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Add zstrerror for ZLIB errors.

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Michael R Sweet 2021-08-25 09:30:03 -04:00
parent 6d42b6834e
commit e83fdf14dd
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GPG Key ID: BE67C75EC81F3244
1 changed files with 59 additions and 9 deletions
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68
pdfio-stream.c
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@ -21,6 +21,7 @@
static unsigned char stream_paeth(unsigned char a, unsigned char b, unsigned char c);
static ssize_t stream_read(pdfio_stream_t *st, char *buffer, size_t bytes);
static bool stream_write(pdfio_stream_t *st, const void *buffer, size_t bytes);
static const char *zstrerror(int error);
//
@ -55,7 +56,7 @@ pdfioStreamClose(pdfio_stream_t *st) // I - Stream
{
if (status < Z_OK && status != Z_BUF_ERROR)
{
_pdfioFileError(st->pdf, "Flate compression failed (%d)", status);
_pdfioFileError(st->pdf, "Flate compression failed: %s", zstrerror(status));
ret = false;
goto done;
}
@ -165,6 +166,7 @@ _pdfioStreamCreate(
// Number of columns
int predictor = (int)pdfioDictGetNumber(params, "Predictor");
// Predictory value, if any
int status; // ZLIB status code
PDFIO_DEBUG("_pdfioStreamCreate: FlateDecode - BitsPerComponent=%d, Colors=%d, Columns=%d, Predictor=%d\n", bpc, colors, columns, predictor);
@ -231,9 +233,9 @@ _pdfioStreamCreate(
st->flate.next_out = (Bytef *)st->cbuffer;
st->flate.avail_out = (uInt)sizeof(st->cbuffer);
if (deflateInit(&(st->flate), 9) != Z_OK)
if ((status = deflateInit(&(st->flate), 9)) != Z_OK)
{
_pdfioFileError(st->pdf, "Unable to start Flate filter.");
_pdfioFileError(st->pdf, "Unable to start Flate filter: %s", zstrerror(status));
free(st->prbuffer);
free(st->psbuffer);
free(st);
@ -382,6 +384,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj, // I - Object
// Number of columns
int predictor = (int)pdfioDictGetNumber(params, "Predictor");
// Predictory value, if any
int status; // ZLIB status
PDFIO_DEBUG("_pdfioStreamOpen: FlateDecode - BitsPerComponent=%d, Colors=%d, Columns=%d, Predictor=%d\n", bpc, colors, columns, predictor);
@ -452,9 +455,9 @@ _pdfioStreamOpen(pdfio_obj_t *obj, // I - Object
PDFIO_DEBUG("_pdfioStreamOpen: avail_in=%u, cbuffer=<%02X%02X%02X%02X%02X%02X%02X%02X...>\n", st->flate.avail_in, st->cbuffer[0], st->cbuffer[1], st->cbuffer[2], st->cbuffer[3], st->cbuffer[4], st->cbuffer[5], st->cbuffer[6], st->cbuffer[7]);
if (inflateInit(&(st->flate)) != Z_OK)
if ((status = inflateInit(&(st->flate))) != Z_OK)
{
_pdfioFileError(st->pdf, "Unable to start Flate filter.");
_pdfioFileError(st->pdf, "Unable to start Flate filter: %s", zstrerror(status));
free(st->prbuffer);
free(st->psbuffer);
free(st);
@ -864,7 +867,7 @@ stream_read(pdfio_stream_t *st, // I - Stream
if ((status = inflate(&(st->flate), Z_NO_FLUSH)) < Z_OK)
{
_pdfioFileError(st->pdf, "Unable to decompress stream data: %d", status);
_pdfioFileError(st->pdf, "Unable to decompress stream data: %s", zstrerror(status));
return (-1);
}
@ -914,7 +917,7 @@ stream_read(pdfio_stream_t *st, // I - Stream
if ((status = inflate(&(st->flate), Z_NO_FLUSH)) < Z_OK)
{
_pdfioFileError(st->pdf, "Unable to decompress stream data: %d", status);
_pdfioFileError(st->pdf, "Unable to decompress stream data: %s", zstrerror(status));
return (-1);
}
else if (status == Z_STREAM_END)
@ -978,7 +981,7 @@ stream_read(pdfio_stream_t *st, // I - Stream
if ((status = inflate(&(st->flate), Z_NO_FLUSH)) < Z_OK)
{
_pdfioFileError(st->pdf, "Unable to decompress stream data: %d", status);
_pdfioFileError(st->pdf, "Unable to decompress stream data: %s", zstrerror(status));
return (-1);
}
else if (status == Z_STREAM_END)
@ -994,25 +997,30 @@ stream_read(pdfio_stream_t *st, // I - Stream
switch (sptr[-1])
{
case 0 : // None
case 10 : // None (for buggy PDF writers)
memcpy(buffer, sptr, remaining);
break;
case 1 : // Sub
case 11 : // Sub (for buggy PDF writers)
for (; bufptr < bufsecond; remaining --, sptr ++)
*bufptr++ = *sptr;
for (; remaining > 0; remaining --, sptr ++, bufptr ++)
*bufptr = *sptr + bufptr[-(int)pbpixel];
break;
case 2 : // Up
case 12 : // Up (for buggy PDF writers)
for (; remaining > 0; remaining --, sptr ++, pptr ++)
*bufptr++ = *sptr + *pptr;
break;
case 3 : // Average
case 13 : // Average (for buggy PDF writers)
for (; bufptr < bufsecond; remaining --, sptr ++, pptr ++)
*bufptr++ = *sptr + *pptr / 2;
for (; remaining > 0; remaining --, sptr ++, pptr ++, bufptr ++)
*bufptr = *sptr + (bufptr[-(int)pbpixel] + *pptr) / 2;
break;
case 4 : // Paeth
case 14 : // Paeth (for buggy PDF writers)
for (; bufptr < bufsecond; remaining --, sptr ++, pptr ++)
*bufptr++ = *sptr + stream_paeth(0, *pptr, 0);
for (; remaining > 0; remaining --, sptr ++, pptr ++, bufptr ++)
@ -1070,10 +1078,52 @@ stream_write(pdfio_stream_t *st, // I - Stream
if (status < Z_OK && status != Z_BUF_ERROR)
{
_pdfioFileError(st->pdf, "Flate compression failed (%d)", status);
_pdfioFileError(st->pdf, "Flate compression failed: %s", zstrerror(status));
return (false);
}
}
return (true);
}
//
// 'zstrerror()' - Return a string for a zlib error number.
//
static const char * // O - Error string
zstrerror(int error) // I - Error number
{
switch (error)
{
case Z_OK :
return ("No error.");
case Z_STREAM_END :
return ("End of stream.");
case Z_NEED_DICT :
return ("Need a huffman dictinary.");
case Z_ERRNO :
return (strerror(errno));
case Z_STREAM_ERROR :
return ("Stream error.");
case Z_DATA_ERROR :
return ("Data error.");
case Z_MEM_ERROR :
return ("Out of memory.");
case Z_BUF_ERROR :
return ("Out of buffers.");
case Z_VERSION_ERROR :
return ("Mismatched zlib library.");
default :
return ("Unknown error.");
}
}