diff options
Diffstat (limited to 'libtiff/tif_vms.c')
| -rw-r--r-- | libtiff/tif_vms.c | 588 |
1 files changed, 588 insertions, 0 deletions
diff --git a/libtiff/tif_vms.c b/libtiff/tif_vms.c new file mode 100644 index 00000000..0b00de31 --- /dev/null +++ b/libtiff/tif_vms.c @@ -0,0 +1,588 @@ +/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_vms.c,v 1.1 1999-07-27 21:50:27 mike Exp $ */ + +/* + * Copyright (c) 1988-1997 Sam Leffler + * Copyright (c) 1991-1997 Silicon Graphics, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software and + * its documentation for any purpose is hereby granted without fee, provided + * that (i) the above copyright notices and this permission notice appear in + * all copies of the software and related documentation, and (ii) the names of + * Sam Leffler and Silicon Graphics may not be used in any advertising or + * publicity relating to the software without the specific, prior written + * permission of Sam Leffler and Silicon Graphics. + * + * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, + * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY + * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. + * + * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR + * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, + * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, + * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF + * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ + +/* + * TIFF Library VMS-specific Routines. + */ + +#include <stdlib.h> +#include <unixio.h> +#include "tiffiop.h" +#if !HAVE_IEEEFP +#include <math.h> +#endif + +#ifdef VAXC +#define NOSHARE noshare +#else +#define NOSHARE +#endif + +#ifdef __alpha +/* Dummy entry point for backwards compatibility */ +void TIFFModeCCITTFax3(void){} +#endif + +static tsize_t +_tiffReadProc(thandle_t fd, tdata_t buf, tsize_t size) +{ + return (read((int) fd, buf, size)); +} + +static tsize_t +_tiffWriteProc(thandle_t fd, tdata_t buf, tsize_t size) +{ + return (write((int) fd, buf, size)); +} + +static toff_t +_tiffSeekProc(thandle_t fd, toff_t off, int whence) +{ + return ((toff_t) lseek((int) fd, (off_t) off, whence)); +} + +static int +_tiffCloseProc(thandle_t fd) +{ + return (close((int) fd)); +} + +#include <sys/stat.h> + +static toff_t +_tiffSizeProc(thandle_t fd) +{ + struct stat sb; + return (toff_t) (fstat((int) fd, &sb) < 0 ? 0 : sb.st_size); +} + +#ifdef HAVE_MMAP +#include <starlet.h> +#include <fab.h> +#include <secdef.h> + +/* + * Table for storing information on current open sections. + * (Should really be a linked list) + */ +#define MAX_MAPPED 100 +static int no_mapped = 0; +static struct { + char *base; + char *top; + unsigned short channel; +} map_table[MAX_MAPPED]; + +/* + * This routine maps a file into a private section. Note that this + * method of accessing a file is by far the fastest under VMS. + * The routine may fail (i.e. return 0) for several reasons, for + * example: + * - There is no more room for storing the info on sections. + * - The process is out of open file quota, channels, ... + * - fd does not describe an opened file. + * - The file is already opened for write access by this process + * or another process + * - There is no free "hole" in virtual memory that fits the + * size of the file + */ +static int +_tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize) +{ + char name[256]; + struct FAB fab; + unsigned short channel; + char *inadr[2], *retadr[2]; + unsigned long status; + long size; + + if (no_mapped >= MAX_MAPPED) + return(0); + /* + * We cannot use a file descriptor, we + * must open the file once more. + */ + if (getname((int)fd, name, 1) == NULL) + return(0); + /* prepare the FAB for a user file open */ + fab = cc$rms_fab; + fab.fab$l_fop |= FAB$V_UFO; + fab.fab$b_fac = FAB$M_GET; + fab.fab$b_shr = FAB$M_SHRGET; + fab.fab$l_fna = name; + fab.fab$b_fns = strlen(name); + status = sys$open(&fab); /* open file & get channel number */ + if ((status&1) == 0) + return(0); + channel = (unsigned short)fab.fab$l_stv; + inadr[0] = inadr[1] = (char *)0; /* just an address in P0 space */ + /* + * Map the blocks of the file up to + * the EOF block into virtual memory. + */ + size = _tiffSizeProc(fd); + status = sys$crmpsc(inadr, retadr, 0, SEC$M_EXPREG, 0,0,0, channel, + TIFFhowmany(size,512), 0,0,0); + if ((status&1) == 0){ + sys$dassgn(channel); + return(0); + } + *pbase = (tdata_t) retadr[0]; /* starting virtual address */ + /* + * Use the size of the file up to the + * EOF mark for UNIX compatibility. + */ + *psize = (toff_t) size; + /* Record the section in the table */ + map_table[no_mapped].base = retadr[0]; + map_table[no_mapped].top = retadr[1]; + map_table[no_mapped].channel = channel; + no_mapped++; + + return(1); +} + +/* + * This routine unmaps a section from the virtual address space of + * the process, but only if the base was the one returned from a + * call to TIFFMapFileContents. + */ +static void +_tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size) +{ + char *inadr[2]; + int i, j; + + /* Find the section in the table */ + for (i = 0;i < no_mapped; i++) { + if (map_table[i].base == (char *) base) { + /* Unmap the section */ + inadr[0] = (char *) base; + inadr[1] = map_table[i].top; + sys$deltva(inadr, 0, 0); + sys$dassgn(map_table[i].channel); + /* Remove this section from the list */ + for (j = i+1; j < no_mapped; j++) + map_table[j-1] = map_table[j]; + no_mapped--; + return; + } + } +} +#else /* !HAVE_MMAP */ +static int +_tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize) +{ + return (0); +} + +static void +_tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size) +{ +} +#endif /* !HAVE_MMAP */ + +/* + * Open a TIFF file descriptor for read/writing. + */ +TIFF* +TIFFFdOpen(int fd, const char* name, const char* mode) +{ + TIFF* tif; + + tif = TIFFClientOpen(name, mode, + (thandle_t) fd, + _tiffReadProc, _tiffWriteProc, _tiffSeekProc, _tiffCloseProc, + _tiffSizeProc, _tiffMapProc, _tiffUnmapProc); + if (tif) + tif->tif_fd = fd; + return (tif); +} + +/* + * Open a TIFF file for read/writing. + */ +TIFF* +TIFFOpen(const char* name, const char* mode) +{ + static const char module[] = "TIFFOpen"; + int m, fd; + + m = _TIFFgetMode(mode, module); + if (m == -1) + return ((TIFF*)0); + if (m&O_TRUNC){ + /* + * There is a bug in open in VAXC. If you use + * open w/ m=O_RDWR|O_CREAT|O_TRUNC the + * wrong thing happens. On the other hand + * creat does the right thing. + */ + fd = creat((char *) /* bug in stdio.h */ name, 0666, + "alq = 128", "deq = 64", "mbc = 32", + "fop = tef"); + } else if (m&O_RDWR) { + fd = open(name, m, 0666, + "deq = 64", "mbc = 32", "fop = tef", "ctx = stm"); + } else + fd = open(name, m, 0666, "mbc = 32", "ctx = stm"); + if (fd < 0) { + TIFFError(module, "%s: Cannot open", name); + return ((TIFF*)0); + } + return (TIFFFdOpen(fd, name, mode)); +} + +tdata_t +_TIFFmalloc(tsize_t s) +{ + return (malloc((size_t) s)); +} + +void +_TIFFfree(tdata_t p) +{ + free(p); +} + +tdata_t +_TIFFrealloc(tdata_t p, tsize_t s) +{ + return (realloc(p, (size_t) s)); +} + +void +_TIFFmemset(tdata_t p, int v, tsize_t c) +{ + memset(p, v, (size_t) c); +} + +void +_TIFFmemcpy(tdata_t d, const tdata_t s, tsize_t c) +{ + memcpy(d, s, (size_t) c); +} + +int +_TIFFmemcmp(const tdata_t p1, const tdata_t p2, tsize_t c) +{ + return (memcmp(p1, p2, (size_t) c)); +} + +/* + * On the VAX, we need to make those global, writable pointers + * non-shareable, otherwise they would be made shareable by default. + * On the AXP, this brain damage has been corrected. + * + * I (Karsten Spang, krs@kampsax.dk) have dug around in the GCC + * manual and the GAS code and have come up with the following + * construct, but I don't have GCC on my VAX, so it is untested. + * Please tell me if it does not work. + */ + +static void +vmsWarningHandler(const char* module, const char* fmt, va_list ap) +{ + if (module != NULL) + fprintf(stderr, "%s: ", module); + fprintf(stderr, "Warning, "); + vfprintf(stderr, fmt, ap); + fprintf(stderr, ".\n"); +} + +NOSHARE TIFFErrorHandler _TIFFwarningHandler = vmsWarningHandler +#if defined(VAX) && defined(__GNUC__) +asm("_$$PsectAttributes_NOSHR$$_TIFFwarningHandler") +#endif +; + +static void +vmsErrorHandler(const char* module, const char* fmt, va_list ap) +{ + if (module != NULL) + fprintf(stderr, "%s: ", module); + vfprintf(stderr, fmt, ap); + fprintf(stderr, ".\n"); +} + +NOSHARE TIFFErrorHandler _TIFFerrorHandler = vmsErrorHandler +#if defined(VAX) && defined(__GNUC__) +asm("_$$PsectAttributes_NOSHR$$_TIFFerrorHandler") +#endif +; + + +#if !HAVE_IEEEFP +/* IEEE floting point handling */ + +typedef struct ieeedouble { + u_long mant2; /* fix NDR: full 8-byte swap */ + u_long mant : 20, + exp : 11, + sign : 1; +} ieeedouble; +typedef struct ieeefloat { + u_long mant : 23, + exp : 8, + sign : 1; +} ieeefloat; + +/* + * NB: These are D_FLOAT's, not G_FLOAT's. A G_FLOAT is + * simply a reverse-IEEE float/double. + */ + +typedef struct { + u_long mant1 : 7, + exp : 8, + sign : 1, + mant2 : 16, + mant3 : 16, + mant4 : 16; +} nativedouble; +typedef struct { + u_long mant1 : 7, + exp : 8, + sign : 1, + mant2 : 16; +} nativefloat; + +typedef union { + ieeedouble ieee; + nativedouble native; + char b[8]; + uint32 l[2]; + double d; +} double_t; + +typedef union { + ieeefloat ieee; + nativefloat native; + char b[4]; + uint32 l; + float f; +} float_t; + +#if defined(VAXC) || defined(DECC) +#pragma inline(ieeetod,dtoieee) +#endif + +/* + * Convert an IEEE double precision number to native double precision. + * The source is contained in two longwords, the second holding the sign, + * exponent and the higher order bits of the mantissa, and the first + * holding the rest of the mantissa as follows: + * (Note: It is assumed that the number has been eight-byte swapped to + * LSB first.) + * + * First longword: + * 32 least significant bits of mantissa + * Second longword: + * 0-19: 20 most significant bits of mantissa + * 20-30: exponent + * 31: sign + * The exponent is stored as excess 1023. + * The most significant bit of the mantissa is implied 1, and not stored. + * If the exponent and mantissa are zero, the number is zero. + * If the exponent is 0 (i.e. -1023) and the mantissa is non-zero, it is an + * unnormalized number with the most significant bit NOT implied. + * If the exponent is 2047, the number is invalid, in case the mantissa is zero, + * this means overflow (+/- depending of the sign bit), otherwise + * it simply means invalid number. + * + * If the number is too large for the machine or was specified as overflow, + * +/-HUGE_VAL is returned. + */ +INLINE static void +ieeetod(double *dp) +{ + double_t source; + long sign,exp,mant; + double dmant; + + source.ieee = ((double_t*)dp)->ieee; + sign = source.ieee.sign; + exp = source.ieee.exp; + mant = source.ieee.mant; + + if (exp == 2047) { + if (mant) /* Not a Number (NAN) */ + *dp = HUGE_VAL; + else /* +/- infinity */ + *dp = (sign ? -HUGE_VAL : HUGE_VAL); + return; + } + if (!exp) { + if (!(mant || source.ieee.mant2)) { /* zero */ + *dp=0; + return; + } else { /* Unnormalized number */ + /* NB: not -1023, the 1 bit is not implied */ + exp= -1022; + } + } else { + mant |= 1<<20; + exp -= 1023; + } + dmant = (((double) mant) + + ((double) source.ieee.mant2) / (((double) (1<<16)) * + ((double) (1<<16)))) / (double) (1<<20); + dmant = ldexp(dmant, exp); + if (sign) + dmant= -dmant; + *dp = dmant; +} + +INLINE static void +dtoieee(double *dp) +{ + double_t num; + double x; + int exp; + + num.d = *dp; + if (!num.d) { /* Zero is just binary all zeros */ + num.l[0] = num.l[1] = 0; + return; + } + + if (num.d < 0) { /* Sign is encoded separately */ + num.d = -num.d; + num.ieee.sign = 1; + } else { + num.ieee.sign = 0; + } + + /* Now separate the absolute value into mantissa and exponent */ + x = frexp(num.d, &exp); + + /* + * Handle cases where the value is outside the + * range for IEEE floating point numbers. + * (Overflow cannot happen on a VAX, but underflow + * can happen for G float.) + */ + if (exp < -1022) { /* Unnormalized number */ + x = ldexp(x, -1023-exp); + exp = 0; + } else if (exp > 1023) { /* +/- infinity */ + x = 0; + exp = 2047; + } else { /* Get rid of most significant bit */ + x *= 2; + x -= 1; + exp += 1022; /* fix NDR: 1.0 -> x=0.5, exp=1 -> ieee.exp = 1023 */ + } + num.ieee.exp = exp; + + x *= (double) (1<<20); + num.ieee.mant = (long) x; + x -= (double) num.ieee.mant; + num.ieee.mant2 = (long) (x*((double) (1<<16)*(double) (1<<16))); + + if (!(num.ieee.mant || num.ieee.exp || num.ieee.mant2)) { + /* Avoid negative zero */ + num.ieee.sign = 0; + } + ((double_t*)dp)->ieee = num.ieee; +} + +/* + * Beware, these do not handle over/under-flow + * during conversion from ieee to native format. + */ +#define NATIVE2IEEEFLOAT(fp) { \ + float_t t; \ + if (t.ieee.exp = (fp)->native.exp) \ + t.ieee.exp += -129 + 127; \ + t.ieee.sign = (fp)->native.sign; \ + t.ieee.mant = ((fp)->native.mant1<<16)|(fp)->native.mant2; \ + *(fp) = t; \ +} +#define IEEEFLOAT2NATIVE(fp) { \ + float_t t; int v = (fp)->ieee.exp; \ + if (v) v += -127 + 129; /* alter bias of exponent */\ + t.native.exp = v; /* implicit truncation of exponent */\ + t.native.sign = (fp)->ieee.sign; \ + v = (fp)->ieee.mant; \ + t.native.mant1 = v >> 16; \ + t.native.mant2 = v;\ + *(fp) = t; \ +} + +#define IEEEDOUBLE2NATIVE(dp) ieeetod(dp) + +#define NATIVE2IEEEDOUBLE(dp) dtoieee(dp) + + +/* + * These unions are used during floating point + * conversions. The above macros define the + * conversion operations. + */ +void +TIFFCvtIEEEFloatToNative(TIFF* tif, u_int n, float* f) +{ + float_t* fp = (float_t*) f; + + while (n-- > 0) { + IEEEFLOAT2NATIVE(fp); + fp++; + } +} + +void +TIFFCvtNativeToIEEEFloat(TIFF* tif, u_int n, float* f) +{ + float_t* fp = (float_t*) f; + + while (n-- > 0) { + NATIVE2IEEEFLOAT(fp); + fp++; + } +} +void +TIFFCvtIEEEDoubleToNative(TIFF* tif, u_int n, double* f) +{ + double_t* fp = (double_t*) f; + + while (n-- > 0) { + IEEEDOUBLE2NATIVE(fp); + fp++; + } +} + +void +TIFFCvtNativeToIEEEDouble(TIFF* tif, u_int n, double* f) +{ + double_t* fp = (double_t*) f; + + while (n-- > 0) { + NATIVE2IEEEDOUBLE(fp); + fp++; + } +} +#endif |