = (unsigned long long) *(*ppSrc)++;
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result |= (unsigned long long) *(*ppSrc)++ << 8;
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result |= (unsigned long long) *(*ppSrc)++ << 16;
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result |= (unsigned long long) *(*ppSrc)++ << 24;
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result |= (unsigned long long) *(*ppSrc)++ << 32;
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result |= (unsigned long long) *(*ppSrc)++ << 40;
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result |= (unsigned long long) *(*ppSrc)++ << 48;
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result |= (unsigned long long) *(*ppSrc)++ << 56;
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return result;
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}
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/*
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* Skip over a UTF-8 string.
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*/
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INLINE void skipUtf8String(unsigned char const** ppSrc)
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{
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unsigned int length = read4BE(ppSrc);
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(*ppSrc) += length;
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}
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/*
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* Read a UTF-8 string into a fixed-size buffer, and null-terminate it.
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*
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* Returns the length of the original string.
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*/
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INLINE int readUtf8String(unsigned char const** ppSrc, char* buf, size_t bufLen)
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{
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unsigned int length = read4BE(ppSrc);
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size_t copyLen = (length < bufLen) ? length : bufLen-1;
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memcpy(buf, *ppSrc, copyLen);
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buf[copyLen] = '\0';
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(*ppSrc) += length;
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return length;
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}
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/*
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* Read a UTF-8 string into newly-allocated storage, and null-terminate it.
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*
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* Returns the string and its length. (The latter is probably unnecessary
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* for the way we're using UTF8.)
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*/
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INLINE char* readNewUtf8String(unsigned char const** ppSrc, size_t* pLength)
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{
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unsigned int length = read4BE(ppSrc);
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char* buf;
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buf = (char*) malloc(length+1);
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memcpy(buf, *ppSrc, length);
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buf[length] = '\0';
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(*ppSrc) += length;
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*pLength = length;
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return buf;
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}
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/*
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* Set 1 byte. (Included to make the code more legible.)
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*/
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INLINE void set1(unsigned char* buf, unsigned char val)
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{
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*buf = (unsigned char)(val);
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}
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/*
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* Set 2 big-endian bytes.
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*/
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INLINE void set2BE(unsigned char* buf, unsigned short val)
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{
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*buf++ = (unsigned char)(val >> 8);
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*buf = (unsigned char)(val);
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}
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/*
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* Set 4 big-endian bytes.
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*/
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INLINE void set4BE(unsigned char* buf, unsigned int val)
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{
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*buf++ = (unsigned char)(val >> 24);
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*buf++ = (unsigned char)(val >> 16);
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*buf++ = (unsigned char)(val >> 8);
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*buf = (unsigned char)(val);
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}
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/*
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* Set 8 big-endian bytes.
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*/
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INLINE void set8BE(unsigned char* buf, unsigned long long val)
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{
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*buf++ = (unsigned char)(val >> 56);
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*buf++ = (unsigned char)(val >> 48);
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*buf++ = (unsigned char)(val >> 40);
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*buf++ = (unsigned char)(val >> 32);
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*buf++ = (unsigned char)(val >> 24);
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*buf++ = (unsigned char)(val >> 16);
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*buf++ = (unsigned char)(val >> 8);
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*buf = (unsigned char)(val);
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}
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/*
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* Set 2 little-endian bytes.
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*/
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INLINE void set2LE(unsigned char* buf, unsigned short val)
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{
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*buf++ = (unsigned char)(val);
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*buf = (unsigned char)(val >> 8);
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}
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/*
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* Set 4 little-endian bytes.
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*/
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INLINE void set4LE(unsigned char* buf, unsigned int val)
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{
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*buf++ = (unsigned char)(val);
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*buf++ = (unsigned char)(val >> 8);
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*buf++ = (unsigned char)(val >> 16);
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*buf = (unsigned char)(val >> 24);
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}
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/*
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* Set 8 little-endian bytes.
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*/
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INLINE void set8LE(unsigned char* buf, unsigned long long val)
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{
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*buf++ = (unsigned char)(val);
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*buf++ = (unsigned char)(val >> 8);
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*buf++ = (unsigned char)(val >> 16);
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*buf++ = (unsigned char)(val >> 24);
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*buf++ = (unsigned char)(val >> 32);
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*buf++ = (unsigned char)(val >> 40);
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*buf++ = (unsigned char)(val >> 48);
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*buf = (unsigned char)(val >> 56);
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}
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/*
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* Stuff a UTF-8 string into the buffer.
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*/
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INLINE void setUtf8String(unsigned char* buf, const unsigned char* str)
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{
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unsigned int strLen = strlen((const char*)str);
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set4BE(buf, strLen);
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memcpy(buf + sizeof(unsigned int), str, strLen);
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}
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#endif /*_MINZIP_BITS*/
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